feat: replace docker/libtrust with go-jose/go-jose

docker/libtrust repository has been archived for several years now.
This commit replaces all the libtrust JWT machinery with go-jose/go-jose module.
Some of the code has been adopted from libtrust and adjusted for some of
the use cases covered by the token authorization flow especially in the
tests.

Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>

docs/content/spec/auth/jwt.md

@@ -68,26 +68,6 @@ Token has 3 main parts:
     signing algorithm used to produce the signature. It also must have a "kid"
     field, representing the ID of the key which was used to sign the token.
 
-    The "kid" field has to be in a libtrust fingerprint compatible format.
-    Such a format can be generated by following steps:
-
-    1.  Take the DER encoded public key which the JWT token was signed against.
-
-    2.  Create a SHA256 hash out of it and truncate to 240bits.
-
-    3.  Split the result into 12 base32 encoded groups with `:` as delimiter.
-
-    Here is an example JOSE Header for a JSON Web Token (formatted with
-    whitespace for readability):
-
-    ```
-    {
-        "typ": "JWT",
-        "alg": "ES256",
-        "kid": "PYYO:TEWU:V7JH:26JV:AQTZ:LJC3:SXVJ:XGHA:34F2:2LAQ:ZRMK:Z7Q6"
-    }
-    ```
-
     It specifies that this object is going to be a JSON Web token signed using
     the key with the given ID using the Elliptic Curve signature algorithm
     using a SHA256 hash.

go.mod

@@ -14,7 +14,7 @@ require (
 	github.com/distribution/reference v0.5.0
 	github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c
 	github.com/docker/go-metrics v0.0.1
-	github.com/docker/libtrust v0.0.0-20150114040149-fa567046d9b1
+	github.com/go-jose/go-jose/v3 v3.0.0
 	github.com/gorilla/handlers v1.5.1
 	github.com/gorilla/mux v1.8.0
 	github.com/hashicorp/golang-lru/arc/v2 v2.0.5

go.sum

@@ -102,8 +102,6 @@ github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c h1:+pKlWGMw7gf6bQ
 github.com/docker/go-events v0.0.0-20190806004212-e31b211e4f1c/go.mod h1:Uw6UezgYA44ePAFQYUehOuCzmy5zmg/+nl2ZfMWGkpA=
 github.com/docker/go-metrics v0.0.1 h1:AgB/0SvBxihN0X8OR4SjsblXkbMvalQ8cjmtKQ2rQV8=
 github.com/docker/go-metrics v0.0.1/go.mod h1:cG1hvH2utMXtqgqqYE9plW6lDxS3/5ayHzueweSI3Vw=
-github.com/docker/libtrust v0.0.0-20150114040149-fa567046d9b1 h1:ZClxb8laGDf5arXfYcAtECDFgAgHklGI8CxgjHnXKJ4=
-github.com/docker/libtrust v0.0.0-20150114040149-fa567046d9b1/go.mod h1:cyGadeNEkKy96OOhEzfZl+yxihPEzKnqJwvfuSUqbZE=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -113,6 +111,8 @@ github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSw
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-jose/go-jose/v3 v3.0.0 h1:s6rrhirfEP/CGIoc6p+PZAeogN2SxKav6Wp7+dyMWVo=
+github.com/go-jose/go-jose/v3 v3.0.0/go.mod h1:RNkWWRld676jZEYoV3+XK8L2ZnNSvIsxFMht0mSX+u8=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
@@ -308,6 +308,7 @@ github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpE
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
@@ -335,6 +336,7 @@ golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=

registry/auth/token/accesscontroller.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto"
 	"crypto/x509"
+	"encoding/json"
 	"encoding/pem"
 	"errors"
 	"fmt"
@@ -14,7 +15,7 @@ import (
 
 	dcontext "github.com/distribution/distribution/v3/context"
 	"github.com/distribution/distribution/v3/registry/auth"
-	"github.com/docker/libtrust"
+	"github.com/go-jose/go-jose/v3"
 )
 
 // accessSet maps a typed, named resource to
@@ -132,7 +133,7 @@ type accessController struct {
 	issuer       string
 	service      string
 	rootCerts    *x509.CertPool
-	trustedKeys  map[string]libtrust.PublicKey
+	trustedKeys  map[string]crypto.PublicKey
 }
 
 // tokenAccessOptions is a convenience type for handling
@@ -143,6 +144,7 @@ type tokenAccessOptions struct {
 	issuer         string
 	service        string
 	rootCertBundle string
+	jwks           string
 }
 
 // checkOptions gathers the necessary options
@@ -150,17 +152,26 @@ type tokenAccessOptions struct {
 func checkOptions(options map[string]interface{}) (tokenAccessOptions, error) {
 	var opts tokenAccessOptions
 
-	keys := []string{"realm", "issuer", "service", "rootcertbundle"}
+	keys := []string{"realm", "issuer", "service", "rootcertbundle", "jwks"}
 	vals := make([]string, 0, len(keys))
 	for _, key := range keys {
 		val, ok := options[key].(string)
 		if !ok {
+			// NOTE(milosgajdos): this func makes me intensely sad
+			// just like all the other weakly typed config options.
+			// Either of these config options may be missing, but
+			// at least one must be present: we handle those cases
+			// in newAccessController func which consumes this one.
+			if key == "rootcertbundle" || key == "jwks" {
+				vals = append(vals, "")
+				continue
+			}
 			return opts, fmt.Errorf("token auth requires a valid option string: %q", key)
 		}
 		vals = append(vals, val)
 	}
 
-	opts.realm, opts.issuer, opts.service, opts.rootCertBundle = vals[0], vals[1], vals[2], vals[3]
+	opts.realm, opts.issuer, opts.service, opts.rootCertBundle, opts.jwks = vals[0], vals[1], vals[2], vals[3], vals[4]
 
 	autoRedirectVal, ok := options["autoredirect"]
 	if ok {
@@ -174,22 +185,16 @@ func checkOptions(options map[string]interface{}) (tokenAccessOptions, error) {
 	return opts, nil
 }
 
-// newAccessController creates an accessController using the given options.
+func getRootCerts(path string) ([]*x509.Certificate, error) {
-func newAccessController(options map[string]interface{}) (auth.AccessController, error) {
+	fp, err := os.Open(path)
-	config, err := checkOptions(options)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("unable to open token auth root certificate bundle file %q: %s", path, err)
-	}
-
-	fp, err := os.Open(config.rootCertBundle)
-	if err != nil {
-		return nil, fmt.Errorf("unable to open token auth root certificate bundle file %q: %s", config.rootCertBundle, err)
 	}
 	defer fp.Close()
 
 	rawCertBundle, err := io.ReadAll(fp)
 	if err != nil {
-		return nil, fmt.Errorf("unable to read token auth root certificate bundle file %q: %s", config.rootCertBundle, err)
+		return nil, fmt.Errorf("unable to read token auth root certificate bundle file %q: %s", path, err)
 	}
 
 	var rootCerts []*x509.Certificate
@@ -207,19 +212,72 @@ func newAccessController(options map[string]interface{}) (auth.AccessController,
 		pemBlock, rawCertBundle = pem.Decode(rawCertBundle)
 	}
 
-	if len(rootCerts) == 0 {
+	return rootCerts, nil
-		return nil, errors.New("token auth requires at least one token signing root certificate")
+}
+
+func getJwks(path string) (*jose.JSONWebKeySet, error) {
+	// TODO(milosgajdos): we should consider providing a JWKS
+	// URL from which the JWKS could be fetched
+	jp, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("unable to open jwks file %q: %s", path, err)
+	}
+	defer jp.Close()
+
+	rawJWKS, err := io.ReadAll(jp)
+	if err != nil {
+		return nil, fmt.Errorf("unable to read token jwks file %q: %s", path, err)
+	}
+
+	var jwks jose.JSONWebKeySet
+	if err := json.Unmarshal(rawJWKS, &jwks); err != nil {
+		return nil, fmt.Errorf("failed to parse jwks: %v", err)
+	}
+
+	return &jwks, nil
+}
+
+// newAccessController creates an accessController using the given options.
+func newAccessController(options map[string]interface{}) (auth.AccessController, error) {
+	config, err := checkOptions(options)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		rootCerts []*x509.Certificate
+		jwks      *jose.JSONWebKeySet
+	)
+
+	if config.rootCertBundle != "" {
+		rootCerts, err = getRootCerts(config.rootCertBundle)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if config.jwks != "" {
+		jwks, err = getJwks(config.jwks)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if (len(rootCerts) == 0 && jwks == nil) || // no certs bundle and no jwks
+		(len(rootCerts) == 0 && jwks != nil && len(jwks.Keys) == 0) { // no certs bundle and empty jwks
+		return nil, errors.New("token auth requires at least one token signing key")
 	}
 
 	rootPool := x509.NewCertPool()
-	trustedKeys := make(map[string]libtrust.PublicKey, len(rootCerts))
 	for _, rootCert := range rootCerts {
 		rootPool.AddCert(rootCert)
-		pubKey, err := libtrust.FromCryptoPublicKey(crypto.PublicKey(rootCert.PublicKey))
-		if err != nil {
-			return nil, fmt.Errorf("unable to get public key from token auth root certificate: %s", err)
 	}
-		trustedKeys[pubKey.KeyID()] = pubKey
+
+	trustedKeys := make(map[string]crypto.PublicKey)
+	if jwks != nil {
+		for _, key := range jwks.Keys {
+			trustedKeys[key.KeyID] = key.Public()
+		}
 	}
 
 	return &accessController{
@@ -266,12 +324,13 @@ func (ac *accessController) Authorized(ctx context.Context, accessItems ...auth.
 		TrustedKeys:       ac.trustedKeys,
 	}
 
-	if err = token.Verify(verifyOpts); err != nil {
+	claims, err := token.Verify(verifyOpts)
+	if err != nil {
 		challenge.err = err
 		return nil, challenge
 	}
 
-	accessSet := token.accessSet()
+	accessSet := claims.accessSet()
 	for _, access := range accessItems {
 		if !accessSet.contains(access) {
 			challenge.err = ErrInsufficientScope
@@ -279,9 +338,9 @@ func (ac *accessController) Authorized(ctx context.Context, accessItems ...auth.
 		}
 	}
 
-	ctx = auth.WithResources(ctx, token.resources())
+	ctx = auth.WithResources(ctx, claims.resources())
 
-	return auth.WithUser(ctx, auth.UserInfo{Name: token.Claims.Subject}), nil
+	return auth.WithUser(ctx, auth.UserInfo{Name: claims.Subject}), nil
 }
 
 // init handles registering the token auth backend.

registry/auth/token/token.go

@@ -3,14 +3,12 @@ package token
 import (
 	"crypto"
 	"crypto/x509"
-	"encoding/base64"
-	"encoding/json"
 	"errors"
 	"fmt"
-	"strings"
 	"time"
 
-	"github.com/docker/libtrust"
+	"github.com/go-jose/go-jose/v3"
+	"github.com/go-jose/go-jose/v3/jwt"
 	log "github.com/sirupsen/logrus"
 
 	"github.com/distribution/distribution/v3/registry/auth"
@@ -54,21 +52,10 @@ type ClaimSet struct {
 	Access []*ResourceActions `json:"access"`
 }
 
-// Header describes the header section of a JSON Web Token.
+// Token is a JSON Web Token.
-type Header struct {
-	Type       string           `json:"typ"`
-	SigningAlg string           `json:"alg"`
-	KeyID      string           `json:"kid,omitempty"`
-	X5c        []string         `json:"x5c,omitempty"`
-	RawJWK     *json.RawMessage `json:"jwk,omitempty"`
-}
-
-// Token describes a JSON Web Token.
 type Token struct {
 	Raw string
-	Header    *Header
+	JWT *jwt.JSONWebToken
-	Claims    *ClaimSet
-	Signature []byte
 }
 
 // VerifyOptions is used to specify
@@ -77,264 +64,178 @@ type VerifyOptions struct {
 	TrustedIssuers    []string
 	AcceptedAudiences []string
 	Roots             *x509.CertPool
-	TrustedKeys       map[string]libtrust.PublicKey
+	TrustedKeys       map[string]crypto.PublicKey
 }
 
 // NewToken parses the given raw token string
 // and constructs an unverified JSON Web Token.
 func NewToken(rawToken string) (*Token, error) {
-	// We expect 3 parts, but limit the split to 4 to detect cases where
+	token, err := jwt.ParseSigned(rawToken)
-	// the token contains too many (or too few) separators.
-	parts := strings.SplitN(rawToken, TokenSeparator, 4)
-	if len(parts) != 3 {
-		return nil, ErrMalformedToken
-	}
-
-	var (
-		rawHeader, rawClaims   = parts[0], parts[1]
-		headerJSON, claimsJSON []byte
-		err                    error
-	)
-
-	defer func() {
 	if err != nil {
-			log.Infof("error while unmarshalling raw token: %s", err)
-		}
-	}()
-
-	if headerJSON, err = joseBase64UrlDecode(rawHeader); err != nil {
-		err = fmt.Errorf("unable to decode header: %s", err)
 		return nil, ErrMalformedToken
 	}
 
-	if claimsJSON, err = joseBase64UrlDecode(rawClaims); err != nil {
+	return &Token{
-		err = fmt.Errorf("unable to decode claims: %s", err)
+		Raw: rawToken,
-		return nil, ErrMalformedToken
+		JWT: token,
-	}
+	}, nil
-
-	token := new(Token)
-	token.Header = new(Header)
-	token.Claims = new(ClaimSet)
-
-	token.Raw = strings.Join(parts[:2], TokenSeparator)
-	if token.Signature, err = joseBase64UrlDecode(parts[2]); err != nil {
-		err = fmt.Errorf("unable to decode signature: %s", err)
-		return nil, ErrMalformedToken
-	}
-
-	if err = json.Unmarshal(headerJSON, token.Header); err != nil {
-		return nil, ErrMalformedToken
-	}
-
-	if err = json.Unmarshal(claimsJSON, token.Claims); err != nil {
-		return nil, ErrMalformedToken
-	}
-
-	return token, nil
 }
 
 // Verify attempts to verify this token using the given options.
 // Returns a nil error if the token is valid.
-func (t *Token) Verify(verifyOpts VerifyOptions) error {
+func (t *Token) Verify(verifyOpts VerifyOptions) (*ClaimSet, error) {
+	// Verify that the signing key is trusted.
+	signingKey, err := t.VerifySigningKey(verifyOpts)
+	if err != nil {
+		log.Infof("failed to verify token: %v", err)
+		return nil, ErrInvalidToken
+	}
+
+	// NOTE(milosgajdos): Claims both verifies the signature
+	// and returns the claims within the payload
+	var claims ClaimSet
+	err = t.JWT.Claims(signingKey, &claims)
+	if err != nil {
+		return nil, err
+	}
+
 	// Verify that the Issuer claim is a trusted authority.
-	if !contains(verifyOpts.TrustedIssuers, t.Claims.Issuer) {
+	if !contains(verifyOpts.TrustedIssuers, claims.Issuer) {
-		log.Infof("token from untrusted issuer: %q", t.Claims.Issuer)
+		log.Infof("token from untrusted issuer: %q", claims.Issuer)
-		return ErrInvalidToken
+		return nil, ErrInvalidToken
 	}
 
 	// Verify that the Audience claim is allowed.
-	if !containsAny(verifyOpts.AcceptedAudiences, t.Claims.Audience) {
+	if !containsAny(verifyOpts.AcceptedAudiences, claims.Audience) {
-		log.Infof("token intended for another audience: %v", t.Claims.Audience)
+		log.Infof("token intended for another audience: %v", claims.Audience)
-		return ErrInvalidToken
+		return nil, ErrInvalidToken
 	}
 
 	// Verify that the token is currently usable and not expired.
 	currentTime := time.Now()
 
-	ExpWithLeeway := time.Unix(t.Claims.Expiration, 0).Add(Leeway)
+	ExpWithLeeway := time.Unix(claims.Expiration, 0).Add(Leeway)
 	if currentTime.After(ExpWithLeeway) {
 		log.Infof("token not to be used after %s - currently %s", ExpWithLeeway, currentTime)
-		return ErrInvalidToken
+		return nil, ErrInvalidToken
 	}
 
-	NotBeforeWithLeeway := time.Unix(t.Claims.NotBefore, 0).Add(-Leeway)
+	NotBeforeWithLeeway := time.Unix(claims.NotBefore, 0).Add(-Leeway)
 	if currentTime.Before(NotBeforeWithLeeway) {
 		log.Infof("token not to be used before %s - currently %s", NotBeforeWithLeeway, currentTime)
-		return ErrInvalidToken
+		return nil, ErrInvalidToken
 	}
 
-	// Verify the token signature.
+	return &claims, nil
-	if len(t.Signature) == 0 {
-		log.Info("token has no signature")
-		return ErrInvalidToken
 }
 
-	// Verify that the signing key is trusted.
+// VerifySigningKey attempts to verify and return the signing key which was used to sign the token.
-	signingKey, err := t.VerifySigningKey(verifyOpts)
+func (t *Token) VerifySigningKey(verifyOpts VerifyOptions) (signingKey crypto.PublicKey, err error) {
-	if err != nil {
+	if len(t.JWT.Headers) == 0 {
-		log.Info(err)
+		return nil, ErrInvalidToken
-		return ErrInvalidToken
 	}
 
-	// Finally, verify the signature of the token using the key which signed it.
+	// NOTE(milosgajdos): docker auth spec does not seem to
-	if err := signingKey.Verify(strings.NewReader(t.Raw), t.Header.SigningAlg, t.Signature); err != nil {
+	// support tokens signed by multiple signatures so we are
-		log.Infof("unable to verify token signature: %s", err)
+	// verifying the first one in the list only at the moment.
-		return ErrInvalidToken
+	header := t.JWT.Headers[0]
-	}
-
-	return nil
-}
-
-// VerifySigningKey attempts to get the key which was used to sign this token.
-// The token header should contain either of these 3 fields:
-//
-//	`x5c` - The x509 certificate chain for the signing key. Needs to be
-//	        verified.
-//	`jwk` - The JSON Web Key representation of the signing key.
-//	        May contain its own `x5c` field which needs to be verified.
-//	`kid` - The unique identifier for the key. This library interprets it
-//	        as a libtrust fingerprint. The key itself can be looked up in
-//	        the trustedKeys field of the given verify options.
-//
-// Each of these methods are tried in that order of preference until the
-// signing key is found or an error is returned.
-func (t *Token) VerifySigningKey(verifyOpts VerifyOptions) (signingKey libtrust.PublicKey, err error) {
-	// First attempt to get an x509 certificate chain from the header.
-	var (
-		x5c    = t.Header.X5c
-		rawJWK = t.Header.RawJWK
-		keyID  = t.Header.KeyID
-	)
 
 	switch {
-	case len(x5c) > 0:
+	case header.JSONWebKey != nil:
-		signingKey, err = parseAndVerifyCertChain(x5c, verifyOpts.Roots)
+		signingKey, err = verifyJWK(header, verifyOpts)
-	case rawJWK != nil:
+	case len(header.KeyID) > 0:
-		signingKey, err = parseAndVerifyRawJWK(rawJWK, verifyOpts)
+		signingKey = verifyOpts.TrustedKeys[header.KeyID]
-	case len(keyID) > 0:
-		signingKey = verifyOpts.TrustedKeys[keyID]
 		if signingKey == nil {
-			err = fmt.Errorf("token signed by untrusted key with ID: %q", keyID)
+			err = fmt.Errorf("token signed by untrusted key with ID: %q", header.KeyID)
 		}
 	default:
-		err = errors.New("unable to get token signing key")
+		signingKey, err = verifyCertChain(header, verifyOpts.Roots)
 	}
 
 	return
 }
 
-func parseAndVerifyCertChain(x5c []string, roots *x509.CertPool) (leafKey libtrust.PublicKey, err error) {
+func verifyCertChain(header jose.Header, roots *x509.CertPool) (signingKey crypto.PublicKey, err error) {
-	if len(x5c) == 0 {
-		return nil, errors.New("empty x509 certificate chain")
-	}
-
-	// Ensure the first element is encoded correctly.
-	leafCertDer, err := base64.StdEncoding.DecodeString(x5c[0])
-	if err != nil {
-		return nil, fmt.Errorf("unable to decode leaf certificate: %s", err)
-	}
-
-	// And that it is a valid x509 certificate.
-	leafCert, err := x509.ParseCertificate(leafCertDer)
-	if err != nil {
-		return nil, fmt.Errorf("unable to parse leaf certificate: %s", err)
-	}
-
-	// The rest of the certificate chain are intermediate certificates.
-	intermediates := x509.NewCertPool()
-	for i := 1; i < len(x5c); i++ {
-		intermediateCertDer, err := base64.StdEncoding.DecodeString(x5c[i])
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode intermediate certificate: %s", err)
-		}
-
-		intermediateCert, err := x509.ParseCertificate(intermediateCertDer)
-		if err != nil {
-			return nil, fmt.Errorf("unable to parse intermediate certificate: %s", err)
-		}
-
-		intermediates.AddCert(intermediateCert)
-	}
-
 	verifyOpts := x509.VerifyOptions{
-		Intermediates: intermediates,
 		Roots:     roots,
 		KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny},
 	}
 
 	// TODO: this call returns certificate chains which we ignore for now, but
 	// we should check them for revocations if we have the ability later.
-	if _, err = leafCert.Verify(verifyOpts); err != nil {
+	chains, err := header.Certificates(verifyOpts)
-		return nil, fmt.Errorf("unable to verify certificate chain: %s", err)
-	}
-
-	// Get the public key from the leaf certificate.
-	leafCryptoKey, ok := leafCert.PublicKey.(crypto.PublicKey)
-	if !ok {
-		return nil, errors.New("unable to get leaf cert public key value")
-	}
-
-	leafKey, err = libtrust.FromCryptoPublicKey(leafCryptoKey)
 	if err != nil {
-		return nil, fmt.Errorf("unable to make libtrust public key from leaf certificate: %s", err)
+		return nil, err
 	}
+	signingKey = getCertPubKey(chains)
 
 	return
 }
 
-func parseAndVerifyRawJWK(rawJWK *json.RawMessage, verifyOpts VerifyOptions) (pubKey libtrust.PublicKey, err error) {
+func verifyJWK(header jose.Header, verifyOpts VerifyOptions) (signingKey crypto.PublicKey, err error) {
-	pubKey, err = libtrust.UnmarshalPublicKeyJWK([]byte(*rawJWK))
+	jwk := header.JSONWebKey
-	if err != nil {
+	signingKey = jwk.Key
-		return nil, fmt.Errorf("unable to decode raw JWK value: %s", err)
-	}
 
 	// Check to see if the key includes a certificate chain.
-	x5cVal, ok := pubKey.GetExtendedField("x5c").([]interface{})
+	if len(jwk.Certificates) == 0 {
-	if !ok {
 		// The JWK should be one of the trusted root keys.
-		if _, trusted := verifyOpts.TrustedKeys[pubKey.KeyID()]; !trusted {
+		if _, trusted := verifyOpts.TrustedKeys[jwk.KeyID]; !trusted {
 			return nil, errors.New("untrusted JWK with no certificate chain")
 		}
-
 		// The JWK is one of the trusted keys.
 		return
 	}
 
-	// Ensure each item in the chain is of the correct type.
+	opts := x509.VerifyOptions{
-	x5c := make([]string, len(x5cVal))
+		Roots:     verifyOpts.Roots,
-	for i, val := range x5cVal {
+		KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny},
-		certString, ok := val.(string)
-		if !ok || len(certString) == 0 {
-			return nil, errors.New("malformed certificate chain")
-		}
-		x5c[i] = certString
 	}
 
-	// Ensure that the x509 certificate chain can
+	leaf := jwk.Certificates[0]
-	// be verified up to one of our trusted roots.
+	if opts.Intermediates == nil {
-	leafKey, err := parseAndVerifyCertChain(x5c, verifyOpts.Roots)
+		opts.Intermediates = x509.NewCertPool()
+		for _, intermediate := range jwk.Certificates[1:] {
+			opts.Intermediates.AddCert(intermediate)
+		}
+	}
+
+	// TODO: this call returns certificate chains which we ignore for now, but
+	// we should check them for revocations if we have the ability later.
+	chains, err := leaf.Verify(opts)
 	if err != nil {
-		return nil, fmt.Errorf("could not verify JWK certificate chain: %s", err)
+		return nil, err
-	}
-
-	// Verify that the public key in the leaf cert *is* the signing key.
-	if pubKey.KeyID() != leafKey.KeyID() {
-		return nil, errors.New("leaf certificate public key ID does not match JWK key ID")
 	}
+	signingKey = getCertPubKey(chains)
 
 	return
 }
 
-// accessSet returns a set of actions available for the resource
+func getCertPubKey(chains [][]*x509.Certificate) crypto.PublicKey {
-// actions listed in the `access` section of this token.
+	// NOTE(milosgajdos): if there are no certificates
-func (t *Token) accessSet() accessSet {
+	// header.Certificates call above returns error, so we are
-	if t.Claims == nil {
+	// guaranteed to get at least one certificate chain.
-		return nil
+	// We pick the leaf certificate chain.
+	chain := chains[0]
+
+	// NOTE(milosgajdos): header.Certificates call returns the result
+	// of leafCert.Verify which is a call to x509.Certificate.Verify.
+	// If successful, it returns one or more chains where the first
+	// element of the chain is x5c and the last element is from opts.Roots.
+	// See: https://pkg.go.dev/crypto/x509#Certificate.Verify
+	cert := chain[0]
+
+	// NOTE: we dont have to verify that the public key in the leaf cert
+	// *is* the signing key: if it's not the signing then token claims
+	// verifcation with this key fails
+	return cert.PublicKey.(crypto.PublicKey)
 }
 
-	accessSet := make(accessSet, len(t.Claims.Access))
+// accessSet returns a set of actions available for the resource
+// actions listed in the `access` section of this token.
+func (c *ClaimSet) accessSet() accessSet {
+	accessSet := make(accessSet, len(c.Access))
 
-	for _, resourceActions := range t.Claims.Access {
+	for _, resourceActions := range c.Access {
 		resource := auth.Resource{
 			Type: resourceActions.Type,
 			Name: resourceActions.Name,
@@ -354,13 +255,10 @@ func (t *Token) accessSet() accessSet {
 	return accessSet
 }
 
-func (t *Token) resources() []auth.Resource {
+func (c *ClaimSet) resources() []auth.Resource {
-	if t.Claims == nil {
-		return nil
-	}
-
 	resourceSet := map[auth.Resource]struct{}{}
-	for _, resourceActions := range t.Claims.Access {
+
+	for _, resourceActions := range c.Access {
 		resource := auth.Resource{
 			Type:  resourceActions.Type,
 			Class: resourceActions.Class,
@@ -376,7 +274,3 @@ func (t *Token) resources() []auth.Resource {
 
 	return resources
 }
-
-func (t *Token) compactRaw() string {
-	return fmt.Sprintf("%s.%s", t.Raw, joseBase64UrlEncode(t.Signature))
-}

registry/auth/token/token_test.go

@@ -2,110 +2,110 @@ package token
 
 import (
 	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/x509"
+	"crypto/x509/pkix"
 	"encoding/base64"
 	"encoding/json"
 	"encoding/pem"
 	"fmt"
+	"math/big"
+	"net"
 	"net/http"
 	"os"
-	"strings"
 	"testing"
 	"time"
 
 	"github.com/distribution/distribution/v3/context"
 	"github.com/distribution/distribution/v3/registry/auth"
-	"github.com/docker/libtrust"
+	"github.com/go-jose/go-jose/v3"
+	"github.com/go-jose/go-jose/v3/jwt"
 )
 
-func makeRootKeys(numKeys int) ([]libtrust.PrivateKey, error) {
+func makeRootKeys(numKeys int) ([]*ecdsa.PrivateKey, error) {
-	keys := make([]libtrust.PrivateKey, 0, numKeys)
+	rootKeys := make([]*ecdsa.PrivateKey, 0, numKeys)
 
 	for i := 0; i < numKeys; i++ {
-		key, err := libtrust.GenerateECP256PrivateKey()
+		pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 		if err != nil {
 			return nil, err
 		}
-		keys = append(keys, key)
+		rootKeys = append(rootKeys, pk)
 	}
 
-	return keys, nil
+	return rootKeys, nil
 }
 
-func makeSigningKeyWithChain(rootKey libtrust.PrivateKey, depth int) (libtrust.PrivateKey, error) {
+func makeRootCerts(rootKeys []*ecdsa.PrivateKey) ([]*x509.Certificate, error) {
+	rootCerts := make([]*x509.Certificate, 0, len(rootKeys))
+
+	for _, rootKey := range rootKeys {
+		cert, err := generateCACert(rootKey, rootKey)
+		if err != nil {
+			return nil, err
+		}
+		rootCerts = append(rootCerts, cert)
+	}
+
+	return rootCerts, nil
+}
+
+func makeSigningKeyWithChain(rootKey *ecdsa.PrivateKey, depth int) (*jose.JSONWebKey, error) {
 	if depth == 0 {
 		// Don't need to build a chain.
-		return rootKey, nil
+		return &jose.JSONWebKey{
+			Key:       rootKey,
+			KeyID:     rootKey.X.String(),
+			Algorithm: string(jose.ES256),
+		}, nil
 	}
 
 	var (
-		x5c       = make([]string, depth)
+		certs     = make([]*x509.Certificate, depth)
 		parentKey = rootKey
-		key       libtrust.PrivateKey
+
+		pk   *ecdsa.PrivateKey
 		cert *x509.Certificate
 		err  error
 	)
 
 	for depth > 0 {
-		if key, err = libtrust.GenerateECP256PrivateKey(); err != nil {
+		if pk, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader); err != nil {
 			return nil, err
 		}
 
-		if cert, err = libtrust.GenerateCACert(parentKey, key); err != nil {
+		if cert, err = generateCACert(parentKey, pk); err != nil {
 			return nil, err
 		}
 
 		depth--
-		x5c[depth] = base64.StdEncoding.EncodeToString(cert.Raw)
+		certs[depth] = cert
-		parentKey = key
+		parentKey = pk
 	}
 
-	key.AddExtendedField("x5c", x5c)
+	return &jose.JSONWebKey{
-
+		Key:          parentKey,
-	return key, nil
+		KeyID:        rootKey.X.String(),
+		Algorithm:    string(jose.ES256),
+		Certificates: certs,
+	}, nil
 }
 
-func makeRootCerts(rootKeys []libtrust.PrivateKey) ([]*x509.Certificate, error) {
+func makeTestToken(jwk *jose.JSONWebKey, issuer, audience string, access []*ResourceActions, now time.Time, exp time.Time) (*Token, error) {
-	certs := make([]*x509.Certificate, 0, len(rootKeys))
+	signingKey := jose.SigningKey{
+		Algorithm: jose.ES256,
+		Key:       jwk,
+	}
+	signerOpts := jose.SignerOptions{
+		EmbedJWK: true,
+	}
+	signerOpts.WithType("JWT")
 
-	for _, key := range rootKeys {
+	signer, err := jose.NewSigner(signingKey, &signerOpts)
-		cert, err := libtrust.GenerateCACert(key, key)
 	if err != nil {
-			return nil, err
+		return nil, fmt.Errorf("unable to create a signer: %s", err)
-		}
-		certs = append(certs, cert)
-	}
-
-	return certs, nil
-}
-
-func makeTrustedKeyMap(rootKeys []libtrust.PrivateKey) map[string]libtrust.PublicKey {
-	trustedKeys := make(map[string]libtrust.PublicKey, len(rootKeys))
-
-	for _, key := range rootKeys {
-		trustedKeys[key.KeyID()] = key.PublicKey()
-	}
-
-	return trustedKeys
-}
-
-func makeTestToken(issuer, audience string, access []*ResourceActions, rootKey libtrust.PrivateKey, depth int, now time.Time, exp time.Time) (*Token, error) {
-	signingKey, err := makeSigningKeyWithChain(rootKey, depth)
-	if err != nil {
-		return nil, fmt.Errorf("unable to make signing key with chain: %s", err)
-	}
-
-	var rawJWK json.RawMessage
-	rawJWK, err = signingKey.PublicKey().MarshalJSON()
-	if err != nil {
-		return nil, fmt.Errorf("unable to marshal signing key to JSON: %s", err)
-	}
-
-	joseHeader := &Header{
-		Type:       "JWT",
-		SigningAlg: "ES256",
-		RawJWK:     &rawJWK,
 	}
 
 	randomBytes := make([]byte, 15)
@@ -124,30 +124,99 @@ func makeTestToken(issuer, audience string, access []*ResourceActions, rootKey l
 		Access:     access,
 	}
 
-	var joseHeaderBytes, claimSetBytes []byte
+	tokenString, err := jwt.Signed(signer).Claims(claimSet).CompactSerialize()
-
+	if err != nil {
-	if joseHeaderBytes, err = json.Marshal(joseHeader); err != nil {
+		return nil, fmt.Errorf("unable to build token string: %v", err)
-		return nil, fmt.Errorf("unable to marshal jose header: %s", err)
 	}
-	if claimSetBytes, err = json.Marshal(claimSet); err != nil {
-		return nil, fmt.Errorf("unable to marshal claim set: %s", err)
-	}
-
-	encodedJoseHeader := joseBase64UrlEncode(joseHeaderBytes)
-	encodedClaimSet := joseBase64UrlEncode(claimSetBytes)
-	encodingToSign := fmt.Sprintf("%s.%s", encodedJoseHeader, encodedClaimSet)
-
-	var signatureBytes []byte
-	if signatureBytes, _, err = signingKey.Sign(strings.NewReader(encodingToSign), crypto.SHA256); err != nil {
-		return nil, fmt.Errorf("unable to sign jwt payload: %s", err)
-	}
-
-	signature := joseBase64UrlEncode(signatureBytes)
-	tokenString := fmt.Sprintf("%s.%s", encodingToSign, signature)
 
 	return NewToken(tokenString)
 }
 
+// NOTE(milosgajdos): certTemplateInfo type as well
+// as some of the functions in this file have been
+// adopted from https://github.com/docker/libtrust
+// and modiified to fit the purpose of the token package.
+
+type certTemplateInfo struct {
+	commonName  string
+	domains     []string
+	ipAddresses []net.IP
+	isCA        bool
+	clientAuth  bool
+	serverAuth  bool
+}
+
+func generateCertTemplate(info *certTemplateInfo) *x509.Certificate {
+	// Generate a certificate template which is valid from the past week to
+	// 10 years from now. The usage of the certificate depends on the
+	// specified fields in the given certTempInfo object.
+	var (
+		keyUsage    x509.KeyUsage
+		extKeyUsage []x509.ExtKeyUsage
+	)
+
+	if info.isCA {
+		keyUsage = x509.KeyUsageCertSign
+	}
+
+	if info.clientAuth {
+		extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageClientAuth)
+	}
+
+	if info.serverAuth {
+		extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageServerAuth)
+	}
+
+	return &x509.Certificate{
+		SerialNumber: big.NewInt(0),
+		Subject: pkix.Name{
+			CommonName: info.commonName,
+		},
+		NotBefore:             time.Now().Add(-time.Hour * 24 * 7),
+		NotAfter:              time.Now().Add(time.Hour * 24 * 365 * 10),
+		DNSNames:              info.domains,
+		IPAddresses:           info.ipAddresses,
+		IsCA:                  info.isCA,
+		KeyUsage:              keyUsage,
+		ExtKeyUsage:           extKeyUsage,
+		BasicConstraintsValid: info.isCA,
+	}
+}
+
+func generateCert(priv crypto.PrivateKey, pub crypto.PublicKey, subInfo, issInfo *certTemplateInfo) (*x509.Certificate, error) {
+	pubCertTemplate := generateCertTemplate(subInfo)
+	privCertTemplate := generateCertTemplate(issInfo)
+
+	certDER, err := x509.CreateCertificate(
+		rand.Reader, pubCertTemplate, privCertTemplate,
+		pub, priv,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create certificate: %s", err)
+	}
+
+	cert, err := x509.ParseCertificate(certDER)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse certificate: %s", err)
+	}
+
+	return cert, nil
+}
+
+// generateCACert creates a certificate which can be used as a trusted
+// certificate authority.
+func generateCACert(signer *ecdsa.PrivateKey, trustedKey *ecdsa.PrivateKey) (*x509.Certificate, error) {
+	subjectInfo := &certTemplateInfo{
+		commonName: trustedKey.X.String(),
+		isCA:       true,
+	}
+	issuerInfo := &certTemplateInfo{
+		commonName: signer.X.String(),
+	}
+
+	return generateCert(signer, trustedKey.Public(), subjectInfo, issuerInfo)
+}
+
 // This test makes 4 tokens with a varying number of intermediate
 // certificates ranging from no intermediate chain to a length of 3
 // intermediates.
@@ -180,12 +249,17 @@ func TestTokenVerify(t *testing.T) {
 		rootPool.AddCert(rootCert)
 	}
 
-	trustedKeys := makeTrustedKeyMap(rootKeys)
-
 	tokens := make([]*Token, 0, numTokens)
+	trustedKeys := map[string]crypto.PublicKey{}
 
 	for i := 0; i < numTokens; i++ {
-		token, err := makeTestToken(issuer, audience, access, rootKeys[i], i, time.Now(), time.Now().Add(5*time.Minute))
+		jwk, err := makeSigningKeyWithChain(rootKeys[i], i)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// add to trusted keys
+		trustedKeys[jwk.KeyID] = jwk.Public()
+		token, err := makeTestToken(jwk, issuer, audience, access, time.Now(), time.Now().Add(5*time.Minute))
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -200,7 +274,7 @@ func TestTokenVerify(t *testing.T) {
 	}
 
 	for _, token := range tokens {
-		if err := token.Verify(verifyOps); err != nil {
+		if _, err := token.Verify(verifyOps); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -226,7 +300,14 @@ func TestLeeway(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	trustedKeys := makeTrustedKeyMap(rootKeys)
+	jwk, err := makeSigningKeyWithChain(rootKeys[0], 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	trustedKeys := map[string]crypto.PublicKey{
+		jwk.KeyID: jwk.Public(),
+	}
 
 	verifyOps := VerifyOptions{
 		TrustedIssuers:    []string{issuer},
@@ -237,48 +318,48 @@ func TestLeeway(t *testing.T) {
 
 	// nbf verification should pass within leeway
 	futureNow := time.Now().Add(time.Duration(5) * time.Second)
-	token, err := makeTestToken(issuer, audience, access, rootKeys[0], 0, futureNow, futureNow.Add(5*time.Minute))
+	token, err := makeTestToken(jwk, issuer, audience, access, futureNow, futureNow.Add(5*time.Minute))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if err := token.Verify(verifyOps); err != nil {
+	if _, err := token.Verify(verifyOps); err != nil {
 		t.Fatal(err)
 	}
 
 	// nbf verification should fail with a skew larger than leeway
 	futureNow = time.Now().Add(time.Duration(61) * time.Second)
-	token, err = makeTestToken(issuer, audience, access, rootKeys[0], 0, futureNow, futureNow.Add(5*time.Minute))
+	token, err = makeTestToken(jwk, issuer, audience, access, futureNow, futureNow.Add(5*time.Minute))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if err = token.Verify(verifyOps); err == nil {
+	if _, err = token.Verify(verifyOps); err == nil {
 		t.Fatal("Verification should fail for token with nbf in the future outside leeway")
 	}
 
 	// exp verification should pass within leeway
-	token, err = makeTestToken(issuer, audience, access, rootKeys[0], 0, time.Now(), time.Now().Add(-59*time.Second))
+	token, err = makeTestToken(jwk, issuer, audience, access, time.Now(), time.Now().Add(-59*time.Second))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if err = token.Verify(verifyOps); err != nil {
+	if _, err = token.Verify(verifyOps); err != nil {
 		t.Fatal(err)
 	}
 
 	// exp verification should fail with a skew larger than leeway
-	token, err = makeTestToken(issuer, audience, access, rootKeys[0], 0, time.Now(), time.Now().Add(-60*time.Second))
+	token, err = makeTestToken(jwk, issuer, audience, access, time.Now(), time.Now().Add(-60*time.Second))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if err = token.Verify(verifyOps); err == nil {
+	if _, err = token.Verify(verifyOps); err == nil {
 		t.Fatal("Verification should fail for token with exp in the future outside leeway")
 	}
 }
 
-func writeTempRootCerts(rootKeys []libtrust.PrivateKey) (filename string, err error) {
+func writeTempRootCerts(rootKeys []*ecdsa.PrivateKey) (filename string, err error) {
 	rootCerts, err := makeRootCerts(rootKeys)
 	if err != nil {
 		return "", err
@@ -303,6 +384,31 @@ func writeTempRootCerts(rootKeys []libtrust.PrivateKey) (filename string, err er
 	return tempFile.Name(), nil
 }
 
+func writeTempJWKS(rootKeys []*ecdsa.PrivateKey) (filename string, err error) {
+	keys := make([]jose.JSONWebKey, len(rootKeys))
+	for i := range rootKeys {
+		jwk, err := makeSigningKeyWithChain(rootKeys[i], i)
+		if err != nil {
+			return "", err
+		}
+		keys[i] = *jwk
+	}
+	jwks := jose.JSONWebKeySet{
+		Keys: keys,
+	}
+	tempFile, err := os.CreateTemp("", "jwksBundle")
+	if err != nil {
+		return "", err
+	}
+	defer tempFile.Close()
+
+	if err := json.NewEncoder(tempFile).Encode(jwks); err != nil {
+		return "", err
+	}
+
+	return tempFile.Name(), nil
+}
+
 // TestAccessController tests complete integration of the token auth package.
 // It starts by mocking the options for a token auth accessController which
 // it creates. It then tries a few mock requests:
@@ -323,6 +429,11 @@ func TestAccessController(t *testing.T) {
 	}
 	defer os.Remove(rootCertBundleFilename)
 
+	jwksFilename, err := writeTempJWKS(rootKeys)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	realm := "https://auth.example.com/token/"
 	issuer := "test-issuer.example.com"
 	service := "test-service.example.com"
@@ -333,6 +444,7 @@ func TestAccessController(t *testing.T) {
 		"service":        service,
 		"rootcertbundle": rootCertBundleFilename,
 		"autoredirect":   false,
+		"jwks":           jwksFilename,
 	}
 
 	accessController, err := newAccessController(options)
@@ -370,20 +482,25 @@ func TestAccessController(t *testing.T) {
 	}
 
 	// 2. Supply an invalid token.
+	invalidJwk, err := makeSigningKeyWithChain(rootKeys[1], 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	token, err := makeTestToken(
-		issuer, service,
+		invalidJwk, issuer, service,
 		[]*ResourceActions{{
 			Type:    testAccess.Type,
 			Name:    testAccess.Name,
 			Actions: []string{testAccess.Action},
 		}},
-		rootKeys[1], 1, time.Now(), time.Now().Add(5*time.Minute), // Everything is valid except the key which signed it.
+		time.Now(), time.Now().Add(5*time.Minute), // Everything is valid except the key which signed it.
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.Raw))
 
 	authCtx, err = accessController.Authorized(ctx, testAccess)
 	challenge, ok = err.(auth.Challenge)
@@ -399,17 +516,23 @@ func TestAccessController(t *testing.T) {
 		t.Fatalf("expected nil auth context but got %s", authCtx)
 	}
 
+	// create a valid jwk
+	jwk, err := makeSigningKeyWithChain(rootKeys[0], 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	// 3. Supply a token with insufficient access.
 	token, err = makeTestToken(
-		issuer, service,
+		jwk, issuer, service,
 		[]*ResourceActions{}, // No access specified.
-		rootKeys[0], 1, time.Now(), time.Now().Add(5*time.Minute),
+		time.Now(), time.Now().Add(5*time.Minute),
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.Raw))
 
 	authCtx, err = accessController.Authorized(ctx, testAccess)
 	challenge, ok = err.(auth.Challenge)
@@ -427,19 +550,19 @@ func TestAccessController(t *testing.T) {
 
 	// 4. Supply the token we need, or deserve, or whatever.
 	token, err = makeTestToken(
-		issuer, service,
+		jwk, issuer, service,
 		[]*ResourceActions{{
 			Type:    testAccess.Type,
 			Name:    testAccess.Name,
 			Actions: []string{testAccess.Action},
 		}},
-		rootKeys[0], 1, time.Now(), time.Now().Add(5*time.Minute),
+		time.Now(), time.Now().Add(5*time.Minute),
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.Raw))
 
 	authCtx, err = accessController.Authorized(ctx, testAccess)
 	if err != nil {
@@ -457,19 +580,19 @@ func TestAccessController(t *testing.T) {
 
 	// 5. Supply a token with full admin rights, which is represented as "*".
 	token, err = makeTestToken(
-		issuer, service,
+		jwk, issuer, service,
 		[]*ResourceActions{{
 			Type:    testAccess.Type,
 			Name:    testAccess.Name,
 			Actions: []string{"*"},
 		}},
-		rootKeys[0], 1, time.Now(), time.Now().Add(5*time.Minute),
+		time.Now(), time.Now().Add(5*time.Minute),
 	)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.Raw))
 
 	_, err = accessController.Authorized(ctx, testAccess)
 	if err != nil {
@@ -496,11 +619,11 @@ func TestNewAccessControllerPemBlock(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	keyBlock, err := rootKeys[0].PEMBlock()
+	bytes, err := x509.MarshalECPrivateKey(rootKeys[0])
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = pem.Encode(file, keyBlock)
+	_, err = file.Write(bytes)
 	if err != nil {
 		t.Fatal(err)
 	}

registry/auth/token/util.go

@@ -1,36 +1,5 @@
 package token
 
-import (
-	"encoding/base64"
-	"errors"
-	"strings"
-)
-
-// joseBase64UrlEncode encodes the given data using the standard base64 url
-// encoding format but with all trailing '=' characters omitted in accordance
-// with the jose specification.
-// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
-func joseBase64UrlEncode(b []byte) string {
-	return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
-}
-
-// joseBase64UrlDecode decodes the given string using the standard base64 url
-// decoder but first adds the appropriate number of trailing '=' characters in
-// accordance with the jose specification.
-// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
-func joseBase64UrlDecode(s string) ([]byte, error) {
-	switch len(s) % 4 {
-	case 0:
-	case 2:
-		s += "=="
-	case 3:
-		s += "="
-	default:
-		return nil, errors.New("illegal base64url string")
-	}
-	return base64.URLEncoding.DecodeString(s)
-}
-
 // actionSet is a special type of stringSet.
 type actionSet struct {
 	stringSet

vendor/github.com/docker/libtrust/CONTRIBUTING.md

@@ -1,13 +0,0 @@
-# Contributing to libtrust
-
-Want to hack on libtrust? Awesome! Here are instructions to get you
-started.
-
-libtrust is a part of the [Docker](https://www.docker.com) project, and follows
-the same rules and principles. If you're already familiar with the way
-Docker does things, you'll feel right at home.
-
-Otherwise, go read
-[Docker's contributions guidelines](https://github.com/docker/docker/blob/master/CONTRIBUTING.md).
-
-Happy hacking!

vendor/github.com/docker/libtrust/MAINTAINERS

@@ -1,3 +0,0 @@
-Solomon Hykes <solomon@docker.com>
-Josh Hawn <josh@docker.com> (github: jlhawn)
-Derek McGowan <derek@docker.com> (github: dmcgowan)

vendor/github.com/docker/libtrust/README.md

@@ -1,18 +0,0 @@
-# libtrust
-
-Libtrust is library for managing authentication and authorization using public key cryptography.
-
-Authentication is handled using the identity attached to the public key.
-Libtrust provides multiple methods to prove possession of the private key associated with an identity.
- - TLS x509 certificates
- - Signature verification
- - Key Challenge
-
-Authorization and access control is managed through a distributed trust graph.
-Trust servers are used as the authorities of the trust graph and allow caching portions of the graph for faster access.
-
-## Copyright and license
-
-Code and documentation copyright 2014 Docker, inc. Code released under the Apache 2.0 license.
-Docs released under Creative commons.
-

vendor/github.com/docker/libtrust/certificates.go

@@ -1,175 +0,0 @@
-package libtrust
-
-import (
-	"crypto/rand"
-	"crypto/x509"
-	"crypto/x509/pkix"
-	"encoding/pem"
-	"fmt"
-	"io/ioutil"
-	"math/big"
-	"net"
-	"time"
-)
-
-type certTemplateInfo struct {
-	commonName  string
-	domains     []string
-	ipAddresses []net.IP
-	isCA        bool
-	clientAuth  bool
-	serverAuth  bool
-}
-
-func generateCertTemplate(info *certTemplateInfo) *x509.Certificate {
-	// Generate a certificate template which is valid from the past week to
-	// 10 years from now. The usage of the certificate depends on the
-	// specified fields in the given certTempInfo object.
-	var (
-		keyUsage    x509.KeyUsage
-		extKeyUsage []x509.ExtKeyUsage
-	)
-
-	if info.isCA {
-		keyUsage = x509.KeyUsageCertSign
-	}
-
-	if info.clientAuth {
-		extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageClientAuth)
-	}
-
-	if info.serverAuth {
-		extKeyUsage = append(extKeyUsage, x509.ExtKeyUsageServerAuth)
-	}
-
-	return &x509.Certificate{
-		SerialNumber: big.NewInt(0),
-		Subject: pkix.Name{
-			CommonName: info.commonName,
-		},
-		NotBefore:             time.Now().Add(-time.Hour * 24 * 7),
-		NotAfter:              time.Now().Add(time.Hour * 24 * 365 * 10),
-		DNSNames:              info.domains,
-		IPAddresses:           info.ipAddresses,
-		IsCA:                  info.isCA,
-		KeyUsage:              keyUsage,
-		ExtKeyUsage:           extKeyUsage,
-		BasicConstraintsValid: info.isCA,
-	}
-}
-
-func generateCert(pub PublicKey, priv PrivateKey, subInfo, issInfo *certTemplateInfo) (cert *x509.Certificate, err error) {
-	pubCertTemplate := generateCertTemplate(subInfo)
-	privCertTemplate := generateCertTemplate(issInfo)
-
-	certDER, err := x509.CreateCertificate(
-		rand.Reader, pubCertTemplate, privCertTemplate,
-		pub.CryptoPublicKey(), priv.CryptoPrivateKey(),
-	)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create certificate: %s", err)
-	}
-
-	cert, err = x509.ParseCertificate(certDER)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse certificate: %s", err)
-	}
-
-	return
-}
-
-// GenerateSelfSignedServerCert creates a self-signed certificate for the
-// given key which is to be used for TLS servers with the given domains and
-// IP addresses.
-func GenerateSelfSignedServerCert(key PrivateKey, domains []string, ipAddresses []net.IP) (*x509.Certificate, error) {
-	info := &certTemplateInfo{
-		commonName:  key.KeyID(),
-		domains:     domains,
-		ipAddresses: ipAddresses,
-		serverAuth:  true,
-	}
-
-	return generateCert(key.PublicKey(), key, info, info)
-}
-
-// GenerateSelfSignedClientCert creates a self-signed certificate for the
-// given key which is to be used for TLS clients.
-func GenerateSelfSignedClientCert(key PrivateKey) (*x509.Certificate, error) {
-	info := &certTemplateInfo{
-		commonName: key.KeyID(),
-		clientAuth: true,
-	}
-
-	return generateCert(key.PublicKey(), key, info, info)
-}
-
-// GenerateCACert creates a certificate which can be used as a trusted
-// certificate authority.
-func GenerateCACert(signer PrivateKey, trustedKey PublicKey) (*x509.Certificate, error) {
-	subjectInfo := &certTemplateInfo{
-		commonName: trustedKey.KeyID(),
-		isCA:       true,
-	}
-	issuerInfo := &certTemplateInfo{
-		commonName: signer.KeyID(),
-	}
-
-	return generateCert(trustedKey, signer, subjectInfo, issuerInfo)
-}
-
-// GenerateCACertPool creates a certificate authority pool to be used for a
-// TLS configuration. Any self-signed certificates issued by the specified
-// trusted keys will be verified during a TLS handshake
-func GenerateCACertPool(signer PrivateKey, trustedKeys []PublicKey) (*x509.CertPool, error) {
-	certPool := x509.NewCertPool()
-
-	for _, trustedKey := range trustedKeys {
-		cert, err := GenerateCACert(signer, trustedKey)
-		if err != nil {
-			return nil, fmt.Errorf("failed to generate CA certificate: %s", err)
-		}
-
-		certPool.AddCert(cert)
-	}
-
-	return certPool, nil
-}
-
-// LoadCertificateBundle loads certificates from the given file.  The file should be pem encoded
-// containing one or more certificates.  The expected pem type is "CERTIFICATE".
-func LoadCertificateBundle(filename string) ([]*x509.Certificate, error) {
-	b, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return nil, err
-	}
-	certificates := []*x509.Certificate{}
-	var block *pem.Block
-	block, b = pem.Decode(b)
-	for ; block != nil; block, b = pem.Decode(b) {
-		if block.Type == "CERTIFICATE" {
-			cert, err := x509.ParseCertificate(block.Bytes)
-			if err != nil {
-				return nil, err
-			}
-			certificates = append(certificates, cert)
-		} else {
-			return nil, fmt.Errorf("invalid pem block type: %s", block.Type)
-		}
-	}
-
-	return certificates, nil
-}
-
-// LoadCertificatePool loads a CA pool from the given file.  The file should be pem encoded
-// containing one or more certificates. The expected pem type is "CERTIFICATE".
-func LoadCertificatePool(filename string) (*x509.CertPool, error) {
-	certs, err := LoadCertificateBundle(filename)
-	if err != nil {
-		return nil, err
-	}
-	pool := x509.NewCertPool()
-	for _, cert := range certs {
-		pool.AddCert(cert)
-	}
-	return pool, nil
-}

vendor/github.com/docker/libtrust/doc.go

@@ -1,9 +0,0 @@
-/*
-Package libtrust provides an interface for managing authentication and
-authorization using public key cryptography. Authentication is handled
-using the identity attached to the public key and verified through TLS
-x509 certificates, a key challenge, or signature. Authorization and
-access control is managed through a trust graph distributed between
-both remote trust servers and locally cached and managed data.
-*/
-package libtrust

vendor/github.com/docker/libtrust/ec_key.go

@@ -1,428 +0,0 @@
-package libtrust
-
-import (
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/x509"
-	"encoding/json"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	"math/big"
-)
-
-/*
- * EC DSA PUBLIC KEY
- */
-
-// ecPublicKey implements a libtrust.PublicKey using elliptic curve digital
-// signature algorithms.
-type ecPublicKey struct {
-	*ecdsa.PublicKey
-	curveName          string
-	signatureAlgorithm *signatureAlgorithm
-	extended           map[string]interface{}
-}
-
-func fromECPublicKey(cryptoPublicKey *ecdsa.PublicKey) (*ecPublicKey, error) {
-	curve := cryptoPublicKey.Curve
-
-	switch {
-	case curve == elliptic.P256():
-		return &ecPublicKey{cryptoPublicKey, "P-256", es256, map[string]interface{}{}}, nil
-	case curve == elliptic.P384():
-		return &ecPublicKey{cryptoPublicKey, "P-384", es384, map[string]interface{}{}}, nil
-	case curve == elliptic.P521():
-		return &ecPublicKey{cryptoPublicKey, "P-521", es512, map[string]interface{}{}}, nil
-	default:
-		return nil, errors.New("unsupported elliptic curve")
-	}
-}
-
-// KeyType returns the key type for elliptic curve keys, i.e., "EC".
-func (k *ecPublicKey) KeyType() string {
-	return "EC"
-}
-
-// CurveName returns the elliptic curve identifier.
-// Possible values are "P-256", "P-384", and "P-521".
-func (k *ecPublicKey) CurveName() string {
-	return k.curveName
-}
-
-// KeyID returns a distinct identifier which is unique to this Public Key.
-func (k *ecPublicKey) KeyID() string {
-	return keyIDFromCryptoKey(k)
-}
-
-func (k *ecPublicKey) String() string {
-	return fmt.Sprintf("EC Public Key <%s>", k.KeyID())
-}
-
-// Verify verifyies the signature of the data in the io.Reader using this
-// PublicKey. The alg parameter should identify the digital signature
-// algorithm which was used to produce the signature and should be supported
-// by this public key. Returns a nil error if the signature is valid.
-func (k *ecPublicKey) Verify(data io.Reader, alg string, signature []byte) error {
-	// For EC keys there is only one supported signature algorithm depending
-	// on the curve parameters.
-	if k.signatureAlgorithm.HeaderParam() != alg {
-		return fmt.Errorf("unable to verify signature: EC Public Key with curve %q does not support signature algorithm %q", k.curveName, alg)
-	}
-
-	// signature is the concatenation of (r, s), base64Url encoded.
-	sigLength := len(signature)
-	expectedOctetLength := 2 * ((k.Params().BitSize + 7) >> 3)
-	if sigLength != expectedOctetLength {
-		return fmt.Errorf("signature length is %d octets long, should be %d", sigLength, expectedOctetLength)
-	}
-
-	rBytes, sBytes := signature[:sigLength/2], signature[sigLength/2:]
-	r := new(big.Int).SetBytes(rBytes)
-	s := new(big.Int).SetBytes(sBytes)
-
-	hasher := k.signatureAlgorithm.HashID().New()
-	_, err := io.Copy(hasher, data)
-	if err != nil {
-		return fmt.Errorf("error reading data to sign: %s", err)
-	}
-	hash := hasher.Sum(nil)
-
-	if !ecdsa.Verify(k.PublicKey, hash, r, s) {
-		return errors.New("invalid signature")
-	}
-
-	return nil
-}
-
-// CryptoPublicKey returns the internal object which can be used as a
-// crypto.PublicKey for use with other standard library operations. The type
-// is either *rsa.PublicKey or *ecdsa.PublicKey
-func (k *ecPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return k.PublicKey
-}
-
-func (k *ecPublicKey) toMap() map[string]interface{} {
-	jwk := make(map[string]interface{})
-	for k, v := range k.extended {
-		jwk[k] = v
-	}
-	jwk["kty"] = k.KeyType()
-	jwk["kid"] = k.KeyID()
-	jwk["crv"] = k.CurveName()
-
-	xBytes := k.X.Bytes()
-	yBytes := k.Y.Bytes()
-	octetLength := (k.Params().BitSize + 7) >> 3
-	// MUST include leading zeros in the output so that x, y are each
-	// *octetLength* bytes long.
-	xBuf := make([]byte, octetLength-len(xBytes), octetLength)
-	yBuf := make([]byte, octetLength-len(yBytes), octetLength)
-	xBuf = append(xBuf, xBytes...)
-	yBuf = append(yBuf, yBytes...)
-
-	jwk["x"] = joseBase64UrlEncode(xBuf)
-	jwk["y"] = joseBase64UrlEncode(yBuf)
-
-	return jwk
-}
-
-// MarshalJSON serializes this Public Key using the JWK JSON serialization format for
-// elliptic curve keys.
-func (k *ecPublicKey) MarshalJSON() (data []byte, err error) {
-	return json.Marshal(k.toMap())
-}
-
-// PEMBlock serializes this Public Key to DER-encoded PKIX format.
-func (k *ecPublicKey) PEMBlock() (*pem.Block, error) {
-	derBytes, err := x509.MarshalPKIXPublicKey(k.PublicKey)
-	if err != nil {
-		return nil, fmt.Errorf("unable to serialize EC PublicKey to DER-encoded PKIX format: %s", err)
-	}
-	k.extended["kid"] = k.KeyID() // For display purposes.
-	return createPemBlock("PUBLIC KEY", derBytes, k.extended)
-}
-
-func (k *ecPublicKey) AddExtendedField(field string, value interface{}) {
-	k.extended[field] = value
-}
-
-func (k *ecPublicKey) GetExtendedField(field string) interface{} {
-	v, ok := k.extended[field]
-	if !ok {
-		return nil
-	}
-	return v
-}
-
-func ecPublicKeyFromMap(jwk map[string]interface{}) (*ecPublicKey, error) {
-	// JWK key type (kty) has already been determined to be "EC".
-	// Need to extract 'crv', 'x', 'y', and 'kid' and check for
-	// consistency.
-
-	// Get the curve identifier value.
-	crv, err := stringFromMap(jwk, "crv")
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Public Key curve identifier: %s", err)
-	}
-
-	var (
-		curve  elliptic.Curve
-		sigAlg *signatureAlgorithm
-	)
-
-	switch {
-	case crv == "P-256":
-		curve = elliptic.P256()
-		sigAlg = es256
-	case crv == "P-384":
-		curve = elliptic.P384()
-		sigAlg = es384
-	case crv == "P-521":
-		curve = elliptic.P521()
-		sigAlg = es512
-	default:
-		return nil, fmt.Errorf("JWK EC Public Key curve identifier not supported: %q\n", crv)
-	}
-
-	// Get the X and Y coordinates for the public key point.
-	xB64Url, err := stringFromMap(jwk, "x")
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Public Key x-coordinate: %s", err)
-	}
-	x, err := parseECCoordinate(xB64Url, curve)
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Public Key x-coordinate: %s", err)
-	}
-
-	yB64Url, err := stringFromMap(jwk, "y")
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Public Key y-coordinate: %s", err)
-	}
-	y, err := parseECCoordinate(yB64Url, curve)
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Public Key y-coordinate: %s", err)
-	}
-
-	key := &ecPublicKey{
-		PublicKey: &ecdsa.PublicKey{Curve: curve, X: x, Y: y},
-		curveName: crv, signatureAlgorithm: sigAlg,
-	}
-
-	// Key ID is optional too, but if it exists, it should match the key.
-	_, ok := jwk["kid"]
-	if ok {
-		kid, err := stringFromMap(jwk, "kid")
-		if err != nil {
-			return nil, fmt.Errorf("JWK EC Public Key ID: %s", err)
-		}
-		if kid != key.KeyID() {
-			return nil, fmt.Errorf("JWK EC Public Key ID does not match: %s", kid)
-		}
-	}
-
-	key.extended = jwk
-
-	return key, nil
-}
-
-/*
- * EC DSA PRIVATE KEY
- */
-
-// ecPrivateKey implements a JWK Private Key using elliptic curve digital signature
-// algorithms.
-type ecPrivateKey struct {
-	ecPublicKey
-	*ecdsa.PrivateKey
-}
-
-func fromECPrivateKey(cryptoPrivateKey *ecdsa.PrivateKey) (*ecPrivateKey, error) {
-	publicKey, err := fromECPublicKey(&cryptoPrivateKey.PublicKey)
-	if err != nil {
-		return nil, err
-	}
-
-	return &ecPrivateKey{*publicKey, cryptoPrivateKey}, nil
-}
-
-// PublicKey returns the Public Key data associated with this Private Key.
-func (k *ecPrivateKey) PublicKey() PublicKey {
-	return &k.ecPublicKey
-}
-
-func (k *ecPrivateKey) String() string {
-	return fmt.Sprintf("EC Private Key <%s>", k.KeyID())
-}
-
-// Sign signs the data read from the io.Reader using a signature algorithm supported
-// by the elliptic curve private key. If the specified hashing algorithm is
-// supported by this key, that hash function is used to generate the signature
-// otherwise the the default hashing algorithm for this key is used. Returns
-// the signature and the name of the JWK signature algorithm used, e.g.,
-// "ES256", "ES384", "ES512".
-func (k *ecPrivateKey) Sign(data io.Reader, hashID crypto.Hash) (signature []byte, alg string, err error) {
-	// Generate a signature of the data using the internal alg.
-	// The given hashId is only a suggestion, and since EC keys only support
-	// on signature/hash algorithm given the curve name, we disregard it for
-	// the elliptic curve JWK signature implementation.
-	hasher := k.signatureAlgorithm.HashID().New()
-	_, err = io.Copy(hasher, data)
-	if err != nil {
-		return nil, "", fmt.Errorf("error reading data to sign: %s", err)
-	}
-	hash := hasher.Sum(nil)
-
-	r, s, err := ecdsa.Sign(rand.Reader, k.PrivateKey, hash)
-	if err != nil {
-		return nil, "", fmt.Errorf("error producing signature: %s", err)
-	}
-	rBytes, sBytes := r.Bytes(), s.Bytes()
-	octetLength := (k.ecPublicKey.Params().BitSize + 7) >> 3
-	// MUST include leading zeros in the output
-	rBuf := make([]byte, octetLength-len(rBytes), octetLength)
-	sBuf := make([]byte, octetLength-len(sBytes), octetLength)
-
-	rBuf = append(rBuf, rBytes...)
-	sBuf = append(sBuf, sBytes...)
-
-	signature = append(rBuf, sBuf...)
-	alg = k.signatureAlgorithm.HeaderParam()
-
-	return
-}
-
-// CryptoPrivateKey returns the internal object which can be used as a
-// crypto.PublicKey for use with other standard library operations. The type
-// is either *rsa.PublicKey or *ecdsa.PublicKey
-func (k *ecPrivateKey) CryptoPrivateKey() crypto.PrivateKey {
-	return k.PrivateKey
-}
-
-func (k *ecPrivateKey) toMap() map[string]interface{} {
-	jwk := k.ecPublicKey.toMap()
-
-	dBytes := k.D.Bytes()
-	// The length of this octet string MUST be ceiling(log-base-2(n)/8)
-	// octets (where n is the order of the curve). This is because the private
-	// key d must be in the interval [1, n-1] so the bitlength of d should be
-	// no larger than the bitlength of n-1. The easiest way to find the octet
-	// length is to take bitlength(n-1), add 7 to force a carry, and shift this
-	// bit sequence right by 3, which is essentially dividing by 8 and adding
-	// 1 if there is any remainder. Thus, the private key value d should be
-	// output to (bitlength(n-1)+7)>>3 octets.
-	n := k.ecPublicKey.Params().N
-	octetLength := (new(big.Int).Sub(n, big.NewInt(1)).BitLen() + 7) >> 3
-	// Create a buffer with the necessary zero-padding.
-	dBuf := make([]byte, octetLength-len(dBytes), octetLength)
-	dBuf = append(dBuf, dBytes...)
-
-	jwk["d"] = joseBase64UrlEncode(dBuf)
-
-	return jwk
-}
-
-// MarshalJSON serializes this Private Key using the JWK JSON serialization format for
-// elliptic curve keys.
-func (k *ecPrivateKey) MarshalJSON() (data []byte, err error) {
-	return json.Marshal(k.toMap())
-}
-
-// PEMBlock serializes this Private Key to DER-encoded PKIX format.
-func (k *ecPrivateKey) PEMBlock() (*pem.Block, error) {
-	derBytes, err := x509.MarshalECPrivateKey(k.PrivateKey)
-	if err != nil {
-		return nil, fmt.Errorf("unable to serialize EC PrivateKey to DER-encoded PKIX format: %s", err)
-	}
-	k.extended["keyID"] = k.KeyID() // For display purposes.
-	return createPemBlock("EC PRIVATE KEY", derBytes, k.extended)
-}
-
-func ecPrivateKeyFromMap(jwk map[string]interface{}) (*ecPrivateKey, error) {
-	dB64Url, err := stringFromMap(jwk, "d")
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Private Key: %s", err)
-	}
-
-	// JWK key type (kty) has already been determined to be "EC".
-	// Need to extract the public key information, then extract the private
-	// key value 'd'.
-	publicKey, err := ecPublicKeyFromMap(jwk)
-	if err != nil {
-		return nil, err
-	}
-
-	d, err := parseECPrivateParam(dB64Url, publicKey.Curve)
-	if err != nil {
-		return nil, fmt.Errorf("JWK EC Private Key d-param: %s", err)
-	}
-
-	key := &ecPrivateKey{
-		ecPublicKey: *publicKey,
-		PrivateKey: &ecdsa.PrivateKey{
-			PublicKey: *publicKey.PublicKey,
-			D:         d,
-		},
-	}
-
-	return key, nil
-}
-
-/*
- *	Key Generation Functions.
- */
-
-func generateECPrivateKey(curve elliptic.Curve) (k *ecPrivateKey, err error) {
-	k = new(ecPrivateKey)
-	k.PrivateKey, err = ecdsa.GenerateKey(curve, rand.Reader)
-	if err != nil {
-		return nil, err
-	}
-
-	k.ecPublicKey.PublicKey = &k.PrivateKey.PublicKey
-	k.extended = make(map[string]interface{})
-
-	return
-}
-
-// GenerateECP256PrivateKey generates a key pair using elliptic curve P-256.
-func GenerateECP256PrivateKey() (PrivateKey, error) {
-	k, err := generateECPrivateKey(elliptic.P256())
-	if err != nil {
-		return nil, fmt.Errorf("error generating EC P-256 key: %s", err)
-	}
-
-	k.curveName = "P-256"
-	k.signatureAlgorithm = es256
-
-	return k, nil
-}
-
-// GenerateECP384PrivateKey generates a key pair using elliptic curve P-384.
-func GenerateECP384PrivateKey() (PrivateKey, error) {
-	k, err := generateECPrivateKey(elliptic.P384())
-	if err != nil {
-		return nil, fmt.Errorf("error generating EC P-384 key: %s", err)
-	}
-
-	k.curveName = "P-384"
-	k.signatureAlgorithm = es384
-
-	return k, nil
-}
-
-// GenerateECP521PrivateKey generates aß key pair using elliptic curve P-521.
-func GenerateECP521PrivateKey() (PrivateKey, error) {
-	k, err := generateECPrivateKey(elliptic.P521())
-	if err != nil {
-		return nil, fmt.Errorf("error generating EC P-521 key: %s", err)
-	}
-
-	k.curveName = "P-521"
-	k.signatureAlgorithm = es512
-
-	return k, nil
-}

vendor/github.com/docker/libtrust/filter.go

@@ -1,50 +0,0 @@
-package libtrust
-
-import (
-	"path/filepath"
-)
-
-// FilterByHosts filters the list of PublicKeys to only those which contain a
-// 'hosts' pattern which matches the given host. If *includeEmpty* is true,
-// then keys which do not specify any hosts are also returned.
-func FilterByHosts(keys []PublicKey, host string, includeEmpty bool) ([]PublicKey, error) {
-	filtered := make([]PublicKey, 0, len(keys))
-
-	for _, pubKey := range keys {
-		var hosts []string
-		switch v := pubKey.GetExtendedField("hosts").(type) {
-		case []string:
-			hosts = v
-		case []interface{}:
-			for _, value := range v {
-				h, ok := value.(string)
-				if !ok {
-					continue
-				}
-				hosts = append(hosts, h)
-			}
-		}
-
-		if len(hosts) == 0 {
-			if includeEmpty {
-				filtered = append(filtered, pubKey)
-			}
-			continue
-		}
-
-		// Check if any hosts match pattern
-		for _, hostPattern := range hosts {
-			match, err := filepath.Match(hostPattern, host)
-			if err != nil {
-				return nil, err
-			}
-
-			if match {
-				filtered = append(filtered, pubKey)
-				continue
-			}
-		}
-	}
-
-	return filtered, nil
-}

vendor/github.com/docker/libtrust/hash.go

@@ -1,56 +0,0 @@
-package libtrust
-
-import (
-	"crypto"
-	_ "crypto/sha256" // Registrer SHA224 and SHA256
-	_ "crypto/sha512" // Registrer SHA384 and SHA512
-	"fmt"
-)
-
-type signatureAlgorithm struct {
-	algHeaderParam string
-	hashID         crypto.Hash
-}
-
-func (h *signatureAlgorithm) HeaderParam() string {
-	return h.algHeaderParam
-}
-
-func (h *signatureAlgorithm) HashID() crypto.Hash {
-	return h.hashID
-}
-
-var (
-	rs256 = &signatureAlgorithm{"RS256", crypto.SHA256}
-	rs384 = &signatureAlgorithm{"RS384", crypto.SHA384}
-	rs512 = &signatureAlgorithm{"RS512", crypto.SHA512}
-	es256 = &signatureAlgorithm{"ES256", crypto.SHA256}
-	es384 = &signatureAlgorithm{"ES384", crypto.SHA384}
-	es512 = &signatureAlgorithm{"ES512", crypto.SHA512}
-)
-
-func rsaSignatureAlgorithmByName(alg string) (*signatureAlgorithm, error) {
-	switch {
-	case alg == "RS256":
-		return rs256, nil
-	case alg == "RS384":
-		return rs384, nil
-	case alg == "RS512":
-		return rs512, nil
-	default:
-		return nil, fmt.Errorf("RSA Digital Signature Algorithm %q not supported", alg)
-	}
-}
-
-func rsaPKCS1v15SignatureAlgorithmForHashID(hashID crypto.Hash) *signatureAlgorithm {
-	switch {
-	case hashID == crypto.SHA512:
-		return rs512
-	case hashID == crypto.SHA384:
-		return rs384
-	case hashID == crypto.SHA256:
-		fallthrough
-	default:
-		return rs256
-	}
-}

vendor/github.com/docker/libtrust/jsonsign.go

@@ -1,657 +0,0 @@
-package libtrust
-
-import (
-	"bytes"
-	"crypto"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"sort"
-	"time"
-	"unicode"
-)
-
-var (
-	// ErrInvalidSignContent is used when the content to be signed is invalid.
-	ErrInvalidSignContent = errors.New("invalid sign content")
-
-	// ErrInvalidJSONContent is used when invalid json is encountered.
-	ErrInvalidJSONContent = errors.New("invalid json content")
-
-	// ErrMissingSignatureKey is used when the specified signature key
-	// does not exist in the JSON content.
-	ErrMissingSignatureKey = errors.New("missing signature key")
-)
-
-type jsHeader struct {
-	JWK       PublicKey `json:"jwk,omitempty"`
-	Algorithm string    `json:"alg"`
-	Chain     []string  `json:"x5c,omitempty"`
-}
-
-type jsSignature struct {
-	Header    jsHeader `json:"header"`
-	Signature string   `json:"signature"`
-	Protected string   `json:"protected,omitempty"`
-}
-
-type jsSignaturesSorted []jsSignature
-
-func (jsbkid jsSignaturesSorted) Swap(i, j int) { jsbkid[i], jsbkid[j] = jsbkid[j], jsbkid[i] }
-func (jsbkid jsSignaturesSorted) Len() int      { return len(jsbkid) }
-
-func (jsbkid jsSignaturesSorted) Less(i, j int) bool {
-	ki, kj := jsbkid[i].Header.JWK.KeyID(), jsbkid[j].Header.JWK.KeyID()
-	si, sj := jsbkid[i].Signature, jsbkid[j].Signature
-
-	if ki == kj {
-		return si < sj
-	}
-
-	return ki < kj
-}
-
-type signKey struct {
-	PrivateKey
-	Chain []*x509.Certificate
-}
-
-// JSONSignature represents a signature of a json object.
-type JSONSignature struct {
-	payload      string
-	signatures   []jsSignature
-	indent       string
-	formatLength int
-	formatTail   []byte
-}
-
-func newJSONSignature() *JSONSignature {
-	return &JSONSignature{
-		signatures: make([]jsSignature, 0, 1),
-	}
-}
-
-// Payload returns the encoded payload of the signature. This
-// payload should not be signed directly
-func (js *JSONSignature) Payload() ([]byte, error) {
-	return joseBase64UrlDecode(js.payload)
-}
-
-func (js *JSONSignature) protectedHeader() (string, error) {
-	protected := map[string]interface{}{
-		"formatLength": js.formatLength,
-		"formatTail":   joseBase64UrlEncode(js.formatTail),
-		"time":         time.Now().UTC().Format(time.RFC3339),
-	}
-	protectedBytes, err := json.Marshal(protected)
-	if err != nil {
-		return "", err
-	}
-
-	return joseBase64UrlEncode(protectedBytes), nil
-}
-
-func (js *JSONSignature) signBytes(protectedHeader string) ([]byte, error) {
-	buf := make([]byte, len(js.payload)+len(protectedHeader)+1)
-	copy(buf, protectedHeader)
-	buf[len(protectedHeader)] = '.'
-	copy(buf[len(protectedHeader)+1:], js.payload)
-	return buf, nil
-}
-
-// Sign adds a signature using the given private key.
-func (js *JSONSignature) Sign(key PrivateKey) error {
-	protected, err := js.protectedHeader()
-	if err != nil {
-		return err
-	}
-	signBytes, err := js.signBytes(protected)
-	if err != nil {
-		return err
-	}
-	sigBytes, algorithm, err := key.Sign(bytes.NewReader(signBytes), crypto.SHA256)
-	if err != nil {
-		return err
-	}
-
-	js.signatures = append(js.signatures, jsSignature{
-		Header: jsHeader{
-			JWK:       key.PublicKey(),
-			Algorithm: algorithm,
-		},
-		Signature: joseBase64UrlEncode(sigBytes),
-		Protected: protected,
-	})
-
-	return nil
-}
-
-// SignWithChain adds a signature using the given private key
-// and setting the x509 chain. The public key of the first element
-// in the chain must be the public key corresponding with the sign key.
-func (js *JSONSignature) SignWithChain(key PrivateKey, chain []*x509.Certificate) error {
-	// Ensure key.Chain[0] is public key for key
-	//key.Chain.PublicKey
-	//key.PublicKey().CryptoPublicKey()
-
-	// Verify chain
-	protected, err := js.protectedHeader()
-	if err != nil {
-		return err
-	}
-	signBytes, err := js.signBytes(protected)
-	if err != nil {
-		return err
-	}
-	sigBytes, algorithm, err := key.Sign(bytes.NewReader(signBytes), crypto.SHA256)
-	if err != nil {
-		return err
-	}
-
-	header := jsHeader{
-		Chain:     make([]string, len(chain)),
-		Algorithm: algorithm,
-	}
-
-	for i, cert := range chain {
-		header.Chain[i] = base64.StdEncoding.EncodeToString(cert.Raw)
-	}
-
-	js.signatures = append(js.signatures, jsSignature{
-		Header:    header,
-		Signature: joseBase64UrlEncode(sigBytes),
-		Protected: protected,
-	})
-
-	return nil
-}
-
-// Verify verifies all the signatures and returns the list of
-// public keys used to sign. Any x509 chains are not checked.
-func (js *JSONSignature) Verify() ([]PublicKey, error) {
-	keys := make([]PublicKey, len(js.signatures))
-	for i, signature := range js.signatures {
-		signBytes, err := js.signBytes(signature.Protected)
-		if err != nil {
-			return nil, err
-		}
-		var publicKey PublicKey
-		if len(signature.Header.Chain) > 0 {
-			certBytes, err := base64.StdEncoding.DecodeString(signature.Header.Chain[0])
-			if err != nil {
-				return nil, err
-			}
-			cert, err := x509.ParseCertificate(certBytes)
-			if err != nil {
-				return nil, err
-			}
-			publicKey, err = FromCryptoPublicKey(cert.PublicKey)
-			if err != nil {
-				return nil, err
-			}
-		} else if signature.Header.JWK != nil {
-			publicKey = signature.Header.JWK
-		} else {
-			return nil, errors.New("missing public key")
-		}
-
-		sigBytes, err := joseBase64UrlDecode(signature.Signature)
-		if err != nil {
-			return nil, err
-		}
-
-		err = publicKey.Verify(bytes.NewReader(signBytes), signature.Header.Algorithm, sigBytes)
-		if err != nil {
-			return nil, err
-		}
-
-		keys[i] = publicKey
-	}
-	return keys, nil
-}
-
-// VerifyChains verifies all the signatures and the chains associated
-// with each signature and returns the list of verified chains.
-// Signatures without an x509 chain are not checked.
-func (js *JSONSignature) VerifyChains(ca *x509.CertPool) ([][]*x509.Certificate, error) {
-	chains := make([][]*x509.Certificate, 0, len(js.signatures))
-	for _, signature := range js.signatures {
-		signBytes, err := js.signBytes(signature.Protected)
-		if err != nil {
-			return nil, err
-		}
-		var publicKey PublicKey
-		if len(signature.Header.Chain) > 0 {
-			certBytes, err := base64.StdEncoding.DecodeString(signature.Header.Chain[0])
-			if err != nil {
-				return nil, err
-			}
-			cert, err := x509.ParseCertificate(certBytes)
-			if err != nil {
-				return nil, err
-			}
-			publicKey, err = FromCryptoPublicKey(cert.PublicKey)
-			if err != nil {
-				return nil, err
-			}
-			intermediates := x509.NewCertPool()
-			if len(signature.Header.Chain) > 1 {
-				intermediateChain := signature.Header.Chain[1:]
-				for i := range intermediateChain {
-					certBytes, err := base64.StdEncoding.DecodeString(intermediateChain[i])
-					if err != nil {
-						return nil, err
-					}
-					intermediate, err := x509.ParseCertificate(certBytes)
-					if err != nil {
-						return nil, err
-					}
-					intermediates.AddCert(intermediate)
-				}
-			}
-
-			verifyOptions := x509.VerifyOptions{
-				Intermediates: intermediates,
-				Roots:         ca,
-			}
-
-			verifiedChains, err := cert.Verify(verifyOptions)
-			if err != nil {
-				return nil, err
-			}
-			chains = append(chains, verifiedChains...)
-
-			sigBytes, err := joseBase64UrlDecode(signature.Signature)
-			if err != nil {
-				return nil, err
-			}
-
-			err = publicKey.Verify(bytes.NewReader(signBytes), signature.Header.Algorithm, sigBytes)
-			if err != nil {
-				return nil, err
-			}
-		}
-
-	}
-	return chains, nil
-}
-
-// JWS returns JSON serialized JWS according to
-// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-7.2
-func (js *JSONSignature) JWS() ([]byte, error) {
-	if len(js.signatures) == 0 {
-		return nil, errors.New("missing signature")
-	}
-
-	sort.Sort(jsSignaturesSorted(js.signatures))
-
-	jsonMap := map[string]interface{}{
-		"payload":    js.payload,
-		"signatures": js.signatures,
-	}
-
-	return json.MarshalIndent(jsonMap, "", "   ")
-}
-
-func notSpace(r rune) bool {
-	return !unicode.IsSpace(r)
-}
-
-func detectJSONIndent(jsonContent []byte) (indent string) {
-	if len(jsonContent) > 2 && jsonContent[0] == '{' && jsonContent[1] == '\n' {
-		quoteIndex := bytes.IndexRune(jsonContent[1:], '"')
-		if quoteIndex > 0 {
-			indent = string(jsonContent[2 : quoteIndex+1])
-		}
-	}
-	return
-}
-
-type jsParsedHeader struct {
-	JWK       json.RawMessage `json:"jwk"`
-	Algorithm string          `json:"alg"`
-	Chain     []string        `json:"x5c"`
-}
-
-type jsParsedSignature struct {
-	Header    jsParsedHeader `json:"header"`
-	Signature string         `json:"signature"`
-	Protected string         `json:"protected"`
-}
-
-// ParseJWS parses a JWS serialized JSON object into a Json Signature.
-func ParseJWS(content []byte) (*JSONSignature, error) {
-	type jsParsed struct {
-		Payload    string              `json:"payload"`
-		Signatures []jsParsedSignature `json:"signatures"`
-	}
-	parsed := &jsParsed{}
-	err := json.Unmarshal(content, parsed)
-	if err != nil {
-		return nil, err
-	}
-	if len(parsed.Signatures) == 0 {
-		return nil, errors.New("missing signatures")
-	}
-	payload, err := joseBase64UrlDecode(parsed.Payload)
-	if err != nil {
-		return nil, err
-	}
-
-	js, err := NewJSONSignature(payload)
-	if err != nil {
-		return nil, err
-	}
-	js.signatures = make([]jsSignature, len(parsed.Signatures))
-	for i, signature := range parsed.Signatures {
-		header := jsHeader{
-			Algorithm: signature.Header.Algorithm,
-		}
-		if signature.Header.Chain != nil {
-			header.Chain = signature.Header.Chain
-		}
-		if signature.Header.JWK != nil {
-			publicKey, err := UnmarshalPublicKeyJWK([]byte(signature.Header.JWK))
-			if err != nil {
-				return nil, err
-			}
-			header.JWK = publicKey
-		}
-		js.signatures[i] = jsSignature{
-			Header:    header,
-			Signature: signature.Signature,
-			Protected: signature.Protected,
-		}
-	}
-
-	return js, nil
-}
-
-// NewJSONSignature returns a new unsigned JWS from a json byte array.
-// JSONSignature will need to be signed before serializing or storing.
-// Optionally, one or more signatures can be provided as byte buffers,
-// containing serialized JWS signatures, to assemble a fully signed JWS
-// package. It is the callers responsibility to ensure uniqueness of the
-// provided signatures.
-func NewJSONSignature(content []byte, signatures ...[]byte) (*JSONSignature, error) {
-	var dataMap map[string]interface{}
-	err := json.Unmarshal(content, &dataMap)
-	if err != nil {
-		return nil, err
-	}
-
-	js := newJSONSignature()
-	js.indent = detectJSONIndent(content)
-
-	js.payload = joseBase64UrlEncode(content)
-
-	// Find trailing } and whitespace, put in protected header
-	closeIndex := bytes.LastIndexFunc(content, notSpace)
-	if content[closeIndex] != '}' {
-		return nil, ErrInvalidJSONContent
-	}
-	lastRuneIndex := bytes.LastIndexFunc(content[:closeIndex], notSpace)
-	if content[lastRuneIndex] == ',' {
-		return nil, ErrInvalidJSONContent
-	}
-	js.formatLength = lastRuneIndex + 1
-	js.formatTail = content[js.formatLength:]
-
-	if len(signatures) > 0 {
-		for _, signature := range signatures {
-			var parsedJSig jsParsedSignature
-
-			if err := json.Unmarshal(signature, &parsedJSig); err != nil {
-				return nil, err
-			}
-
-			// TODO(stevvooe): A lot of the code below is repeated in
-			// ParseJWS. It will require more refactoring to fix that.
-			jsig := jsSignature{
-				Header: jsHeader{
-					Algorithm: parsedJSig.Header.Algorithm,
-				},
-				Signature: parsedJSig.Signature,
-				Protected: parsedJSig.Protected,
-			}
-
-			if parsedJSig.Header.Chain != nil {
-				jsig.Header.Chain = parsedJSig.Header.Chain
-			}
-
-			if parsedJSig.Header.JWK != nil {
-				publicKey, err := UnmarshalPublicKeyJWK([]byte(parsedJSig.Header.JWK))
-				if err != nil {
-					return nil, err
-				}
-				jsig.Header.JWK = publicKey
-			}
-
-			js.signatures = append(js.signatures, jsig)
-		}
-	}
-
-	return js, nil
-}
-
-// NewJSONSignatureFromMap returns a new unsigned JSONSignature from a map or
-// struct. JWS will need to be signed before serializing or storing.
-func NewJSONSignatureFromMap(content interface{}) (*JSONSignature, error) {
-	switch content.(type) {
-	case map[string]interface{}:
-	case struct{}:
-	default:
-		return nil, errors.New("invalid data type")
-	}
-
-	js := newJSONSignature()
-	js.indent = "   "
-
-	payload, err := json.MarshalIndent(content, "", js.indent)
-	if err != nil {
-		return nil, err
-	}
-	js.payload = joseBase64UrlEncode(payload)
-
-	// Remove '\n}' from formatted section, put in protected header
-	js.formatLength = len(payload) - 2
-	js.formatTail = payload[js.formatLength:]
-
-	return js, nil
-}
-
-func readIntFromMap(key string, m map[string]interface{}) (int, bool) {
-	value, ok := m[key]
-	if !ok {
-		return 0, false
-	}
-	switch v := value.(type) {
-	case int:
-		return v, true
-	case float64:
-		return int(v), true
-	default:
-		return 0, false
-	}
-}
-
-func readStringFromMap(key string, m map[string]interface{}) (v string, ok bool) {
-	value, ok := m[key]
-	if !ok {
-		return "", false
-	}
-	v, ok = value.(string)
-	return
-}
-
-// ParsePrettySignature parses a formatted signature into a
-// JSON signature. If the signatures are missing the format information
-// an error is thrown. The formatted signature must be created by
-// the same method as format signature.
-func ParsePrettySignature(content []byte, signatureKey string) (*JSONSignature, error) {
-	var contentMap map[string]json.RawMessage
-	err := json.Unmarshal(content, &contentMap)
-	if err != nil {
-		return nil, fmt.Errorf("error unmarshalling content: %s", err)
-	}
-	sigMessage, ok := contentMap[signatureKey]
-	if !ok {
-		return nil, ErrMissingSignatureKey
-	}
-
-	var signatureBlocks []jsParsedSignature
-	err = json.Unmarshal([]byte(sigMessage), &signatureBlocks)
-	if err != nil {
-		return nil, fmt.Errorf("error unmarshalling signatures: %s", err)
-	}
-
-	js := newJSONSignature()
-	js.signatures = make([]jsSignature, len(signatureBlocks))
-
-	for i, signatureBlock := range signatureBlocks {
-		protectedBytes, err := joseBase64UrlDecode(signatureBlock.Protected)
-		if err != nil {
-			return nil, fmt.Errorf("base64 decode error: %s", err)
-		}
-		var protectedHeader map[string]interface{}
-		err = json.Unmarshal(protectedBytes, &protectedHeader)
-		if err != nil {
-			return nil, fmt.Errorf("error unmarshalling protected header: %s", err)
-		}
-
-		formatLength, ok := readIntFromMap("formatLength", protectedHeader)
-		if !ok {
-			return nil, errors.New("missing formatted length")
-		}
-		encodedTail, ok := readStringFromMap("formatTail", protectedHeader)
-		if !ok {
-			return nil, errors.New("missing formatted tail")
-		}
-		formatTail, err := joseBase64UrlDecode(encodedTail)
-		if err != nil {
-			return nil, fmt.Errorf("base64 decode error on tail: %s", err)
-		}
-		if js.formatLength == 0 {
-			js.formatLength = formatLength
-		} else if js.formatLength != formatLength {
-			return nil, errors.New("conflicting format length")
-		}
-		if len(js.formatTail) == 0 {
-			js.formatTail = formatTail
-		} else if bytes.Compare(js.formatTail, formatTail) != 0 {
-			return nil, errors.New("conflicting format tail")
-		}
-
-		header := jsHeader{
-			Algorithm: signatureBlock.Header.Algorithm,
-			Chain:     signatureBlock.Header.Chain,
-		}
-		if signatureBlock.Header.JWK != nil {
-			publicKey, err := UnmarshalPublicKeyJWK([]byte(signatureBlock.Header.JWK))
-			if err != nil {
-				return nil, fmt.Errorf("error unmarshalling public key: %s", err)
-			}
-			header.JWK = publicKey
-		}
-		js.signatures[i] = jsSignature{
-			Header:    header,
-			Signature: signatureBlock.Signature,
-			Protected: signatureBlock.Protected,
-		}
-	}
-	if js.formatLength > len(content) {
-		return nil, errors.New("invalid format length")
-	}
-	formatted := make([]byte, js.formatLength+len(js.formatTail))
-	copy(formatted, content[:js.formatLength])
-	copy(formatted[js.formatLength:], js.formatTail)
-	js.indent = detectJSONIndent(formatted)
-	js.payload = joseBase64UrlEncode(formatted)
-
-	return js, nil
-}
-
-// PrettySignature formats a json signature into an easy to read
-// single json serialized object.
-func (js *JSONSignature) PrettySignature(signatureKey string) ([]byte, error) {
-	if len(js.signatures) == 0 {
-		return nil, errors.New("no signatures")
-	}
-	payload, err := joseBase64UrlDecode(js.payload)
-	if err != nil {
-		return nil, err
-	}
-	payload = payload[:js.formatLength]
-
-	sort.Sort(jsSignaturesSorted(js.signatures))
-
-	var marshalled []byte
-	var marshallErr error
-	if js.indent != "" {
-		marshalled, marshallErr = json.MarshalIndent(js.signatures, js.indent, js.indent)
-	} else {
-		marshalled, marshallErr = json.Marshal(js.signatures)
-	}
-	if marshallErr != nil {
-		return nil, marshallErr
-	}
-
-	buf := bytes.NewBuffer(make([]byte, 0, len(payload)+len(marshalled)+34))
-	buf.Write(payload)
-	buf.WriteByte(',')
-	if js.indent != "" {
-		buf.WriteByte('\n')
-		buf.WriteString(js.indent)
-		buf.WriteByte('"')
-		buf.WriteString(signatureKey)
-		buf.WriteString("\": ")
-		buf.Write(marshalled)
-		buf.WriteByte('\n')
-	} else {
-		buf.WriteByte('"')
-		buf.WriteString(signatureKey)
-		buf.WriteString("\":")
-		buf.Write(marshalled)
-	}
-	buf.WriteByte('}')
-
-	return buf.Bytes(), nil
-}
-
-// Signatures provides the signatures on this JWS as opaque blobs, sorted by
-// keyID. These blobs can be stored and reassembled with payloads. Internally,
-// they are simply marshaled json web signatures but implementations should
-// not rely on this.
-func (js *JSONSignature) Signatures() ([][]byte, error) {
-	sort.Sort(jsSignaturesSorted(js.signatures))
-
-	var sb [][]byte
-	for _, jsig := range js.signatures {
-		p, err := json.Marshal(jsig)
-		if err != nil {
-			return nil, err
-		}
-
-		sb = append(sb, p)
-	}
-
-	return sb, nil
-}
-
-// Merge combines the signatures from one or more other signatures into the
-// method receiver. If the payloads differ for any argument, an error will be
-// returned and the receiver will not be modified.
-func (js *JSONSignature) Merge(others ...*JSONSignature) error {
-	merged := js.signatures
-	for _, other := range others {
-		if js.payload != other.payload {
-			return fmt.Errorf("payloads differ from merge target")
-		}
-		merged = append(merged, other.signatures...)
-	}
-
-	js.signatures = merged
-	return nil
-}

vendor/github.com/docker/libtrust/key.go

@@ -1,253 +0,0 @@
-package libtrust
-
-import (
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/json"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-)
-
-// PublicKey is a generic interface for a Public Key.
-type PublicKey interface {
-	// KeyType returns the key type for this key. For elliptic curve keys,
-	// this value should be "EC". For RSA keys, this value should be "RSA".
-	KeyType() string
-	// KeyID returns a distinct identifier which is unique to this Public Key.
-	// The format generated by this library is a base32 encoding of a 240 bit
-	// hash of the public key data divided into 12 groups like so:
-	//    ABCD:EFGH:IJKL:MNOP:QRST:UVWX:YZ23:4567:ABCD:EFGH:IJKL:MNOP
-	KeyID() string
-	// Verify verifyies the signature of the data in the io.Reader using this
-	// Public Key. The alg parameter should identify the digital signature
-	// algorithm which was used to produce the signature and should be
-	// supported by this public key. Returns a nil error if the signature
-	// is valid.
-	Verify(data io.Reader, alg string, signature []byte) error
-	// CryptoPublicKey returns the internal object which can be used as a
-	// crypto.PublicKey for use with other standard library operations. The type
-	// is either *rsa.PublicKey or *ecdsa.PublicKey
-	CryptoPublicKey() crypto.PublicKey
-	// These public keys can be serialized to the standard JSON encoding for
-	// JSON Web Keys. See section 6 of the IETF draft RFC for JOSE JSON Web
-	// Algorithms.
-	MarshalJSON() ([]byte, error)
-	// These keys can also be serialized to the standard PEM encoding.
-	PEMBlock() (*pem.Block, error)
-	// The string representation of a key is its key type and ID.
-	String() string
-	AddExtendedField(string, interface{})
-	GetExtendedField(string) interface{}
-}
-
-// PrivateKey is a generic interface for a Private Key.
-type PrivateKey interface {
-	// A PrivateKey contains all fields and methods of a PublicKey of the
-	// same type. The MarshalJSON method also outputs the private key as a
-	// JSON Web Key, and the PEMBlock method outputs the private key as a
-	// PEM block.
-	PublicKey
-	// PublicKey returns the PublicKey associated with this PrivateKey.
-	PublicKey() PublicKey
-	// Sign signs the data read from the io.Reader using a signature algorithm
-	// supported by the private key. If the specified hashing algorithm is
-	// supported by this key, that hash function is used to generate the
-	// signature otherwise the the default hashing algorithm for this key is
-	// used. Returns the signature and identifier of the algorithm used.
-	Sign(data io.Reader, hashID crypto.Hash) (signature []byte, alg string, err error)
-	// CryptoPrivateKey returns the internal object which can be used as a
-	// crypto.PublicKey for use with other standard library operations. The
-	// type is either *rsa.PublicKey or *ecdsa.PublicKey
-	CryptoPrivateKey() crypto.PrivateKey
-}
-
-// FromCryptoPublicKey returns a libtrust PublicKey representation of the given
-// *ecdsa.PublicKey or *rsa.PublicKey. Returns a non-nil error when the given
-// key is of an unsupported type.
-func FromCryptoPublicKey(cryptoPublicKey crypto.PublicKey) (PublicKey, error) {
-	switch cryptoPublicKey := cryptoPublicKey.(type) {
-	case *ecdsa.PublicKey:
-		return fromECPublicKey(cryptoPublicKey)
-	case *rsa.PublicKey:
-		return fromRSAPublicKey(cryptoPublicKey), nil
-	default:
-		return nil, fmt.Errorf("public key type %T is not supported", cryptoPublicKey)
-	}
-}
-
-// FromCryptoPrivateKey returns a libtrust PrivateKey representation of the given
-// *ecdsa.PrivateKey or *rsa.PrivateKey. Returns a non-nil error when the given
-// key is of an unsupported type.
-func FromCryptoPrivateKey(cryptoPrivateKey crypto.PrivateKey) (PrivateKey, error) {
-	switch cryptoPrivateKey := cryptoPrivateKey.(type) {
-	case *ecdsa.PrivateKey:
-		return fromECPrivateKey(cryptoPrivateKey)
-	case *rsa.PrivateKey:
-		return fromRSAPrivateKey(cryptoPrivateKey), nil
-	default:
-		return nil, fmt.Errorf("private key type %T is not supported", cryptoPrivateKey)
-	}
-}
-
-// UnmarshalPublicKeyPEM parses the PEM encoded data and returns a libtrust
-// PublicKey or an error if there is a problem with the encoding.
-func UnmarshalPublicKeyPEM(data []byte) (PublicKey, error) {
-	pemBlock, _ := pem.Decode(data)
-	if pemBlock == nil {
-		return nil, errors.New("unable to find PEM encoded data")
-	} else if pemBlock.Type != "PUBLIC KEY" {
-		return nil, fmt.Errorf("unable to get PublicKey from PEM type: %s", pemBlock.Type)
-	}
-
-	return pubKeyFromPEMBlock(pemBlock)
-}
-
-// UnmarshalPublicKeyPEMBundle parses the PEM encoded data as a bundle of
-// PEM blocks appended one after the other and returns a slice of PublicKey
-// objects that it finds.
-func UnmarshalPublicKeyPEMBundle(data []byte) ([]PublicKey, error) {
-	pubKeys := []PublicKey{}
-
-	for {
-		var pemBlock *pem.Block
-		pemBlock, data = pem.Decode(data)
-		if pemBlock == nil {
-			break
-		} else if pemBlock.Type != "PUBLIC KEY" {
-			return nil, fmt.Errorf("unable to get PublicKey from PEM type: %s", pemBlock.Type)
-		}
-
-		pubKey, err := pubKeyFromPEMBlock(pemBlock)
-		if err != nil {
-			return nil, err
-		}
-
-		pubKeys = append(pubKeys, pubKey)
-	}
-
-	return pubKeys, nil
-}
-
-// UnmarshalPrivateKeyPEM parses the PEM encoded data and returns a libtrust
-// PrivateKey or an error if there is a problem with the encoding.
-func UnmarshalPrivateKeyPEM(data []byte) (PrivateKey, error) {
-	pemBlock, _ := pem.Decode(data)
-	if pemBlock == nil {
-		return nil, errors.New("unable to find PEM encoded data")
-	}
-
-	var key PrivateKey
-
-	switch {
-	case pemBlock.Type == "RSA PRIVATE KEY":
-		rsaPrivateKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode RSA Private Key PEM data: %s", err)
-		}
-		key = fromRSAPrivateKey(rsaPrivateKey)
-	case pemBlock.Type == "EC PRIVATE KEY":
-		ecPrivateKey, err := x509.ParseECPrivateKey(pemBlock.Bytes)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode EC Private Key PEM data: %s", err)
-		}
-		key, err = fromECPrivateKey(ecPrivateKey)
-		if err != nil {
-			return nil, err
-		}
-	default:
-		return nil, fmt.Errorf("unable to get PrivateKey from PEM type: %s", pemBlock.Type)
-	}
-
-	addPEMHeadersToKey(pemBlock, key.PublicKey())
-
-	return key, nil
-}
-
-// UnmarshalPublicKeyJWK unmarshals the given JSON Web Key into a generic
-// Public Key to be used with libtrust.
-func UnmarshalPublicKeyJWK(data []byte) (PublicKey, error) {
-	jwk := make(map[string]interface{})
-
-	err := json.Unmarshal(data, &jwk)
-	if err != nil {
-		return nil, fmt.Errorf(
-			"decoding JWK Public Key JSON data: %s\n", err,
-		)
-	}
-
-	// Get the Key Type value.
-	kty, err := stringFromMap(jwk, "kty")
-	if err != nil {
-		return nil, fmt.Errorf("JWK Public Key type: %s", err)
-	}
-
-	switch {
-	case kty == "EC":
-		// Call out to unmarshal EC public key.
-		return ecPublicKeyFromMap(jwk)
-	case kty == "RSA":
-		// Call out to unmarshal RSA public key.
-		return rsaPublicKeyFromMap(jwk)
-	default:
-		return nil, fmt.Errorf(
-			"JWK Public Key type not supported: %q\n", kty,
-		)
-	}
-}
-
-// UnmarshalPublicKeyJWKSet parses the JSON encoded data as a JSON Web Key Set
-// and returns a slice of Public Key objects.
-func UnmarshalPublicKeyJWKSet(data []byte) ([]PublicKey, error) {
-	rawKeys, err := loadJSONKeySetRaw(data)
-	if err != nil {
-		return nil, err
-	}
-
-	pubKeys := make([]PublicKey, 0, len(rawKeys))
-
-	for _, rawKey := range rawKeys {
-		pubKey, err := UnmarshalPublicKeyJWK(rawKey)
-		if err != nil {
-			return nil, err
-		}
-		pubKeys = append(pubKeys, pubKey)
-	}
-
-	return pubKeys, nil
-}
-
-// UnmarshalPrivateKeyJWK unmarshals the given JSON Web Key into a generic
-// Private Key to be used with libtrust.
-func UnmarshalPrivateKeyJWK(data []byte) (PrivateKey, error) {
-	jwk := make(map[string]interface{})
-
-	err := json.Unmarshal(data, &jwk)
-	if err != nil {
-		return nil, fmt.Errorf(
-			"decoding JWK Private Key JSON data: %s\n", err,
-		)
-	}
-
-	// Get the Key Type value.
-	kty, err := stringFromMap(jwk, "kty")
-	if err != nil {
-		return nil, fmt.Errorf("JWK Private Key type: %s", err)
-	}
-
-	switch {
-	case kty == "EC":
-		// Call out to unmarshal EC private key.
-		return ecPrivateKeyFromMap(jwk)
-	case kty == "RSA":
-		// Call out to unmarshal RSA private key.
-		return rsaPrivateKeyFromMap(jwk)
-	default:
-		return nil, fmt.Errorf(
-			"JWK Private Key type not supported: %q\n", kty,
-		)
-	}
-}

vendor/github.com/docker/libtrust/key_files.go

@@ -1,255 +0,0 @@
-package libtrust
-
-import (
-	"encoding/json"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"strings"
-)
-
-var (
-	// ErrKeyFileDoesNotExist indicates that the private key file does not exist.
-	ErrKeyFileDoesNotExist = errors.New("key file does not exist")
-)
-
-func readKeyFileBytes(filename string) ([]byte, error) {
-	data, err := ioutil.ReadFile(filename)
-	if err != nil {
-		if os.IsNotExist(err) {
-			err = ErrKeyFileDoesNotExist
-		} else {
-			err = fmt.Errorf("unable to read key file %s: %s", filename, err)
-		}
-
-		return nil, err
-	}
-
-	return data, nil
-}
-
-/*
-	Loading and Saving of Public and Private Keys in either PEM or JWK format.
-*/
-
-// LoadKeyFile opens the given filename and attempts to read a Private Key
-// encoded in either PEM or JWK format (if .json or .jwk file extension).
-func LoadKeyFile(filename string) (PrivateKey, error) {
-	contents, err := readKeyFileBytes(filename)
-	if err != nil {
-		return nil, err
-	}
-
-	var key PrivateKey
-
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		key, err = UnmarshalPrivateKeyJWK(contents)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode private key JWK: %s", err)
-		}
-	} else {
-		key, err = UnmarshalPrivateKeyPEM(contents)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode private key PEM: %s", err)
-		}
-	}
-
-	return key, nil
-}
-
-// LoadPublicKeyFile opens the given filename and attempts to read a Public Key
-// encoded in either PEM or JWK format (if .json or .jwk file extension).
-func LoadPublicKeyFile(filename string) (PublicKey, error) {
-	contents, err := readKeyFileBytes(filename)
-	if err != nil {
-		return nil, err
-	}
-
-	var key PublicKey
-
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		key, err = UnmarshalPublicKeyJWK(contents)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode public key JWK: %s", err)
-		}
-	} else {
-		key, err = UnmarshalPublicKeyPEM(contents)
-		if err != nil {
-			return nil, fmt.Errorf("unable to decode public key PEM: %s", err)
-		}
-	}
-
-	return key, nil
-}
-
-// SaveKey saves the given key to a file using the provided filename.
-// This process will overwrite any existing file at the provided location.
-func SaveKey(filename string, key PrivateKey) error {
-	var encodedKey []byte
-	var err error
-
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		// Encode in JSON Web Key format.
-		encodedKey, err = json.MarshalIndent(key, "", "    ")
-		if err != nil {
-			return fmt.Errorf("unable to encode private key JWK: %s", err)
-		}
-	} else {
-		// Encode in PEM format.
-		pemBlock, err := key.PEMBlock()
-		if err != nil {
-			return fmt.Errorf("unable to encode private key PEM: %s", err)
-		}
-		encodedKey = pem.EncodeToMemory(pemBlock)
-	}
-
-	err = ioutil.WriteFile(filename, encodedKey, os.FileMode(0600))
-	if err != nil {
-		return fmt.Errorf("unable to write private key file %s: %s", filename, err)
-	}
-
-	return nil
-}
-
-// SavePublicKey saves the given public key to the file.
-func SavePublicKey(filename string, key PublicKey) error {
-	var encodedKey []byte
-	var err error
-
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		// Encode in JSON Web Key format.
-		encodedKey, err = json.MarshalIndent(key, "", "    ")
-		if err != nil {
-			return fmt.Errorf("unable to encode public key JWK: %s", err)
-		}
-	} else {
-		// Encode in PEM format.
-		pemBlock, err := key.PEMBlock()
-		if err != nil {
-			return fmt.Errorf("unable to encode public key PEM: %s", err)
-		}
-		encodedKey = pem.EncodeToMemory(pemBlock)
-	}
-
-	err = ioutil.WriteFile(filename, encodedKey, os.FileMode(0644))
-	if err != nil {
-		return fmt.Errorf("unable to write public key file %s: %s", filename, err)
-	}
-
-	return nil
-}
-
-// Public Key Set files
-
-type jwkSet struct {
-	Keys []json.RawMessage `json:"keys"`
-}
-
-// LoadKeySetFile loads a key set
-func LoadKeySetFile(filename string) ([]PublicKey, error) {
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		return loadJSONKeySetFile(filename)
-	}
-
-	// Must be a PEM format file
-	return loadPEMKeySetFile(filename)
-}
-
-func loadJSONKeySetRaw(data []byte) ([]json.RawMessage, error) {
-	if len(data) == 0 {
-		// This is okay, just return an empty slice.
-		return []json.RawMessage{}, nil
-	}
-
-	keySet := jwkSet{}
-
-	err := json.Unmarshal(data, &keySet)
-	if err != nil {
-		return nil, fmt.Errorf("unable to decode JSON Web Key Set: %s", err)
-	}
-
-	return keySet.Keys, nil
-}
-
-func loadJSONKeySetFile(filename string) ([]PublicKey, error) {
-	contents, err := readKeyFileBytes(filename)
-	if err != nil && err != ErrKeyFileDoesNotExist {
-		return nil, err
-	}
-
-	return UnmarshalPublicKeyJWKSet(contents)
-}
-
-func loadPEMKeySetFile(filename string) ([]PublicKey, error) {
-	data, err := readKeyFileBytes(filename)
-	if err != nil && err != ErrKeyFileDoesNotExist {
-		return nil, err
-	}
-
-	return UnmarshalPublicKeyPEMBundle(data)
-}
-
-// AddKeySetFile adds a key to a key set
-func AddKeySetFile(filename string, key PublicKey) error {
-	if strings.HasSuffix(filename, ".json") || strings.HasSuffix(filename, ".jwk") {
-		return addKeySetJSONFile(filename, key)
-	}
-
-	// Must be a PEM format file
-	return addKeySetPEMFile(filename, key)
-}
-
-func addKeySetJSONFile(filename string, key PublicKey) error {
-	encodedKey, err := json.Marshal(key)
-	if err != nil {
-		return fmt.Errorf("unable to encode trusted client key: %s", err)
-	}
-
-	contents, err := readKeyFileBytes(filename)
-	if err != nil && err != ErrKeyFileDoesNotExist {
-		return err
-	}
-
-	rawEntries, err := loadJSONKeySetRaw(contents)
-	if err != nil {
-		return err
-	}
-
-	rawEntries = append(rawEntries, json.RawMessage(encodedKey))
-	entriesWrapper := jwkSet{Keys: rawEntries}
-
-	encodedEntries, err := json.MarshalIndent(entriesWrapper, "", "    ")
-	if err != nil {
-		return fmt.Errorf("unable to encode trusted client keys: %s", err)
-	}
-
-	err = ioutil.WriteFile(filename, encodedEntries, os.FileMode(0644))
-	if err != nil {
-		return fmt.Errorf("unable to write trusted client keys file %s: %s", filename, err)
-	}
-
-	return nil
-}
-
-func addKeySetPEMFile(filename string, key PublicKey) error {
-	// Encode to PEM, open file for appending, write PEM.
-	file, err := os.OpenFile(filename, os.O_CREATE|os.O_APPEND|os.O_RDWR, os.FileMode(0644))
-	if err != nil {
-		return fmt.Errorf("unable to open trusted client keys file %s: %s", filename, err)
-	}
-	defer file.Close()
-
-	pemBlock, err := key.PEMBlock()
-	if err != nil {
-		return fmt.Errorf("unable to encoded trusted key: %s", err)
-	}
-
-	_, err = file.Write(pem.EncodeToMemory(pemBlock))
-	if err != nil {
-		return fmt.Errorf("unable to write trusted keys file: %s", err)
-	}
-
-	return nil
-}

vendor/github.com/docker/libtrust/key_manager.go

@@ -1,175 +0,0 @@
-package libtrust
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"fmt"
-	"io/ioutil"
-	"net"
-	"os"
-	"path"
-	"sync"
-)
-
-// ClientKeyManager manages client keys on the filesystem
-type ClientKeyManager struct {
-	key        PrivateKey
-	clientFile string
-	clientDir  string
-
-	clientLock sync.RWMutex
-	clients    []PublicKey
-
-	configLock sync.Mutex
-	configs    []*tls.Config
-}
-
-// NewClientKeyManager loads a new manager from a set of key files
-// and managed by the given private key.
-func NewClientKeyManager(trustKey PrivateKey, clientFile, clientDir string) (*ClientKeyManager, error) {
-	m := &ClientKeyManager{
-		key:        trustKey,
-		clientFile: clientFile,
-		clientDir:  clientDir,
-	}
-	if err := m.loadKeys(); err != nil {
-		return nil, err
-	}
-	// TODO Start watching file and directory
-
-	return m, nil
-}
-
-func (c *ClientKeyManager) loadKeys() (err error) {
-	// Load authorized keys file
-	var clients []PublicKey
-	if c.clientFile != "" {
-		clients, err = LoadKeySetFile(c.clientFile)
-		if err != nil {
-			return fmt.Errorf("unable to load authorized keys: %s", err)
-		}
-	}
-
-	// Add clients from authorized keys directory
-	files, err := ioutil.ReadDir(c.clientDir)
-	if err != nil && !os.IsNotExist(err) {
-		return fmt.Errorf("unable to open authorized keys directory: %s", err)
-	}
-	for _, f := range files {
-		if !f.IsDir() {
-			publicKey, err := LoadPublicKeyFile(path.Join(c.clientDir, f.Name()))
-			if err != nil {
-				return fmt.Errorf("unable to load authorized key file: %s", err)
-			}
-			clients = append(clients, publicKey)
-		}
-	}
-
-	c.clientLock.Lock()
-	c.clients = clients
-	c.clientLock.Unlock()
-
-	return nil
-}
-
-// RegisterTLSConfig registers a tls configuration to manager
-// such that any changes to the keys may be reflected in
-// the tls client CA pool
-func (c *ClientKeyManager) RegisterTLSConfig(tlsConfig *tls.Config) error {
-	c.clientLock.RLock()
-	certPool, err := GenerateCACertPool(c.key, c.clients)
-	if err != nil {
-		return fmt.Errorf("CA pool generation error: %s", err)
-	}
-	c.clientLock.RUnlock()
-
-	tlsConfig.ClientCAs = certPool
-
-	c.configLock.Lock()
-	c.configs = append(c.configs, tlsConfig)
-	c.configLock.Unlock()
-
-	return nil
-}
-
-// NewIdentityAuthTLSConfig creates a tls.Config for the server to use for
-// libtrust identity authentication for the domain specified
-func NewIdentityAuthTLSConfig(trustKey PrivateKey, clients *ClientKeyManager, addr string, domain string) (*tls.Config, error) {
-	tlsConfig := newTLSConfig()
-
-	tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
-	if err := clients.RegisterTLSConfig(tlsConfig); err != nil {
-		return nil, err
-	}
-
-	// Generate cert
-	ips, domains, err := parseAddr(addr)
-	if err != nil {
-		return nil, err
-	}
-	// add domain that it expects clients to use
-	domains = append(domains, domain)
-	x509Cert, err := GenerateSelfSignedServerCert(trustKey, domains, ips)
-	if err != nil {
-		return nil, fmt.Errorf("certificate generation error: %s", err)
-	}
-	tlsConfig.Certificates = []tls.Certificate{{
-		Certificate: [][]byte{x509Cert.Raw},
-		PrivateKey:  trustKey.CryptoPrivateKey(),
-		Leaf:        x509Cert,
-	}}
-
-	return tlsConfig, nil
-}
-
-// NewCertAuthTLSConfig creates a tls.Config for the server to use for
-// certificate authentication
-func NewCertAuthTLSConfig(caPath, certPath, keyPath string) (*tls.Config, error) {
-	tlsConfig := newTLSConfig()
-
-	cert, err := tls.LoadX509KeyPair(certPath, keyPath)
-	if err != nil {
-		return nil, fmt.Errorf("Couldn't load X509 key pair (%s, %s): %s. Key encrypted?", certPath, keyPath, err)
-	}
-	tlsConfig.Certificates = []tls.Certificate{cert}
-
-	// Verify client certificates against a CA?
-	if caPath != "" {
-		certPool := x509.NewCertPool()
-		file, err := ioutil.ReadFile(caPath)
-		if err != nil {
-			return nil, fmt.Errorf("Couldn't read CA certificate: %s", err)
-		}
-		certPool.AppendCertsFromPEM(file)
-
-		tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert
-		tlsConfig.ClientCAs = certPool
-	}
-
-	return tlsConfig, nil
-}
-
-func newTLSConfig() *tls.Config {
-	return &tls.Config{
-		NextProtos: []string{"http/1.1"},
-		// Avoid fallback on insecure SSL protocols
-		MinVersion: tls.VersionTLS10,
-	}
-}
-
-// parseAddr parses an address into an array of IPs and domains
-func parseAddr(addr string) ([]net.IP, []string, error) {
-	host, _, err := net.SplitHostPort(addr)
-	if err != nil {
-		return nil, nil, err
-	}
-	var domains []string
-	var ips []net.IP
-	ip := net.ParseIP(host)
-	if ip != nil {
-		ips = []net.IP{ip}
-	} else {
-		domains = []string{host}
-	}
-	return ips, domains, nil
-}

vendor/github.com/docker/libtrust/rsa_key.go

@@ -1,427 +0,0 @@
-package libtrust
-
-import (
-	"crypto"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/json"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	"math/big"
-)
-
-/*
- * RSA DSA PUBLIC KEY
- */
-
-// rsaPublicKey implements a JWK Public Key using RSA digital signature algorithms.
-type rsaPublicKey struct {
-	*rsa.PublicKey
-	extended map[string]interface{}
-}
-
-func fromRSAPublicKey(cryptoPublicKey *rsa.PublicKey) *rsaPublicKey {
-	return &rsaPublicKey{cryptoPublicKey, map[string]interface{}{}}
-}
-
-// KeyType returns the JWK key type for RSA keys, i.e., "RSA".
-func (k *rsaPublicKey) KeyType() string {
-	return "RSA"
-}
-
-// KeyID returns a distinct identifier which is unique to this Public Key.
-func (k *rsaPublicKey) KeyID() string {
-	return keyIDFromCryptoKey(k)
-}
-
-func (k *rsaPublicKey) String() string {
-	return fmt.Sprintf("RSA Public Key <%s>", k.KeyID())
-}
-
-// Verify verifyies the signature of the data in the io.Reader using this Public Key.
-// The alg parameter should be the name of the JWA digital signature algorithm
-// which was used to produce the signature and should be supported by this
-// public key. Returns a nil error if the signature is valid.
-func (k *rsaPublicKey) Verify(data io.Reader, alg string, signature []byte) error {
-	// Verify the signature of the given date, return non-nil error if valid.
-	sigAlg, err := rsaSignatureAlgorithmByName(alg)
-	if err != nil {
-		return fmt.Errorf("unable to verify Signature: %s", err)
-	}
-
-	hasher := sigAlg.HashID().New()
-	_, err = io.Copy(hasher, data)
-	if err != nil {
-		return fmt.Errorf("error reading data to sign: %s", err)
-	}
-	hash := hasher.Sum(nil)
-
-	err = rsa.VerifyPKCS1v15(k.PublicKey, sigAlg.HashID(), hash, signature)
-	if err != nil {
-		return fmt.Errorf("invalid %s signature: %s", sigAlg.HeaderParam(), err)
-	}
-
-	return nil
-}
-
-// CryptoPublicKey returns the internal object which can be used as a
-// crypto.PublicKey for use with other standard library operations. The type
-// is either *rsa.PublicKey or *ecdsa.PublicKey
-func (k *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return k.PublicKey
-}
-
-func (k *rsaPublicKey) toMap() map[string]interface{} {
-	jwk := make(map[string]interface{})
-	for k, v := range k.extended {
-		jwk[k] = v
-	}
-	jwk["kty"] = k.KeyType()
-	jwk["kid"] = k.KeyID()
-	jwk["n"] = joseBase64UrlEncode(k.N.Bytes())
-	jwk["e"] = joseBase64UrlEncode(serializeRSAPublicExponentParam(k.E))
-
-	return jwk
-}
-
-// MarshalJSON serializes this Public Key using the JWK JSON serialization format for
-// RSA keys.
-func (k *rsaPublicKey) MarshalJSON() (data []byte, err error) {
-	return json.Marshal(k.toMap())
-}
-
-// PEMBlock serializes this Public Key to DER-encoded PKIX format.
-func (k *rsaPublicKey) PEMBlock() (*pem.Block, error) {
-	derBytes, err := x509.MarshalPKIXPublicKey(k.PublicKey)
-	if err != nil {
-		return nil, fmt.Errorf("unable to serialize RSA PublicKey to DER-encoded PKIX format: %s", err)
-	}
-	k.extended["kid"] = k.KeyID() // For display purposes.
-	return createPemBlock("PUBLIC KEY", derBytes, k.extended)
-}
-
-func (k *rsaPublicKey) AddExtendedField(field string, value interface{}) {
-	k.extended[field] = value
-}
-
-func (k *rsaPublicKey) GetExtendedField(field string) interface{} {
-	v, ok := k.extended[field]
-	if !ok {
-		return nil
-	}
-	return v
-}
-
-func rsaPublicKeyFromMap(jwk map[string]interface{}) (*rsaPublicKey, error) {
-	// JWK key type (kty) has already been determined to be "RSA".
-	// Need to extract 'n', 'e', and 'kid' and check for
-	// consistency.
-
-	// Get the modulus parameter N.
-	nB64Url, err := stringFromMap(jwk, "n")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Public Key modulus: %s", err)
-	}
-
-	n, err := parseRSAModulusParam(nB64Url)
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Public Key modulus: %s", err)
-	}
-
-	// Get the public exponent E.
-	eB64Url, err := stringFromMap(jwk, "e")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Public Key exponent: %s", err)
-	}
-
-	e, err := parseRSAPublicExponentParam(eB64Url)
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Public Key exponent: %s", err)
-	}
-
-	key := &rsaPublicKey{
-		PublicKey: &rsa.PublicKey{N: n, E: e},
-	}
-
-	// Key ID is optional, but if it exists, it should match the key.
-	_, ok := jwk["kid"]
-	if ok {
-		kid, err := stringFromMap(jwk, "kid")
-		if err != nil {
-			return nil, fmt.Errorf("JWK RSA Public Key ID: %s", err)
-		}
-		if kid != key.KeyID() {
-			return nil, fmt.Errorf("JWK RSA Public Key ID does not match: %s", kid)
-		}
-	}
-
-	if _, ok := jwk["d"]; ok {
-		return nil, fmt.Errorf("JWK RSA Public Key cannot contain private exponent")
-	}
-
-	key.extended = jwk
-
-	return key, nil
-}
-
-/*
- * RSA DSA PRIVATE KEY
- */
-
-// rsaPrivateKey implements a JWK Private Key using RSA digital signature algorithms.
-type rsaPrivateKey struct {
-	rsaPublicKey
-	*rsa.PrivateKey
-}
-
-func fromRSAPrivateKey(cryptoPrivateKey *rsa.PrivateKey) *rsaPrivateKey {
-	return &rsaPrivateKey{
-		*fromRSAPublicKey(&cryptoPrivateKey.PublicKey),
-		cryptoPrivateKey,
-	}
-}
-
-// PublicKey returns the Public Key data associated with this Private Key.
-func (k *rsaPrivateKey) PublicKey() PublicKey {
-	return &k.rsaPublicKey
-}
-
-func (k *rsaPrivateKey) String() string {
-	return fmt.Sprintf("RSA Private Key <%s>", k.KeyID())
-}
-
-// Sign signs the data read from the io.Reader using a signature algorithm supported
-// by the RSA private key. If the specified hashing algorithm is supported by
-// this key, that hash function is used to generate the signature otherwise the
-// the default hashing algorithm for this key is used. Returns the signature
-// and the name of the JWK signature algorithm used, e.g., "RS256", "RS384",
-// "RS512".
-func (k *rsaPrivateKey) Sign(data io.Reader, hashID crypto.Hash) (signature []byte, alg string, err error) {
-	// Generate a signature of the data using the internal alg.
-	sigAlg := rsaPKCS1v15SignatureAlgorithmForHashID(hashID)
-	hasher := sigAlg.HashID().New()
-
-	_, err = io.Copy(hasher, data)
-	if err != nil {
-		return nil, "", fmt.Errorf("error reading data to sign: %s", err)
-	}
-	hash := hasher.Sum(nil)
-
-	signature, err = rsa.SignPKCS1v15(rand.Reader, k.PrivateKey, sigAlg.HashID(), hash)
-	if err != nil {
-		return nil, "", fmt.Errorf("error producing signature: %s", err)
-	}
-
-	alg = sigAlg.HeaderParam()
-
-	return
-}
-
-// CryptoPrivateKey returns the internal object which can be used as a
-// crypto.PublicKey for use with other standard library operations. The type
-// is either *rsa.PublicKey or *ecdsa.PublicKey
-func (k *rsaPrivateKey) CryptoPrivateKey() crypto.PrivateKey {
-	return k.PrivateKey
-}
-
-func (k *rsaPrivateKey) toMap() map[string]interface{} {
-	k.Precompute() // Make sure the precomputed values are stored.
-	jwk := k.rsaPublicKey.toMap()
-
-	jwk["d"] = joseBase64UrlEncode(k.D.Bytes())
-	jwk["p"] = joseBase64UrlEncode(k.Primes[0].Bytes())
-	jwk["q"] = joseBase64UrlEncode(k.Primes[1].Bytes())
-	jwk["dp"] = joseBase64UrlEncode(k.Precomputed.Dp.Bytes())
-	jwk["dq"] = joseBase64UrlEncode(k.Precomputed.Dq.Bytes())
-	jwk["qi"] = joseBase64UrlEncode(k.Precomputed.Qinv.Bytes())
-
-	otherPrimes := k.Primes[2:]
-
-	if len(otherPrimes) > 0 {
-		otherPrimesInfo := make([]interface{}, len(otherPrimes))
-		for i, r := range otherPrimes {
-			otherPrimeInfo := make(map[string]string, 3)
-			otherPrimeInfo["r"] = joseBase64UrlEncode(r.Bytes())
-			crtVal := k.Precomputed.CRTValues[i]
-			otherPrimeInfo["d"] = joseBase64UrlEncode(crtVal.Exp.Bytes())
-			otherPrimeInfo["t"] = joseBase64UrlEncode(crtVal.Coeff.Bytes())
-			otherPrimesInfo[i] = otherPrimeInfo
-		}
-		jwk["oth"] = otherPrimesInfo
-	}
-
-	return jwk
-}
-
-// MarshalJSON serializes this Private Key using the JWK JSON serialization format for
-// RSA keys.
-func (k *rsaPrivateKey) MarshalJSON() (data []byte, err error) {
-	return json.Marshal(k.toMap())
-}
-
-// PEMBlock serializes this Private Key to DER-encoded PKIX format.
-func (k *rsaPrivateKey) PEMBlock() (*pem.Block, error) {
-	derBytes := x509.MarshalPKCS1PrivateKey(k.PrivateKey)
-	k.extended["keyID"] = k.KeyID() // For display purposes.
-	return createPemBlock("RSA PRIVATE KEY", derBytes, k.extended)
-}
-
-func rsaPrivateKeyFromMap(jwk map[string]interface{}) (*rsaPrivateKey, error) {
-	// The JWA spec for RSA Private Keys (draft rfc section 5.3.2) states that
-	// only the private key exponent 'd' is REQUIRED, the others are just for
-	// signature/decryption optimizations and SHOULD be included when the JWK
-	// is produced. We MAY choose to accept a JWK which only includes 'd', but
-	// we're going to go ahead and not choose to accept it without the extra
-	// fields. Only the 'oth' field will be optional (for multi-prime keys).
-	privateExponent, err := parseRSAPrivateKeyParamFromMap(jwk, "d")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key exponent: %s", err)
-	}
-	firstPrimeFactor, err := parseRSAPrivateKeyParamFromMap(jwk, "p")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
-	}
-	secondPrimeFactor, err := parseRSAPrivateKeyParamFromMap(jwk, "q")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
-	}
-	firstFactorCRT, err := parseRSAPrivateKeyParamFromMap(jwk, "dp")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
-	}
-	secondFactorCRT, err := parseRSAPrivateKeyParamFromMap(jwk, "dq")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
-	}
-	crtCoeff, err := parseRSAPrivateKeyParamFromMap(jwk, "qi")
-	if err != nil {
-		return nil, fmt.Errorf("JWK RSA Private Key CRT coefficient: %s", err)
-	}
-
-	var oth interface{}
-	if _, ok := jwk["oth"]; ok {
-		oth = jwk["oth"]
-		delete(jwk, "oth")
-	}
-
-	// JWK key type (kty) has already been determined to be "RSA".
-	// Need to extract the public key information, then extract the private
-	// key values.
-	publicKey, err := rsaPublicKeyFromMap(jwk)
-	if err != nil {
-		return nil, err
-	}
-
-	privateKey := &rsa.PrivateKey{
-		PublicKey: *publicKey.PublicKey,
-		D:         privateExponent,
-		Primes:    []*big.Int{firstPrimeFactor, secondPrimeFactor},
-		Precomputed: rsa.PrecomputedValues{
-			Dp:   firstFactorCRT,
-			Dq:   secondFactorCRT,
-			Qinv: crtCoeff,
-		},
-	}
-
-	if oth != nil {
-		// Should be an array of more JSON objects.
-		otherPrimesInfo, ok := oth.([]interface{})
-		if !ok {
-			return nil, errors.New("JWK RSA Private Key: Invalid other primes info: must be an array")
-		}
-		numOtherPrimeFactors := len(otherPrimesInfo)
-		if numOtherPrimeFactors == 0 {
-			return nil, errors.New("JWK RSA Privake Key: Invalid other primes info: must be absent or non-empty")
-		}
-		otherPrimeFactors := make([]*big.Int, numOtherPrimeFactors)
-		productOfPrimes := new(big.Int).Mul(firstPrimeFactor, secondPrimeFactor)
-		crtValues := make([]rsa.CRTValue, numOtherPrimeFactors)
-
-		for i, val := range otherPrimesInfo {
-			otherPrimeinfo, ok := val.(map[string]interface{})
-			if !ok {
-				return nil, errors.New("JWK RSA Private Key: Invalid other prime info: must be a JSON object")
-			}
-
-			otherPrimeFactor, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "r")
-			if err != nil {
-				return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
-			}
-			otherFactorCRT, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "d")
-			if err != nil {
-				return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
-			}
-			otherCrtCoeff, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "t")
-			if err != nil {
-				return nil, fmt.Errorf("JWK RSA Private Key CRT coefficient: %s", err)
-			}
-
-			crtValue := crtValues[i]
-			crtValue.Exp = otherFactorCRT
-			crtValue.Coeff = otherCrtCoeff
-			crtValue.R = productOfPrimes
-			otherPrimeFactors[i] = otherPrimeFactor
-			productOfPrimes = new(big.Int).Mul(productOfPrimes, otherPrimeFactor)
-		}
-
-		privateKey.Primes = append(privateKey.Primes, otherPrimeFactors...)
-		privateKey.Precomputed.CRTValues = crtValues
-	}
-
-	key := &rsaPrivateKey{
-		rsaPublicKey: *publicKey,
-		PrivateKey:   privateKey,
-	}
-
-	return key, nil
-}
-
-/*
- *	Key Generation Functions.
- */
-
-func generateRSAPrivateKey(bits int) (k *rsaPrivateKey, err error) {
-	k = new(rsaPrivateKey)
-	k.PrivateKey, err = rsa.GenerateKey(rand.Reader, bits)
-	if err != nil {
-		return nil, err
-	}
-
-	k.rsaPublicKey.PublicKey = &k.PrivateKey.PublicKey
-	k.extended = make(map[string]interface{})
-
-	return
-}
-
-// GenerateRSA2048PrivateKey generates a key pair using 2048-bit RSA.
-func GenerateRSA2048PrivateKey() (PrivateKey, error) {
-	k, err := generateRSAPrivateKey(2048)
-	if err != nil {
-		return nil, fmt.Errorf("error generating RSA 2048-bit key: %s", err)
-	}
-
-	return k, nil
-}
-
-// GenerateRSA3072PrivateKey generates a key pair using 3072-bit RSA.
-func GenerateRSA3072PrivateKey() (PrivateKey, error) {
-	k, err := generateRSAPrivateKey(3072)
-	if err != nil {
-		return nil, fmt.Errorf("error generating RSA 3072-bit key: %s", err)
-	}
-
-	return k, nil
-}
-
-// GenerateRSA4096PrivateKey generates a key pair using 4096-bit RSA.
-func GenerateRSA4096PrivateKey() (PrivateKey, error) {
-	k, err := generateRSAPrivateKey(4096)
-	if err != nil {
-		return nil, fmt.Errorf("error generating RSA 4096-bit key: %s", err)
-	}
-
-	return k, nil
-}

vendor/github.com/docker/libtrust/util.go

@@ -1,361 +0,0 @@
-package libtrust
-
-import (
-	"bytes"
-	"crypto"
-	"crypto/elliptic"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base32"
-	"encoding/base64"
-	"encoding/binary"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"math/big"
-	"net/url"
-	"os"
-	"path/filepath"
-	"strings"
-	"time"
-)
-
-// LoadOrCreateTrustKey will load a PrivateKey from the specified path
-func LoadOrCreateTrustKey(trustKeyPath string) (PrivateKey, error) {
-	if err := os.MkdirAll(filepath.Dir(trustKeyPath), 0700); err != nil {
-		return nil, err
-	}
-
-	trustKey, err := LoadKeyFile(trustKeyPath)
-	if err == ErrKeyFileDoesNotExist {
-		trustKey, err = GenerateECP256PrivateKey()
-		if err != nil {
-			return nil, fmt.Errorf("error generating key: %s", err)
-		}
-
-		if err := SaveKey(trustKeyPath, trustKey); err != nil {
-			return nil, fmt.Errorf("error saving key file: %s", err)
-		}
-
-		dir, file := filepath.Split(trustKeyPath)
-		if err := SavePublicKey(filepath.Join(dir, "public-"+file), trustKey.PublicKey()); err != nil {
-			return nil, fmt.Errorf("error saving public key file: %s", err)
-		}
-	} else if err != nil {
-		return nil, fmt.Errorf("error loading key file: %s", err)
-	}
-	return trustKey, nil
-}
-
-// NewIdentityAuthTLSClientConfig returns a tls.Config configured to use identity
-// based authentication from the specified dockerUrl, the rootConfigPath and
-// the server name to which it is connecting.
-// If trustUnknownHosts is true it will automatically add the host to the
-// known-hosts.json in rootConfigPath.
-func NewIdentityAuthTLSClientConfig(dockerUrl string, trustUnknownHosts bool, rootConfigPath string, serverName string) (*tls.Config, error) {
-	tlsConfig := newTLSConfig()
-
-	trustKeyPath := filepath.Join(rootConfigPath, "key.json")
-	knownHostsPath := filepath.Join(rootConfigPath, "known-hosts.json")
-
-	u, err := url.Parse(dockerUrl)
-	if err != nil {
-		return nil, fmt.Errorf("unable to parse machine url")
-	}
-
-	if u.Scheme == "unix" {
-		return nil, nil
-	}
-
-	addr := u.Host
-	proto := "tcp"
-
-	trustKey, err := LoadOrCreateTrustKey(trustKeyPath)
-	if err != nil {
-		return nil, fmt.Errorf("unable to load trust key: %s", err)
-	}
-
-	knownHosts, err := LoadKeySetFile(knownHostsPath)
-	if err != nil {
-		return nil, fmt.Errorf("could not load trusted hosts file: %s", err)
-	}
-
-	allowedHosts, err := FilterByHosts(knownHosts, addr, false)
-	if err != nil {
-		return nil, fmt.Errorf("error filtering hosts: %s", err)
-	}
-
-	certPool, err := GenerateCACertPool(trustKey, allowedHosts)
-	if err != nil {
-		return nil, fmt.Errorf("Could not create CA pool: %s", err)
-	}
-
-	tlsConfig.ServerName = serverName
-	tlsConfig.RootCAs = certPool
-
-	x509Cert, err := GenerateSelfSignedClientCert(trustKey)
-	if err != nil {
-		return nil, fmt.Errorf("certificate generation error: %s", err)
-	}
-
-	tlsConfig.Certificates = []tls.Certificate{{
-		Certificate: [][]byte{x509Cert.Raw},
-		PrivateKey:  trustKey.CryptoPrivateKey(),
-		Leaf:        x509Cert,
-	}}
-
-	tlsConfig.InsecureSkipVerify = true
-
-	testConn, err := tls.Dial(proto, addr, tlsConfig)
-	if err != nil {
-		return nil, fmt.Errorf("tls Handshake error: %s", err)
-	}
-
-	opts := x509.VerifyOptions{
-		Roots:         tlsConfig.RootCAs,
-		CurrentTime:   time.Now(),
-		DNSName:       tlsConfig.ServerName,
-		Intermediates: x509.NewCertPool(),
-	}
-
-	certs := testConn.ConnectionState().PeerCertificates
-	for i, cert := range certs {
-		if i == 0 {
-			continue
-		}
-		opts.Intermediates.AddCert(cert)
-	}
-
-	if _, err := certs[0].Verify(opts); err != nil {
-		if _, ok := err.(x509.UnknownAuthorityError); ok {
-			if trustUnknownHosts {
-				pubKey, err := FromCryptoPublicKey(certs[0].PublicKey)
-				if err != nil {
-					return nil, fmt.Errorf("error extracting public key from cert: %s", err)
-				}
-
-				pubKey.AddExtendedField("hosts", []string{addr})
-
-				if err := AddKeySetFile(knownHostsPath, pubKey); err != nil {
-					return nil, fmt.Errorf("error adding machine to known hosts: %s", err)
-				}
-			} else {
-				return nil, fmt.Errorf("unable to connect.  unknown host: %s", addr)
-			}
-		}
-	}
-
-	testConn.Close()
-	tlsConfig.InsecureSkipVerify = false
-
-	return tlsConfig, nil
-}
-
-// joseBase64UrlEncode encodes the given data using the standard base64 url
-// encoding format but with all trailing '=' characters ommitted in accordance
-// with the jose specification.
-// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
-func joseBase64UrlEncode(b []byte) string {
-	return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
-}
-
-// joseBase64UrlDecode decodes the given string using the standard base64 url
-// decoder but first adds the appropriate number of trailing '=' characters in
-// accordance with the jose specification.
-// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
-func joseBase64UrlDecode(s string) ([]byte, error) {
-	switch len(s) % 4 {
-	case 0:
-	case 2:
-		s += "=="
-	case 3:
-		s += "="
-	default:
-		return nil, errors.New("illegal base64url string")
-	}
-	return base64.URLEncoding.DecodeString(s)
-}
-
-func keyIDEncode(b []byte) string {
-	s := strings.TrimRight(base32.StdEncoding.EncodeToString(b), "=")
-	var buf bytes.Buffer
-	var i int
-	for i = 0; i < len(s)/4-1; i++ {
-		start := i * 4
-		end := start + 4
-		buf.WriteString(s[start:end] + ":")
-	}
-	buf.WriteString(s[i*4:])
-	return buf.String()
-}
-
-func keyIDFromCryptoKey(pubKey PublicKey) string {
-	// Generate and return a 'libtrust' fingerprint of the public key.
-	// For an RSA key this should be:
-	//   SHA256(DER encoded ASN1)
-	// Then truncated to 240 bits and encoded into 12 base32 groups like so:
-	//   ABCD:EFGH:IJKL:MNOP:QRST:UVWX:YZ23:4567:ABCD:EFGH:IJKL:MNOP
-	derBytes, err := x509.MarshalPKIXPublicKey(pubKey.CryptoPublicKey())
-	if err != nil {
-		return ""
-	}
-	hasher := crypto.SHA256.New()
-	hasher.Write(derBytes)
-	return keyIDEncode(hasher.Sum(nil)[:30])
-}
-
-func stringFromMap(m map[string]interface{}, key string) (string, error) {
-	val, ok := m[key]
-	if !ok {
-		return "", fmt.Errorf("%q value not specified", key)
-	}
-
-	str, ok := val.(string)
-	if !ok {
-		return "", fmt.Errorf("%q value must be a string", key)
-	}
-	delete(m, key)
-
-	return str, nil
-}
-
-func parseECCoordinate(cB64Url string, curve elliptic.Curve) (*big.Int, error) {
-	curveByteLen := (curve.Params().BitSize + 7) >> 3
-
-	cBytes, err := joseBase64UrlDecode(cB64Url)
-	if err != nil {
-		return nil, fmt.Errorf("invalid base64 URL encoding: %s", err)
-	}
-	cByteLength := len(cBytes)
-	if cByteLength != curveByteLen {
-		return nil, fmt.Errorf("invalid number of octets: got %d, should be %d", cByteLength, curveByteLen)
-	}
-	return new(big.Int).SetBytes(cBytes), nil
-}
-
-func parseECPrivateParam(dB64Url string, curve elliptic.Curve) (*big.Int, error) {
-	dBytes, err := joseBase64UrlDecode(dB64Url)
-	if err != nil {
-		return nil, fmt.Errorf("invalid base64 URL encoding: %s", err)
-	}
-
-	// The length of this octet string MUST be ceiling(log-base-2(n)/8)
-	// octets (where n is the order of the curve). This is because the private
-	// key d must be in the interval [1, n-1] so the bitlength of d should be
-	// no larger than the bitlength of n-1. The easiest way to find the octet
-	// length is to take bitlength(n-1), add 7 to force a carry, and shift this
-	// bit sequence right by 3, which is essentially dividing by 8 and adding
-	// 1 if there is any remainder. Thus, the private key value d should be
-	// output to (bitlength(n-1)+7)>>3 octets.
-	n := curve.Params().N
-	octetLength := (new(big.Int).Sub(n, big.NewInt(1)).BitLen() + 7) >> 3
-	dByteLength := len(dBytes)
-
-	if dByteLength != octetLength {
-		return nil, fmt.Errorf("invalid number of octets: got %d, should be %d", dByteLength, octetLength)
-	}
-
-	return new(big.Int).SetBytes(dBytes), nil
-}
-
-func parseRSAModulusParam(nB64Url string) (*big.Int, error) {
-	nBytes, err := joseBase64UrlDecode(nB64Url)
-	if err != nil {
-		return nil, fmt.Errorf("invalid base64 URL encoding: %s", err)
-	}
-
-	return new(big.Int).SetBytes(nBytes), nil
-}
-
-func serializeRSAPublicExponentParam(e int) []byte {
-	// We MUST use the minimum number of octets to represent E.
-	// E is supposed to be 65537 for performance and security reasons
-	// and is what golang's rsa package generates, but it might be
-	// different if imported from some other generator.
-	buf := make([]byte, 4)
-	binary.BigEndian.PutUint32(buf, uint32(e))
-	var i int
-	for i = 0; i < 8; i++ {
-		if buf[i] != 0 {
-			break
-		}
-	}
-	return buf[i:]
-}
-
-func parseRSAPublicExponentParam(eB64Url string) (int, error) {
-	eBytes, err := joseBase64UrlDecode(eB64Url)
-	if err != nil {
-		return 0, fmt.Errorf("invalid base64 URL encoding: %s", err)
-	}
-	// Only the minimum number of bytes were used to represent E, but
-	// binary.BigEndian.Uint32 expects at least 4 bytes, so we need
-	// to add zero padding if necassary.
-	byteLen := len(eBytes)
-	buf := make([]byte, 4-byteLen, 4)
-	eBytes = append(buf, eBytes...)
-
-	return int(binary.BigEndian.Uint32(eBytes)), nil
-}
-
-func parseRSAPrivateKeyParamFromMap(m map[string]interface{}, key string) (*big.Int, error) {
-	b64Url, err := stringFromMap(m, key)
-	if err != nil {
-		return nil, err
-	}
-
-	paramBytes, err := joseBase64UrlDecode(b64Url)
-	if err != nil {
-		return nil, fmt.Errorf("invaled base64 URL encoding: %s", err)
-	}
-
-	return new(big.Int).SetBytes(paramBytes), nil
-}
-
-func createPemBlock(name string, derBytes []byte, headers map[string]interface{}) (*pem.Block, error) {
-	pemBlock := &pem.Block{Type: name, Bytes: derBytes, Headers: map[string]string{}}
-	for k, v := range headers {
-		switch val := v.(type) {
-		case string:
-			pemBlock.Headers[k] = val
-		case []string:
-			if k == "hosts" {
-				pemBlock.Headers[k] = strings.Join(val, ",")
-			} else {
-				// Return error, non-encodable type
-			}
-		default:
-			// Return error, non-encodable type
-		}
-	}
-
-	return pemBlock, nil
-}
-
-func pubKeyFromPEMBlock(pemBlock *pem.Block) (PublicKey, error) {
-	cryptoPublicKey, err := x509.ParsePKIXPublicKey(pemBlock.Bytes)
-	if err != nil {
-		return nil, fmt.Errorf("unable to decode Public Key PEM data: %s", err)
-	}
-
-	pubKey, err := FromCryptoPublicKey(cryptoPublicKey)
-	if err != nil {
-		return nil, err
-	}
-
-	addPEMHeadersToKey(pemBlock, pubKey)
-
-	return pubKey, nil
-}
-
-func addPEMHeadersToKey(pemBlock *pem.Block, pubKey PublicKey) {
-	for key, value := range pemBlock.Headers {
-		var safeVal interface{}
-		if key == "hosts" {
-			safeVal = strings.Split(value, ",")
-		} else {
-			safeVal = value
-		}
-		pubKey.AddExtendedField(key, safeVal)
-	}
-}

vendor/github.com/go-jose/go-jose/v3/.gitignore

@@ -0,0 +1,2 @@
+jose-util/jose-util
+jose-util.t.err

vendor/github.com/go-jose/go-jose/v3/.golangci.yml

@@ -0,0 +1,53 @@
+# https://github.com/golangci/golangci-lint
+
+run:
+  skip-files:
+    - doc_test.go
+  modules-download-mode: readonly
+
+linters:
+  enable-all: true
+  disable:
+    - gochecknoglobals
+    - goconst
+    - lll
+    - maligned
+    - nakedret
+    - scopelint
+    - unparam
+    - funlen # added in 1.18 (requires go-jose changes before it can be enabled)
+
+linters-settings:
+  gocyclo:
+    min-complexity: 35
+
+issues:
+  exclude-rules:
+    - text: "don't use ALL_CAPS in Go names"
+      linters:
+        - golint
+    - text: "hardcoded credentials"
+      linters:
+        - gosec
+    - text: "weak cryptographic primitive"
+      linters:
+        - gosec
+    - path: json/
+      linters:
+        - dupl
+        - errcheck
+        - gocritic
+        - gocyclo
+        - golint
+        - govet
+        - ineffassign
+        - staticcheck
+        - structcheck
+        - stylecheck
+        - unused
+    - path: _test\.go
+      linters:
+        - scopelint
+    - path: jwk.go
+      linters:
+        - gocyclo

vendor/github.com/go-jose/go-jose/v3/.travis.yml

@@ -0,0 +1,33 @@
+language: go
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
+
+go:
+  - "1.13.x"
+  - "1.14.x"
+  - tip
+
+before_script:
+  - export PATH=$HOME/.local/bin:$PATH
+
+before_install:
+  - go get -u github.com/mattn/goveralls github.com/wadey/gocovmerge
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.18.0
+  - pip install cram --user
+
+script:
+  - go test -v -covermode=count -coverprofile=profile.cov .
+  - go test -v -covermode=count -coverprofile=cryptosigner/profile.cov ./cryptosigner
+  - go test -v -covermode=count -coverprofile=cipher/profile.cov ./cipher
+  - go test -v -covermode=count -coverprofile=jwt/profile.cov ./jwt
+  - go test -v ./json  # no coverage for forked encoding/json package
+  - golangci-lint run
+  - cd jose-util && go build && PATH=$PWD:$PATH cram -v jose-util.t # cram tests jose-util
+  - cd ..
+
+after_success:
+  - gocovmerge *.cov */*.cov > merged.coverprofile
+  - goveralls -coverprofile merged.coverprofile -service=travis-ci

vendor/github.com/go-jose/go-jose/v3/BUG-BOUNTY.md

@@ -0,0 +1,10 @@
+Serious about security
+======================
+
+Square recognizes the important contributions the security research community
+can make. We therefore encourage reporting security issues with the code
+contained in this repository.
+
+If you believe you have discovered a security vulnerability, please follow the
+guidelines at <https://bugcrowd.com/squareopensource>.
+

vendor/github.com/go-jose/go-jose/v3/CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contributing
+
+If you would like to contribute code to go-jose you can do so through GitHub by
+forking the repository and sending a pull request.
+
+When submitting code, please make every effort to follow existing conventions
+and style in order to keep the code as readable as possible. Please also make
+sure all tests pass by running `go test`, and format your code with `go fmt`.
+We also recommend using `golint` and `errcheck`.
+
+Before your code can be accepted into the project you must also sign the
+Individual Contributor License Agreement.  We use [cla-assistant.io][1] and you
+will be prompted to sign once a pull request is opened.
+
+[1]: https://cla-assistant.io/

vendor/github.com/go-jose/go-jose/v3/LICENSE

@@ -176,7 +176,18 @@
 
    END OF TERMS AND CONDITIONS
 
-   Copyright 2014 Docker, Inc.
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

vendor/github.com/go-jose/go-jose/v3/README.md

@@ -0,0 +1,122 @@
+# Go JOSE
+
+[![godoc](http://img.shields.io/badge/godoc-jose_package-blue.svg?style=flat)](https://godoc.org/gopkg.in/go-jose/go-jose.v2)
+[![godoc](http://img.shields.io/badge/godoc-jwt_package-blue.svg?style=flat)](https://godoc.org/gopkg.in/go-jose/go-jose.v2/jwt)
+[![license](http://img.shields.io/badge/license-apache_2.0-blue.svg?style=flat)](https://raw.githubusercontent.com/go-jose/go-jose/master/LICENSE)
+[![build](https://travis-ci.org/go-jose/go-jose.svg?branch=master)](https://travis-ci.org/go-jose/go-jose)
+[![coverage](https://coveralls.io/repos/github/go-jose/go-jose/badge.svg?branch=master)](https://coveralls.io/r/go-jose/go-jose)
+
+Package jose aims to provide an implementation of the Javascript Object Signing
+and Encryption set of standards. This includes support for JSON Web Encryption,
+JSON Web Signature, and JSON Web Token standards.
+
+**Disclaimer**: This library contains encryption software that is subject to
+the U.S. Export Administration Regulations. You may not export, re-export,
+transfer or download this code or any part of it in violation of any United
+States law, directive or regulation. In particular this software may not be
+exported or re-exported in any form or on any media to Iran, North Sudan,
+Syria, Cuba, or North Korea, or to denied persons or entities mentioned on any
+US maintained blocked list.
+
+## Overview
+
+The implementation follows the
+[JSON Web Encryption](http://dx.doi.org/10.17487/RFC7516) (RFC 7516),
+[JSON Web Signature](http://dx.doi.org/10.17487/RFC7515) (RFC 7515), and
+[JSON Web Token](http://dx.doi.org/10.17487/RFC7519) (RFC 7519) specifications.
+Tables of supported algorithms are shown below. The library supports both
+the compact and JWS/JWE JSON Serialization formats, and has optional support for
+multiple recipients. It also comes with a small command-line utility
+([`jose-util`](https://github.com/go-jose/go-jose/tree/master/jose-util))
+for dealing with JOSE messages in a shell.
+
+**Note**: We use a forked version of the `encoding/json` package from the Go
+standard library which uses case-sensitive matching for member names (instead
+of [case-insensitive matching](https://www.ietf.org/mail-archive/web/json/current/msg03763.html)).
+This is to avoid differences in interpretation of messages between go-jose and
+libraries in other languages.
+
+### Versions
+
+[Version 2](https://gopkg.in/go-jose/go-jose.v2)
+([branch](https://github.com/go-jose/go-jose/tree/v2),
+[doc](https://godoc.org/gopkg.in/go-jose/go-jose.v2)) is the current stable version:
+
+    import "gopkg.in/go-jose/go-jose.v2"
+
+[Version 3](https://github.com/go-jose/go-jose)
+([branch](https://github.com/go-jose/go-jose/tree/master),
+[doc](https://godoc.org/github.com/go-jose/go-jose)) is the under development/unstable version (not released yet):
+
+    import "github.com/go-jose/go-jose/v3"
+
+All new feature development takes place on the `master` branch, which we are
+preparing to release as version 3 soon. Version 2 will continue to receive
+critical bug and security fixes. Note that starting with version 3 we are
+using Go modules for versioning instead of `gopkg.in` as before. Version 3 also will require Go version 1.13 or higher.
+
+Version 1 (on the `v1` branch) is frozen and not supported anymore.
+
+### Supported algorithms
+
+See below for a table of supported algorithms. Algorithm identifiers match
+the names in the [JSON Web Algorithms](http://dx.doi.org/10.17487/RFC7518)
+standard where possible. The Godoc reference has a list of constants.
+
+ Key encryption             | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ RSA-PKCS#1v1.5             | RSA1_5
+ RSA-OAEP                   | RSA-OAEP, RSA-OAEP-256
+ AES key wrap               | A128KW, A192KW, A256KW
+ AES-GCM key wrap           | A128GCMKW, A192GCMKW, A256GCMKW
+ ECDH-ES + AES key wrap     | ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW
+ ECDH-ES (direct)           | ECDH-ES<sup>1</sup>
+ Direct encryption          | dir<sup>1</sup>
+
+<sup>1. Not supported in multi-recipient mode</sup>
+
+ Signing / MAC              | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ RSASSA-PKCS#1v1.5          | RS256, RS384, RS512
+ RSASSA-PSS                 | PS256, PS384, PS512
+ HMAC                       | HS256, HS384, HS512
+ ECDSA                      | ES256, ES384, ES512
+ Ed25519                    | EdDSA<sup>2</sup>
+
+<sup>2. Only available in version 2 of the package</sup>
+
+ Content encryption         | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ AES-CBC+HMAC               | A128CBC-HS256, A192CBC-HS384, A256CBC-HS512
+ AES-GCM                    | A128GCM, A192GCM, A256GCM
+
+ Compression                | Algorithm identifiers(s)
+ :------------------------- | -------------------------------
+ DEFLATE (RFC 1951)         | DEF
+
+### Supported key types
+
+See below for a table of supported key types. These are understood by the
+library, and can be passed to corresponding functions such as `NewEncrypter` or
+`NewSigner`. Each of these keys can also be wrapped in a JWK if desired, which
+allows attaching a key id.
+
+ Algorithm(s)               | Corresponding types
+ :------------------------- | -------------------------------
+ RSA                        | *[rsa.PublicKey](http://golang.org/pkg/crypto/rsa/#PublicKey), *[rsa.PrivateKey](http://golang.org/pkg/crypto/rsa/#PrivateKey)
+ ECDH, ECDSA                | *[ecdsa.PublicKey](http://golang.org/pkg/crypto/ecdsa/#PublicKey), *[ecdsa.PrivateKey](http://golang.org/pkg/crypto/ecdsa/#PrivateKey)
+ EdDSA<sup>1</sup>          | [ed25519.PublicKey](https://godoc.org/pkg/crypto/ed25519#PublicKey), [ed25519.PrivateKey](https://godoc.org/pkg/crypto/ed25519#PrivateKey)
+ AES, HMAC                  | []byte
+
+<sup>1. Only available in version 2 or later of the package</sup>
+
+## Examples
+
+[![godoc](http://img.shields.io/badge/godoc-jose_package-blue.svg?style=flat)](https://godoc.org/gopkg.in/go-jose/go-jose.v2)
+[![godoc](http://img.shields.io/badge/godoc-jwt_package-blue.svg?style=flat)](https://godoc.org/gopkg.in/go-jose/go-jose.v2/jwt)
+
+Examples can be found in the Godoc
+reference for this package. The
+[`jose-util`](https://github.com/go-jose/go-jose/tree/master/jose-util)
+subdirectory also contains a small command-line utility which might be useful
+as an example as well.

vendor/github.com/go-jose/go-jose/v3/asymmetric.go

@@ -0,0 +1,592 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto"
+	"crypto/aes"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/sha256"
+	"errors"
+	"fmt"
+	"math/big"
+
+	josecipher "github.com/go-jose/go-jose/v3/cipher"
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// A generic RSA-based encrypter/verifier
+type rsaEncrypterVerifier struct {
+	publicKey *rsa.PublicKey
+}
+
+// A generic RSA-based decrypter/signer
+type rsaDecrypterSigner struct {
+	privateKey *rsa.PrivateKey
+}
+
+// A generic EC-based encrypter/verifier
+type ecEncrypterVerifier struct {
+	publicKey *ecdsa.PublicKey
+}
+
+type edEncrypterVerifier struct {
+	publicKey ed25519.PublicKey
+}
+
+// A key generator for ECDH-ES
+type ecKeyGenerator struct {
+	size      int
+	algID     string
+	publicKey *ecdsa.PublicKey
+}
+
+// A generic EC-based decrypter/signer
+type ecDecrypterSigner struct {
+	privateKey *ecdsa.PrivateKey
+}
+
+type edDecrypterSigner struct {
+	privateKey ed25519.PrivateKey
+}
+
+// newRSARecipient creates recipientKeyInfo based on the given key.
+func newRSARecipient(keyAlg KeyAlgorithm, publicKey *rsa.PublicKey) (recipientKeyInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch keyAlg {
+	case RSA1_5, RSA_OAEP, RSA_OAEP_256:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if publicKey == nil {
+		return recipientKeyInfo{}, errors.New("invalid public key")
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &rsaEncrypterVerifier{
+			publicKey: publicKey,
+		},
+	}, nil
+}
+
+// newRSASigner creates a recipientSigInfo based on the given key.
+func newRSASigner(sigAlg SignatureAlgorithm, privateKey *rsa.PrivateKey) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case RS256, RS384, RS512, PS256, PS384, PS512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if privateKey == nil {
+		return recipientSigInfo{}, errors.New("invalid private key")
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: staticPublicKey(&JSONWebKey{
+			Key: privateKey.Public(),
+		}),
+		signer: &rsaDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
+func newEd25519Signer(sigAlg SignatureAlgorithm, privateKey ed25519.PrivateKey) (recipientSigInfo, error) {
+	if sigAlg != EdDSA {
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if privateKey == nil {
+		return recipientSigInfo{}, errors.New("invalid private key")
+	}
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: staticPublicKey(&JSONWebKey{
+			Key: privateKey.Public(),
+		}),
+		signer: &edDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
+// newECDHRecipient creates recipientKeyInfo based on the given key.
+func newECDHRecipient(keyAlg KeyAlgorithm, publicKey *ecdsa.PublicKey) (recipientKeyInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch keyAlg {
+	case ECDH_ES, ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if publicKey == nil || !publicKey.Curve.IsOnCurve(publicKey.X, publicKey.Y) {
+		return recipientKeyInfo{}, errors.New("invalid public key")
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &ecEncrypterVerifier{
+			publicKey: publicKey,
+		},
+	}, nil
+}
+
+// newECDSASigner creates a recipientSigInfo based on the given key.
+func newECDSASigner(sigAlg SignatureAlgorithm, privateKey *ecdsa.PrivateKey) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case ES256, ES384, ES512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if privateKey == nil {
+		return recipientSigInfo{}, errors.New("invalid private key")
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: staticPublicKey(&JSONWebKey{
+			Key: privateKey.Public(),
+		}),
+		signer: &ecDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
+// Encrypt the given payload and update the object.
+func (ctx rsaEncrypterVerifier) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	encryptedKey, err := ctx.encrypt(cek, alg)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	return recipientInfo{
+		encryptedKey: encryptedKey,
+		header:       &rawHeader{},
+	}, nil
+}
+
+// Encrypt the given payload. Based on the key encryption algorithm,
+// this will either use RSA-PKCS1v1.5 or RSA-OAEP (with SHA-1 or SHA-256).
+func (ctx rsaEncrypterVerifier) encrypt(cek []byte, alg KeyAlgorithm) ([]byte, error) {
+	switch alg {
+	case RSA1_5:
+		return rsa.EncryptPKCS1v15(RandReader, ctx.publicKey, cek)
+	case RSA_OAEP:
+		return rsa.EncryptOAEP(sha1.New(), RandReader, ctx.publicKey, cek, []byte{})
+	case RSA_OAEP_256:
+		return rsa.EncryptOAEP(sha256.New(), RandReader, ctx.publicKey, cek, []byte{})
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Decrypt the given payload and return the content encryption key.
+func (ctx rsaDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	return ctx.decrypt(recipient.encryptedKey, headers.getAlgorithm(), generator)
+}
+
+// Decrypt the given payload. Based on the key encryption algorithm,
+// this will either use RSA-PKCS1v1.5 or RSA-OAEP (with SHA-1 or SHA-256).
+func (ctx rsaDecrypterSigner) decrypt(jek []byte, alg KeyAlgorithm, generator keyGenerator) ([]byte, error) {
+	// Note: The random reader on decrypt operations is only used for blinding,
+	// so stubbing is meanlingless (hence the direct use of rand.Reader).
+	switch alg {
+	case RSA1_5:
+		defer func() {
+			// DecryptPKCS1v15SessionKey sometimes panics on an invalid payload
+			// because of an index out of bounds error, which we want to ignore.
+			// This has been fixed in Go 1.3.1 (released 2014/08/13), the recover()
+			// only exists for preventing crashes with unpatched versions.
+			// See: https://groups.google.com/forum/#!topic/golang-dev/7ihX6Y6kx9k
+			// See: https://code.google.com/p/go/source/detail?r=58ee390ff31602edb66af41ed10901ec95904d33
+			_ = recover()
+		}()
+
+		// Perform some input validation.
+		keyBytes := ctx.privateKey.PublicKey.N.BitLen() / 8
+		if keyBytes != len(jek) {
+			// Input size is incorrect, the encrypted payload should always match
+			// the size of the public modulus (e.g. using a 2048 bit key will
+			// produce 256 bytes of output). Reject this since it's invalid input.
+			return nil, ErrCryptoFailure
+		}
+
+		cek, _, err := generator.genKey()
+		if err != nil {
+			return nil, ErrCryptoFailure
+		}
+
+		// When decrypting an RSA-PKCS1v1.5 payload, we must take precautions to
+		// prevent chosen-ciphertext attacks as described in RFC 3218, "Preventing
+		// the Million Message Attack on Cryptographic Message Syntax". We are
+		// therefore deliberately ignoring errors here.
+		_ = rsa.DecryptPKCS1v15SessionKey(rand.Reader, ctx.privateKey, jek, cek)
+
+		return cek, nil
+	case RSA_OAEP:
+		// Use rand.Reader for RSA blinding
+		return rsa.DecryptOAEP(sha1.New(), rand.Reader, ctx.privateKey, jek, []byte{})
+	case RSA_OAEP_256:
+		// Use rand.Reader for RSA blinding
+		return rsa.DecryptOAEP(sha256.New(), rand.Reader, ctx.privateKey, jek, []byte{})
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Sign the given payload
+func (ctx rsaDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	var hash crypto.Hash
+
+	switch alg {
+	case RS256, PS256:
+		hash = crypto.SHA256
+	case RS384, PS384:
+		hash = crypto.SHA384
+	case RS512, PS512:
+		hash = crypto.SHA512
+	default:
+		return Signature{}, ErrUnsupportedAlgorithm
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	var out []byte
+	var err error
+
+	switch alg {
+	case RS256, RS384, RS512:
+		out, err = rsa.SignPKCS1v15(RandReader, ctx.privateKey, hash, hashed)
+	case PS256, PS384, PS512:
+		out, err = rsa.SignPSS(RandReader, ctx.privateKey, hash, hashed, &rsa.PSSOptions{
+			SaltLength: rsa.PSSSaltLengthEqualsHash,
+		})
+	}
+
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx rsaEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	var hash crypto.Hash
+
+	switch alg {
+	case RS256, PS256:
+		hash = crypto.SHA256
+	case RS384, PS384:
+		hash = crypto.SHA384
+	case RS512, PS512:
+		hash = crypto.SHA512
+	default:
+		return ErrUnsupportedAlgorithm
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	switch alg {
+	case RS256, RS384, RS512:
+		return rsa.VerifyPKCS1v15(ctx.publicKey, hash, hashed, signature)
+	case PS256, PS384, PS512:
+		return rsa.VerifyPSS(ctx.publicKey, hash, hashed, signature, nil)
+	}
+
+	return ErrUnsupportedAlgorithm
+}
+
+// Encrypt the given payload and update the object.
+func (ctx ecEncrypterVerifier) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	switch alg {
+	case ECDH_ES:
+		// ECDH-ES mode doesn't wrap a key, the shared secret is used directly as the key.
+		return recipientInfo{
+			header: &rawHeader{},
+		}, nil
+	case ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW:
+	default:
+		return recipientInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	generator := ecKeyGenerator{
+		algID:     string(alg),
+		publicKey: ctx.publicKey,
+	}
+
+	switch alg {
+	case ECDH_ES_A128KW:
+		generator.size = 16
+	case ECDH_ES_A192KW:
+		generator.size = 24
+	case ECDH_ES_A256KW:
+		generator.size = 32
+	}
+
+	kek, header, err := generator.genKey()
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	block, err := aes.NewCipher(kek)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	jek, err := josecipher.KeyWrap(block, cek)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	return recipientInfo{
+		encryptedKey: jek,
+		header:       &header,
+	}, nil
+}
+
+// Get key size for EC key generator
+func (ctx ecKeyGenerator) keySize() int {
+	return ctx.size
+}
+
+// Get a content encryption key for ECDH-ES
+func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	priv, err := ecdsa.GenerateKey(ctx.publicKey.Curve, RandReader)
+	if err != nil {
+		return nil, rawHeader{}, err
+	}
+
+	out := josecipher.DeriveECDHES(ctx.algID, []byte{}, []byte{}, priv, ctx.publicKey, ctx.size)
+
+	b, err := json.Marshal(&JSONWebKey{
+		Key: &priv.PublicKey,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	headers := rawHeader{
+		headerEPK: makeRawMessage(b),
+	}
+
+	return out, headers, nil
+}
+
+// Decrypt the given payload and return the content encryption key.
+func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	epk, err := headers.getEPK()
+	if err != nil {
+		return nil, errors.New("go-jose/go-jose: invalid epk header")
+	}
+	if epk == nil {
+		return nil, errors.New("go-jose/go-jose: missing epk header")
+	}
+
+	publicKey, ok := epk.Key.(*ecdsa.PublicKey)
+	if publicKey == nil || !ok {
+		return nil, errors.New("go-jose/go-jose: invalid epk header")
+	}
+
+	if !ctx.privateKey.Curve.IsOnCurve(publicKey.X, publicKey.Y) {
+		return nil, errors.New("go-jose/go-jose: invalid public key in epk header")
+	}
+
+	apuData, err := headers.getAPU()
+	if err != nil {
+		return nil, errors.New("go-jose/go-jose: invalid apu header")
+	}
+	apvData, err := headers.getAPV()
+	if err != nil {
+		return nil, errors.New("go-jose/go-jose: invalid apv header")
+	}
+
+	deriveKey := func(algID string, size int) []byte {
+		return josecipher.DeriveECDHES(algID, apuData.bytes(), apvData.bytes(), ctx.privateKey, publicKey, size)
+	}
+
+	var keySize int
+
+	algorithm := headers.getAlgorithm()
+	switch algorithm {
+	case ECDH_ES:
+		// ECDH-ES uses direct key agreement, no key unwrapping necessary.
+		return deriveKey(string(headers.getEncryption()), generator.keySize()), nil
+	case ECDH_ES_A128KW:
+		keySize = 16
+	case ECDH_ES_A192KW:
+		keySize = 24
+	case ECDH_ES_A256KW:
+		keySize = 32
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	key := deriveKey(string(algorithm), keySize)
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	return josecipher.KeyUnwrap(block, recipient.encryptedKey)
+}
+
+func (ctx edDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	if alg != EdDSA {
+		return Signature{}, ErrUnsupportedAlgorithm
+	}
+
+	sig, err := ctx.privateKey.Sign(RandReader, payload, crypto.Hash(0))
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: sig,
+		protected: &rawHeader{},
+	}, nil
+}
+
+func (ctx edEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	if alg != EdDSA {
+		return ErrUnsupportedAlgorithm
+	}
+	ok := ed25519.Verify(ctx.publicKey, payload, signature)
+	if !ok {
+		return errors.New("go-jose/go-jose: ed25519 signature failed to verify")
+	}
+	return nil
+}
+
+// Sign the given payload
+func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	var expectedBitSize int
+	var hash crypto.Hash
+
+	switch alg {
+	case ES256:
+		expectedBitSize = 256
+		hash = crypto.SHA256
+	case ES384:
+		expectedBitSize = 384
+		hash = crypto.SHA384
+	case ES512:
+		expectedBitSize = 521
+		hash = crypto.SHA512
+	}
+
+	curveBits := ctx.privateKey.Curve.Params().BitSize
+	if expectedBitSize != curveBits {
+		return Signature{}, fmt.Errorf("go-jose/go-jose: expected %d bit key, got %d bits instead", expectedBitSize, curveBits)
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	r, s, err := ecdsa.Sign(RandReader, ctx.privateKey, hashed)
+	if err != nil {
+		return Signature{}, err
+	}
+
+	keyBytes := curveBits / 8
+	if curveBits%8 > 0 {
+		keyBytes++
+	}
+
+	// We serialize the outputs (r and s) into big-endian byte arrays and pad
+	// them with zeros on the left to make sure the sizes work out. Both arrays
+	// must be keyBytes long, and the output must be 2*keyBytes long.
+	rBytes := r.Bytes()
+	rBytesPadded := make([]byte, keyBytes)
+	copy(rBytesPadded[keyBytes-len(rBytes):], rBytes)
+
+	sBytes := s.Bytes()
+	sBytesPadded := make([]byte, keyBytes)
+	copy(sBytesPadded[keyBytes-len(sBytes):], sBytes)
+
+	out := append(rBytesPadded, sBytesPadded...)
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx ecEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	var keySize int
+	var hash crypto.Hash
+
+	switch alg {
+	case ES256:
+		keySize = 32
+		hash = crypto.SHA256
+	case ES384:
+		keySize = 48
+		hash = crypto.SHA384
+	case ES512:
+		keySize = 66
+		hash = crypto.SHA512
+	default:
+		return ErrUnsupportedAlgorithm
+	}
+
+	if len(signature) != 2*keySize {
+		return fmt.Errorf("go-jose/go-jose: invalid signature size, have %d bytes, wanted %d", len(signature), 2*keySize)
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	r := big.NewInt(0).SetBytes(signature[:keySize])
+	s := big.NewInt(0).SetBytes(signature[keySize:])
+
+	match := ecdsa.Verify(ctx.publicKey, hashed, r, s)
+	if !match {
+		return errors.New("go-jose/go-jose: ecdsa signature failed to verify")
+	}
+
+	return nil
+}

vendor/github.com/go-jose/go-jose/v3/cipher/cbc_hmac.go

@@ -0,0 +1,196 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/sha256"
+	"crypto/sha512"
+	"crypto/subtle"
+	"encoding/binary"
+	"errors"
+	"hash"
+)
+
+const (
+	nonceBytes = 16
+)
+
+// NewCBCHMAC instantiates a new AEAD based on CBC+HMAC.
+func NewCBCHMAC(key []byte, newBlockCipher func([]byte) (cipher.Block, error)) (cipher.AEAD, error) {
+	keySize := len(key) / 2
+	integrityKey := key[:keySize]
+	encryptionKey := key[keySize:]
+
+	blockCipher, err := newBlockCipher(encryptionKey)
+	if err != nil {
+		return nil, err
+	}
+
+	var hash func() hash.Hash
+	switch keySize {
+	case 16:
+		hash = sha256.New
+	case 24:
+		hash = sha512.New384
+	case 32:
+		hash = sha512.New
+	}
+
+	return &cbcAEAD{
+		hash:         hash,
+		blockCipher:  blockCipher,
+		authtagBytes: keySize,
+		integrityKey: integrityKey,
+	}, nil
+}
+
+// An AEAD based on CBC+HMAC
+type cbcAEAD struct {
+	hash         func() hash.Hash
+	authtagBytes int
+	integrityKey []byte
+	blockCipher  cipher.Block
+}
+
+func (ctx *cbcAEAD) NonceSize() int {
+	return nonceBytes
+}
+
+func (ctx *cbcAEAD) Overhead() int {
+	// Maximum overhead is block size (for padding) plus auth tag length, where
+	// the length of the auth tag is equivalent to the key size.
+	return ctx.blockCipher.BlockSize() + ctx.authtagBytes
+}
+
+// Seal encrypts and authenticates the plaintext.
+func (ctx *cbcAEAD) Seal(dst, nonce, plaintext, data []byte) []byte {
+	// Output buffer -- must take care not to mangle plaintext input.
+	ciphertext := make([]byte, uint64(len(plaintext))+uint64(ctx.Overhead()))[:len(plaintext)]
+	copy(ciphertext, plaintext)
+	ciphertext = padBuffer(ciphertext, ctx.blockCipher.BlockSize())
+
+	cbc := cipher.NewCBCEncrypter(ctx.blockCipher, nonce)
+
+	cbc.CryptBlocks(ciphertext, ciphertext)
+	authtag := ctx.computeAuthTag(data, nonce, ciphertext)
+
+	ret, out := resize(dst, uint64(len(dst))+uint64(len(ciphertext))+uint64(len(authtag)))
+	copy(out, ciphertext)
+	copy(out[len(ciphertext):], authtag)
+
+	return ret
+}
+
+// Open decrypts and authenticates the ciphertext.
+func (ctx *cbcAEAD) Open(dst, nonce, ciphertext, data []byte) ([]byte, error) {
+	if len(ciphertext) < ctx.authtagBytes {
+		return nil, errors.New("go-jose/go-jose: invalid ciphertext (too short)")
+	}
+
+	offset := len(ciphertext) - ctx.authtagBytes
+	expectedTag := ctx.computeAuthTag(data, nonce, ciphertext[:offset])
+	match := subtle.ConstantTimeCompare(expectedTag, ciphertext[offset:])
+	if match != 1 {
+		return nil, errors.New("go-jose/go-jose: invalid ciphertext (auth tag mismatch)")
+	}
+
+	cbc := cipher.NewCBCDecrypter(ctx.blockCipher, nonce)
+
+	// Make copy of ciphertext buffer, don't want to modify in place
+	buffer := append([]byte{}, ciphertext[:offset]...)
+
+	if len(buffer)%ctx.blockCipher.BlockSize() > 0 {
+		return nil, errors.New("go-jose/go-jose: invalid ciphertext (invalid length)")
+	}
+
+	cbc.CryptBlocks(buffer, buffer)
+
+	// Remove padding
+	plaintext, err := unpadBuffer(buffer, ctx.blockCipher.BlockSize())
+	if err != nil {
+		return nil, err
+	}
+
+	ret, out := resize(dst, uint64(len(dst))+uint64(len(plaintext)))
+	copy(out, plaintext)
+
+	return ret, nil
+}
+
+// Compute an authentication tag
+func (ctx *cbcAEAD) computeAuthTag(aad, nonce, ciphertext []byte) []byte {
+	buffer := make([]byte, uint64(len(aad))+uint64(len(nonce))+uint64(len(ciphertext))+8)
+	n := 0
+	n += copy(buffer, aad)
+	n += copy(buffer[n:], nonce)
+	n += copy(buffer[n:], ciphertext)
+	binary.BigEndian.PutUint64(buffer[n:], uint64(len(aad))*8)
+
+	// According to documentation, Write() on hash.Hash never fails.
+	hmac := hmac.New(ctx.hash, ctx.integrityKey)
+	_, _ = hmac.Write(buffer)
+
+	return hmac.Sum(nil)[:ctx.authtagBytes]
+}
+
+// resize ensures that the given slice has a capacity of at least n bytes.
+// If the capacity of the slice is less than n, a new slice is allocated
+// and the existing data will be copied.
+func resize(in []byte, n uint64) (head, tail []byte) {
+	if uint64(cap(in)) >= n {
+		head = in[:n]
+	} else {
+		head = make([]byte, n)
+		copy(head, in)
+	}
+
+	tail = head[len(in):]
+	return
+}
+
+// Apply padding
+func padBuffer(buffer []byte, blockSize int) []byte {
+	missing := blockSize - (len(buffer) % blockSize)
+	ret, out := resize(buffer, uint64(len(buffer))+uint64(missing))
+	padding := bytes.Repeat([]byte{byte(missing)}, missing)
+	copy(out, padding)
+	return ret
+}
+
+// Remove padding
+func unpadBuffer(buffer []byte, blockSize int) ([]byte, error) {
+	if len(buffer)%blockSize != 0 {
+		return nil, errors.New("go-jose/go-jose: invalid padding")
+	}
+
+	last := buffer[len(buffer)-1]
+	count := int(last)
+
+	if count == 0 || count > blockSize || count > len(buffer) {
+		return nil, errors.New("go-jose/go-jose: invalid padding")
+	}
+
+	padding := bytes.Repeat([]byte{last}, count)
+	if !bytes.HasSuffix(buffer, padding) {
+		return nil, errors.New("go-jose/go-jose: invalid padding")
+	}
+
+	return buffer[:len(buffer)-count], nil
+}

vendor/github.com/go-jose/go-jose/v3/cipher/concat_kdf.go

@@ -0,0 +1,75 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"crypto"
+	"encoding/binary"
+	"hash"
+	"io"
+)
+
+type concatKDF struct {
+	z, info []byte
+	i       uint32
+	cache   []byte
+	hasher  hash.Hash
+}
+
+// NewConcatKDF builds a KDF reader based on the given inputs.
+func NewConcatKDF(hash crypto.Hash, z, algID, ptyUInfo, ptyVInfo, supPubInfo, supPrivInfo []byte) io.Reader {
+	buffer := make([]byte, uint64(len(algID))+uint64(len(ptyUInfo))+uint64(len(ptyVInfo))+uint64(len(supPubInfo))+uint64(len(supPrivInfo)))
+	n := 0
+	n += copy(buffer, algID)
+	n += copy(buffer[n:], ptyUInfo)
+	n += copy(buffer[n:], ptyVInfo)
+	n += copy(buffer[n:], supPubInfo)
+	copy(buffer[n:], supPrivInfo)
+
+	hasher := hash.New()
+
+	return &concatKDF{
+		z:      z,
+		info:   buffer,
+		hasher: hasher,
+		cache:  []byte{},
+		i:      1,
+	}
+}
+
+func (ctx *concatKDF) Read(out []byte) (int, error) {
+	copied := copy(out, ctx.cache)
+	ctx.cache = ctx.cache[copied:]
+
+	for copied < len(out) {
+		ctx.hasher.Reset()
+
+		// Write on a hash.Hash never fails
+		_ = binary.Write(ctx.hasher, binary.BigEndian, ctx.i)
+		_, _ = ctx.hasher.Write(ctx.z)
+		_, _ = ctx.hasher.Write(ctx.info)
+
+		hash := ctx.hasher.Sum(nil)
+		chunkCopied := copy(out[copied:], hash)
+		copied += chunkCopied
+		ctx.cache = hash[chunkCopied:]
+
+		ctx.i++
+	}
+
+	return copied, nil
+}

vendor/github.com/go-jose/go-jose/v3/cipher/ecdh_es.go

@@ -0,0 +1,86 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"encoding/binary"
+)
+
+// DeriveECDHES derives a shared encryption key using ECDH/ConcatKDF as described in JWE/JWA.
+// It is an error to call this function with a private/public key that are not on the same
+// curve. Callers must ensure that the keys are valid before calling this function. Output
+// size may be at most 1<<16 bytes (64 KiB).
+func DeriveECDHES(alg string, apuData, apvData []byte, priv *ecdsa.PrivateKey, pub *ecdsa.PublicKey, size int) []byte {
+	if size > 1<<16 {
+		panic("ECDH-ES output size too large, must be less than or equal to 1<<16")
+	}
+
+	// algId, partyUInfo, partyVInfo inputs must be prefixed with the length
+	algID := lengthPrefixed([]byte(alg))
+	ptyUInfo := lengthPrefixed(apuData)
+	ptyVInfo := lengthPrefixed(apvData)
+
+	// suppPubInfo is the encoded length of the output size in bits
+	supPubInfo := make([]byte, 4)
+	binary.BigEndian.PutUint32(supPubInfo, uint32(size)*8)
+
+	if !priv.PublicKey.Curve.IsOnCurve(pub.X, pub.Y) {
+		panic("public key not on same curve as private key")
+	}
+
+	z, _ := priv.Curve.ScalarMult(pub.X, pub.Y, priv.D.Bytes())
+	zBytes := z.Bytes()
+
+	// Note that calling z.Bytes() on a big.Int may strip leading zero bytes from
+	// the returned byte array. This can lead to a problem where zBytes will be
+	// shorter than expected which breaks the key derivation. Therefore we must pad
+	// to the full length of the expected coordinate here before calling the KDF.
+	octSize := dSize(priv.Curve)
+	if len(zBytes) != octSize {
+		zBytes = append(bytes.Repeat([]byte{0}, octSize-len(zBytes)), zBytes...)
+	}
+
+	reader := NewConcatKDF(crypto.SHA256, zBytes, algID, ptyUInfo, ptyVInfo, supPubInfo, []byte{})
+	key := make([]byte, size)
+
+	// Read on the KDF will never fail
+	_, _ = reader.Read(key)
+
+	return key
+}
+
+// dSize returns the size in octets for a coordinate on a elliptic curve.
+func dSize(curve elliptic.Curve) int {
+	order := curve.Params().P
+	bitLen := order.BitLen()
+	size := bitLen / 8
+	if bitLen%8 != 0 {
+		size++
+	}
+	return size
+}
+
+func lengthPrefixed(data []byte) []byte {
+	out := make([]byte, len(data)+4)
+	binary.BigEndian.PutUint32(out, uint32(len(data)))
+	copy(out[4:], data)
+	return out
+}

vendor/github.com/go-jose/go-jose/v3/cipher/key_wrap.go

@@ -0,0 +1,109 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"crypto/cipher"
+	"crypto/subtle"
+	"encoding/binary"
+	"errors"
+)
+
+var defaultIV = []byte{0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6}
+
+// KeyWrap implements NIST key wrapping; it wraps a content encryption key (cek) with the given block cipher.
+func KeyWrap(block cipher.Block, cek []byte) ([]byte, error) {
+	if len(cek)%8 != 0 {
+		return nil, errors.New("go-jose/go-jose: key wrap input must be 8 byte blocks")
+	}
+
+	n := len(cek) / 8
+	r := make([][]byte, n)
+
+	for i := range r {
+		r[i] = make([]byte, 8)
+		copy(r[i], cek[i*8:])
+	}
+
+	buffer := make([]byte, 16)
+	tBytes := make([]byte, 8)
+	copy(buffer, defaultIV)
+
+	for t := 0; t < 6*n; t++ {
+		copy(buffer[8:], r[t%n])
+
+		block.Encrypt(buffer, buffer)
+
+		binary.BigEndian.PutUint64(tBytes, uint64(t+1))
+
+		for i := 0; i < 8; i++ {
+			buffer[i] ^= tBytes[i]
+		}
+		copy(r[t%n], buffer[8:])
+	}
+
+	out := make([]byte, (n+1)*8)
+	copy(out, buffer[:8])
+	for i := range r {
+		copy(out[(i+1)*8:], r[i])
+	}
+
+	return out, nil
+}
+
+// KeyUnwrap implements NIST key unwrapping; it unwraps a content encryption key (cek) with the given block cipher.
+func KeyUnwrap(block cipher.Block, ciphertext []byte) ([]byte, error) {
+	if len(ciphertext)%8 != 0 {
+		return nil, errors.New("go-jose/go-jose: key wrap input must be 8 byte blocks")
+	}
+
+	n := (len(ciphertext) / 8) - 1
+	r := make([][]byte, n)
+
+	for i := range r {
+		r[i] = make([]byte, 8)
+		copy(r[i], ciphertext[(i+1)*8:])
+	}
+
+	buffer := make([]byte, 16)
+	tBytes := make([]byte, 8)
+	copy(buffer[:8], ciphertext[:8])
+
+	for t := 6*n - 1; t >= 0; t-- {
+		binary.BigEndian.PutUint64(tBytes, uint64(t+1))
+
+		for i := 0; i < 8; i++ {
+			buffer[i] ^= tBytes[i]
+		}
+		copy(buffer[8:], r[t%n])
+
+		block.Decrypt(buffer, buffer)
+
+		copy(r[t%n], buffer[8:])
+	}
+
+	if subtle.ConstantTimeCompare(buffer[:8], defaultIV) == 0 {
+		return nil, errors.New("go-jose/go-jose: failed to unwrap key")
+	}
+
+	out := make([]byte, n*8)
+	for i := range r {
+		copy(out[i*8:], r[i])
+	}
+
+	return out, nil
+}

vendor/github.com/go-jose/go-jose/v3/crypter.go

@@ -0,0 +1,544 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// Encrypter represents an encrypter which produces an encrypted JWE object.
+type Encrypter interface {
+	Encrypt(plaintext []byte) (*JSONWebEncryption, error)
+	EncryptWithAuthData(plaintext []byte, aad []byte) (*JSONWebEncryption, error)
+	Options() EncrypterOptions
+}
+
+// A generic content cipher
+type contentCipher interface {
+	keySize() int
+	encrypt(cek []byte, aad, plaintext []byte) (*aeadParts, error)
+	decrypt(cek []byte, aad []byte, parts *aeadParts) ([]byte, error)
+}
+
+// A key generator (for generating/getting a CEK)
+type keyGenerator interface {
+	keySize() int
+	genKey() ([]byte, rawHeader, error)
+}
+
+// A generic key encrypter
+type keyEncrypter interface {
+	encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) // Encrypt a key
+}
+
+// A generic key decrypter
+type keyDecrypter interface {
+	decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) // Decrypt a key
+}
+
+// A generic encrypter based on the given key encrypter and content cipher.
+type genericEncrypter struct {
+	contentAlg     ContentEncryption
+	compressionAlg CompressionAlgorithm
+	cipher         contentCipher
+	recipients     []recipientKeyInfo
+	keyGenerator   keyGenerator
+	extraHeaders   map[HeaderKey]interface{}
+}
+
+type recipientKeyInfo struct {
+	keyID        string
+	keyAlg       KeyAlgorithm
+	keyEncrypter keyEncrypter
+}
+
+// EncrypterOptions represents options that can be set on new encrypters.
+type EncrypterOptions struct {
+	Compression CompressionAlgorithm
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (eo *EncrypterOptions) WithHeader(k HeaderKey, v interface{}) *EncrypterOptions {
+	if eo.ExtraHeaders == nil {
+		eo.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	eo.ExtraHeaders[k] = v
+	return eo
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// EncrypterOptions.
+func (eo *EncrypterOptions) WithContentType(contentType ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated EncrypterOptions.
+func (eo *EncrypterOptions) WithType(typ ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderType, typ)
+}
+
+// Recipient represents an algorithm/key to encrypt messages to.
+//
+// PBES2Count and PBES2Salt correspond with the  "p2c" and "p2s" headers used
+// on the password-based encryption algorithms PBES2-HS256+A128KW,
+// PBES2-HS384+A192KW, and PBES2-HS512+A256KW. If they are not provided a safe
+// default of 100000 will be used for the count and a 128-bit random salt will
+// be generated.
+type Recipient struct {
+	Algorithm  KeyAlgorithm
+	Key        interface{}
+	KeyID      string
+	PBES2Count int
+	PBES2Salt  []byte
+}
+
+// NewEncrypter creates an appropriate encrypter based on the key type
+func NewEncrypter(enc ContentEncryption, rcpt Recipient, opts *EncrypterOptions) (Encrypter, error) {
+	encrypter := &genericEncrypter{
+		contentAlg: enc,
+		recipients: []recipientKeyInfo{},
+		cipher:     getContentCipher(enc),
+	}
+	if opts != nil {
+		encrypter.compressionAlg = opts.Compression
+		encrypter.extraHeaders = opts.ExtraHeaders
+	}
+
+	if encrypter.cipher == nil {
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	var keyID string
+	var rawKey interface{}
+	switch encryptionKey := rcpt.Key.(type) {
+	case JSONWebKey:
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
+	case *JSONWebKey:
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
+	case OpaqueKeyEncrypter:
+		keyID, rawKey = encryptionKey.KeyID(), encryptionKey
+	default:
+		rawKey = encryptionKey
+	}
+
+	switch rcpt.Algorithm {
+	case DIRECT:
+		// Direct encryption mode must be treated differently
+		if reflect.TypeOf(rawKey) != reflect.TypeOf([]byte{}) {
+			return nil, ErrUnsupportedKeyType
+		}
+		if encrypter.cipher.keySize() != len(rawKey.([]byte)) {
+			return nil, ErrInvalidKeySize
+		}
+		encrypter.keyGenerator = staticKeyGenerator{
+			key: rawKey.([]byte),
+		}
+		recipientInfo, _ := newSymmetricRecipient(rcpt.Algorithm, rawKey.([]byte))
+		recipientInfo.keyID = keyID
+		if rcpt.KeyID != "" {
+			recipientInfo.keyID = rcpt.KeyID
+		}
+		encrypter.recipients = []recipientKeyInfo{recipientInfo}
+		return encrypter, nil
+	case ECDH_ES:
+		// ECDH-ES (w/o key wrapping) is similar to DIRECT mode
+		typeOf := reflect.TypeOf(rawKey)
+		if typeOf != reflect.TypeOf(&ecdsa.PublicKey{}) {
+			return nil, ErrUnsupportedKeyType
+		}
+		encrypter.keyGenerator = ecKeyGenerator{
+			size:      encrypter.cipher.keySize(),
+			algID:     string(enc),
+			publicKey: rawKey.(*ecdsa.PublicKey),
+		}
+		recipientInfo, _ := newECDHRecipient(rcpt.Algorithm, rawKey.(*ecdsa.PublicKey))
+		recipientInfo.keyID = keyID
+		if rcpt.KeyID != "" {
+			recipientInfo.keyID = rcpt.KeyID
+		}
+		encrypter.recipients = []recipientKeyInfo{recipientInfo}
+		return encrypter, nil
+	default:
+		// Can just add a standard recipient
+		encrypter.keyGenerator = randomKeyGenerator{
+			size: encrypter.cipher.keySize(),
+		}
+		err := encrypter.addRecipient(rcpt)
+		return encrypter, err
+	}
+}
+
+// NewMultiEncrypter creates a multi-encrypter based on the given parameters
+func NewMultiEncrypter(enc ContentEncryption, rcpts []Recipient, opts *EncrypterOptions) (Encrypter, error) {
+	cipher := getContentCipher(enc)
+
+	if cipher == nil {
+		return nil, ErrUnsupportedAlgorithm
+	}
+	if len(rcpts) == 0 {
+		return nil, fmt.Errorf("go-jose/go-jose: recipients is nil or empty")
+	}
+
+	encrypter := &genericEncrypter{
+		contentAlg: enc,
+		recipients: []recipientKeyInfo{},
+		cipher:     cipher,
+		keyGenerator: randomKeyGenerator{
+			size: cipher.keySize(),
+		},
+	}
+
+	if opts != nil {
+		encrypter.compressionAlg = opts.Compression
+		encrypter.extraHeaders = opts.ExtraHeaders
+	}
+
+	for _, recipient := range rcpts {
+		err := encrypter.addRecipient(recipient)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return encrypter, nil
+}
+
+func (ctx *genericEncrypter) addRecipient(recipient Recipient) (err error) {
+	var recipientInfo recipientKeyInfo
+
+	switch recipient.Algorithm {
+	case DIRECT, ECDH_ES:
+		return fmt.Errorf("go-jose/go-jose: key algorithm '%s' not supported in multi-recipient mode", recipient.Algorithm)
+	}
+
+	recipientInfo, err = makeJWERecipient(recipient.Algorithm, recipient.Key)
+	if recipient.KeyID != "" {
+		recipientInfo.keyID = recipient.KeyID
+	}
+
+	switch recipient.Algorithm {
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		if sr, ok := recipientInfo.keyEncrypter.(*symmetricKeyCipher); ok {
+			sr.p2c = recipient.PBES2Count
+			sr.p2s = recipient.PBES2Salt
+		}
+	}
+
+	if err == nil {
+		ctx.recipients = append(ctx.recipients, recipientInfo)
+	}
+	return err
+}
+
+func makeJWERecipient(alg KeyAlgorithm, encryptionKey interface{}) (recipientKeyInfo, error) {
+	switch encryptionKey := encryptionKey.(type) {
+	case *rsa.PublicKey:
+		return newRSARecipient(alg, encryptionKey)
+	case *ecdsa.PublicKey:
+		return newECDHRecipient(alg, encryptionKey)
+	case []byte:
+		return newSymmetricRecipient(alg, encryptionKey)
+	case string:
+		return newSymmetricRecipient(alg, []byte(encryptionKey))
+	case *JSONWebKey:
+		recipient, err := makeJWERecipient(alg, encryptionKey.Key)
+		recipient.keyID = encryptionKey.KeyID
+		return recipient, err
+	}
+	if encrypter, ok := encryptionKey.(OpaqueKeyEncrypter); ok {
+		return newOpaqueKeyEncrypter(alg, encrypter)
+	}
+	return recipientKeyInfo{}, ErrUnsupportedKeyType
+}
+
+// newDecrypter creates an appropriate decrypter based on the key type
+func newDecrypter(decryptionKey interface{}) (keyDecrypter, error) {
+	switch decryptionKey := decryptionKey.(type) {
+	case *rsa.PrivateKey:
+		return &rsaDecrypterSigner{
+			privateKey: decryptionKey,
+		}, nil
+	case *ecdsa.PrivateKey:
+		return &ecDecrypterSigner{
+			privateKey: decryptionKey,
+		}, nil
+	case []byte:
+		return &symmetricKeyCipher{
+			key: decryptionKey,
+		}, nil
+	case string:
+		return &symmetricKeyCipher{
+			key: []byte(decryptionKey),
+		}, nil
+	case JSONWebKey:
+		return newDecrypter(decryptionKey.Key)
+	case *JSONWebKey:
+		return newDecrypter(decryptionKey.Key)
+	}
+	if okd, ok := decryptionKey.(OpaqueKeyDecrypter); ok {
+		return &opaqueKeyDecrypter{decrypter: okd}, nil
+	}
+	return nil, ErrUnsupportedKeyType
+}
+
+// Implementation of encrypt method producing a JWE object.
+func (ctx *genericEncrypter) Encrypt(plaintext []byte) (*JSONWebEncryption, error) {
+	return ctx.EncryptWithAuthData(plaintext, nil)
+}
+
+// Implementation of encrypt method producing a JWE object.
+func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWebEncryption, error) {
+	obj := &JSONWebEncryption{}
+	obj.aad = aad
+
+	obj.protected = &rawHeader{}
+	err := obj.protected.set(headerEncryption, ctx.contentAlg)
+	if err != nil {
+		return nil, err
+	}
+
+	obj.recipients = make([]recipientInfo, len(ctx.recipients))
+
+	if len(ctx.recipients) == 0 {
+		return nil, fmt.Errorf("go-jose/go-jose: no recipients to encrypt to")
+	}
+
+	cek, headers, err := ctx.keyGenerator.genKey()
+	if err != nil {
+		return nil, err
+	}
+
+	obj.protected.merge(&headers)
+
+	for i, info := range ctx.recipients {
+		recipient, err := info.keyEncrypter.encryptKey(cek, info.keyAlg)
+		if err != nil {
+			return nil, err
+		}
+
+		err = recipient.header.set(headerAlgorithm, info.keyAlg)
+		if err != nil {
+			return nil, err
+		}
+
+		if info.keyID != "" {
+			err = recipient.header.set(headerKeyID, info.keyID)
+			if err != nil {
+				return nil, err
+			}
+		}
+		obj.recipients[i] = recipient
+	}
+
+	if len(ctx.recipients) == 1 {
+		// Move per-recipient headers into main protected header if there's
+		// only a single recipient.
+		obj.protected.merge(obj.recipients[0].header)
+		obj.recipients[0].header = nil
+	}
+
+	if ctx.compressionAlg != NONE {
+		plaintext, err = compress(ctx.compressionAlg, plaintext)
+		if err != nil {
+			return nil, err
+		}
+
+		err = obj.protected.set(headerCompression, ctx.compressionAlg)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for k, v := range ctx.extraHeaders {
+		b, err := json.Marshal(v)
+		if err != nil {
+			return nil, err
+		}
+		(*obj.protected)[k] = makeRawMessage(b)
+	}
+
+	authData := obj.computeAuthData()
+	parts, err := ctx.cipher.encrypt(cek, authData, plaintext)
+	if err != nil {
+		return nil, err
+	}
+
+	obj.iv = parts.iv
+	obj.ciphertext = parts.ciphertext
+	obj.tag = parts.tag
+
+	return obj, nil
+}
+
+func (ctx *genericEncrypter) Options() EncrypterOptions {
+	return EncrypterOptions{
+		Compression:  ctx.compressionAlg,
+		ExtraHeaders: ctx.extraHeaders,
+	}
+}
+
+// Decrypt and validate the object and return the plaintext. Note that this
+// function does not support multi-recipient, if you desire multi-recipient
+// decryption use DecryptMulti instead.
+func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error) {
+	headers := obj.mergedHeaders(nil)
+
+	if len(obj.recipients) > 1 {
+		return nil, errors.New("go-jose/go-jose: too many recipients in payload; expecting only one")
+	}
+
+	critical, err := headers.getCritical()
+	if err != nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
+		return nil, fmt.Errorf("go-jose/go-jose: unsupported crit header")
+	}
+
+	key := tryJWKS(decryptionKey, obj.Header)
+	decrypter, err := newDecrypter(key)
+	if err != nil {
+		return nil, err
+	}
+
+	cipher := getContentCipher(headers.getEncryption())
+	if cipher == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: unsupported enc value '%s'", string(headers.getEncryption()))
+	}
+
+	generator := randomKeyGenerator{
+		size: cipher.keySize(),
+	}
+
+	parts := &aeadParts{
+		iv:         obj.iv,
+		ciphertext: obj.ciphertext,
+		tag:        obj.tag,
+	}
+
+	authData := obj.computeAuthData()
+
+	var plaintext []byte
+	recipient := obj.recipients[0]
+	recipientHeaders := obj.mergedHeaders(&recipient)
+
+	cek, err := decrypter.decryptKey(recipientHeaders, &recipient, generator)
+	if err == nil {
+		// Found a valid CEK -- let's try to decrypt.
+		plaintext, err = cipher.decrypt(cek, authData, parts)
+	}
+
+	if plaintext == nil {
+		return nil, ErrCryptoFailure
+	}
+
+	// The "zip" header parameter may only be present in the protected header.
+	if comp := obj.protected.getCompression(); comp != "" {
+		plaintext, err = decompress(comp, plaintext)
+	}
+
+	return plaintext, err
+}
+
+// DecryptMulti decrypts and validates the object and returns the plaintexts,
+// with support for multiple recipients. It returns the index of the recipient
+// for which the decryption was successful, the merged headers for that recipient,
+// and the plaintext.
+func (obj JSONWebEncryption) DecryptMulti(decryptionKey interface{}) (int, Header, []byte, error) {
+	globalHeaders := obj.mergedHeaders(nil)
+
+	critical, err := globalHeaders.getCritical()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("go-jose/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
+		return -1, Header{}, nil, fmt.Errorf("go-jose/go-jose: unsupported crit header")
+	}
+
+	key := tryJWKS(decryptionKey, obj.Header)
+	decrypter, err := newDecrypter(key)
+	if err != nil {
+		return -1, Header{}, nil, err
+	}
+
+	encryption := globalHeaders.getEncryption()
+	cipher := getContentCipher(encryption)
+	if cipher == nil {
+		return -1, Header{}, nil, fmt.Errorf("go-jose/go-jose: unsupported enc value '%s'", string(encryption))
+	}
+
+	generator := randomKeyGenerator{
+		size: cipher.keySize(),
+	}
+
+	parts := &aeadParts{
+		iv:         obj.iv,
+		ciphertext: obj.ciphertext,
+		tag:        obj.tag,
+	}
+
+	authData := obj.computeAuthData()
+
+	index := -1
+	var plaintext []byte
+	var headers rawHeader
+
+	for i, recipient := range obj.recipients {
+		recipientHeaders := obj.mergedHeaders(&recipient)
+
+		cek, err := decrypter.decryptKey(recipientHeaders, &recipient, generator)
+		if err == nil {
+			// Found a valid CEK -- let's try to decrypt.
+			plaintext, err = cipher.decrypt(cek, authData, parts)
+			if err == nil {
+				index = i
+				headers = recipientHeaders
+				break
+			}
+		}
+	}
+
+	if plaintext == nil {
+		return -1, Header{}, nil, ErrCryptoFailure
+	}
+
+	// The "zip" header parameter may only be present in the protected header.
+	if comp := obj.protected.getCompression(); comp != "" {
+		plaintext, _ = decompress(comp, plaintext)
+	}
+
+	sanitized, err := headers.sanitized()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("go-jose/go-jose: failed to sanitize header: %v", err)
+	}
+
+	return index, sanitized, plaintext, err
+}

vendor/github.com/go-jose/go-jose/v3/doc.go

@@ -0,0 +1,27 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+
+Package jose aims to provide an implementation of the Javascript Object Signing
+and Encryption set of standards. It implements encryption and signing based on
+the JSON Web Encryption and JSON Web Signature standards, with optional JSON Web
+Token support available in a sub-package. The library supports both the compact
+and JWS/JWE JSON Serialization formats, and has optional support for multiple
+recipients.
+
+*/
+package jose

vendor/github.com/go-jose/go-jose/v3/encoding.go

@@ -0,0 +1,191 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"compress/flate"
+	"encoding/base64"
+	"encoding/binary"
+	"io"
+	"math/big"
+	"strings"
+	"unicode"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// Helper function to serialize known-good objects.
+// Precondition: value is not a nil pointer.
+func mustSerializeJSON(value interface{}) []byte {
+	out, err := json.Marshal(value)
+	if err != nil {
+		panic(err)
+	}
+	// We never want to serialize the top-level value "null," since it's not a
+	// valid JOSE message. But if a caller passes in a nil pointer to this method,
+	// MarshalJSON will happily serialize it as the top-level value "null". If
+	// that value is then embedded in another operation, for instance by being
+	// base64-encoded and fed as input to a signing algorithm
+	// (https://github.com/go-jose/go-jose/issues/22), the result will be
+	// incorrect. Because this method is intended for known-good objects, and a nil
+	// pointer is not a known-good object, we are free to panic in this case.
+	// Note: It's not possible to directly check whether the data pointed at by an
+	// interface is a nil pointer, so we do this hacky workaround.
+	// https://groups.google.com/forum/#!topic/golang-nuts/wnH302gBa4I
+	if string(out) == "null" {
+		panic("Tried to serialize a nil pointer.")
+	}
+	return out
+}
+
+// Strip all newlines and whitespace
+func stripWhitespace(data string) string {
+	buf := strings.Builder{}
+	buf.Grow(len(data))
+	for _, r := range data {
+		if !unicode.IsSpace(r) {
+			buf.WriteRune(r)
+		}
+	}
+	return buf.String()
+}
+
+// Perform compression based on algorithm
+func compress(algorithm CompressionAlgorithm, input []byte) ([]byte, error) {
+	switch algorithm {
+	case DEFLATE:
+		return deflate(input)
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+}
+
+// Perform decompression based on algorithm
+func decompress(algorithm CompressionAlgorithm, input []byte) ([]byte, error) {
+	switch algorithm {
+	case DEFLATE:
+		return inflate(input)
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+}
+
+// Compress with DEFLATE
+func deflate(input []byte) ([]byte, error) {
+	output := new(bytes.Buffer)
+
+	// Writing to byte buffer, err is always nil
+	writer, _ := flate.NewWriter(output, 1)
+	_, _ = io.Copy(writer, bytes.NewBuffer(input))
+
+	err := writer.Close()
+	return output.Bytes(), err
+}
+
+// Decompress with DEFLATE
+func inflate(input []byte) ([]byte, error) {
+	output := new(bytes.Buffer)
+	reader := flate.NewReader(bytes.NewBuffer(input))
+
+	_, err := io.Copy(output, reader)
+	if err != nil {
+		return nil, err
+	}
+
+	err = reader.Close()
+	return output.Bytes(), err
+}
+
+// byteBuffer represents a slice of bytes that can be serialized to url-safe base64.
+type byteBuffer struct {
+	data []byte
+}
+
+func newBuffer(data []byte) *byteBuffer {
+	if data == nil {
+		return nil
+	}
+	return &byteBuffer{
+		data: data,
+	}
+}
+
+func newFixedSizeBuffer(data []byte, length int) *byteBuffer {
+	if len(data) > length {
+		panic("go-jose/go-jose: invalid call to newFixedSizeBuffer (len(data) > length)")
+	}
+	pad := make([]byte, length-len(data))
+	return newBuffer(append(pad, data...))
+}
+
+func newBufferFromInt(num uint64) *byteBuffer {
+	data := make([]byte, 8)
+	binary.BigEndian.PutUint64(data, num)
+	return newBuffer(bytes.TrimLeft(data, "\x00"))
+}
+
+func (b *byteBuffer) MarshalJSON() ([]byte, error) {
+	return json.Marshal(b.base64())
+}
+
+func (b *byteBuffer) UnmarshalJSON(data []byte) error {
+	var encoded string
+	err := json.Unmarshal(data, &encoded)
+	if err != nil {
+		return err
+	}
+
+	if encoded == "" {
+		return nil
+	}
+
+	decoded, err := base64URLDecode(encoded)
+	if err != nil {
+		return err
+	}
+
+	*b = *newBuffer(decoded)
+
+	return nil
+}
+
+func (b *byteBuffer) base64() string {
+	return base64.RawURLEncoding.EncodeToString(b.data)
+}
+
+func (b *byteBuffer) bytes() []byte {
+	// Handling nil here allows us to transparently handle nil slices when serializing.
+	if b == nil {
+		return nil
+	}
+	return b.data
+}
+
+func (b byteBuffer) bigInt() *big.Int {
+	return new(big.Int).SetBytes(b.data)
+}
+
+func (b byteBuffer) toInt() int {
+	return int(b.bigInt().Int64())
+}
+
+// base64URLDecode is implemented as defined in https://www.rfc-editor.org/rfc/rfc7515.html#appendix-C
+func base64URLDecode(value string) ([]byte, error) {
+	value = strings.TrimRight(value, "=")
+	return base64.RawURLEncoding.DecodeString(value)
+}

vendor/github.com/go-jose/go-jose/v3/json/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/go-jose/go-jose/v3/json/README.md

@@ -0,0 +1,13 @@
+# Safe JSON
+
+This repository contains a fork of the `encoding/json` package from Go 1.6.
+
+The following changes were made:
+
+* Object deserialization uses case-sensitive member name matching instead of
+  [case-insensitive matching](https://www.ietf.org/mail-archive/web/json/current/msg03763.html).
+  This is to avoid differences in the interpretation of JOSE messages between
+  go-jose and libraries written in other languages.
+* When deserializing a JSON object, we check for duplicate keys and reject the
+  input whenever we detect a duplicate. Rather than trying to work with malformed
+  data, we prefer to reject it right away.

vendor/github.com/go-jose/go-jose/v3/json/indent.go

@@ -0,0 +1,141 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import "bytes"
+
+// Compact appends to dst the JSON-encoded src with
+// insignificant space characters elided.
+func Compact(dst *bytes.Buffer, src []byte) error {
+	return compact(dst, src, false)
+}
+
+func compact(dst *bytes.Buffer, src []byte, escape bool) error {
+	origLen := dst.Len()
+	var scan scanner
+	scan.reset()
+	start := 0
+	for i, c := range src {
+		if escape && (c == '<' || c == '>' || c == '&') {
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			dst.WriteString(`\u00`)
+			dst.WriteByte(hex[c>>4])
+			dst.WriteByte(hex[c&0xF])
+			start = i + 1
+		}
+		// Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9).
+		if c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 {
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			dst.WriteString(`\u202`)
+			dst.WriteByte(hex[src[i+2]&0xF])
+			start = i + 3
+		}
+		v := scan.step(&scan, c)
+		if v >= scanSkipSpace {
+			if v == scanError {
+				break
+			}
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			start = i + 1
+		}
+	}
+	if scan.eof() == scanError {
+		dst.Truncate(origLen)
+		return scan.err
+	}
+	if start < len(src) {
+		dst.Write(src[start:])
+	}
+	return nil
+}
+
+func newline(dst *bytes.Buffer, prefix, indent string, depth int) {
+	dst.WriteByte('\n')
+	dst.WriteString(prefix)
+	for i := 0; i < depth; i++ {
+		dst.WriteString(indent)
+	}
+}
+
+// Indent appends to dst an indented form of the JSON-encoded src.
+// Each element in a JSON object or array begins on a new,
+// indented line beginning with prefix followed by one or more
+// copies of indent according to the indentation nesting.
+// The data appended to dst does not begin with the prefix nor
+// any indentation, to make it easier to embed inside other formatted JSON data.
+// Although leading space characters (space, tab, carriage return, newline)
+// at the beginning of src are dropped, trailing space characters
+// at the end of src are preserved and copied to dst.
+// For example, if src has no trailing spaces, neither will dst;
+// if src ends in a trailing newline, so will dst.
+func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
+	origLen := dst.Len()
+	var scan scanner
+	scan.reset()
+	needIndent := false
+	depth := 0
+	for _, c := range src {
+		scan.bytes++
+		v := scan.step(&scan, c)
+		if v == scanSkipSpace {
+			continue
+		}
+		if v == scanError {
+			break
+		}
+		if needIndent && v != scanEndObject && v != scanEndArray {
+			needIndent = false
+			depth++
+			newline(dst, prefix, indent, depth)
+		}
+
+		// Emit semantically uninteresting bytes
+		// (in particular, punctuation in strings) unmodified.
+		if v == scanContinue {
+			dst.WriteByte(c)
+			continue
+		}
+
+		// Add spacing around real punctuation.
+		switch c {
+		case '{', '[':
+			// delay indent so that empty object and array are formatted as {} and [].
+			needIndent = true
+			dst.WriteByte(c)
+
+		case ',':
+			dst.WriteByte(c)
+			newline(dst, prefix, indent, depth)
+
+		case ':':
+			dst.WriteByte(c)
+			dst.WriteByte(' ')
+
+		case '}', ']':
+			if needIndent {
+				// suppress indent in empty object/array
+				needIndent = false
+			} else {
+				depth--
+				newline(dst, prefix, indent, depth)
+			}
+			dst.WriteByte(c)
+
+		default:
+			dst.WriteByte(c)
+		}
+	}
+	if scan.eof() == scanError {
+		dst.Truncate(origLen)
+		return scan.err
+	}
+	return nil
+}

vendor/github.com/go-jose/go-jose/v3/json/scanner.go

@@ -0,0 +1,623 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+// JSON value parser state machine.
+// Just about at the limit of what is reasonable to write by hand.
+// Some parts are a bit tedious, but overall it nicely factors out the
+// otherwise common code from the multiple scanning functions
+// in this package (Compact, Indent, checkValid, nextValue, etc).
+//
+// This file starts with two simple examples using the scanner
+// before diving into the scanner itself.
+
+import "strconv"
+
+// checkValid verifies that data is valid JSON-encoded data.
+// scan is passed in for use by checkValid to avoid an allocation.
+func checkValid(data []byte, scan *scanner) error {
+	scan.reset()
+	for _, c := range data {
+		scan.bytes++
+		if scan.step(scan, c) == scanError {
+			return scan.err
+		}
+	}
+	if scan.eof() == scanError {
+		return scan.err
+	}
+	return nil
+}
+
+// nextValue splits data after the next whole JSON value,
+// returning that value and the bytes that follow it as separate slices.
+// scan is passed in for use by nextValue to avoid an allocation.
+func nextValue(data []byte, scan *scanner) (value, rest []byte, err error) {
+	scan.reset()
+	for i, c := range data {
+		v := scan.step(scan, c)
+		if v >= scanEndObject {
+			switch v {
+			// probe the scanner with a space to determine whether we will
+			// get scanEnd on the next character. Otherwise, if the next character
+			// is not a space, scanEndTop allocates a needless error.
+			case scanEndObject, scanEndArray:
+				if scan.step(scan, ' ') == scanEnd {
+					return data[:i+1], data[i+1:], nil
+				}
+			case scanError:
+				return nil, nil, scan.err
+			case scanEnd:
+				return data[:i], data[i:], nil
+			}
+		}
+	}
+	if scan.eof() == scanError {
+		return nil, nil, scan.err
+	}
+	return data, nil, nil
+}
+
+// A SyntaxError is a description of a JSON syntax error.
+type SyntaxError struct {
+	msg    string // description of error
+	Offset int64  // error occurred after reading Offset bytes
+}
+
+func (e *SyntaxError) Error() string { return e.msg }
+
+// A scanner is a JSON scanning state machine.
+// Callers call scan.reset() and then pass bytes in one at a time
+// by calling scan.step(&scan, c) for each byte.
+// The return value, referred to as an opcode, tells the
+// caller about significant parsing events like beginning
+// and ending literals, objects, and arrays, so that the
+// caller can follow along if it wishes.
+// The return value scanEnd indicates that a single top-level
+// JSON value has been completed, *before* the byte that
+// just got passed in.  (The indication must be delayed in order
+// to recognize the end of numbers: is 123 a whole value or
+// the beginning of 12345e+6?).
+type scanner struct {
+	// The step is a func to be called to execute the next transition.
+	// Also tried using an integer constant and a single func
+	// with a switch, but using the func directly was 10% faster
+	// on a 64-bit Mac Mini, and it's nicer to read.
+	step func(*scanner, byte) int
+
+	// Reached end of top-level value.
+	endTop bool
+
+	// Stack of what we're in the middle of - array values, object keys, object values.
+	parseState []int
+
+	// Error that happened, if any.
+	err error
+
+	// 1-byte redo (see undo method)
+	redo      bool
+	redoCode  int
+	redoState func(*scanner, byte) int
+
+	// total bytes consumed, updated by decoder.Decode
+	bytes int64
+}
+
+// These values are returned by the state transition functions
+// assigned to scanner.state and the method scanner.eof.
+// They give details about the current state of the scan that
+// callers might be interested to know about.
+// It is okay to ignore the return value of any particular
+// call to scanner.state: if one call returns scanError,
+// every subsequent call will return scanError too.
+const (
+	// Continue.
+	scanContinue     = iota // uninteresting byte
+	scanBeginLiteral        // end implied by next result != scanContinue
+	scanBeginObject         // begin object
+	scanObjectKey           // just finished object key (string)
+	scanObjectValue         // just finished non-last object value
+	scanEndObject           // end object (implies scanObjectValue if possible)
+	scanBeginArray          // begin array
+	scanArrayValue          // just finished array value
+	scanEndArray            // end array (implies scanArrayValue if possible)
+	scanSkipSpace           // space byte; can skip; known to be last "continue" result
+
+	// Stop.
+	scanEnd   // top-level value ended *before* this byte; known to be first "stop" result
+	scanError // hit an error, scanner.err.
+)
+
+// These values are stored in the parseState stack.
+// They give the current state of a composite value
+// being scanned.  If the parser is inside a nested value
+// the parseState describes the nested state, outermost at entry 0.
+const (
+	parseObjectKey   = iota // parsing object key (before colon)
+	parseObjectValue        // parsing object value (after colon)
+	parseArrayValue         // parsing array value
+)
+
+// reset prepares the scanner for use.
+// It must be called before calling s.step.
+func (s *scanner) reset() {
+	s.step = stateBeginValue
+	s.parseState = s.parseState[0:0]
+	s.err = nil
+	s.redo = false
+	s.endTop = false
+}
+
+// eof tells the scanner that the end of input has been reached.
+// It returns a scan status just as s.step does.
+func (s *scanner) eof() int {
+	if s.err != nil {
+		return scanError
+	}
+	if s.endTop {
+		return scanEnd
+	}
+	s.step(s, ' ')
+	if s.endTop {
+		return scanEnd
+	}
+	if s.err == nil {
+		s.err = &SyntaxError{"unexpected end of JSON input", s.bytes}
+	}
+	return scanError
+}
+
+// pushParseState pushes a new parse state p onto the parse stack.
+func (s *scanner) pushParseState(p int) {
+	s.parseState = append(s.parseState, p)
+}
+
+// popParseState pops a parse state (already obtained) off the stack
+// and updates s.step accordingly.
+func (s *scanner) popParseState() {
+	n := len(s.parseState) - 1
+	s.parseState = s.parseState[0:n]
+	s.redo = false
+	if n == 0 {
+		s.step = stateEndTop
+		s.endTop = true
+	} else {
+		s.step = stateEndValue
+	}
+}
+
+func isSpace(c byte) bool {
+	return c == ' ' || c == '\t' || c == '\r' || c == '\n'
+}
+
+// stateBeginValueOrEmpty is the state after reading `[`.
+func stateBeginValueOrEmpty(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == ']' {
+		return stateEndValue(s, c)
+	}
+	return stateBeginValue(s, c)
+}
+
+// stateBeginValue is the state at the beginning of the input.
+func stateBeginValue(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	switch c {
+	case '{':
+		s.step = stateBeginStringOrEmpty
+		s.pushParseState(parseObjectKey)
+		return scanBeginObject
+	case '[':
+		s.step = stateBeginValueOrEmpty
+		s.pushParseState(parseArrayValue)
+		return scanBeginArray
+	case '"':
+		s.step = stateInString
+		return scanBeginLiteral
+	case '-':
+		s.step = stateNeg
+		return scanBeginLiteral
+	case '0': // beginning of 0.123
+		s.step = state0
+		return scanBeginLiteral
+	case 't': // beginning of true
+		s.step = stateT
+		return scanBeginLiteral
+	case 'f': // beginning of false
+		s.step = stateF
+		return scanBeginLiteral
+	case 'n': // beginning of null
+		s.step = stateN
+		return scanBeginLiteral
+	}
+	if '1' <= c && c <= '9' { // beginning of 1234.5
+		s.step = state1
+		return scanBeginLiteral
+	}
+	return s.error(c, "looking for beginning of value")
+}
+
+// stateBeginStringOrEmpty is the state after reading `{`.
+func stateBeginStringOrEmpty(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == '}' {
+		n := len(s.parseState)
+		s.parseState[n-1] = parseObjectValue
+		return stateEndValue(s, c)
+	}
+	return stateBeginString(s, c)
+}
+
+// stateBeginString is the state after reading `{"key": value,`.
+func stateBeginString(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == '"' {
+		s.step = stateInString
+		return scanBeginLiteral
+	}
+	return s.error(c, "looking for beginning of object key string")
+}
+
+// stateEndValue is the state after completing a value,
+// such as after reading `{}` or `true` or `["x"`.
+func stateEndValue(s *scanner, c byte) int {
+	n := len(s.parseState)
+	if n == 0 {
+		// Completed top-level before the current byte.
+		s.step = stateEndTop
+		s.endTop = true
+		return stateEndTop(s, c)
+	}
+	if c <= ' ' && isSpace(c) {
+		s.step = stateEndValue
+		return scanSkipSpace
+	}
+	ps := s.parseState[n-1]
+	switch ps {
+	case parseObjectKey:
+		if c == ':' {
+			s.parseState[n-1] = parseObjectValue
+			s.step = stateBeginValue
+			return scanObjectKey
+		}
+		return s.error(c, "after object key")
+	case parseObjectValue:
+		if c == ',' {
+			s.parseState[n-1] = parseObjectKey
+			s.step = stateBeginString
+			return scanObjectValue
+		}
+		if c == '}' {
+			s.popParseState()
+			return scanEndObject
+		}
+		return s.error(c, "after object key:value pair")
+	case parseArrayValue:
+		if c == ',' {
+			s.step = stateBeginValue
+			return scanArrayValue
+		}
+		if c == ']' {
+			s.popParseState()
+			return scanEndArray
+		}
+		return s.error(c, "after array element")
+	}
+	return s.error(c, "")
+}
+
+// stateEndTop is the state after finishing the top-level value,
+// such as after reading `{}` or `[1,2,3]`.
+// Only space characters should be seen now.
+func stateEndTop(s *scanner, c byte) int {
+	if c != ' ' && c != '\t' && c != '\r' && c != '\n' {
+		// Complain about non-space byte on next call.
+		s.error(c, "after top-level value")
+	}
+	return scanEnd
+}
+
+// stateInString is the state after reading `"`.
+func stateInString(s *scanner, c byte) int {
+	if c == '"' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	if c == '\\' {
+		s.step = stateInStringEsc
+		return scanContinue
+	}
+	if c < 0x20 {
+		return s.error(c, "in string literal")
+	}
+	return scanContinue
+}
+
+// stateInStringEsc is the state after reading `"\` during a quoted string.
+func stateInStringEsc(s *scanner, c byte) int {
+	switch c {
+	case 'b', 'f', 'n', 'r', 't', '\\', '/', '"':
+		s.step = stateInString
+		return scanContinue
+	case 'u':
+		s.step = stateInStringEscU
+		return scanContinue
+	}
+	return s.error(c, "in string escape code")
+}
+
+// stateInStringEscU is the state after reading `"\u` during a quoted string.
+func stateInStringEscU(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU1
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU1 is the state after reading `"\u1` during a quoted string.
+func stateInStringEscU1(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU12
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU12 is the state after reading `"\u12` during a quoted string.
+func stateInStringEscU12(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU123
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU123 is the state after reading `"\u123` during a quoted string.
+func stateInStringEscU123(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInString
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateNeg is the state after reading `-` during a number.
+func stateNeg(s *scanner, c byte) int {
+	if c == '0' {
+		s.step = state0
+		return scanContinue
+	}
+	if '1' <= c && c <= '9' {
+		s.step = state1
+		return scanContinue
+	}
+	return s.error(c, "in numeric literal")
+}
+
+// state1 is the state after reading a non-zero integer during a number,
+// such as after reading `1` or `100` but not `0`.
+func state1(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = state1
+		return scanContinue
+	}
+	return state0(s, c)
+}
+
+// state0 is the state after reading `0` during a number.
+func state0(s *scanner, c byte) int {
+	if c == '.' {
+		s.step = stateDot
+		return scanContinue
+	}
+	if c == 'e' || c == 'E' {
+		s.step = stateE
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateDot is the state after reading the integer and decimal point in a number,
+// such as after reading `1.`.
+func stateDot(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = stateDot0
+		return scanContinue
+	}
+	return s.error(c, "after decimal point in numeric literal")
+}
+
+// stateDot0 is the state after reading the integer, decimal point, and subsequent
+// digits of a number, such as after reading `3.14`.
+func stateDot0(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		return scanContinue
+	}
+	if c == 'e' || c == 'E' {
+		s.step = stateE
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateE is the state after reading the mantissa and e in a number,
+// such as after reading `314e` or `0.314e`.
+func stateE(s *scanner, c byte) int {
+	if c == '+' || c == '-' {
+		s.step = stateESign
+		return scanContinue
+	}
+	return stateESign(s, c)
+}
+
+// stateESign is the state after reading the mantissa, e, and sign in a number,
+// such as after reading `314e-` or `0.314e+`.
+func stateESign(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = stateE0
+		return scanContinue
+	}
+	return s.error(c, "in exponent of numeric literal")
+}
+
+// stateE0 is the state after reading the mantissa, e, optional sign,
+// and at least one digit of the exponent in a number,
+// such as after reading `314e-2` or `0.314e+1` or `3.14e0`.
+func stateE0(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateT is the state after reading `t`.
+func stateT(s *scanner, c byte) int {
+	if c == 'r' {
+		s.step = stateTr
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'r')")
+}
+
+// stateTr is the state after reading `tr`.
+func stateTr(s *scanner, c byte) int {
+	if c == 'u' {
+		s.step = stateTru
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'u')")
+}
+
+// stateTru is the state after reading `tru`.
+func stateTru(s *scanner, c byte) int {
+	if c == 'e' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'e')")
+}
+
+// stateF is the state after reading `f`.
+func stateF(s *scanner, c byte) int {
+	if c == 'a' {
+		s.step = stateFa
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'a')")
+}
+
+// stateFa is the state after reading `fa`.
+func stateFa(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateFal
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'l')")
+}
+
+// stateFal is the state after reading `fal`.
+func stateFal(s *scanner, c byte) int {
+	if c == 's' {
+		s.step = stateFals
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 's')")
+}
+
+// stateFals is the state after reading `fals`.
+func stateFals(s *scanner, c byte) int {
+	if c == 'e' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'e')")
+}
+
+// stateN is the state after reading `n`.
+func stateN(s *scanner, c byte) int {
+	if c == 'u' {
+		s.step = stateNu
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'u')")
+}
+
+// stateNu is the state after reading `nu`.
+func stateNu(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateNul
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'l')")
+}
+
+// stateNul is the state after reading `nul`.
+func stateNul(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'l')")
+}
+
+// stateError is the state after reaching a syntax error,
+// such as after reading `[1}` or `5.1.2`.
+func stateError(s *scanner, c byte) int {
+	return scanError
+}
+
+// error records an error and switches to the error state.
+func (s *scanner) error(c byte, context string) int {
+	s.step = stateError
+	s.err = &SyntaxError{"invalid character " + quoteChar(c) + " " + context, s.bytes}
+	return scanError
+}
+
+// quoteChar formats c as a quoted character literal
+func quoteChar(c byte) string {
+	// special cases - different from quoted strings
+	if c == '\'' {
+		return `'\''`
+	}
+	if c == '"' {
+		return `'"'`
+	}
+
+	// use quoted string with different quotation marks
+	s := strconv.Quote(string(c))
+	return "'" + s[1:len(s)-1] + "'"
+}
+
+// undo causes the scanner to return scanCode from the next state transition.
+// This gives callers a simple 1-byte undo mechanism.
+func (s *scanner) undo(scanCode int) {
+	if s.redo {
+		panic("json: invalid use of scanner")
+	}
+	s.redoCode = scanCode
+	s.redoState = s.step
+	s.step = stateRedo
+	s.redo = true
+}
+
+// stateRedo helps implement the scanner's 1-byte undo.
+func stateRedo(s *scanner, c byte) int {
+	s.redo = false
+	s.step = s.redoState
+	return s.redoCode
+}

vendor/github.com/go-jose/go-jose/v3/json/stream.go

@@ -0,0 +1,485 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"errors"
+	"io"
+)
+
+// A Decoder reads and decodes JSON objects from an input stream.
+type Decoder struct {
+	r     io.Reader
+	buf   []byte
+	d     decodeState
+	scanp int // start of unread data in buf
+	scan  scanner
+	err   error
+
+	tokenState int
+	tokenStack []int
+}
+
+// NewDecoder returns a new decoder that reads from r.
+//
+// The decoder introduces its own buffering and may
+// read data from r beyond the JSON values requested.
+func NewDecoder(r io.Reader) *Decoder {
+	return &Decoder{r: r}
+}
+
+// Deprecated: Use `SetNumberType` instead
+// UseNumber causes the Decoder to unmarshal a number into an interface{} as a
+// Number instead of as a float64.
+func (dec *Decoder) UseNumber() { dec.d.numberType = UnmarshalJSONNumber }
+
+// SetNumberType causes the Decoder to unmarshal a number into an interface{} as a
+// Number, float64 or int64 depending on `t` enum value.
+func (dec *Decoder) SetNumberType(t NumberUnmarshalType) { dec.d.numberType = t }
+
+// Decode reads the next JSON-encoded value from its
+// input and stores it in the value pointed to by v.
+//
+// See the documentation for Unmarshal for details about
+// the conversion of JSON into a Go value.
+func (dec *Decoder) Decode(v interface{}) error {
+	if dec.err != nil {
+		return dec.err
+	}
+
+	if err := dec.tokenPrepareForDecode(); err != nil {
+		return err
+	}
+
+	if !dec.tokenValueAllowed() {
+		return &SyntaxError{msg: "not at beginning of value"}
+	}
+
+	// Read whole value into buffer.
+	n, err := dec.readValue()
+	if err != nil {
+		return err
+	}
+	dec.d.init(dec.buf[dec.scanp : dec.scanp+n])
+	dec.scanp += n
+
+	// Don't save err from unmarshal into dec.err:
+	// the connection is still usable since we read a complete JSON
+	// object from it before the error happened.
+	err = dec.d.unmarshal(v)
+
+	// fixup token streaming state
+	dec.tokenValueEnd()
+
+	return err
+}
+
+// Buffered returns a reader of the data remaining in the Decoder's
+// buffer. The reader is valid until the next call to Decode.
+func (dec *Decoder) Buffered() io.Reader {
+	return bytes.NewReader(dec.buf[dec.scanp:])
+}
+
+// readValue reads a JSON value into dec.buf.
+// It returns the length of the encoding.
+func (dec *Decoder) readValue() (int, error) {
+	dec.scan.reset()
+
+	scanp := dec.scanp
+	var err error
+Input:
+	for {
+		// Look in the buffer for a new value.
+		for i, c := range dec.buf[scanp:] {
+			dec.scan.bytes++
+			v := dec.scan.step(&dec.scan, c)
+			if v == scanEnd {
+				scanp += i
+				break Input
+			}
+			// scanEnd is delayed one byte.
+			// We might block trying to get that byte from src,
+			// so instead invent a space byte.
+			if (v == scanEndObject || v == scanEndArray) && dec.scan.step(&dec.scan, ' ') == scanEnd {
+				scanp += i + 1
+				break Input
+			}
+			if v == scanError {
+				dec.err = dec.scan.err
+				return 0, dec.scan.err
+			}
+		}
+		scanp = len(dec.buf)
+
+		// Did the last read have an error?
+		// Delayed until now to allow buffer scan.
+		if err != nil {
+			if err == io.EOF {
+				if dec.scan.step(&dec.scan, ' ') == scanEnd {
+					break Input
+				}
+				if nonSpace(dec.buf) {
+					err = io.ErrUnexpectedEOF
+				}
+			}
+			dec.err = err
+			return 0, err
+		}
+
+		n := scanp - dec.scanp
+		err = dec.refill()
+		scanp = dec.scanp + n
+	}
+	return scanp - dec.scanp, nil
+}
+
+func (dec *Decoder) refill() error {
+	// Make room to read more into the buffer.
+	// First slide down data already consumed.
+	if dec.scanp > 0 {
+		n := copy(dec.buf, dec.buf[dec.scanp:])
+		dec.buf = dec.buf[:n]
+		dec.scanp = 0
+	}
+
+	// Grow buffer if not large enough.
+	const minRead = 512
+	if cap(dec.buf)-len(dec.buf) < minRead {
+		newBuf := make([]byte, len(dec.buf), 2*cap(dec.buf)+minRead)
+		copy(newBuf, dec.buf)
+		dec.buf = newBuf
+	}
+
+	// Read.  Delay error for next iteration (after scan).
+	n, err := dec.r.Read(dec.buf[len(dec.buf):cap(dec.buf)])
+	dec.buf = dec.buf[0 : len(dec.buf)+n]
+
+	return err
+}
+
+func nonSpace(b []byte) bool {
+	for _, c := range b {
+		if !isSpace(c) {
+			return true
+		}
+	}
+	return false
+}
+
+// An Encoder writes JSON objects to an output stream.
+type Encoder struct {
+	w   io.Writer
+	err error
+}
+
+// NewEncoder returns a new encoder that writes to w.
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{w: w}
+}
+
+// Encode writes the JSON encoding of v to the stream,
+// followed by a newline character.
+//
+// See the documentation for Marshal for details about the
+// conversion of Go values to JSON.
+func (enc *Encoder) Encode(v interface{}) error {
+	if enc.err != nil {
+		return enc.err
+	}
+	e := newEncodeState()
+	err := e.marshal(v)
+	if err != nil {
+		return err
+	}
+
+	// Terminate each value with a newline.
+	// This makes the output look a little nicer
+	// when debugging, and some kind of space
+	// is required if the encoded value was a number,
+	// so that the reader knows there aren't more
+	// digits coming.
+	e.WriteByte('\n')
+
+	if _, err = enc.w.Write(e.Bytes()); err != nil {
+		enc.err = err
+	}
+	encodeStatePool.Put(e)
+	return err
+}
+
+// RawMessage is a raw encoded JSON object.
+// It implements Marshaler and Unmarshaler and can
+// be used to delay JSON decoding or precompute a JSON encoding.
+type RawMessage []byte
+
+// MarshalJSON returns *m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("json.RawMessage: UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}
+
+var _ Marshaler = (*RawMessage)(nil)
+var _ Unmarshaler = (*RawMessage)(nil)
+
+// A Token holds a value of one of these types:
+//
+//	Delim, for the four JSON delimiters [ ] { }
+//	bool, for JSON booleans
+//	float64, for JSON numbers
+//	Number, for JSON numbers
+//	string, for JSON string literals
+//	nil, for JSON null
+//
+type Token interface{}
+
+const (
+	tokenTopValue = iota
+	tokenArrayStart
+	tokenArrayValue
+	tokenArrayComma
+	tokenObjectStart
+	tokenObjectKey
+	tokenObjectColon
+	tokenObjectValue
+	tokenObjectComma
+)
+
+// advance tokenstate from a separator state to a value state
+func (dec *Decoder) tokenPrepareForDecode() error {
+	// Note: Not calling peek before switch, to avoid
+	// putting peek into the standard Decode path.
+	// peek is only called when using the Token API.
+	switch dec.tokenState {
+	case tokenArrayComma:
+		c, err := dec.peek()
+		if err != nil {
+			return err
+		}
+		if c != ',' {
+			return &SyntaxError{"expected comma after array element", 0}
+		}
+		dec.scanp++
+		dec.tokenState = tokenArrayValue
+	case tokenObjectColon:
+		c, err := dec.peek()
+		if err != nil {
+			return err
+		}
+		if c != ':' {
+			return &SyntaxError{"expected colon after object key", 0}
+		}
+		dec.scanp++
+		dec.tokenState = tokenObjectValue
+	}
+	return nil
+}
+
+func (dec *Decoder) tokenValueAllowed() bool {
+	switch dec.tokenState {
+	case tokenTopValue, tokenArrayStart, tokenArrayValue, tokenObjectValue:
+		return true
+	}
+	return false
+}
+
+func (dec *Decoder) tokenValueEnd() {
+	switch dec.tokenState {
+	case tokenArrayStart, tokenArrayValue:
+		dec.tokenState = tokenArrayComma
+	case tokenObjectValue:
+		dec.tokenState = tokenObjectComma
+	}
+}
+
+// A Delim is a JSON array or object delimiter, one of [ ] { or }.
+type Delim rune
+
+func (d Delim) String() string {
+	return string(d)
+}
+
+// Token returns the next JSON token in the input stream.
+// At the end of the input stream, Token returns nil, io.EOF.
+//
+// Token guarantees that the delimiters [ ] { } it returns are
+// properly nested and matched: if Token encounters an unexpected
+// delimiter in the input, it will return an error.
+//
+// The input stream consists of basic JSON values—bool, string,
+// number, and null—along with delimiters [ ] { } of type Delim
+// to mark the start and end of arrays and objects.
+// Commas and colons are elided.
+func (dec *Decoder) Token() (Token, error) {
+	for {
+		c, err := dec.peek()
+		if err != nil {
+			return nil, err
+		}
+		switch c {
+		case '[':
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
+			dec.tokenState = tokenArrayStart
+			return Delim('['), nil
+
+		case ']':
+			if dec.tokenState != tokenArrayStart && dec.tokenState != tokenArrayComma {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
+			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
+			dec.tokenValueEnd()
+			return Delim(']'), nil
+
+		case '{':
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
+			dec.tokenState = tokenObjectStart
+			return Delim('{'), nil
+
+		case '}':
+			if dec.tokenState != tokenObjectStart && dec.tokenState != tokenObjectComma {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
+			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
+			dec.tokenValueEnd()
+			return Delim('}'), nil
+
+		case ':':
+			if dec.tokenState != tokenObjectColon {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = tokenObjectValue
+			continue
+
+		case ',':
+			if dec.tokenState == tokenArrayComma {
+				dec.scanp++
+				dec.tokenState = tokenArrayValue
+				continue
+			}
+			if dec.tokenState == tokenObjectComma {
+				dec.scanp++
+				dec.tokenState = tokenObjectKey
+				continue
+			}
+			return dec.tokenError(c)
+
+		case '"':
+			if dec.tokenState == tokenObjectStart || dec.tokenState == tokenObjectKey {
+				var x string
+				old := dec.tokenState
+				dec.tokenState = tokenTopValue
+				err := dec.Decode(&x)
+				dec.tokenState = old
+				if err != nil {
+					clearOffset(err)
+					return nil, err
+				}
+				dec.tokenState = tokenObjectColon
+				return x, nil
+			}
+			fallthrough
+
+		default:
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			var x interface{}
+			if err := dec.Decode(&x); err != nil {
+				clearOffset(err)
+				return nil, err
+			}
+			return x, nil
+		}
+	}
+}
+
+func clearOffset(err error) {
+	if s, ok := err.(*SyntaxError); ok {
+		s.Offset = 0
+	}
+}
+
+func (dec *Decoder) tokenError(c byte) (Token, error) {
+	var context string
+	switch dec.tokenState {
+	case tokenTopValue:
+		context = " looking for beginning of value"
+	case tokenArrayStart, tokenArrayValue, tokenObjectValue:
+		context = " looking for beginning of value"
+	case tokenArrayComma:
+		context = " after array element"
+	case tokenObjectKey:
+		context = " looking for beginning of object key string"
+	case tokenObjectColon:
+		context = " after object key"
+	case tokenObjectComma:
+		context = " after object key:value pair"
+	}
+	return nil, &SyntaxError{"invalid character " + quoteChar(c) + " " + context, 0}
+}
+
+// More reports whether there is another element in the
+// current array or object being parsed.
+func (dec *Decoder) More() bool {
+	c, err := dec.peek()
+	return err == nil && c != ']' && c != '}'
+}
+
+func (dec *Decoder) peek() (byte, error) {
+	var err error
+	for {
+		for i := dec.scanp; i < len(dec.buf); i++ {
+			c := dec.buf[i]
+			if isSpace(c) {
+				continue
+			}
+			dec.scanp = i
+			return c, nil
+		}
+		// buffer has been scanned, now report any error
+		if err != nil {
+			return 0, err
+		}
+		err = dec.refill()
+	}
+}
+
+/*
+TODO
+
+// EncodeToken writes the given JSON token to the stream.
+// It returns an error if the delimiters [ ] { } are not properly used.
+//
+// EncodeToken does not call Flush, because usually it is part of
+// a larger operation such as Encode, and those will call Flush when finished.
+// Callers that create an Encoder and then invoke EncodeToken directly,
+// without using Encode, need to call Flush when finished to ensure that
+// the JSON is written to the underlying writer.
+func (e *Encoder) EncodeToken(t Token) error  {
+	...
+}
+
+*/

vendor/github.com/go-jose/go-jose/v3/json/tags.go

@@ -0,0 +1,44 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"strings"
+)
+
+// tagOptions is the string following a comma in a struct field's "json"
+// tag, or the empty string. It does not include the leading comma.
+type tagOptions string
+
+// parseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func parseTag(tag string) (string, tagOptions) {
+	if idx := strings.Index(tag, ","); idx != -1 {
+		return tag[:idx], tagOptions(tag[idx+1:])
+	}
+	return tag, tagOptions("")
+}
+
+// Contains reports whether a comma-separated list of options
+// contains a particular substr flag. substr must be surrounded by a
+// string boundary or commas.
+func (o tagOptions) Contains(optionName string) bool {
+	if len(o) == 0 {
+		return false
+	}
+	s := string(o)
+	for s != "" {
+		var next string
+		i := strings.Index(s, ",")
+		if i >= 0 {
+			s, next = s[:i], s[i+1:]
+		}
+		if s == optionName {
+			return true
+		}
+		s = next
+	}
+	return false
+}

vendor/github.com/go-jose/go-jose/v3/jwe.go

@@ -0,0 +1,295 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// rawJSONWebEncryption represents a raw JWE JSON object. Used for parsing/serializing.
+type rawJSONWebEncryption struct {
+	Protected    *byteBuffer        `json:"protected,omitempty"`
+	Unprotected  *rawHeader         `json:"unprotected,omitempty"`
+	Header       *rawHeader         `json:"header,omitempty"`
+	Recipients   []rawRecipientInfo `json:"recipients,omitempty"`
+	Aad          *byteBuffer        `json:"aad,omitempty"`
+	EncryptedKey *byteBuffer        `json:"encrypted_key,omitempty"`
+	Iv           *byteBuffer        `json:"iv,omitempty"`
+	Ciphertext   *byteBuffer        `json:"ciphertext,omitempty"`
+	Tag          *byteBuffer        `json:"tag,omitempty"`
+}
+
+// rawRecipientInfo represents a raw JWE Per-Recipient header JSON object. Used for parsing/serializing.
+type rawRecipientInfo struct {
+	Header       *rawHeader `json:"header,omitempty"`
+	EncryptedKey string     `json:"encrypted_key,omitempty"`
+}
+
+// JSONWebEncryption represents an encrypted JWE object after parsing.
+type JSONWebEncryption struct {
+	Header                   Header
+	protected, unprotected   *rawHeader
+	recipients               []recipientInfo
+	aad, iv, ciphertext, tag []byte
+	original                 *rawJSONWebEncryption
+}
+
+// recipientInfo represents a raw JWE Per-Recipient header JSON object after parsing.
+type recipientInfo struct {
+	header       *rawHeader
+	encryptedKey []byte
+}
+
+// GetAuthData retrieves the (optional) authenticated data attached to the object.
+func (obj JSONWebEncryption) GetAuthData() []byte {
+	if obj.aad != nil {
+		out := make([]byte, len(obj.aad))
+		copy(out, obj.aad)
+		return out
+	}
+
+	return nil
+}
+
+// Get the merged header values
+func (obj JSONWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
+	out := rawHeader{}
+	out.merge(obj.protected)
+	out.merge(obj.unprotected)
+
+	if recipient != nil {
+		out.merge(recipient.header)
+	}
+
+	return out
+}
+
+// Get the additional authenticated data from a JWE object.
+func (obj JSONWebEncryption) computeAuthData() []byte {
+	var protected string
+
+	switch {
+	case obj.original != nil && obj.original.Protected != nil:
+		protected = obj.original.Protected.base64()
+	case obj.protected != nil:
+		protected = base64.RawURLEncoding.EncodeToString(mustSerializeJSON((obj.protected)))
+	default:
+		protected = ""
+	}
+
+	output := []byte(protected)
+	if obj.aad != nil {
+		output = append(output, '.')
+		output = append(output, []byte(base64.RawURLEncoding.EncodeToString(obj.aad))...)
+	}
+
+	return output
+}
+
+// ParseEncrypted parses an encrypted message in compact or JWE JSON Serialization format.
+func ParseEncrypted(input string) (*JSONWebEncryption, error) {
+	input = stripWhitespace(input)
+	if strings.HasPrefix(input, "{") {
+		return parseEncryptedFull(input)
+	}
+
+	return parseEncryptedCompact(input)
+}
+
+// parseEncryptedFull parses a message in compact format.
+func parseEncryptedFull(input string) (*JSONWebEncryption, error) {
+	var parsed rawJSONWebEncryption
+	err := json.Unmarshal([]byte(input), &parsed)
+	if err != nil {
+		return nil, err
+	}
+
+	return parsed.sanitized()
+}
+
+// sanitized produces a cleaned-up JWE object from the raw JSON.
+func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
+	obj := &JSONWebEncryption{
+		original:    parsed,
+		unprotected: parsed.Unprotected,
+	}
+
+	// Check that there is not a nonce in the unprotected headers
+	if parsed.Unprotected != nil {
+		if nonce := parsed.Unprotected.getNonce(); nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
+	}
+	if parsed.Header != nil {
+		if nonce := parsed.Header.getNonce(); nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
+	}
+
+	if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
+		err := json.Unmarshal(parsed.Protected.bytes(), &obj.protected)
+		if err != nil {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid protected header: %s, %s", err, parsed.Protected.base64())
+		}
+	}
+
+	// Note: this must be called _after_ we parse the protected header,
+	// otherwise fields from the protected header will not get picked up.
+	var err error
+	mergedHeaders := obj.mergedHeaders(nil)
+	obj.Header, err = mergedHeaders.sanitized()
+	if err != nil {
+		return nil, fmt.Errorf("go-jose/go-jose: cannot sanitize merged headers: %v (%v)", err, mergedHeaders)
+	}
+
+	if len(parsed.Recipients) == 0 {
+		obj.recipients = []recipientInfo{
+			{
+				header:       parsed.Header,
+				encryptedKey: parsed.EncryptedKey.bytes(),
+			},
+		}
+	} else {
+		obj.recipients = make([]recipientInfo, len(parsed.Recipients))
+		for r := range parsed.Recipients {
+			encryptedKey, err := base64URLDecode(parsed.Recipients[r].EncryptedKey)
+			if err != nil {
+				return nil, err
+			}
+
+			// Check that there is not a nonce in the unprotected header
+			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.getNonce() != "" {
+				return nil, ErrUnprotectedNonce
+			}
+
+			obj.recipients[r].header = parsed.Recipients[r].Header
+			obj.recipients[r].encryptedKey = encryptedKey
+		}
+	}
+
+	for _, recipient := range obj.recipients {
+		headers := obj.mergedHeaders(&recipient)
+		if headers.getAlgorithm() == "" || headers.getEncryption() == "" {
+			return nil, fmt.Errorf("go-jose/go-jose: message is missing alg/enc headers")
+		}
+	}
+
+	obj.iv = parsed.Iv.bytes()
+	obj.ciphertext = parsed.Ciphertext.bytes()
+	obj.tag = parsed.Tag.bytes()
+	obj.aad = parsed.Aad.bytes()
+
+	return obj, nil
+}
+
+// parseEncryptedCompact parses a message in compact format.
+func parseEncryptedCompact(input string) (*JSONWebEncryption, error) {
+	parts := strings.Split(input, ".")
+	if len(parts) != 5 {
+		return nil, fmt.Errorf("go-jose/go-jose: compact JWE format must have five parts")
+	}
+
+	rawProtected, err := base64URLDecode(parts[0])
+	if err != nil {
+		return nil, err
+	}
+
+	encryptedKey, err := base64URLDecode(parts[1])
+	if err != nil {
+		return nil, err
+	}
+
+	iv, err := base64URLDecode(parts[2])
+	if err != nil {
+		return nil, err
+	}
+
+	ciphertext, err := base64URLDecode(parts[3])
+	if err != nil {
+		return nil, err
+	}
+
+	tag, err := base64URLDecode(parts[4])
+	if err != nil {
+		return nil, err
+	}
+
+	raw := &rawJSONWebEncryption{
+		Protected:    newBuffer(rawProtected),
+		EncryptedKey: newBuffer(encryptedKey),
+		Iv:           newBuffer(iv),
+		Ciphertext:   newBuffer(ciphertext),
+		Tag:          newBuffer(tag),
+	}
+
+	return raw.sanitized()
+}
+
+// CompactSerialize serializes an object using the compact serialization format.
+func (obj JSONWebEncryption) CompactSerialize() (string, error) {
+	if len(obj.recipients) != 1 || obj.unprotected != nil ||
+		obj.protected == nil || obj.recipients[0].header != nil {
+		return "", ErrNotSupported
+	}
+
+	serializedProtected := mustSerializeJSON(obj.protected)
+
+	return fmt.Sprintf(
+		"%s.%s.%s.%s.%s",
+		base64.RawURLEncoding.EncodeToString(serializedProtected),
+		base64.RawURLEncoding.EncodeToString(obj.recipients[0].encryptedKey),
+		base64.RawURLEncoding.EncodeToString(obj.iv),
+		base64.RawURLEncoding.EncodeToString(obj.ciphertext),
+		base64.RawURLEncoding.EncodeToString(obj.tag)), nil
+}
+
+// FullSerialize serializes an object using the full JSON serialization format.
+func (obj JSONWebEncryption) FullSerialize() string {
+	raw := rawJSONWebEncryption{
+		Unprotected:  obj.unprotected,
+		Iv:           newBuffer(obj.iv),
+		Ciphertext:   newBuffer(obj.ciphertext),
+		EncryptedKey: newBuffer(obj.recipients[0].encryptedKey),
+		Tag:          newBuffer(obj.tag),
+		Aad:          newBuffer(obj.aad),
+		Recipients:   []rawRecipientInfo{},
+	}
+
+	if len(obj.recipients) > 1 {
+		for _, recipient := range obj.recipients {
+			info := rawRecipientInfo{
+				Header:       recipient.header,
+				EncryptedKey: base64.RawURLEncoding.EncodeToString(recipient.encryptedKey),
+			}
+			raw.Recipients = append(raw.Recipients, info)
+		}
+	} else {
+		// Use flattened serialization
+		raw.Header = obj.recipients[0].header
+		raw.EncryptedKey = newBuffer(obj.recipients[0].encryptedKey)
+	}
+
+	if obj.protected != nil {
+		raw.Protected = newBuffer(mustSerializeJSON(obj.protected))
+	}
+
+	return string(mustSerializeJSON(raw))
+}

vendor/github.com/go-jose/go-jose/v3/jwk.go

@@ -0,0 +1,798 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"math/big"
+	"net/url"
+	"reflect"
+	"strings"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// rawJSONWebKey represents a public or private key in JWK format, used for parsing/serializing.
+type rawJSONWebKey struct {
+	Use string      `json:"use,omitempty"`
+	Kty string      `json:"kty,omitempty"`
+	Kid string      `json:"kid,omitempty"`
+	Crv string      `json:"crv,omitempty"`
+	Alg string      `json:"alg,omitempty"`
+	K   *byteBuffer `json:"k,omitempty"`
+	X   *byteBuffer `json:"x,omitempty"`
+	Y   *byteBuffer `json:"y,omitempty"`
+	N   *byteBuffer `json:"n,omitempty"`
+	E   *byteBuffer `json:"e,omitempty"`
+	// -- Following fields are only used for private keys --
+	// RSA uses D, P and Q, while ECDSA uses only D. Fields Dp, Dq, and Qi are
+	// completely optional. Therefore for RSA/ECDSA, D != nil is a contract that
+	// we have a private key whereas D == nil means we have only a public key.
+	D  *byteBuffer `json:"d,omitempty"`
+	P  *byteBuffer `json:"p,omitempty"`
+	Q  *byteBuffer `json:"q,omitempty"`
+	Dp *byteBuffer `json:"dp,omitempty"`
+	Dq *byteBuffer `json:"dq,omitempty"`
+	Qi *byteBuffer `json:"qi,omitempty"`
+	// Certificates
+	X5c       []string `json:"x5c,omitempty"`
+	X5u       string   `json:"x5u,omitempty"`
+	X5tSHA1   string   `json:"x5t,omitempty"`
+	X5tSHA256 string   `json:"x5t#S256,omitempty"`
+}
+
+// JSONWebKey represents a public or private key in JWK format.
+type JSONWebKey struct {
+	// Cryptographic key, can be a symmetric or asymmetric key.
+	Key interface{}
+	// Key identifier, parsed from `kid` header.
+	KeyID string
+	// Key algorithm, parsed from `alg` header.
+	Algorithm string
+	// Key use, parsed from `use` header.
+	Use string
+
+	// X.509 certificate chain, parsed from `x5c` header.
+	Certificates []*x509.Certificate
+	// X.509 certificate URL, parsed from `x5u` header.
+	CertificatesURL *url.URL
+	// X.509 certificate thumbprint (SHA-1), parsed from `x5t` header.
+	CertificateThumbprintSHA1 []byte
+	// X.509 certificate thumbprint (SHA-256), parsed from `x5t#S256` header.
+	CertificateThumbprintSHA256 []byte
+}
+
+// MarshalJSON serializes the given key to its JSON representation.
+func (k JSONWebKey) MarshalJSON() ([]byte, error) {
+	var raw *rawJSONWebKey
+	var err error
+
+	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		raw = fromEdPublicKey(key)
+	case *ecdsa.PublicKey:
+		raw, err = fromEcPublicKey(key)
+	case *rsa.PublicKey:
+		raw = fromRsaPublicKey(key)
+	case ed25519.PrivateKey:
+		raw, err = fromEdPrivateKey(key)
+	case *ecdsa.PrivateKey:
+		raw, err = fromEcPrivateKey(key)
+	case *rsa.PrivateKey:
+		raw, err = fromRsaPrivateKey(key)
+	case []byte:
+		raw, err = fromSymmetricKey(key)
+	default:
+		return nil, fmt.Errorf("go-jose/go-jose: unknown key type '%s'", reflect.TypeOf(key))
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	raw.Kid = k.KeyID
+	raw.Alg = k.Algorithm
+	raw.Use = k.Use
+
+	for _, cert := range k.Certificates {
+		raw.X5c = append(raw.X5c, base64.StdEncoding.EncodeToString(cert.Raw))
+	}
+
+	x5tSHA1Len := len(k.CertificateThumbprintSHA1)
+	x5tSHA256Len := len(k.CertificateThumbprintSHA256)
+	if x5tSHA1Len > 0 {
+		if x5tSHA1Len != sha1.Size {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid SHA-1 thumbprint (must be %d bytes, not %d)", sha1.Size, x5tSHA1Len)
+		}
+		raw.X5tSHA1 = base64.RawURLEncoding.EncodeToString(k.CertificateThumbprintSHA1)
+	}
+	if x5tSHA256Len > 0 {
+		if x5tSHA256Len != sha256.Size {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid SHA-256 thumbprint (must be %d bytes, not %d)", sha256.Size, x5tSHA256Len)
+		}
+		raw.X5tSHA256 = base64.RawURLEncoding.EncodeToString(k.CertificateThumbprintSHA256)
+	}
+
+	// If cert chain is attached (as opposed to being behind a URL), check the
+	// keys thumbprints to make sure they match what is expected. This is to
+	// ensure we don't accidentally produce a JWK with semantically inconsistent
+	// data in the headers.
+	if len(k.Certificates) > 0 {
+		expectedSHA1 := sha1.Sum(k.Certificates[0].Raw)
+		expectedSHA256 := sha256.Sum256(k.Certificates[0].Raw)
+
+		if len(k.CertificateThumbprintSHA1) > 0 && !bytes.Equal(k.CertificateThumbprintSHA1, expectedSHA1[:]) {
+			return nil, errors.New("go-jose/go-jose: invalid SHA-1 thumbprint, does not match cert chain")
+		}
+		if len(k.CertificateThumbprintSHA256) > 0 && !bytes.Equal(k.CertificateThumbprintSHA256, expectedSHA256[:]) {
+			return nil, errors.New("go-jose/go-jose: invalid or SHA-256 thumbprint, does not match cert chain")
+		}
+	}
+
+	if k.CertificatesURL != nil {
+		raw.X5u = k.CertificatesURL.String()
+	}
+
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON reads a key from its JSON representation.
+func (k *JSONWebKey) UnmarshalJSON(data []byte) (err error) {
+	var raw rawJSONWebKey
+	err = json.Unmarshal(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	certs, err := parseCertificateChain(raw.X5c)
+	if err != nil {
+		return fmt.Errorf("go-jose/go-jose: failed to unmarshal x5c field: %s", err)
+	}
+
+	var key interface{}
+	var certPub interface{}
+	var keyPub interface{}
+
+	if len(certs) > 0 {
+		// We need to check that leaf public key matches the key embedded in this
+		// JWK, as required by the standard (see RFC 7517, Section 4.7). Otherwise
+		// the JWK parsed could be semantically invalid. Technically, should also
+		// check key usage fields and other extensions on the cert here, but the
+		// standard doesn't exactly explain how they're supposed to map from the
+		// JWK representation to the X.509 extensions.
+		certPub = certs[0].PublicKey
+	}
+
+	switch raw.Kty {
+	case "EC":
+		if raw.D != nil {
+			key, err = raw.ecPrivateKey()
+			if err == nil {
+				keyPub = key.(*ecdsa.PrivateKey).Public()
+			}
+		} else {
+			key, err = raw.ecPublicKey()
+			keyPub = key
+		}
+	case "RSA":
+		if raw.D != nil {
+			key, err = raw.rsaPrivateKey()
+			if err == nil {
+				keyPub = key.(*rsa.PrivateKey).Public()
+			}
+		} else {
+			key, err = raw.rsaPublicKey()
+			keyPub = key
+		}
+	case "oct":
+		if certPub != nil {
+			return errors.New("go-jose/go-jose: invalid JWK, found 'oct' (symmetric) key with cert chain")
+		}
+		key, err = raw.symmetricKey()
+	case "OKP":
+		if raw.Crv == "Ed25519" && raw.X != nil {
+			if raw.D != nil {
+				key, err = raw.edPrivateKey()
+				if err == nil {
+					keyPub = key.(ed25519.PrivateKey).Public()
+				}
+			} else {
+				key, err = raw.edPublicKey()
+				keyPub = key
+			}
+		} else {
+			err = fmt.Errorf("go-jose/go-jose: unknown curve %s'", raw.Crv)
+		}
+	default:
+		err = fmt.Errorf("go-jose/go-jose: unknown json web key type '%s'", raw.Kty)
+	}
+
+	if err != nil {
+		return
+	}
+
+	if certPub != nil && keyPub != nil {
+		if !reflect.DeepEqual(certPub, keyPub) {
+			return errors.New("go-jose/go-jose: invalid JWK, public keys in key and x5c fields do not match")
+		}
+	}
+
+	*k = JSONWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use, Certificates: certs}
+
+	if raw.X5u != "" {
+		k.CertificatesURL, err = url.Parse(raw.X5u)
+		if err != nil {
+			return fmt.Errorf("go-jose/go-jose: invalid JWK, x5u header is invalid URL: %w", err)
+		}
+	}
+
+	// x5t parameters are base64url-encoded SHA thumbprints
+	// See RFC 7517, Section 4.8, https://tools.ietf.org/html/rfc7517#section-4.8
+	x5tSHA1bytes, err := base64URLDecode(raw.X5tSHA1)
+	if err != nil {
+		return errors.New("go-jose/go-jose: invalid JWK, x5t header has invalid encoding")
+	}
+
+	// RFC 7517, Section 4.8 is ambiguous as to whether the digest output should be byte or hex,
+	// for this reason, after base64 decoding, if the size is sha1.Size it's likely that the value is a byte encoded
+	// checksum so we skip this. Otherwise if the checksum was hex encoded we expect a 40 byte sized array so we'll
+	// try to hex decode it. When Marshalling this value we'll always use a base64 encoded version of byte format checksum.
+	if len(x5tSHA1bytes) == 2*sha1.Size {
+		hx, err := hex.DecodeString(string(x5tSHA1bytes))
+		if err != nil {
+			return fmt.Errorf("go-jose/go-jose: invalid JWK, unable to hex decode x5t: %v", err)
+
+		}
+		x5tSHA1bytes = hx
+	}
+
+	k.CertificateThumbprintSHA1 = x5tSHA1bytes
+
+	x5tSHA256bytes, err := base64URLDecode(raw.X5tSHA256)
+	if err != nil {
+		return errors.New("go-jose/go-jose: invalid JWK, x5t#S256 header has invalid encoding")
+	}
+
+	if len(x5tSHA256bytes) == 2*sha256.Size {
+		hx256, err := hex.DecodeString(string(x5tSHA256bytes))
+		if err != nil {
+			return fmt.Errorf("go-jose/go-jose: invalid JWK, unable to hex decode x5t#S256: %v", err)
+		}
+		x5tSHA256bytes = hx256
+	}
+
+	k.CertificateThumbprintSHA256 = x5tSHA256bytes
+
+	x5tSHA1Len := len(k.CertificateThumbprintSHA1)
+	x5tSHA256Len := len(k.CertificateThumbprintSHA256)
+	if x5tSHA1Len > 0 && x5tSHA1Len != sha1.Size {
+		return errors.New("go-jose/go-jose: invalid JWK, x5t header is of incorrect size")
+	}
+	if x5tSHA256Len > 0 && x5tSHA256Len != sha256.Size {
+		return errors.New("go-jose/go-jose: invalid JWK, x5t#S256 header is of incorrect size")
+	}
+
+	// If certificate chain *and* thumbprints are set, verify correctness.
+	if len(k.Certificates) > 0 {
+		leaf := k.Certificates[0]
+		sha1sum := sha1.Sum(leaf.Raw)
+		sha256sum := sha256.Sum256(leaf.Raw)
+
+		if len(k.CertificateThumbprintSHA1) > 0 && !bytes.Equal(sha1sum[:], k.CertificateThumbprintSHA1) {
+			return errors.New("go-jose/go-jose: invalid JWK, x5c thumbprint does not match x5t value")
+		}
+
+		if len(k.CertificateThumbprintSHA256) > 0 && !bytes.Equal(sha256sum[:], k.CertificateThumbprintSHA256) {
+			return errors.New("go-jose/go-jose: invalid JWK, x5c thumbprint does not match x5t#S256 value")
+		}
+	}
+
+	return
+}
+
+// JSONWebKeySet represents a JWK Set object.
+type JSONWebKeySet struct {
+	Keys []JSONWebKey `json:"keys"`
+}
+
+// Key convenience method returns keys by key ID. Specification states
+// that a JWK Set "SHOULD" use distinct key IDs, but allows for some
+// cases where they are not distinct. Hence method returns a slice
+// of JSONWebKeys.
+func (s *JSONWebKeySet) Key(kid string) []JSONWebKey {
+	var keys []JSONWebKey
+	for _, key := range s.Keys {
+		if key.KeyID == kid {
+			keys = append(keys, key)
+		}
+	}
+
+	return keys
+}
+
+const rsaThumbprintTemplate = `{"e":"%s","kty":"RSA","n":"%s"}`
+const ecThumbprintTemplate = `{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`
+const edThumbprintTemplate = `{"crv":"%s","kty":"OKP","x":"%s"}`
+
+func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
+	coordLength := curveSize(curve)
+	crv, err := curveName(curve)
+	if err != nil {
+		return "", err
+	}
+
+	if len(x.Bytes()) > coordLength || len(y.Bytes()) > coordLength {
+		return "", errors.New("go-jose/go-jose: invalid elliptic key (too large)")
+	}
+
+	return fmt.Sprintf(ecThumbprintTemplate, crv,
+		newFixedSizeBuffer(x.Bytes(), coordLength).base64(),
+		newFixedSizeBuffer(y.Bytes(), coordLength).base64()), nil
+}
+
+func rsaThumbprintInput(n *big.Int, e int) (string, error) {
+	return fmt.Sprintf(rsaThumbprintTemplate,
+		newBufferFromInt(uint64(e)).base64(),
+		newBuffer(n.Bytes()).base64()), nil
+}
+
+func edThumbprintInput(ed ed25519.PublicKey) (string, error) {
+	crv := "Ed25519"
+	if len(ed) > 32 {
+		return "", errors.New("go-jose/go-jose: invalid elliptic key (too large)")
+	}
+	return fmt.Sprintf(edThumbprintTemplate, crv,
+		newFixedSizeBuffer(ed, 32).base64()), nil
+}
+
+// Thumbprint computes the JWK Thumbprint of a key using the
+// indicated hash algorithm.
+func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
+	var input string
+	var err error
+	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		input, err = edThumbprintInput(key)
+	case *ecdsa.PublicKey:
+		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
+	case *ecdsa.PrivateKey:
+		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
+	case *rsa.PublicKey:
+		input, err = rsaThumbprintInput(key.N, key.E)
+	case *rsa.PrivateKey:
+		input, err = rsaThumbprintInput(key.N, key.E)
+	case ed25519.PrivateKey:
+		input, err = edThumbprintInput(ed25519.PublicKey(key[32:]))
+	default:
+		return nil, fmt.Errorf("go-jose/go-jose: unknown key type '%s'", reflect.TypeOf(key))
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	h := hash.New()
+	_, _ = h.Write([]byte(input))
+	return h.Sum(nil), nil
+}
+
+// IsPublic returns true if the JWK represents a public key (not symmetric, not private).
+func (k *JSONWebKey) IsPublic() bool {
+	switch k.Key.(type) {
+	case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
+		return true
+	default:
+		return false
+	}
+}
+
+// Public creates JSONWebKey with corresponding public key if JWK represents asymmetric private key.
+func (k *JSONWebKey) Public() JSONWebKey {
+	if k.IsPublic() {
+		return *k
+	}
+	ret := *k
+	switch key := k.Key.(type) {
+	case *ecdsa.PrivateKey:
+		ret.Key = key.Public()
+	case *rsa.PrivateKey:
+		ret.Key = key.Public()
+	case ed25519.PrivateKey:
+		ret.Key = key.Public()
+	default:
+		return JSONWebKey{} // returning invalid key
+	}
+	return ret
+}
+
+// Valid checks that the key contains the expected parameters.
+func (k *JSONWebKey) Valid() bool {
+	if k.Key == nil {
+		return false
+	}
+	switch key := k.Key.(type) {
+	case *ecdsa.PublicKey:
+		if key.Curve == nil || key.X == nil || key.Y == nil {
+			return false
+		}
+	case *ecdsa.PrivateKey:
+		if key.Curve == nil || key.X == nil || key.Y == nil || key.D == nil {
+			return false
+		}
+	case *rsa.PublicKey:
+		if key.N == nil || key.E == 0 {
+			return false
+		}
+	case *rsa.PrivateKey:
+		if key.N == nil || key.E == 0 || key.D == nil || len(key.Primes) < 2 {
+			return false
+		}
+	case ed25519.PublicKey:
+		if len(key) != 32 {
+			return false
+		}
+	case ed25519.PrivateKey:
+		if len(key) != 64 {
+			return false
+		}
+	default:
+		return false
+	}
+	return true
+}
+
+func (key rawJSONWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
+	if key.N == nil || key.E == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid RSA key, missing n/e values")
+	}
+
+	return &rsa.PublicKey{
+		N: key.N.bigInt(),
+		E: key.E.toInt(),
+	}, nil
+}
+
+func fromEdPublicKey(pub ed25519.PublicKey) *rawJSONWebKey {
+	return &rawJSONWebKey{
+		Kty: "OKP",
+		Crv: "Ed25519",
+		X:   newBuffer(pub),
+	}
+}
+
+func fromRsaPublicKey(pub *rsa.PublicKey) *rawJSONWebKey {
+	return &rawJSONWebKey{
+		Kty: "RSA",
+		N:   newBuffer(pub.N.Bytes()),
+		E:   newBufferFromInt(uint64(pub.E)),
+	}
+}
+
+func (key rawJSONWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
+	var curve elliptic.Curve
+	switch key.Crv {
+	case "P-256":
+		curve = elliptic.P256()
+	case "P-384":
+		curve = elliptic.P384()
+	case "P-521":
+		curve = elliptic.P521()
+	default:
+		return nil, fmt.Errorf("go-jose/go-jose: unsupported elliptic curve '%s'", key.Crv)
+	}
+
+	if key.X == nil || key.Y == nil {
+		return nil, errors.New("go-jose/go-jose: invalid EC key, missing x/y values")
+	}
+
+	// The length of this octet string MUST be the full size of a coordinate for
+	// the curve specified in the "crv" parameter.
+	// https://tools.ietf.org/html/rfc7518#section-6.2.1.2
+	if curveSize(curve) != len(key.X.data) {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC public key, wrong length for x")
+	}
+
+	if curveSize(curve) != len(key.Y.data) {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC public key, wrong length for y")
+	}
+
+	x := key.X.bigInt()
+	y := key.Y.bigInt()
+
+	if !curve.IsOnCurve(x, y) {
+		return nil, errors.New("go-jose/go-jose: invalid EC key, X/Y are not on declared curve")
+	}
+
+	return &ecdsa.PublicKey{
+		Curve: curve,
+		X:     x,
+		Y:     y,
+	}, nil
+}
+
+func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJSONWebKey, error) {
+	if pub == nil || pub.X == nil || pub.Y == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC key (nil, or X/Y missing)")
+	}
+
+	name, err := curveName(pub.Curve)
+	if err != nil {
+		return nil, err
+	}
+
+	size := curveSize(pub.Curve)
+
+	xBytes := pub.X.Bytes()
+	yBytes := pub.Y.Bytes()
+
+	if len(xBytes) > size || len(yBytes) > size {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC key (X/Y too large)")
+	}
+
+	key := &rawJSONWebKey{
+		Kty: "EC",
+		Crv: name,
+		X:   newFixedSizeBuffer(xBytes, size),
+		Y:   newFixedSizeBuffer(yBytes, size),
+	}
+
+	return key, nil
+}
+
+func (key rawJSONWebKey) edPrivateKey() (ed25519.PrivateKey, error) {
+	var missing []string
+	switch {
+	case key.D == nil:
+		missing = append(missing, "D")
+	case key.X == nil:
+		missing = append(missing, "X")
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid Ed25519 private key, missing %s value(s)", strings.Join(missing, ", "))
+	}
+
+	privateKey := make([]byte, ed25519.PrivateKeySize)
+	copy(privateKey[0:32], key.D.bytes())
+	copy(privateKey[32:], key.X.bytes())
+	rv := ed25519.PrivateKey(privateKey)
+	return rv, nil
+}
+
+func (key rawJSONWebKey) edPublicKey() (ed25519.PublicKey, error) {
+	if key.X == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid Ed key, missing x value")
+	}
+	publicKey := make([]byte, ed25519.PublicKeySize)
+	copy(publicKey[0:32], key.X.bytes())
+	rv := ed25519.PublicKey(publicKey)
+	return rv, nil
+}
+
+func (key rawJSONWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
+	var missing []string
+	switch {
+	case key.N == nil:
+		missing = append(missing, "N")
+	case key.E == nil:
+		missing = append(missing, "E")
+	case key.D == nil:
+		missing = append(missing, "D")
+	case key.P == nil:
+		missing = append(missing, "P")
+	case key.Q == nil:
+		missing = append(missing, "Q")
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid RSA private key, missing %s value(s)", strings.Join(missing, ", "))
+	}
+
+	rv := &rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: key.N.bigInt(),
+			E: key.E.toInt(),
+		},
+		D: key.D.bigInt(),
+		Primes: []*big.Int{
+			key.P.bigInt(),
+			key.Q.bigInt(),
+		},
+	}
+
+	if key.Dp != nil {
+		rv.Precomputed.Dp = key.Dp.bigInt()
+	}
+	if key.Dq != nil {
+		rv.Precomputed.Dq = key.Dq.bigInt()
+	}
+	if key.Qi != nil {
+		rv.Precomputed.Qinv = key.Qi.bigInt()
+	}
+
+	err := rv.Validate()
+	return rv, err
+}
+
+func fromEdPrivateKey(ed ed25519.PrivateKey) (*rawJSONWebKey, error) {
+	raw := fromEdPublicKey(ed25519.PublicKey(ed[32:]))
+
+	raw.D = newBuffer(ed[0:32])
+	return raw, nil
+}
+
+func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJSONWebKey, error) {
+	if len(rsa.Primes) != 2 {
+		return nil, ErrUnsupportedKeyType
+	}
+
+	raw := fromRsaPublicKey(&rsa.PublicKey)
+
+	raw.D = newBuffer(rsa.D.Bytes())
+	raw.P = newBuffer(rsa.Primes[0].Bytes())
+	raw.Q = newBuffer(rsa.Primes[1].Bytes())
+
+	if rsa.Precomputed.Dp != nil {
+		raw.Dp = newBuffer(rsa.Precomputed.Dp.Bytes())
+	}
+	if rsa.Precomputed.Dq != nil {
+		raw.Dq = newBuffer(rsa.Precomputed.Dq.Bytes())
+	}
+	if rsa.Precomputed.Qinv != nil {
+		raw.Qi = newBuffer(rsa.Precomputed.Qinv.Bytes())
+	}
+
+	return raw, nil
+}
+
+func (key rawJSONWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
+	var curve elliptic.Curve
+	switch key.Crv {
+	case "P-256":
+		curve = elliptic.P256()
+	case "P-384":
+		curve = elliptic.P384()
+	case "P-521":
+		curve = elliptic.P521()
+	default:
+		return nil, fmt.Errorf("go-jose/go-jose: unsupported elliptic curve '%s'", key.Crv)
+	}
+
+	if key.X == nil || key.Y == nil || key.D == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC private key, missing x/y/d values")
+	}
+
+	// The length of this octet string MUST be the full size of a coordinate for
+	// the curve specified in the "crv" parameter.
+	// https://tools.ietf.org/html/rfc7518#section-6.2.1.2
+	if curveSize(curve) != len(key.X.data) {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC private key, wrong length for x")
+	}
+
+	if curveSize(curve) != len(key.Y.data) {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC private key, wrong length for y")
+	}
+
+	// https://tools.ietf.org/html/rfc7518#section-6.2.2.1
+	if dSize(curve) != len(key.D.data) {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC private key, wrong length for d")
+	}
+
+	x := key.X.bigInt()
+	y := key.Y.bigInt()
+
+	if !curve.IsOnCurve(x, y) {
+		return nil, errors.New("go-jose/go-jose: invalid EC key, X/Y are not on declared curve")
+	}
+
+	return &ecdsa.PrivateKey{
+		PublicKey: ecdsa.PublicKey{
+			Curve: curve,
+			X:     x,
+			Y:     y,
+		},
+		D: key.D.bigInt(),
+	}, nil
+}
+
+func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJSONWebKey, error) {
+	raw, err := fromEcPublicKey(&ec.PublicKey)
+	if err != nil {
+		return nil, err
+	}
+
+	if ec.D == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid EC private key")
+	}
+
+	raw.D = newFixedSizeBuffer(ec.D.Bytes(), dSize(ec.PublicKey.Curve))
+
+	return raw, nil
+}
+
+// dSize returns the size in octets for the "d" member of an elliptic curve
+// private key.
+// The length of this octet string MUST be ceiling(log-base-2(n)/8)
+// octets (where n is the order of the curve).
+// https://tools.ietf.org/html/rfc7518#section-6.2.2.1
+func dSize(curve elliptic.Curve) int {
+	order := curve.Params().P
+	bitLen := order.BitLen()
+	size := bitLen / 8
+	if bitLen%8 != 0 {
+		size++
+	}
+	return size
+}
+
+func fromSymmetricKey(key []byte) (*rawJSONWebKey, error) {
+	return &rawJSONWebKey{
+		Kty: "oct",
+		K:   newBuffer(key),
+	}, nil
+}
+
+func (key rawJSONWebKey) symmetricKey() ([]byte, error) {
+	if key.K == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: invalid OCT (symmetric) key, missing k value")
+	}
+	return key.K.bytes(), nil
+}
+
+func tryJWKS(key interface{}, headers ...Header) interface{} {
+	var jwks JSONWebKeySet
+
+	switch jwksType := key.(type) {
+	case *JSONWebKeySet:
+		jwks = *jwksType
+	case JSONWebKeySet:
+		jwks = jwksType
+	default:
+		return key
+	}
+
+	var kid string
+	for _, header := range headers {
+		if header.KeyID != "" {
+			kid = header.KeyID
+			break
+		}
+	}
+
+	if kid == "" {
+		return key
+	}
+
+	keys := jwks.Key(kid)
+	if len(keys) == 0 {
+		return key
+	}
+
+	return keys[0].Key
+}

vendor/github.com/go-jose/go-jose/v3/jws.go

@@ -0,0 +1,366 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// rawJSONWebSignature represents a raw JWS JSON object. Used for parsing/serializing.
+type rawJSONWebSignature struct {
+	Payload    *byteBuffer        `json:"payload,omitempty"`
+	Signatures []rawSignatureInfo `json:"signatures,omitempty"`
+	Protected  *byteBuffer        `json:"protected,omitempty"`
+	Header     *rawHeader         `json:"header,omitempty"`
+	Signature  *byteBuffer        `json:"signature,omitempty"`
+}
+
+// rawSignatureInfo represents a single JWS signature over the JWS payload and protected header.
+type rawSignatureInfo struct {
+	Protected *byteBuffer `json:"protected,omitempty"`
+	Header    *rawHeader  `json:"header,omitempty"`
+	Signature *byteBuffer `json:"signature,omitempty"`
+}
+
+// JSONWebSignature represents a signed JWS object after parsing.
+type JSONWebSignature struct {
+	payload []byte
+	// Signatures attached to this object (may be more than one for multi-sig).
+	// Be careful about accessing these directly, prefer to use Verify() or
+	// VerifyMulti() to ensure that the data you're getting is verified.
+	Signatures []Signature
+}
+
+// Signature represents a single signature over the JWS payload and protected header.
+type Signature struct {
+	// Merged header fields. Contains both protected and unprotected header
+	// values. Prefer using Protected and Unprotected fields instead of this.
+	// Values in this header may or may not have been signed and in general
+	// should not be trusted.
+	Header Header
+
+	// Protected header. Values in this header were signed and
+	// will be verified as part of the signature verification process.
+	Protected Header
+
+	// Unprotected header. Values in this header were not signed
+	// and in general should not be trusted.
+	Unprotected Header
+
+	// The actual signature value
+	Signature []byte
+
+	protected *rawHeader
+	header    *rawHeader
+	original  *rawSignatureInfo
+}
+
+// ParseSigned parses a signed message in compact or JWS JSON Serialization format.
+func ParseSigned(signature string) (*JSONWebSignature, error) {
+	signature = stripWhitespace(signature)
+	if strings.HasPrefix(signature, "{") {
+		return parseSignedFull(signature)
+	}
+
+	return parseSignedCompact(signature, nil)
+}
+
+// ParseDetached parses a signed message in compact serialization format with detached payload.
+func ParseDetached(signature string, payload []byte) (*JSONWebSignature, error) {
+	if payload == nil {
+		return nil, errors.New("go-jose/go-jose: nil payload")
+	}
+	return parseSignedCompact(stripWhitespace(signature), payload)
+}
+
+// Get a header value
+func (sig Signature) mergedHeaders() rawHeader {
+	out := rawHeader{}
+	out.merge(sig.protected)
+	out.merge(sig.header)
+	return out
+}
+
+// Compute data to be signed
+func (obj JSONWebSignature) computeAuthData(payload []byte, signature *Signature) ([]byte, error) {
+	var authData bytes.Buffer
+
+	protectedHeader := new(rawHeader)
+
+	if signature.original != nil && signature.original.Protected != nil {
+		if err := json.Unmarshal(signature.original.Protected.bytes(), protectedHeader); err != nil {
+			return nil, err
+		}
+		authData.WriteString(signature.original.Protected.base64())
+	} else if signature.protected != nil {
+		protectedHeader = signature.protected
+		authData.WriteString(base64.RawURLEncoding.EncodeToString(mustSerializeJSON(protectedHeader)))
+	}
+
+	needsBase64 := true
+
+	if protectedHeader != nil {
+		var err error
+		if needsBase64, err = protectedHeader.getB64(); err != nil {
+			needsBase64 = true
+		}
+	}
+
+	authData.WriteByte('.')
+
+	if needsBase64 {
+		authData.WriteString(base64.RawURLEncoding.EncodeToString(payload))
+	} else {
+		authData.Write(payload)
+	}
+
+	return authData.Bytes(), nil
+}
+
+// parseSignedFull parses a message in full format.
+func parseSignedFull(input string) (*JSONWebSignature, error) {
+	var parsed rawJSONWebSignature
+	err := json.Unmarshal([]byte(input), &parsed)
+	if err != nil {
+		return nil, err
+	}
+
+	return parsed.sanitized()
+}
+
+// sanitized produces a cleaned-up JWS object from the raw JSON.
+func (parsed *rawJSONWebSignature) sanitized() (*JSONWebSignature, error) {
+	if parsed.Payload == nil {
+		return nil, fmt.Errorf("go-jose/go-jose: missing payload in JWS message")
+	}
+
+	obj := &JSONWebSignature{
+		payload:    parsed.Payload.bytes(),
+		Signatures: make([]Signature, len(parsed.Signatures)),
+	}
+
+	if len(parsed.Signatures) == 0 {
+		// No signatures array, must be flattened serialization
+		signature := Signature{}
+		if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
+			signature.protected = &rawHeader{}
+			err := json.Unmarshal(parsed.Protected.bytes(), signature.protected)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		// Check that there is not a nonce in the unprotected header
+		if parsed.Header != nil && parsed.Header.getNonce() != "" {
+			return nil, ErrUnprotectedNonce
+		}
+
+		signature.header = parsed.Header
+		signature.Signature = parsed.Signature.bytes()
+		// Make a fake "original" rawSignatureInfo to store the unprocessed
+		// Protected header. This is necessary because the Protected header can
+		// contain arbitrary fields not registered as part of the spec. See
+		// https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#section-4
+		// If we unmarshal Protected into a rawHeader with its explicit list of fields,
+		// we cannot marshal losslessly. So we have to keep around the original bytes.
+		// This is used in computeAuthData, which will first attempt to use
+		// the original bytes of a protected header, and fall back on marshaling the
+		// header struct only if those bytes are not available.
+		signature.original = &rawSignatureInfo{
+			Protected: parsed.Protected,
+			Header:    parsed.Header,
+			Signature: parsed.Signature,
+		}
+
+		var err error
+		signature.Header, err = signature.mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if signature.header != nil {
+			signature.Unprotected, err = signature.header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if signature.protected != nil {
+			signature.Protected, err = signature.protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.
+		jwk := signature.Header.JSONWebKey
+		if jwk != nil && (!jwk.Valid() || !jwk.IsPublic()) {
+			return nil, errors.New("go-jose/go-jose: invalid embedded jwk, must be public key")
+		}
+
+		obj.Signatures = append(obj.Signatures, signature)
+	}
+
+	for i, sig := range parsed.Signatures {
+		if sig.Protected != nil && len(sig.Protected.bytes()) > 0 {
+			obj.Signatures[i].protected = &rawHeader{}
+			err := json.Unmarshal(sig.Protected.bytes(), obj.Signatures[i].protected)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		// Check that there is not a nonce in the unprotected header
+		if sig.Header != nil && sig.Header.getNonce() != "" {
+			return nil, ErrUnprotectedNonce
+		}
+
+		var err error
+		obj.Signatures[i].Header, err = obj.Signatures[i].mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if obj.Signatures[i].header != nil {
+			obj.Signatures[i].Unprotected, err = obj.Signatures[i].header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if obj.Signatures[i].protected != nil {
+			obj.Signatures[i].Protected, err = obj.Signatures[i].protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		obj.Signatures[i].Signature = sig.Signature.bytes()
+
+		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.
+		jwk := obj.Signatures[i].Header.JSONWebKey
+		if jwk != nil && (!jwk.Valid() || !jwk.IsPublic()) {
+			return nil, errors.New("go-jose/go-jose: invalid embedded jwk, must be public key")
+		}
+
+		// Copy value of sig
+		original := sig
+
+		obj.Signatures[i].header = sig.Header
+		obj.Signatures[i].original = &original
+	}
+
+	return obj, nil
+}
+
+// parseSignedCompact parses a message in compact format.
+func parseSignedCompact(input string, payload []byte) (*JSONWebSignature, error) {
+	parts := strings.Split(input, ".")
+	if len(parts) != 3 {
+		return nil, fmt.Errorf("go-jose/go-jose: compact JWS format must have three parts")
+	}
+
+	if parts[1] != "" && payload != nil {
+		return nil, fmt.Errorf("go-jose/go-jose: payload is not detached")
+	}
+
+	rawProtected, err := base64URLDecode(parts[0])
+	if err != nil {
+		return nil, err
+	}
+
+	if payload == nil {
+		payload, err = base64URLDecode(parts[1])
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	signature, err := base64URLDecode(parts[2])
+	if err != nil {
+		return nil, err
+	}
+
+	raw := &rawJSONWebSignature{
+		Payload:   newBuffer(payload),
+		Protected: newBuffer(rawProtected),
+		Signature: newBuffer(signature),
+	}
+	return raw.sanitized()
+}
+
+func (obj JSONWebSignature) compactSerialize(detached bool) (string, error) {
+	if len(obj.Signatures) != 1 || obj.Signatures[0].header != nil || obj.Signatures[0].protected == nil {
+		return "", ErrNotSupported
+	}
+
+	serializedProtected := base64.RawURLEncoding.EncodeToString(mustSerializeJSON(obj.Signatures[0].protected))
+	payload := ""
+	signature := base64.RawURLEncoding.EncodeToString(obj.Signatures[0].Signature)
+
+	if !detached {
+		payload = base64.RawURLEncoding.EncodeToString(obj.payload)
+	}
+
+	return fmt.Sprintf("%s.%s.%s", serializedProtected, payload, signature), nil
+}
+
+// CompactSerialize serializes an object using the compact serialization format.
+func (obj JSONWebSignature) CompactSerialize() (string, error) {
+	return obj.compactSerialize(false)
+}
+
+// DetachedCompactSerialize serializes an object using the compact serialization format with detached payload.
+func (obj JSONWebSignature) DetachedCompactSerialize() (string, error) {
+	return obj.compactSerialize(true)
+}
+
+// FullSerialize serializes an object using the full JSON serialization format.
+func (obj JSONWebSignature) FullSerialize() string {
+	raw := rawJSONWebSignature{
+		Payload: newBuffer(obj.payload),
+	}
+
+	if len(obj.Signatures) == 1 {
+		if obj.Signatures[0].protected != nil {
+			serializedProtected := mustSerializeJSON(obj.Signatures[0].protected)
+			raw.Protected = newBuffer(serializedProtected)
+		}
+		raw.Header = obj.Signatures[0].header
+		raw.Signature = newBuffer(obj.Signatures[0].Signature)
+	} else {
+		raw.Signatures = make([]rawSignatureInfo, len(obj.Signatures))
+		for i, signature := range obj.Signatures {
+			raw.Signatures[i] = rawSignatureInfo{
+				Header:    signature.header,
+				Signature: newBuffer(signature.Signature),
+			}
+
+			if signature.protected != nil {
+				raw.Signatures[i].Protected = newBuffer(mustSerializeJSON(signature.protected))
+			}
+		}
+	}
+
+	return string(mustSerializeJSON(raw))
+}

vendor/github.com/go-jose/go-jose/v3/jwt/builder.go

@@ -0,0 +1,334 @@
+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"bytes"
+	"reflect"
+
+	"github.com/go-jose/go-jose/v3/json"
+
+	"github.com/go-jose/go-jose/v3"
+)
+
+// Builder is a utility for making JSON Web Tokens. Calls can be chained, and
+// errors are accumulated until the final call to CompactSerialize/FullSerialize.
+type Builder interface {
+	// Claims encodes claims into JWE/JWS form. Multiple calls will merge claims
+	// into single JSON object. If you are passing private claims, make sure to set
+	// struct field tags to specify the name for the JSON key to be used when
+	// serializing.
+	Claims(i interface{}) Builder
+	// Token builds a JSONWebToken from provided data.
+	Token() (*JSONWebToken, error)
+	// FullSerialize serializes a token using the JWS/JWE JSON Serialization format.
+	FullSerialize() (string, error)
+	// CompactSerialize serializes a token using the compact serialization format.
+	CompactSerialize() (string, error)
+}
+
+// NestedBuilder is a utility for making Signed-Then-Encrypted JSON Web Tokens.
+// Calls can be chained, and errors are accumulated until final call to
+// CompactSerialize/FullSerialize.
+type NestedBuilder interface {
+	// Claims encodes claims into JWE/JWS form. Multiple calls will merge claims
+	// into single JSON object. If you are passing private claims, make sure to set
+	// struct field tags to specify the name for the JSON key to be used when
+	// serializing.
+	Claims(i interface{}) NestedBuilder
+	// Token builds a NestedJSONWebToken from provided data.
+	Token() (*NestedJSONWebToken, error)
+	// FullSerialize serializes a token using the JSON Serialization format.
+	FullSerialize() (string, error)
+	// CompactSerialize serializes a token using the compact serialization format.
+	CompactSerialize() (string, error)
+}
+
+type builder struct {
+	payload map[string]interface{}
+	err     error
+}
+
+type signedBuilder struct {
+	builder
+	sig jose.Signer
+}
+
+type encryptedBuilder struct {
+	builder
+	enc jose.Encrypter
+}
+
+type nestedBuilder struct {
+	builder
+	sig jose.Signer
+	enc jose.Encrypter
+}
+
+// Signed creates builder for signed tokens.
+func Signed(sig jose.Signer) Builder {
+	return &signedBuilder{
+		sig: sig,
+	}
+}
+
+// Encrypted creates builder for encrypted tokens.
+func Encrypted(enc jose.Encrypter) Builder {
+	return &encryptedBuilder{
+		enc: enc,
+	}
+}
+
+// SignedAndEncrypted creates builder for signed-then-encrypted tokens.
+// ErrInvalidContentType will be returned if encrypter doesn't have JWT content type.
+func SignedAndEncrypted(sig jose.Signer, enc jose.Encrypter) NestedBuilder {
+	if contentType, _ := enc.Options().ExtraHeaders[jose.HeaderContentType].(jose.ContentType); contentType != "JWT" {
+		return &nestedBuilder{
+			builder: builder{
+				err: ErrInvalidContentType,
+			},
+		}
+	}
+	return &nestedBuilder{
+		sig: sig,
+		enc: enc,
+	}
+}
+
+func (b builder) claims(i interface{}) builder {
+	if b.err != nil {
+		return b
+	}
+
+	m, ok := i.(map[string]interface{})
+	switch {
+	case ok:
+		return b.merge(m)
+	case reflect.Indirect(reflect.ValueOf(i)).Kind() == reflect.Struct:
+		m, err := normalize(i)
+		if err != nil {
+			return builder{
+				err: err,
+			}
+		}
+		return b.merge(m)
+	default:
+		return builder{
+			err: ErrInvalidClaims,
+		}
+	}
+}
+
+func normalize(i interface{}) (map[string]interface{}, error) {
+	m := make(map[string]interface{})
+
+	raw, err := json.Marshal(i)
+	if err != nil {
+		return nil, err
+	}
+
+	d := json.NewDecoder(bytes.NewReader(raw))
+	d.SetNumberType(json.UnmarshalJSONNumber)
+
+	if err := d.Decode(&m); err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}
+
+func (b *builder) merge(m map[string]interface{}) builder {
+	p := make(map[string]interface{})
+	for k, v := range b.payload {
+		p[k] = v
+	}
+	for k, v := range m {
+		p[k] = v
+	}
+
+	return builder{
+		payload: p,
+	}
+}
+
+func (b *builder) token(p func(interface{}) ([]byte, error), h []jose.Header) (*JSONWebToken, error) {
+	return &JSONWebToken{
+		payload: p,
+		Headers: h,
+	}, nil
+}
+
+func (b *signedBuilder) Claims(i interface{}) Builder {
+	return &signedBuilder{
+		builder: b.builder.claims(i),
+		sig:     b.sig,
+	}
+}
+
+func (b *signedBuilder) Token() (*JSONWebToken, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return nil, err
+	}
+
+	h := make([]jose.Header, len(sig.Signatures))
+	for i, v := range sig.Signatures {
+		h[i] = v.Header
+	}
+
+	return b.builder.token(sig.Verify, h)
+}
+
+func (b *signedBuilder) CompactSerialize() (string, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return "", err
+	}
+
+	return sig.CompactSerialize()
+}
+
+func (b *signedBuilder) FullSerialize() (string, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return "", err
+	}
+
+	return sig.FullSerialize(), nil
+}
+
+func (b *signedBuilder) sign() (*jose.JSONWebSignature, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.sig.Sign(p)
+}
+
+func (b *encryptedBuilder) Claims(i interface{}) Builder {
+	return &encryptedBuilder{
+		builder: b.builder.claims(i),
+		enc:     b.enc,
+	}
+}
+
+func (b *encryptedBuilder) CompactSerialize() (string, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.CompactSerialize()
+}
+
+func (b *encryptedBuilder) FullSerialize() (string, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.FullSerialize(), nil
+}
+
+func (b *encryptedBuilder) Token() (*JSONWebToken, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return nil, err
+	}
+
+	return b.builder.token(enc.Decrypt, []jose.Header{enc.Header})
+}
+
+func (b *encryptedBuilder) encrypt() (*jose.JSONWebEncryption, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.enc.Encrypt(p)
+}
+
+func (b *nestedBuilder) Claims(i interface{}) NestedBuilder {
+	return &nestedBuilder{
+		builder: b.builder.claims(i),
+		sig:     b.sig,
+		enc:     b.enc,
+	}
+}
+
+func (b *nestedBuilder) Token() (*NestedJSONWebToken, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return nil, err
+	}
+
+	return &NestedJSONWebToken{
+		enc:     enc,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}
+
+func (b *nestedBuilder) CompactSerialize() (string, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.CompactSerialize()
+}
+
+func (b *nestedBuilder) FullSerialize() (string, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.FullSerialize(), nil
+}
+
+func (b *nestedBuilder) signAndEncrypt() (*jose.JSONWebEncryption, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	sig, err := b.sig.Sign(p)
+	if err != nil {
+		return nil, err
+	}
+
+	p2, err := sig.CompactSerialize()
+	if err != nil {
+		return nil, err
+	}
+
+	return b.enc.Encrypt([]byte(p2))
+}

vendor/github.com/go-jose/go-jose/v3/jwt/claims.go

@@ -0,0 +1,130 @@
+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// Claims represents public claim values (as specified in RFC 7519).
+type Claims struct {
+	Issuer    string       `json:"iss,omitempty"`
+	Subject   string       `json:"sub,omitempty"`
+	Audience  Audience     `json:"aud,omitempty"`
+	Expiry    *NumericDate `json:"exp,omitempty"`
+	NotBefore *NumericDate `json:"nbf,omitempty"`
+	IssuedAt  *NumericDate `json:"iat,omitempty"`
+	ID        string       `json:"jti,omitempty"`
+}
+
+// NumericDate represents date and time as the number of seconds since the
+// epoch, ignoring leap seconds. Non-integer values can be represented
+// in the serialized format, but we round to the nearest second.
+// See RFC7519 Section 2: https://tools.ietf.org/html/rfc7519#section-2
+type NumericDate int64
+
+// NewNumericDate constructs NumericDate from time.Time value.
+func NewNumericDate(t time.Time) *NumericDate {
+	if t.IsZero() {
+		return nil
+	}
+
+	// While RFC 7519 technically states that NumericDate values may be
+	// non-integer values, we don't bother serializing timestamps in
+	// claims with sub-second accurancy and just round to the nearest
+	// second instead. Not convined sub-second accuracy is useful here.
+	out := NumericDate(t.Unix())
+	return &out
+}
+
+// MarshalJSON serializes the given NumericDate into its JSON representation.
+func (n NumericDate) MarshalJSON() ([]byte, error) {
+	return []byte(strconv.FormatInt(int64(n), 10)), nil
+}
+
+// UnmarshalJSON reads a date from its JSON representation.
+func (n *NumericDate) UnmarshalJSON(b []byte) error {
+	s := string(b)
+
+	f, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		return ErrUnmarshalNumericDate
+	}
+
+	*n = NumericDate(f)
+	return nil
+}
+
+// Time returns time.Time representation of NumericDate.
+func (n *NumericDate) Time() time.Time {
+	if n == nil {
+		return time.Time{}
+	}
+	return time.Unix(int64(*n), 0)
+}
+
+// Audience represents the recipients that the token is intended for.
+type Audience []string
+
+// UnmarshalJSON reads an audience from its JSON representation.
+func (s *Audience) UnmarshalJSON(b []byte) error {
+	var v interface{}
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+
+	switch v := v.(type) {
+	case string:
+		*s = []string{v}
+	case []interface{}:
+		a := make([]string, len(v))
+		for i, e := range v {
+			s, ok := e.(string)
+			if !ok {
+				return ErrUnmarshalAudience
+			}
+			a[i] = s
+		}
+		*s = a
+	default:
+		return ErrUnmarshalAudience
+	}
+
+	return nil
+}
+
+// MarshalJSON converts audience to json representation.
+func (s Audience) MarshalJSON() ([]byte, error) {
+	if len(s) == 1 {
+		return json.Marshal(s[0])
+	}
+	return json.Marshal([]string(s))
+}
+
+//Contains checks whether a given string is included in the Audience
+func (s Audience) Contains(v string) bool {
+	for _, a := range s {
+		if a == v {
+			return true
+		}
+	}
+	return false
+}

vendor/github.com/go-jose/go-jose/v3/jwt/doc.go

@@ -0,0 +1,22 @@
+/*-
+ * Copyright 2017 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+
+Package jwt provides an implementation of the JSON Web Token standard.
+
+*/
+package jwt

vendor/github.com/go-jose/go-jose/v3/jwt/errors.go

@@ -0,0 +1,53 @@
+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import "errors"
+
+// ErrUnmarshalAudience indicates that aud claim could not be unmarshalled.
+var ErrUnmarshalAudience = errors.New("go-jose/go-jose/jwt: expected string or array value to unmarshal to Audience")
+
+// ErrUnmarshalNumericDate indicates that JWT NumericDate could not be unmarshalled.
+var ErrUnmarshalNumericDate = errors.New("go-jose/go-jose/jwt: expected number value to unmarshal NumericDate")
+
+// ErrInvalidClaims indicates that given claims have invalid type.
+var ErrInvalidClaims = errors.New("go-jose/go-jose/jwt: expected claims to be value convertible into JSON object")
+
+// ErrInvalidIssuer indicates invalid iss claim.
+var ErrInvalidIssuer = errors.New("go-jose/go-jose/jwt: validation failed, invalid issuer claim (iss)")
+
+// ErrInvalidSubject indicates invalid sub claim.
+var ErrInvalidSubject = errors.New("go-jose/go-jose/jwt: validation failed, invalid subject claim (sub)")
+
+// ErrInvalidAudience indicated invalid aud claim.
+var ErrInvalidAudience = errors.New("go-jose/go-jose/jwt: validation failed, invalid audience claim (aud)")
+
+// ErrInvalidID indicates invalid jti claim.
+var ErrInvalidID = errors.New("go-jose/go-jose/jwt: validation failed, invalid ID claim (jti)")
+
+// ErrNotValidYet indicates that token is used before time indicated in nbf claim.
+var ErrNotValidYet = errors.New("go-jose/go-jose/jwt: validation failed, token not valid yet (nbf)")
+
+// ErrExpired indicates that token is used after expiry time indicated in exp claim.
+var ErrExpired = errors.New("go-jose/go-jose/jwt: validation failed, token is expired (exp)")
+
+// ErrIssuedInTheFuture indicates that the iat field is in the future.
+var ErrIssuedInTheFuture = errors.New("go-jose/go-jose/jwt: validation field, token issued in the future (iat)")
+
+// ErrInvalidContentType indicates that token requires JWT cty header.
+var ErrInvalidContentType = errors.New("go-jose/go-jose/jwt: expected content type to be JWT (cty header)")

vendor/github.com/go-jose/go-jose/v3/jwt/jwt.go

@@ -0,0 +1,133 @@
+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"fmt"
+	"strings"
+
+	jose "github.com/go-jose/go-jose/v3"
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// JSONWebToken represents a JSON Web Token (as specified in RFC7519).
+type JSONWebToken struct {
+	payload           func(k interface{}) ([]byte, error)
+	unverifiedPayload func() []byte
+	Headers           []jose.Header
+}
+
+type NestedJSONWebToken struct {
+	enc     *jose.JSONWebEncryption
+	Headers []jose.Header
+}
+
+// Claims deserializes a JSONWebToken into dest using the provided key.
+func (t *JSONWebToken) Claims(key interface{}, dest ...interface{}) error {
+	b, err := t.payload(key)
+	if err != nil {
+		return err
+	}
+
+	for _, d := range dest {
+		if err := json.Unmarshal(b, d); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// UnsafeClaimsWithoutVerification deserializes the claims of a
+// JSONWebToken into the dests. For signed JWTs, the claims are not
+// verified. This function won't work for encrypted JWTs.
+func (t *JSONWebToken) UnsafeClaimsWithoutVerification(dest ...interface{}) error {
+	if t.unverifiedPayload == nil {
+		return fmt.Errorf("go-jose/go-jose: Cannot get unverified claims")
+	}
+	claims := t.unverifiedPayload()
+	for _, d := range dest {
+		if err := json.Unmarshal(claims, d); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (t *NestedJSONWebToken) Decrypt(decryptionKey interface{}) (*JSONWebToken, error) {
+	b, err := t.enc.Decrypt(decryptionKey)
+	if err != nil {
+		return nil, err
+	}
+
+	sig, err := ParseSigned(string(b))
+	if err != nil {
+		return nil, err
+	}
+
+	return sig, nil
+}
+
+// ParseSigned parses token from JWS form.
+func ParseSigned(s string) (*JSONWebToken, error) {
+	sig, err := jose.ParseSigned(s)
+	if err != nil {
+		return nil, err
+	}
+	headers := make([]jose.Header, len(sig.Signatures))
+	for i, signature := range sig.Signatures {
+		headers[i] = signature.Header
+	}
+
+	return &JSONWebToken{
+		payload:           sig.Verify,
+		unverifiedPayload: sig.UnsafePayloadWithoutVerification,
+		Headers:           headers,
+	}, nil
+}
+
+// ParseEncrypted parses token from JWE form.
+func ParseEncrypted(s string) (*JSONWebToken, error) {
+	enc, err := jose.ParseEncrypted(s)
+	if err != nil {
+		return nil, err
+	}
+
+	return &JSONWebToken{
+		payload: enc.Decrypt,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}
+
+// ParseSignedAndEncrypted parses signed-then-encrypted token from JWE form.
+func ParseSignedAndEncrypted(s string) (*NestedJSONWebToken, error) {
+	enc, err := jose.ParseEncrypted(s)
+	if err != nil {
+		return nil, err
+	}
+
+	contentType, _ := enc.Header.ExtraHeaders[jose.HeaderContentType].(string)
+	if strings.ToUpper(contentType) != "JWT" {
+		return nil, ErrInvalidContentType
+	}
+
+	return &NestedJSONWebToken{
+		enc:     enc,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}

vendor/github.com/go-jose/go-jose/v3/jwt/validation.go

@@ -0,0 +1,120 @@
+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import "time"
+
+const (
+	// DefaultLeeway defines the default leeway for matching NotBefore/Expiry claims.
+	DefaultLeeway = 1.0 * time.Minute
+)
+
+// Expected defines values used for protected claims validation.
+// If field has zero value then validation is skipped, with the exception of
+// Time, where the zero value means "now." To skip validating them, set the
+// corresponding field in the Claims struct to nil.
+type Expected struct {
+	// Issuer matches the "iss" claim exactly.
+	Issuer string
+	// Subject matches the "sub" claim exactly.
+	Subject string
+	// Audience matches the values in "aud" claim, regardless of their order.
+	Audience Audience
+	// ID matches the "jti" claim exactly.
+	ID string
+	// Time matches the "exp", "nbf" and "iat" claims with leeway.
+	Time time.Time
+}
+
+// WithTime copies expectations with new time.
+func (e Expected) WithTime(t time.Time) Expected {
+	e.Time = t
+	return e
+}
+
+// Validate checks claims in a token against expected values.
+// A default leeway value of one minute is used to compare time values.
+//
+// The default leeway will cause the token to be deemed valid until one
+// minute after the expiration time. If you're a server application that
+// wants to give an extra minute to client tokens, use this
+// function. If you're a client application wondering if the server
+// will accept your token, use ValidateWithLeeway with a leeway <=0,
+// otherwise this function might make you think a token is valid when
+// it is not.
+func (c Claims) Validate(e Expected) error {
+	return c.ValidateWithLeeway(e, DefaultLeeway)
+}
+
+// ValidateWithLeeway checks claims in a token against expected values. A
+// custom leeway may be specified for comparing time values. You may pass a
+// zero value to check time values with no leeway, but you should note that
+// numeric date values are rounded to the nearest second and sub-second
+// precision is not supported.
+//
+// The leeway gives some extra time to the token from the server's
+// point of view. That is, if the token is expired, ValidateWithLeeway
+// will still accept the token for 'leeway' amount of time. This fails
+// if you're using this function to check if a server will accept your
+// token, because it will think the token is valid even after it
+// expires. So if you're a client validating if the token is valid to
+// be submitted to a server, use leeway <=0, if you're a server
+// validation a token, use leeway >=0.
+func (c Claims) ValidateWithLeeway(e Expected, leeway time.Duration) error {
+	if e.Issuer != "" && e.Issuer != c.Issuer {
+		return ErrInvalidIssuer
+	}
+
+	if e.Subject != "" && e.Subject != c.Subject {
+		return ErrInvalidSubject
+	}
+
+	if e.ID != "" && e.ID != c.ID {
+		return ErrInvalidID
+	}
+
+	if len(e.Audience) != 0 {
+		for _, v := range e.Audience {
+			if !c.Audience.Contains(v) {
+				return ErrInvalidAudience
+			}
+		}
+	}
+
+	// validate using the e.Time, or time.Now if not provided
+	validationTime := e.Time
+	if validationTime.IsZero() {
+		validationTime = time.Now()
+	}
+
+	if c.NotBefore != nil && validationTime.Add(leeway).Before(c.NotBefore.Time()) {
+		return ErrNotValidYet
+	}
+
+	if c.Expiry != nil && validationTime.Add(-leeway).After(c.Expiry.Time()) {
+		return ErrExpired
+	}
+
+	// IssuedAt is optional but cannot be in the future. This is not required by the RFC, but
+	// something is misconfigured if this happens and we should not trust it.
+	if c.IssuedAt != nil && validationTime.Add(leeway).Before(c.IssuedAt.Time()) {
+		return ErrIssuedInTheFuture
+	}
+
+	return nil
+}

vendor/github.com/go-jose/go-jose/v3/opaque.go

@@ -0,0 +1,144 @@
+/*-
+ * Copyright 2018 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+// OpaqueSigner is an interface that supports signing payloads with opaque
+// private key(s). Private key operations performed by implementers may, for
+// example, occur in a hardware module. An OpaqueSigner may rotate signing keys
+// transparently to the user of this interface.
+type OpaqueSigner interface {
+	// Public returns the public key of the current signing key.
+	Public() *JSONWebKey
+	// Algs returns a list of supported signing algorithms.
+	Algs() []SignatureAlgorithm
+	// SignPayload signs a payload with the current signing key using the given
+	// algorithm.
+	SignPayload(payload []byte, alg SignatureAlgorithm) ([]byte, error)
+}
+
+type opaqueSigner struct {
+	signer OpaqueSigner
+}
+
+func newOpaqueSigner(alg SignatureAlgorithm, signer OpaqueSigner) (recipientSigInfo, error) {
+	var algSupported bool
+	for _, salg := range signer.Algs() {
+		if alg == salg {
+			algSupported = true
+			break
+		}
+	}
+	if !algSupported {
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg:    alg,
+		publicKey: signer.Public,
+		signer: &opaqueSigner{
+			signer: signer,
+		},
+	}, nil
+}
+
+func (o *opaqueSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	out, err := o.signer.SignPayload(payload, alg)
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// OpaqueVerifier is an interface that supports verifying payloads with opaque
+// public key(s). An OpaqueSigner may rotate signing keys transparently to the
+// user of this interface.
+type OpaqueVerifier interface {
+	VerifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error
+}
+
+type opaqueVerifier struct {
+	verifier OpaqueVerifier
+}
+
+func (o *opaqueVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	return o.verifier.VerifyPayload(payload, signature, alg)
+}
+
+// OpaqueKeyEncrypter is an interface that supports encrypting keys with an opaque key.
+type OpaqueKeyEncrypter interface {
+	// KeyID returns the kid
+	KeyID() string
+	// Algs returns a list of supported key encryption algorithms.
+	Algs() []KeyAlgorithm
+	// encryptKey encrypts the CEK using the given algorithm.
+	encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error)
+}
+
+type opaqueKeyEncrypter struct {
+	encrypter OpaqueKeyEncrypter
+}
+
+func newOpaqueKeyEncrypter(alg KeyAlgorithm, encrypter OpaqueKeyEncrypter) (recipientKeyInfo, error) {
+	var algSupported bool
+	for _, salg := range encrypter.Algs() {
+		if alg == salg {
+			algSupported = true
+			break
+		}
+	}
+	if !algSupported {
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientKeyInfo{
+		keyID:  encrypter.KeyID(),
+		keyAlg: alg,
+		keyEncrypter: &opaqueKeyEncrypter{
+			encrypter: encrypter,
+		},
+	}, nil
+}
+
+func (oke *opaqueKeyEncrypter) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	return oke.encrypter.encryptKey(cek, alg)
+}
+
+//OpaqueKeyDecrypter is an interface that supports decrypting keys with an opaque key.
+type OpaqueKeyDecrypter interface {
+	DecryptKey(encryptedKey []byte, header Header) ([]byte, error)
+}
+
+type opaqueKeyDecrypter struct {
+	decrypter OpaqueKeyDecrypter
+}
+
+func (okd *opaqueKeyDecrypter) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	mergedHeaders := rawHeader{}
+	mergedHeaders.merge(&headers)
+	mergedHeaders.merge(recipient.header)
+
+	header, err := mergedHeaders.sanitized()
+	if err != nil {
+		return nil, err
+	}
+
+	return okd.decrypter.DecryptKey(recipient.encryptedKey, header)
+}

vendor/github.com/go-jose/go-jose/v3/shared.go

@@ -0,0 +1,520 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/elliptic"
+	"crypto/x509"
+	"encoding/base64"
+	"errors"
+	"fmt"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// KeyAlgorithm represents a key management algorithm.
+type KeyAlgorithm string
+
+// SignatureAlgorithm represents a signature (or MAC) algorithm.
+type SignatureAlgorithm string
+
+// ContentEncryption represents a content encryption algorithm.
+type ContentEncryption string
+
+// CompressionAlgorithm represents an algorithm used for plaintext compression.
+type CompressionAlgorithm string
+
+// ContentType represents type of the contained data.
+type ContentType string
+
+var (
+	// ErrCryptoFailure represents an error in cryptographic primitive. This
+	// occurs when, for example, a message had an invalid authentication tag or
+	// could not be decrypted.
+	ErrCryptoFailure = errors.New("go-jose/go-jose: error in cryptographic primitive")
+
+	// ErrUnsupportedAlgorithm indicates that a selected algorithm is not
+	// supported. This occurs when trying to instantiate an encrypter for an
+	// algorithm that is not yet implemented.
+	ErrUnsupportedAlgorithm = errors.New("go-jose/go-jose: unknown/unsupported algorithm")
+
+	// ErrUnsupportedKeyType indicates that the given key type/format is not
+	// supported. This occurs when trying to instantiate an encrypter and passing
+	// it a key of an unrecognized type or with unsupported parameters, such as
+	// an RSA private key with more than two primes.
+	ErrUnsupportedKeyType = errors.New("go-jose/go-jose: unsupported key type/format")
+
+	// ErrInvalidKeySize indicates that the given key is not the correct size
+	// for the selected algorithm. This can occur, for example, when trying to
+	// encrypt with AES-256 but passing only a 128-bit key as input.
+	ErrInvalidKeySize = errors.New("go-jose/go-jose: invalid key size for algorithm")
+
+	// ErrNotSupported serialization of object is not supported. This occurs when
+	// trying to compact-serialize an object which can't be represented in
+	// compact form.
+	ErrNotSupported = errors.New("go-jose/go-jose: compact serialization not supported for object")
+
+	// ErrUnprotectedNonce indicates that while parsing a JWS or JWE object, a
+	// nonce header parameter was included in an unprotected header object.
+	ErrUnprotectedNonce = errors.New("go-jose/go-jose: Nonce parameter included in unprotected header")
+)
+
+// Key management algorithms
+const (
+	ED25519            = KeyAlgorithm("ED25519")
+	RSA1_5             = KeyAlgorithm("RSA1_5")             // RSA-PKCS1v1.5
+	RSA_OAEP           = KeyAlgorithm("RSA-OAEP")           // RSA-OAEP-SHA1
+	RSA_OAEP_256       = KeyAlgorithm("RSA-OAEP-256")       // RSA-OAEP-SHA256
+	A128KW             = KeyAlgorithm("A128KW")             // AES key wrap (128)
+	A192KW             = KeyAlgorithm("A192KW")             // AES key wrap (192)
+	A256KW             = KeyAlgorithm("A256KW")             // AES key wrap (256)
+	DIRECT             = KeyAlgorithm("dir")                // Direct encryption
+	ECDH_ES            = KeyAlgorithm("ECDH-ES")            // ECDH-ES
+	ECDH_ES_A128KW     = KeyAlgorithm("ECDH-ES+A128KW")     // ECDH-ES + AES key wrap (128)
+	ECDH_ES_A192KW     = KeyAlgorithm("ECDH-ES+A192KW")     // ECDH-ES + AES key wrap (192)
+	ECDH_ES_A256KW     = KeyAlgorithm("ECDH-ES+A256KW")     // ECDH-ES + AES key wrap (256)
+	A128GCMKW          = KeyAlgorithm("A128GCMKW")          // AES-GCM key wrap (128)
+	A192GCMKW          = KeyAlgorithm("A192GCMKW")          // AES-GCM key wrap (192)
+	A256GCMKW          = KeyAlgorithm("A256GCMKW")          // AES-GCM key wrap (256)
+	PBES2_HS256_A128KW = KeyAlgorithm("PBES2-HS256+A128KW") // PBES2 + HMAC-SHA256 + AES key wrap (128)
+	PBES2_HS384_A192KW = KeyAlgorithm("PBES2-HS384+A192KW") // PBES2 + HMAC-SHA384 + AES key wrap (192)
+	PBES2_HS512_A256KW = KeyAlgorithm("PBES2-HS512+A256KW") // PBES2 + HMAC-SHA512 + AES key wrap (256)
+)
+
+// Signature algorithms
+const (
+	EdDSA = SignatureAlgorithm("EdDSA")
+	HS256 = SignatureAlgorithm("HS256") // HMAC using SHA-256
+	HS384 = SignatureAlgorithm("HS384") // HMAC using SHA-384
+	HS512 = SignatureAlgorithm("HS512") // HMAC using SHA-512
+	RS256 = SignatureAlgorithm("RS256") // RSASSA-PKCS-v1.5 using SHA-256
+	RS384 = SignatureAlgorithm("RS384") // RSASSA-PKCS-v1.5 using SHA-384
+	RS512 = SignatureAlgorithm("RS512") // RSASSA-PKCS-v1.5 using SHA-512
+	ES256 = SignatureAlgorithm("ES256") // ECDSA using P-256 and SHA-256
+	ES384 = SignatureAlgorithm("ES384") // ECDSA using P-384 and SHA-384
+	ES512 = SignatureAlgorithm("ES512") // ECDSA using P-521 and SHA-512
+	PS256 = SignatureAlgorithm("PS256") // RSASSA-PSS using SHA256 and MGF1-SHA256
+	PS384 = SignatureAlgorithm("PS384") // RSASSA-PSS using SHA384 and MGF1-SHA384
+	PS512 = SignatureAlgorithm("PS512") // RSASSA-PSS using SHA512 and MGF1-SHA512
+)
+
+// Content encryption algorithms
+const (
+	A128CBC_HS256 = ContentEncryption("A128CBC-HS256") // AES-CBC + HMAC-SHA256 (128)
+	A192CBC_HS384 = ContentEncryption("A192CBC-HS384") // AES-CBC + HMAC-SHA384 (192)
+	A256CBC_HS512 = ContentEncryption("A256CBC-HS512") // AES-CBC + HMAC-SHA512 (256)
+	A128GCM       = ContentEncryption("A128GCM")       // AES-GCM (128)
+	A192GCM       = ContentEncryption("A192GCM")       // AES-GCM (192)
+	A256GCM       = ContentEncryption("A256GCM")       // AES-GCM (256)
+)
+
+// Compression algorithms
+const (
+	NONE    = CompressionAlgorithm("")    // No compression
+	DEFLATE = CompressionAlgorithm("DEF") // DEFLATE (RFC 1951)
+)
+
+// A key in the protected header of a JWS object. Use of the Header...
+// constants is preferred to enhance type safety.
+type HeaderKey string
+
+const (
+	HeaderType        = "typ" // string
+	HeaderContentType = "cty" // string
+
+	// These are set by go-jose and shouldn't need to be set by consumers of the
+	// library.
+	headerAlgorithm   = "alg"  // string
+	headerEncryption  = "enc"  // ContentEncryption
+	headerCompression = "zip"  // CompressionAlgorithm
+	headerCritical    = "crit" // []string
+
+	headerAPU = "apu" // *byteBuffer
+	headerAPV = "apv" // *byteBuffer
+	headerEPK = "epk" // *JSONWebKey
+	headerIV  = "iv"  // *byteBuffer
+	headerTag = "tag" // *byteBuffer
+	headerX5c = "x5c" // []*x509.Certificate
+
+	headerJWK   = "jwk"   // *JSONWebKey
+	headerKeyID = "kid"   // string
+	headerNonce = "nonce" // string
+	headerB64   = "b64"   // bool
+
+	headerP2C = "p2c" // *byteBuffer (int)
+	headerP2S = "p2s" // *byteBuffer ([]byte)
+
+)
+
+// supportedCritical is the set of supported extensions that are understood and processed.
+var supportedCritical = map[string]bool{
+	headerB64: true,
+}
+
+// rawHeader represents the JOSE header for JWE/JWS objects (used for parsing).
+//
+// The decoding of the constituent items is deferred because we want to marshal
+// some members into particular structs rather than generic maps, but at the
+// same time we need to receive any extra fields unhandled by this library to
+// pass through to consuming code in case it wants to examine them.
+type rawHeader map[HeaderKey]*json.RawMessage
+
+// Header represents the read-only JOSE header for JWE/JWS objects.
+type Header struct {
+	KeyID      string
+	JSONWebKey *JSONWebKey
+	Algorithm  string
+	Nonce      string
+
+	// Unverified certificate chain parsed from x5c header.
+	certificates []*x509.Certificate
+
+	// Any headers not recognised above get unmarshalled
+	// from JSON in a generic manner and placed in this map.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// Certificates verifies & returns the certificate chain present
+// in the x5c header field of a message, if one was present. Returns
+// an error if there was no x5c header present or the chain could
+// not be validated with the given verify options.
+func (h Header) Certificates(opts x509.VerifyOptions) ([][]*x509.Certificate, error) {
+	if len(h.certificates) == 0 {
+		return nil, errors.New("go-jose/go-jose: no x5c header present in message")
+	}
+
+	leaf := h.certificates[0]
+	if opts.Intermediates == nil {
+		opts.Intermediates = x509.NewCertPool()
+		for _, intermediate := range h.certificates[1:] {
+			opts.Intermediates.AddCert(intermediate)
+		}
+	}
+
+	return leaf.Verify(opts)
+}
+
+func (parsed rawHeader) set(k HeaderKey, v interface{}) error {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+
+	parsed[k] = makeRawMessage(b)
+	return nil
+}
+
+// getString gets a string from the raw JSON, defaulting to "".
+func (parsed rawHeader) getString(k HeaderKey) string {
+	v, ok := parsed[k]
+	if !ok || v == nil {
+		return ""
+	}
+	var s string
+	err := json.Unmarshal(*v, &s)
+	if err != nil {
+		return ""
+	}
+	return s
+}
+
+// getByteBuffer gets a byte buffer from the raw JSON. Returns (nil, nil) if
+// not specified.
+func (parsed rawHeader) getByteBuffer(k HeaderKey) (*byteBuffer, error) {
+	v := parsed[k]
+	if v == nil {
+		return nil, nil
+	}
+	var bb *byteBuffer
+	err := json.Unmarshal(*v, &bb)
+	if err != nil {
+		return nil, err
+	}
+	return bb, nil
+}
+
+// getAlgorithm extracts parsed "alg" from the raw JSON as a KeyAlgorithm.
+func (parsed rawHeader) getAlgorithm() KeyAlgorithm {
+	return KeyAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getSignatureAlgorithm extracts parsed "alg" from the raw JSON as a SignatureAlgorithm.
+func (parsed rawHeader) getSignatureAlgorithm() SignatureAlgorithm {
+	return SignatureAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getEncryption extracts parsed "enc" from the raw JSON.
+func (parsed rawHeader) getEncryption() ContentEncryption {
+	return ContentEncryption(parsed.getString(headerEncryption))
+}
+
+// getCompression extracts parsed "zip" from the raw JSON.
+func (parsed rawHeader) getCompression() CompressionAlgorithm {
+	return CompressionAlgorithm(parsed.getString(headerCompression))
+}
+
+func (parsed rawHeader) getNonce() string {
+	return parsed.getString(headerNonce)
+}
+
+// getEPK extracts parsed "epk" from the raw JSON.
+func (parsed rawHeader) getEPK() (*JSONWebKey, error) {
+	v := parsed[headerEPK]
+	if v == nil {
+		return nil, nil
+	}
+	var epk *JSONWebKey
+	err := json.Unmarshal(*v, &epk)
+	if err != nil {
+		return nil, err
+	}
+	return epk, nil
+}
+
+// getAPU extracts parsed "apu" from the raw JSON.
+func (parsed rawHeader) getAPU() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPU)
+}
+
+// getAPV extracts parsed "apv" from the raw JSON.
+func (parsed rawHeader) getAPV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPV)
+}
+
+// getIV extracts parsed "iv" from the raw JSON.
+func (parsed rawHeader) getIV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerIV)
+}
+
+// getTag extracts parsed "tag" from the raw JSON.
+func (parsed rawHeader) getTag() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerTag)
+}
+
+// getJWK extracts parsed "jwk" from the raw JSON.
+func (parsed rawHeader) getJWK() (*JSONWebKey, error) {
+	v := parsed[headerJWK]
+	if v == nil {
+		return nil, nil
+	}
+	var jwk *JSONWebKey
+	err := json.Unmarshal(*v, &jwk)
+	if err != nil {
+		return nil, err
+	}
+	return jwk, nil
+}
+
+// getCritical extracts parsed "crit" from the raw JSON. If omitted, it
+// returns an empty slice.
+func (parsed rawHeader) getCritical() ([]string, error) {
+	v := parsed[headerCritical]
+	if v == nil {
+		return nil, nil
+	}
+
+	var q []string
+	err := json.Unmarshal(*v, &q)
+	if err != nil {
+		return nil, err
+	}
+	return q, nil
+}
+
+// getS2C extracts parsed "p2c" from the raw JSON.
+func (parsed rawHeader) getP2C() (int, error) {
+	v := parsed[headerP2C]
+	if v == nil {
+		return 0, nil
+	}
+
+	var p2c int
+	err := json.Unmarshal(*v, &p2c)
+	if err != nil {
+		return 0, err
+	}
+	return p2c, nil
+}
+
+// getS2S extracts parsed "p2s" from the raw JSON.
+func (parsed rawHeader) getP2S() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerP2S)
+}
+
+// getB64 extracts parsed "b64" from the raw JSON, defaulting to true.
+func (parsed rawHeader) getB64() (bool, error) {
+	v := parsed[headerB64]
+	if v == nil {
+		return true, nil
+	}
+
+	var b64 bool
+	err := json.Unmarshal(*v, &b64)
+	if err != nil {
+		return true, err
+	}
+	return b64, nil
+}
+
+// sanitized produces a cleaned-up header object from the raw JSON.
+func (parsed rawHeader) sanitized() (h Header, err error) {
+	for k, v := range parsed {
+		if v == nil {
+			continue
+		}
+		switch k {
+		case headerJWK:
+			var jwk *JSONWebKey
+			err = json.Unmarshal(*v, &jwk)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal JWK: %v: %#v", err, string(*v))
+				return
+			}
+			h.JSONWebKey = jwk
+		case headerKeyID:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal key ID: %v: %#v", err, string(*v))
+				return
+			}
+			h.KeyID = s
+		case headerAlgorithm:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal algorithm: %v: %#v", err, string(*v))
+				return
+			}
+			h.Algorithm = s
+		case headerNonce:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal nonce: %v: %#v", err, string(*v))
+				return
+			}
+			h.Nonce = s
+		case headerX5c:
+			c := []string{}
+			err = json.Unmarshal(*v, &c)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
+				return
+			}
+			h.certificates, err = parseCertificateChain(c)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
+				return
+			}
+		default:
+			if h.ExtraHeaders == nil {
+				h.ExtraHeaders = map[HeaderKey]interface{}{}
+			}
+			var v2 interface{}
+			err = json.Unmarshal(*v, &v2)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal value: %v: %#v", err, string(*v))
+				return
+			}
+			h.ExtraHeaders[k] = v2
+		}
+	}
+	return
+}
+
+func parseCertificateChain(chain []string) ([]*x509.Certificate, error) {
+	out := make([]*x509.Certificate, len(chain))
+	for i, cert := range chain {
+		raw, err := base64.StdEncoding.DecodeString(cert)
+		if err != nil {
+			return nil, err
+		}
+		out[i], err = x509.ParseCertificate(raw)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return out, nil
+}
+
+func (parsed rawHeader) isSet(k HeaderKey) bool {
+	dvr := parsed[k]
+	if dvr == nil {
+		return false
+	}
+
+	var dv interface{}
+	err := json.Unmarshal(*dvr, &dv)
+	if err != nil {
+		return true
+	}
+
+	if dvStr, ok := dv.(string); ok {
+		return dvStr != ""
+	}
+
+	return true
+}
+
+// Merge headers from src into dst, giving precedence to headers from l.
+func (parsed rawHeader) merge(src *rawHeader) {
+	if src == nil {
+		return
+	}
+
+	for k, v := range *src {
+		if parsed.isSet(k) {
+			continue
+		}
+
+		parsed[k] = v
+	}
+}
+
+// Get JOSE name of curve
+func curveName(crv elliptic.Curve) (string, error) {
+	switch crv {
+	case elliptic.P256():
+		return "P-256", nil
+	case elliptic.P384():
+		return "P-384", nil
+	case elliptic.P521():
+		return "P-521", nil
+	default:
+		return "", fmt.Errorf("go-jose/go-jose: unsupported/unknown elliptic curve")
+	}
+}
+
+// Get size of curve in bytes
+func curveSize(crv elliptic.Curve) int {
+	bits := crv.Params().BitSize
+
+	div := bits / 8
+	mod := bits % 8
+
+	if mod == 0 {
+		return div
+	}
+
+	return div + 1
+}
+
+func makeRawMessage(b []byte) *json.RawMessage {
+	rm := json.RawMessage(b)
+	return &rm
+}

vendor/github.com/go-jose/go-jose/v3/signing.go

@@ -0,0 +1,450 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/rsa"
+	"encoding/base64"
+	"errors"
+	"fmt"
+
+	"github.com/go-jose/go-jose/v3/json"
+)
+
+// NonceSource represents a source of random nonces to go into JWS objects
+type NonceSource interface {
+	Nonce() (string, error)
+}
+
+// Signer represents a signer which takes a payload and produces a signed JWS object.
+type Signer interface {
+	Sign(payload []byte) (*JSONWebSignature, error)
+	Options() SignerOptions
+}
+
+// SigningKey represents an algorithm/key used to sign a message.
+type SigningKey struct {
+	Algorithm SignatureAlgorithm
+	Key       interface{}
+}
+
+// SignerOptions represents options that can be set when creating signers.
+type SignerOptions struct {
+	NonceSource NonceSource
+	EmbedJWK    bool
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (so *SignerOptions) WithHeader(k HeaderKey, v interface{}) *SignerOptions {
+	if so.ExtraHeaders == nil {
+		so.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	so.ExtraHeaders[k] = v
+	return so
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// SignerOptions.
+func (so *SignerOptions) WithContentType(contentType ContentType) *SignerOptions {
+	return so.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated SignerOptions.
+func (so *SignerOptions) WithType(typ ContentType) *SignerOptions {
+	return so.WithHeader(HeaderType, typ)
+}
+
+// WithCritical adds the given names to the critical ("crit") header and returns
+// the updated SignerOptions.
+func (so *SignerOptions) WithCritical(names ...string) *SignerOptions {
+	if so.ExtraHeaders[headerCritical] == nil {
+		so.WithHeader(headerCritical, make([]string, 0, len(names)))
+	}
+	crit := so.ExtraHeaders[headerCritical].([]string)
+	so.ExtraHeaders[headerCritical] = append(crit, names...)
+	return so
+}
+
+// WithBase64 adds a base64url-encode payload ("b64") header and returns the updated
+// SignerOptions. When the "b64" value is "false", the payload is not base64 encoded.
+func (so *SignerOptions) WithBase64(b64 bool) *SignerOptions {
+	if !b64 {
+		so.WithHeader(headerB64, b64)
+		so.WithCritical(headerB64)
+	}
+	return so
+}
+
+type payloadSigner interface {
+	signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error)
+}
+
+type payloadVerifier interface {
+	verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error
+}
+
+type genericSigner struct {
+	recipients   []recipientSigInfo
+	nonceSource  NonceSource
+	embedJWK     bool
+	extraHeaders map[HeaderKey]interface{}
+}
+
+type recipientSigInfo struct {
+	sigAlg    SignatureAlgorithm
+	publicKey func() *JSONWebKey
+	signer    payloadSigner
+}
+
+func staticPublicKey(jwk *JSONWebKey) func() *JSONWebKey {
+	return func() *JSONWebKey {
+		return jwk
+	}
+}
+
+// NewSigner creates an appropriate signer based on the key type
+func NewSigner(sig SigningKey, opts *SignerOptions) (Signer, error) {
+	return NewMultiSigner([]SigningKey{sig}, opts)
+}
+
+// NewMultiSigner creates a signer for multiple recipients
+func NewMultiSigner(sigs []SigningKey, opts *SignerOptions) (Signer, error) {
+	signer := &genericSigner{recipients: []recipientSigInfo{}}
+
+	if opts != nil {
+		signer.nonceSource = opts.NonceSource
+		signer.embedJWK = opts.EmbedJWK
+		signer.extraHeaders = opts.ExtraHeaders
+	}
+
+	for _, sig := range sigs {
+		err := signer.addRecipient(sig.Algorithm, sig.Key)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return signer, nil
+}
+
+// newVerifier creates a verifier based on the key type
+func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
+	switch verificationKey := verificationKey.(type) {
+	case ed25519.PublicKey:
+		return &edEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
+	case *rsa.PublicKey:
+		return &rsaEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
+	case *ecdsa.PublicKey:
+		return &ecEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
+	case []byte:
+		return &symmetricMac{
+			key: verificationKey,
+		}, nil
+	case JSONWebKey:
+		return newVerifier(verificationKey.Key)
+	case *JSONWebKey:
+		return newVerifier(verificationKey.Key)
+	}
+	if ov, ok := verificationKey.(OpaqueVerifier); ok {
+		return &opaqueVerifier{verifier: ov}, nil
+	}
+	return nil, ErrUnsupportedKeyType
+}
+
+func (ctx *genericSigner) addRecipient(alg SignatureAlgorithm, signingKey interface{}) error {
+	recipient, err := makeJWSRecipient(alg, signingKey)
+	if err != nil {
+		return err
+	}
+
+	ctx.recipients = append(ctx.recipients, recipient)
+	return nil
+}
+
+func makeJWSRecipient(alg SignatureAlgorithm, signingKey interface{}) (recipientSigInfo, error) {
+	switch signingKey := signingKey.(type) {
+	case ed25519.PrivateKey:
+		return newEd25519Signer(alg, signingKey)
+	case *rsa.PrivateKey:
+		return newRSASigner(alg, signingKey)
+	case *ecdsa.PrivateKey:
+		return newECDSASigner(alg, signingKey)
+	case []byte:
+		return newSymmetricSigner(alg, signingKey)
+	case JSONWebKey:
+		return newJWKSigner(alg, signingKey)
+	case *JSONWebKey:
+		return newJWKSigner(alg, *signingKey)
+	}
+	if signer, ok := signingKey.(OpaqueSigner); ok {
+		return newOpaqueSigner(alg, signer)
+	}
+	return recipientSigInfo{}, ErrUnsupportedKeyType
+}
+
+func newJWKSigner(alg SignatureAlgorithm, signingKey JSONWebKey) (recipientSigInfo, error) {
+	recipient, err := makeJWSRecipient(alg, signingKey.Key)
+	if err != nil {
+		return recipientSigInfo{}, err
+	}
+	if recipient.publicKey != nil && recipient.publicKey() != nil {
+		// recipient.publicKey is a JWK synthesized for embedding when recipientSigInfo
+		// was created for the inner key (such as a RSA or ECDSA public key). It contains
+		// the pub key for embedding, but doesn't have extra params like key id.
+		publicKey := signingKey
+		publicKey.Key = recipient.publicKey().Key
+		recipient.publicKey = staticPublicKey(&publicKey)
+
+		// This should be impossible, but let's check anyway.
+		if !recipient.publicKey().IsPublic() {
+			return recipientSigInfo{}, errors.New("go-jose/go-jose: public key was unexpectedly not public")
+		}
+	}
+	return recipient, nil
+}
+
+func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
+	obj := &JSONWebSignature{}
+	obj.payload = payload
+	obj.Signatures = make([]Signature, len(ctx.recipients))
+
+	for i, recipient := range ctx.recipients {
+		protected := map[HeaderKey]interface{}{
+			headerAlgorithm: string(recipient.sigAlg),
+		}
+
+		if recipient.publicKey != nil && recipient.publicKey() != nil {
+			// We want to embed the JWK or set the kid header, but not both. Having a protected
+			// header that contains an embedded JWK while also simultaneously containing the kid
+			// header is confusing, and at least in ACME the two are considered to be mutually
+			// exclusive. The fact that both can exist at the same time is a somewhat unfortunate
+			// result of the JOSE spec. We've decided that this library will only include one or
+			// the other to avoid this confusion.
+			//
+			// See https://github.com/go-jose/go-jose/issues/157 for more context.
+			if ctx.embedJWK {
+				protected[headerJWK] = recipient.publicKey()
+			} else {
+				keyID := recipient.publicKey().KeyID
+				if keyID != "" {
+					protected[headerKeyID] = keyID
+				}
+			}
+		}
+
+		if ctx.nonceSource != nil {
+			nonce, err := ctx.nonceSource.Nonce()
+			if err != nil {
+				return nil, fmt.Errorf("go-jose/go-jose: Error generating nonce: %v", err)
+			}
+			protected[headerNonce] = nonce
+		}
+
+		for k, v := range ctx.extraHeaders {
+			protected[k] = v
+		}
+
+		serializedProtected := mustSerializeJSON(protected)
+		needsBase64 := true
+
+		if b64, ok := protected[headerB64]; ok {
+			if needsBase64, ok = b64.(bool); !ok {
+				return nil, errors.New("go-jose/go-jose: Invalid b64 header parameter")
+			}
+		}
+
+		var input bytes.Buffer
+
+		input.WriteString(base64.RawURLEncoding.EncodeToString(serializedProtected))
+		input.WriteByte('.')
+
+		if needsBase64 {
+			input.WriteString(base64.RawURLEncoding.EncodeToString(payload))
+		} else {
+			input.Write(payload)
+		}
+
+		signatureInfo, err := recipient.signer.signPayload(input.Bytes(), recipient.sigAlg)
+		if err != nil {
+			return nil, err
+		}
+
+		signatureInfo.protected = &rawHeader{}
+		for k, v := range protected {
+			b, err := json.Marshal(v)
+			if err != nil {
+				return nil, fmt.Errorf("go-jose/go-jose: Error marshalling item %#v: %v", k, err)
+			}
+			(*signatureInfo.protected)[k] = makeRawMessage(b)
+		}
+		obj.Signatures[i] = signatureInfo
+	}
+
+	return obj, nil
+}
+
+func (ctx *genericSigner) Options() SignerOptions {
+	return SignerOptions{
+		NonceSource:  ctx.nonceSource,
+		EmbedJWK:     ctx.embedJWK,
+		ExtraHeaders: ctx.extraHeaders,
+	}
+}
+
+// Verify validates the signature on the object and returns the payload.
+// This function does not support multi-signature, if you desire multi-sig
+// verification use VerifyMulti instead.
+//
+// Be careful when verifying signatures based on embedded JWKs inside the
+// payload header. You cannot assume that the key received in a payload is
+// trusted.
+func (obj JSONWebSignature) Verify(verificationKey interface{}) ([]byte, error) {
+	err := obj.DetachedVerify(obj.payload, verificationKey)
+	if err != nil {
+		return nil, err
+	}
+	return obj.payload, nil
+}
+
+// UnsafePayloadWithoutVerification returns the payload without
+// verifying it. The content returned from this function cannot be
+// trusted.
+func (obj JSONWebSignature) UnsafePayloadWithoutVerification() []byte {
+	return obj.payload
+}
+
+// DetachedVerify validates a detached signature on the given payload. In
+// most cases, you will probably want to use Verify instead. DetachedVerify
+// is only useful if you have a payload and signature that are separated from
+// each other.
+func (obj JSONWebSignature) DetachedVerify(payload []byte, verificationKey interface{}) error {
+	key := tryJWKS(verificationKey, obj.headers()...)
+	verifier, err := newVerifier(key)
+	if err != nil {
+		return err
+	}
+
+	if len(obj.Signatures) > 1 {
+		return errors.New("go-jose/go-jose: too many signatures in payload; expecting only one")
+	}
+
+	signature := obj.Signatures[0]
+	headers := signature.mergedHeaders()
+	critical, err := headers.getCritical()
+	if err != nil {
+		return err
+	}
+
+	for _, name := range critical {
+		if !supportedCritical[name] {
+			return ErrCryptoFailure
+		}
+	}
+
+	input, err := obj.computeAuthData(payload, &signature)
+	if err != nil {
+		return ErrCryptoFailure
+	}
+
+	alg := headers.getSignatureAlgorithm()
+	err = verifier.verifyPayload(input, signature.Signature, alg)
+	if err == nil {
+		return nil
+	}
+
+	return ErrCryptoFailure
+}
+
+// VerifyMulti validates (one of the multiple) signatures on the object and
+// returns the index of the signature that was verified, along with the signature
+// object and the payload. We return the signature and index to guarantee that
+// callers are getting the verified value.
+func (obj JSONWebSignature) VerifyMulti(verificationKey interface{}) (int, Signature, []byte, error) {
+	idx, sig, err := obj.DetachedVerifyMulti(obj.payload, verificationKey)
+	if err != nil {
+		return -1, Signature{}, nil, err
+	}
+	return idx, sig, obj.payload, nil
+}
+
+// DetachedVerifyMulti validates a detached signature on the given payload with
+// a signature/object that has potentially multiple signers. This returns the index
+// of the signature that was verified, along with the signature object. We return
+// the signature and index to guarantee that callers are getting the verified value.
+//
+// In most cases, you will probably want to use Verify or VerifyMulti instead.
+// DetachedVerifyMulti is only useful if you have a payload and signature that are
+// separated from each other, and the signature can have multiple signers at the
+// same time.
+func (obj JSONWebSignature) DetachedVerifyMulti(payload []byte, verificationKey interface{}) (int, Signature, error) {
+	key := tryJWKS(verificationKey, obj.headers()...)
+	verifier, err := newVerifier(key)
+	if err != nil {
+		return -1, Signature{}, err
+	}
+
+outer:
+	for i, signature := range obj.Signatures {
+		headers := signature.mergedHeaders()
+		critical, err := headers.getCritical()
+		if err != nil {
+			continue
+		}
+
+		for _, name := range critical {
+			if !supportedCritical[name] {
+				continue outer
+			}
+		}
+
+		input, err := obj.computeAuthData(payload, &signature)
+		if err != nil {
+			continue
+		}
+
+		alg := headers.getSignatureAlgorithm()
+		err = verifier.verifyPayload(input, signature.Signature, alg)
+		if err == nil {
+			return i, signature, nil
+		}
+	}
+
+	return -1, Signature{}, ErrCryptoFailure
+}
+
+func (obj JSONWebSignature) headers() []Header {
+	headers := make([]Header, len(obj.Signatures))
+	for i, sig := range obj.Signatures {
+		headers[i] = sig.Header
+	}
+	return headers
+}

vendor/github.com/go-jose/go-jose/v3/symmetric.go

@@ -0,0 +1,495 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/sha512"
+	"crypto/subtle"
+	"errors"
+	"fmt"
+	"hash"
+	"io"
+
+	"golang.org/x/crypto/pbkdf2"
+
+	josecipher "github.com/go-jose/go-jose/v3/cipher"
+)
+
+// RandReader is a cryptographically secure random number generator (stubbed out in tests).
+var RandReader = rand.Reader
+
+const (
+	// RFC7518 recommends a minimum of 1,000 iterations:
+	// https://tools.ietf.org/html/rfc7518#section-4.8.1.2
+	// NIST recommends a minimum of 10,000:
+	// https://pages.nist.gov/800-63-3/sp800-63b.html
+	// 1Password uses 100,000:
+	// https://support.1password.com/pbkdf2/
+	defaultP2C = 100000
+	// Default salt size: 128 bits
+	defaultP2SSize = 16
+)
+
+// Dummy key cipher for shared symmetric key mode
+type symmetricKeyCipher struct {
+	key []byte // Pre-shared content-encryption key
+	p2c int    // PBES2 Count
+	p2s []byte // PBES2 Salt Input
+}
+
+// Signer/verifier for MAC modes
+type symmetricMac struct {
+	key []byte
+}
+
+// Input/output from an AEAD operation
+type aeadParts struct {
+	iv, ciphertext, tag []byte
+}
+
+// A content cipher based on an AEAD construction
+type aeadContentCipher struct {
+	keyBytes     int
+	authtagBytes int
+	getAead      func(key []byte) (cipher.AEAD, error)
+}
+
+// Random key generator
+type randomKeyGenerator struct {
+	size int
+}
+
+// Static key generator
+type staticKeyGenerator struct {
+	key []byte
+}
+
+// Create a new content cipher based on AES-GCM
+func newAESGCM(keySize int) contentCipher {
+	return &aeadContentCipher{
+		keyBytes:     keySize,
+		authtagBytes: 16,
+		getAead: func(key []byte) (cipher.AEAD, error) {
+			aes, err := aes.NewCipher(key)
+			if err != nil {
+				return nil, err
+			}
+
+			return cipher.NewGCM(aes)
+		},
+	}
+}
+
+// Create a new content cipher based on AES-CBC+HMAC
+func newAESCBC(keySize int) contentCipher {
+	return &aeadContentCipher{
+		keyBytes:     keySize * 2,
+		authtagBytes: keySize,
+		getAead: func(key []byte) (cipher.AEAD, error) {
+			return josecipher.NewCBCHMAC(key, aes.NewCipher)
+		},
+	}
+}
+
+// Get an AEAD cipher object for the given content encryption algorithm
+func getContentCipher(alg ContentEncryption) contentCipher {
+	switch alg {
+	case A128GCM:
+		return newAESGCM(16)
+	case A192GCM:
+		return newAESGCM(24)
+	case A256GCM:
+		return newAESGCM(32)
+	case A128CBC_HS256:
+		return newAESCBC(16)
+	case A192CBC_HS384:
+		return newAESCBC(24)
+	case A256CBC_HS512:
+		return newAESCBC(32)
+	default:
+		return nil
+	}
+}
+
+// getPbkdf2Params returns the key length and hash function used in
+// pbkdf2.Key.
+func getPbkdf2Params(alg KeyAlgorithm) (int, func() hash.Hash) {
+	switch alg {
+	case PBES2_HS256_A128KW:
+		return 16, sha256.New
+	case PBES2_HS384_A192KW:
+		return 24, sha512.New384
+	case PBES2_HS512_A256KW:
+		return 32, sha512.New
+	default:
+		panic("invalid algorithm")
+	}
+}
+
+// getRandomSalt generates a new salt of the given size.
+func getRandomSalt(size int) ([]byte, error) {
+	salt := make([]byte, size)
+	_, err := io.ReadFull(RandReader, salt)
+	if err != nil {
+		return nil, err
+	}
+
+	return salt, nil
+}
+
+// newSymmetricRecipient creates a JWE encrypter based on AES-GCM key wrap.
+func newSymmetricRecipient(keyAlg KeyAlgorithm, key []byte) (recipientKeyInfo, error) {
+	switch keyAlg {
+	case DIRECT, A128GCMKW, A192GCMKW, A256GCMKW, A128KW, A192KW, A256KW:
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &symmetricKeyCipher{
+			key: key,
+		},
+	}, nil
+}
+
+// newSymmetricSigner creates a recipientSigInfo based on the given key.
+func newSymmetricSigner(sigAlg SignatureAlgorithm, key []byte) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case HS256, HS384, HS512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		signer: &symmetricMac{
+			key: key,
+		},
+	}, nil
+}
+
+// Generate a random key for the given content cipher
+func (ctx randomKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	key := make([]byte, ctx.size)
+	_, err := io.ReadFull(RandReader, key)
+	if err != nil {
+		return nil, rawHeader{}, err
+	}
+
+	return key, rawHeader{}, nil
+}
+
+// Key size for random generator
+func (ctx randomKeyGenerator) keySize() int {
+	return ctx.size
+}
+
+// Generate a static key (for direct mode)
+func (ctx staticKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	cek := make([]byte, len(ctx.key))
+	copy(cek, ctx.key)
+	return cek, rawHeader{}, nil
+}
+
+// Key size for static generator
+func (ctx staticKeyGenerator) keySize() int {
+	return len(ctx.key)
+}
+
+// Get key size for this cipher
+func (ctx aeadContentCipher) keySize() int {
+	return ctx.keyBytes
+}
+
+// Encrypt some data
+func (ctx aeadContentCipher) encrypt(key, aad, pt []byte) (*aeadParts, error) {
+	// Get a new AEAD instance
+	aead, err := ctx.getAead(key)
+	if err != nil {
+		return nil, err
+	}
+
+	// Initialize a new nonce
+	iv := make([]byte, aead.NonceSize())
+	_, err = io.ReadFull(RandReader, iv)
+	if err != nil {
+		return nil, err
+	}
+
+	ciphertextAndTag := aead.Seal(nil, iv, pt, aad)
+	offset := len(ciphertextAndTag) - ctx.authtagBytes
+
+	return &aeadParts{
+		iv:         iv,
+		ciphertext: ciphertextAndTag[:offset],
+		tag:        ciphertextAndTag[offset:],
+	}, nil
+}
+
+// Decrypt some data
+func (ctx aeadContentCipher) decrypt(key, aad []byte, parts *aeadParts) ([]byte, error) {
+	aead, err := ctx.getAead(key)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(parts.iv) != aead.NonceSize() || len(parts.tag) < ctx.authtagBytes {
+		return nil, ErrCryptoFailure
+	}
+
+	return aead.Open(nil, parts.iv, append(parts.ciphertext, parts.tag...), aad)
+}
+
+// Encrypt the content encryption key.
+func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	switch alg {
+	case DIRECT:
+		return recipientInfo{
+			header: &rawHeader{},
+		}, nil
+	case A128GCMKW, A192GCMKW, A256GCMKW:
+		aead := newAESGCM(len(ctx.key))
+
+		parts, err := aead.encrypt(ctx.key, []byte{}, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		header := &rawHeader{}
+
+		if err = header.set(headerIV, newBuffer(parts.iv)); err != nil {
+			return recipientInfo{}, err
+		}
+
+		if err = header.set(headerTag, newBuffer(parts.tag)); err != nil {
+			return recipientInfo{}, err
+		}
+
+		return recipientInfo{
+			header:       header,
+			encryptedKey: parts.ciphertext,
+		}, nil
+	case A128KW, A192KW, A256KW:
+		block, err := aes.NewCipher(ctx.key)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		jek, err := josecipher.KeyWrap(block, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		return recipientInfo{
+			encryptedKey: jek,
+			header:       &rawHeader{},
+		}, nil
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		if len(ctx.p2s) == 0 {
+			salt, err := getRandomSalt(defaultP2SSize)
+			if err != nil {
+				return recipientInfo{}, err
+			}
+			ctx.p2s = salt
+		}
+
+		if ctx.p2c <= 0 {
+			ctx.p2c = defaultP2C
+		}
+
+		// salt is UTF8(Alg) || 0x00 || Salt Input
+		salt := bytes.Join([][]byte{[]byte(alg), ctx.p2s}, []byte{0x00})
+
+		// derive key
+		keyLen, h := getPbkdf2Params(alg)
+		key := pbkdf2.Key(ctx.key, salt, ctx.p2c, keyLen, h)
+
+		// use AES cipher with derived key
+		block, err := aes.NewCipher(key)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		jek, err := josecipher.KeyWrap(block, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		header := &rawHeader{}
+
+		if err = header.set(headerP2C, ctx.p2c); err != nil {
+			return recipientInfo{}, err
+		}
+
+		if err = header.set(headerP2S, newBuffer(ctx.p2s)); err != nil {
+			return recipientInfo{}, err
+		}
+
+		return recipientInfo{
+			encryptedKey: jek,
+			header:       header,
+		}, nil
+	}
+
+	return recipientInfo{}, ErrUnsupportedAlgorithm
+}
+
+// Decrypt the content encryption key.
+func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	switch headers.getAlgorithm() {
+	case DIRECT:
+		cek := make([]byte, len(ctx.key))
+		copy(cek, ctx.key)
+		return cek, nil
+	case A128GCMKW, A192GCMKW, A256GCMKW:
+		aead := newAESGCM(len(ctx.key))
+
+		iv, err := headers.getIV()
+		if err != nil {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid IV: %v", err)
+		}
+		tag, err := headers.getTag()
+		if err != nil {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid tag: %v", err)
+		}
+
+		parts := &aeadParts{
+			iv:         iv.bytes(),
+			ciphertext: recipient.encryptedKey,
+			tag:        tag.bytes(),
+		}
+
+		cek, err := aead.decrypt(ctx.key, []byte{}, parts)
+		if err != nil {
+			return nil, err
+		}
+
+		return cek, nil
+	case A128KW, A192KW, A256KW:
+		block, err := aes.NewCipher(ctx.key)
+		if err != nil {
+			return nil, err
+		}
+
+		cek, err := josecipher.KeyUnwrap(block, recipient.encryptedKey)
+		if err != nil {
+			return nil, err
+		}
+		return cek, nil
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		p2s, err := headers.getP2S()
+		if err != nil {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid P2S: %v", err)
+		}
+		if p2s == nil || len(p2s.data) == 0 {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid P2S: must be present")
+		}
+
+		p2c, err := headers.getP2C()
+		if err != nil {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid P2C: %v", err)
+		}
+		if p2c <= 0 {
+			return nil, fmt.Errorf("go-jose/go-jose: invalid P2C: must be a positive integer")
+		}
+
+		// salt is UTF8(Alg) || 0x00 || Salt Input
+		alg := headers.getAlgorithm()
+		salt := bytes.Join([][]byte{[]byte(alg), p2s.bytes()}, []byte{0x00})
+
+		// derive key
+		keyLen, h := getPbkdf2Params(alg)
+		key := pbkdf2.Key(ctx.key, salt, p2c, keyLen, h)
+
+		// use AES cipher with derived key
+		block, err := aes.NewCipher(key)
+		if err != nil {
+			return nil, err
+		}
+
+		cek, err := josecipher.KeyUnwrap(block, recipient.encryptedKey)
+		if err != nil {
+			return nil, err
+		}
+		return cek, nil
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Sign the given payload
+func (ctx symmetricMac) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	mac, err := ctx.hmac(payload, alg)
+	if err != nil {
+		return Signature{}, errors.New("go-jose/go-jose: failed to compute hmac")
+	}
+
+	return Signature{
+		Signature: mac,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx symmetricMac) verifyPayload(payload []byte, mac []byte, alg SignatureAlgorithm) error {
+	expected, err := ctx.hmac(payload, alg)
+	if err != nil {
+		return errors.New("go-jose/go-jose: failed to compute hmac")
+	}
+
+	if len(mac) != len(expected) {
+		return errors.New("go-jose/go-jose: invalid hmac")
+	}
+
+	match := subtle.ConstantTimeCompare(mac, expected)
+	if match != 1 {
+		return errors.New("go-jose/go-jose: invalid hmac")
+	}
+
+	return nil
+}
+
+// Compute the HMAC based on the given alg value
+func (ctx symmetricMac) hmac(payload []byte, alg SignatureAlgorithm) ([]byte, error) {
+	var hash func() hash.Hash
+
+	switch alg {
+	case HS256:
+		hash = sha256.New
+	case HS384:
+		hash = sha512.New384
+	case HS512:
+		hash = sha512.New
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	hmac := hmac.New(hash, ctx.key)
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hmac.Write(payload)
+	return hmac.Sum(nil), nil
+}

vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go

@@ -0,0 +1,77 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package pbkdf2 implements the key derivation function PBKDF2 as defined in RFC
+2898 / PKCS #5 v2.0.
+
+A key derivation function is useful when encrypting data based on a password
+or any other not-fully-random data. It uses a pseudorandom function to derive
+a secure encryption key based on the password.
+
+While v2.0 of the standard defines only one pseudorandom function to use,
+HMAC-SHA1, the drafted v2.1 specification allows use of all five FIPS Approved
+Hash Functions SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512 for HMAC. To
+choose, you can pass the `New` functions from the different SHA packages to
+pbkdf2.Key.
+*/
+package pbkdf2 // import "golang.org/x/crypto/pbkdf2"
+
+import (
+	"crypto/hmac"
+	"hash"
+)
+
+// Key derives a key from the password, salt and iteration count, returning a
+// []byte of length keylen that can be used as cryptographic key. The key is
+// derived based on the method described as PBKDF2 with the HMAC variant using
+// the supplied hash function.
+//
+// For example, to use a HMAC-SHA-1 based PBKDF2 key derivation function, you
+// can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
+// doing:
+//
+//	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
+//
+// Remember to get a good random salt. At least 8 bytes is recommended by the
+// RFC.
+//
+// Using a higher iteration count will increase the cost of an exhaustive
+// search but will also make derivation proportionally slower.
+func Key(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
+	prf := hmac.New(h, password)
+	hashLen := prf.Size()
+	numBlocks := (keyLen + hashLen - 1) / hashLen
+
+	var buf [4]byte
+	dk := make([]byte, 0, numBlocks*hashLen)
+	U := make([]byte, hashLen)
+	for block := 1; block <= numBlocks; block++ {
+		// N.B.: || means concatenation, ^ means XOR
+		// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
+		// U_1 = PRF(password, salt || uint(i))
+		prf.Reset()
+		prf.Write(salt)
+		buf[0] = byte(block >> 24)
+		buf[1] = byte(block >> 16)
+		buf[2] = byte(block >> 8)
+		buf[3] = byte(block)
+		prf.Write(buf[:4])
+		dk = prf.Sum(dk)
+		T := dk[len(dk)-hashLen:]
+		copy(U, T)
+
+		// U_n = PRF(password, U_(n-1))
+		for n := 2; n <= iter; n++ {
+			prf.Reset()
+			prf.Write(U)
+			U = U[:0]
+			U = prf.Sum(U)
+			for x := range U {
+				T[x] ^= U[x]
+			}
+		}
+	}
+	return dk[:keyLen]
+}

vendor/modules.txt

@@ -172,12 +172,15 @@ github.com/docker/go-events
 # github.com/docker/go-metrics v0.0.1
 ## explicit; go 1.11
 github.com/docker/go-metrics
-# github.com/docker/libtrust v0.0.0-20150114040149-fa567046d9b1
-## explicit
-github.com/docker/libtrust
 # github.com/felixge/httpsnoop v1.0.1
 ## explicit; go 1.13
 github.com/felixge/httpsnoop
+# github.com/go-jose/go-jose/v3 v3.0.0
+## explicit; go 1.12
+github.com/go-jose/go-jose/v3
+github.com/go-jose/go-jose/v3/cipher
+github.com/go-jose/go-jose/v3/json
+github.com/go-jose/go-jose/v3/jwt
 # github.com/go-logr/logr v1.2.4
 ## explicit; go 1.16
 github.com/go-logr/logr
@@ -363,6 +366,7 @@ golang.org/x/crypto/acme
 golang.org/x/crypto/acme/autocert
 golang.org/x/crypto/bcrypt
 golang.org/x/crypto/blowfish
+golang.org/x/crypto/pbkdf2
 golang.org/x/crypto/pkcs12
 golang.org/x/crypto/pkcs12/internal/rc2
 # golang.org/x/net v0.17.0