[#339] Add aws-sdk-go-v2

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/auth/center.go

@@ -9,29 +9,39 @@ import (
 	"io"
 	"mime/multipart"
 	"net/http"
+	"os"
 	"regexp"
 	"strings"
 	"time"
 
 	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
 	apierr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	v4a "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/tokens"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
 	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/smithy-go/logging"
 )
 
-// AuthorizationFieldRegexp -- is regexp for credentials with Base58 encoded cid and oid and '0' (zero) as delimiter.
+var (
-var AuthorizationFieldRegexp = regexp.MustCompile(`AWS4-HMAC-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
+	// AuthorizationFieldRegexp -- is regexp for credentials with Base58 encoded cid and oid and '0' (zero) as delimiter.
+	AuthorizationFieldRegexp = regexp.MustCompile(`AWS4-HMAC-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
 
-// postPolicyCredentialRegexp -- is regexp for credentials when uploading file using POST with policy.
+	// authorizationFieldV4aRegexp -- is regexp for credentials with Base58 encoded cid and oid and '0' (zero) as delimiter.
-var postPolicyCredentialRegexp = regexp.MustCompile(`(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request`)
+	authorizationFieldV4aRegexp = regexp.MustCompile(`AWS4-ECDSA-P256-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
+
+	// postPolicyCredentialRegexp -- is regexp for credentials when uploading file using POST with policy.
+	postPolicyCredentialRegexp = regexp.MustCompile(`(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request`)
+)
 
 type (
 	Center struct {
 		reg                        *RegexpSubmatcher
+		regV4a                     *RegexpSubmatcher
 		postReg                    *RegexpSubmatcher
 		cli                        tokens.Credentials
 		allowedAccessKeyIDPrefixes []string // empty slice means all access key ids are allowed
@@ -47,22 +57,26 @@ type (
 		AccessKeyID  string
 		Service      string
 		Region       string
-		SignatureV4  string
+		Signature    string
 		SignedFields []string
 		Date         string
 		IsPresigned  bool
 		Expiration   time.Duration
+		Preamble     string
+		PayloadHash  string
 	}
 )
 
 const (
-	authHeaderPartsNum = 6
+	authHeaderPartsNum    = 6
-	maxFormSizeMemory  = 50 * 1048576 // 50 MB
+	authHeaderV4aPartsNum = 5
+	maxFormSizeMemory     = 50 * 1048576 // 50 MB
 
 	AmzAlgorithm     = "X-Amz-Algorithm"
 	AmzCredential    = "X-Amz-Credential"
 	AmzSignature     = "X-Amz-Signature"
 	AmzSignedHeaders = "X-Amz-SignedHeaders"
+	AmzRegionSet     = "X-Amz-Region-Set"
 	AmzExpires       = "X-Amz-Expires"
 	AmzDate          = "X-Amz-Date"
 	AmzContentSHA256 = "X-Amz-Content-Sha256"
@@ -91,27 +105,56 @@ func New(creds tokens.Credentials, prefixes []string, settings CenterSettings) *
 	return &Center{
 		cli:                        creds,
 		reg:                        NewRegexpMatcher(AuthorizationFieldRegexp),
+		regV4a:                     NewRegexpMatcher(authorizationFieldV4aRegexp),
 		postReg:                    NewRegexpMatcher(postPolicyCredentialRegexp),
 		allowedAccessKeyIDPrefixes: prefixes,
 		settings:                   settings,
 	}
 }
 
-func (c *Center) parseAuthHeader(header string) (*AuthHeader, error) {
+const (
-	submatches := c.reg.GetSubmatches(header)
+	signaturePreambleSigV4  = "AWS4-HMAC-SHA256"
-	if len(submatches) != authHeaderPartsNum {
+	signaturePreambleSigV4A = "AWS4-ECDSA-P256-SHA256"
-		return nil, fmt.Errorf("%w: %s", apierr.GetAPIError(apierr.ErrAuthorizationHeaderMalformed), header)
+)
-	}
 
-	signedFields := strings.Split(submatches["signed_header_fields"], ";")
+func (c *Center) parseAuthHeader(authHeader string, headers http.Header) (*AuthHeader, error) {
+	preamble, _, _ := strings.Cut(authHeader, " ")
+
+	var (
+		submatches map[string]string
+		region     string
+	)
+
+	switch preamble {
+	case signaturePreambleSigV4:
+		submatches = c.reg.GetSubmatches(authHeader)
+		if len(submatches) != authHeaderPartsNum {
+			return nil, fmt.Errorf("%w: %s", apierr.GetAPIError(apierr.ErrAuthorizationHeaderMalformed), authHeader)
+		}
+		region = submatches["region"]
+	case signaturePreambleSigV4A:
+		submatches = c.regV4a.GetSubmatches(authHeader)
+		if len(submatches) != authHeaderV4aPartsNum {
+			return nil, fmt.Errorf("%w: %s", apierr.GetAPIError(apierr.ErrAuthorizationHeaderMalformed), authHeader)
+		}
+		region = headers.Get(AmzRegionSet)
+	default:
+		return nil, fmt.Errorf("%w: %s", apierr.GetAPIError(apierr.ErrAuthorizationHeaderMalformed), authHeader)
+	}
+	// AWS4-ECDSA-P256-SHA256
+	// Credential=2XGRML5EW3LMHdf64W2DkBy1Nkuu4y4wGhUj44QjbXBi05ZNvs8WVwy1XTmSEkcVkydPKzCgtmR7U3zyLYTj3Snxf/20240326/s3/aws4_request,
+	// SignedHeaders=amz-sdk-invocation-id;amz-sdk-request;host;x-amz-content-sha256;x-amz-date;x-amz-region-set,
+	// Signature=3044022006a2bc760140834101d0a79667d6aa75768c1a28e9cafc8963484d0752a6c6050220629dc06d7d6505e1b1e2a5d1f974b25ba32fdffc6f3f70dc4dda31b8a6f7ea2b
 
 	return &AuthHeader{
 		AccessKeyID:  submatches["access_key_id"],
 		Service:      submatches["service"],
-		Region:       submatches["region"],
+		Region:       region,
-		SignatureV4:  submatches["v4_signature"],
+		Signature:    submatches["v4_signature"],
-		SignedFields: signedFields,
+		SignedFields: strings.Split(submatches["signed_header_fields"], ";"),
 		Date:         submatches["date"],
+		Preamble:     preamble,
+		PayloadHash:  headers.Get(AmzContentSHA256),
 	}, nil
 }
 
@@ -129,7 +172,7 @@ func (c *Center) Authenticate(r *http.Request) (*middleware.Box, error) {
 	)
 
 	queryValues := r.URL.Query()
-	if queryValues.Get(AmzAlgorithm) == "AWS4-HMAC-SHA256" {
+	if queryValues.Get(AmzAlgorithm) == signaturePreambleSigV4 {
 		creds := strings.Split(queryValues.Get(AmzCredential), "/")
 		if len(creds) != 5 || creds[4] != "aws4_request" {
 			return nil, fmt.Errorf("bad X-Amz-Credential")
@@ -138,10 +181,31 @@ func (c *Center) Authenticate(r *http.Request) (*middleware.Box, error) {
 			AccessKeyID:  creds[0],
 			Service:      creds[3],
 			Region:       creds[2],
-			SignatureV4:  queryValues.Get(AmzSignature),
+			Signature:    queryValues.Get(AmzSignature),
 			SignedFields: strings.Split(queryValues.Get(AmzSignedHeaders), ";"),
 			Date:         creds[1],
 			IsPresigned:  true,
+			Preamble:     signaturePreambleSigV4,
+		}
+		authHdr.Expiration, err = time.ParseDuration(queryValues.Get(AmzExpires) + "s")
+		if err != nil {
+			return nil, fmt.Errorf("couldn't parse X-Amz-Expires: %w", err)
+		}
+		signatureDateTimeStr = queryValues.Get(AmzDate)
+	} else if queryValues.Get(AmzAlgorithm) == signaturePreambleSigV4A {
+		creds := strings.Split(queryValues.Get(AmzCredential), "/")
+		if len(creds) != 4 || creds[3] != "aws4_request" {
+			return nil, fmt.Errorf("bad X-Amz-Credential")
+		}
+		authHdr = &AuthHeader{
+			AccessKeyID:  creds[0],
+			Service:      creds[2],
+			Region:       queryValues.Get(AmzRegionSet),
+			Signature:    queryValues.Get(AmzSignature),
+			SignedFields: strings.Split(queryValues.Get(AmzSignedHeaders), ";"),
+			Date:         creds[1],
+			IsPresigned:  true,
+			Preamble:     signaturePreambleSigV4A,
 		}
 		authHdr.Expiration, err = time.ParseDuration(queryValues.Get(AmzExpires) + "s")
 		if err != nil {
@@ -156,7 +220,7 @@ func (c *Center) Authenticate(r *http.Request) (*middleware.Box, error) {
 			}
 			return nil, fmt.Errorf("%w: %v", middleware.ErrNoAuthorizationHeader, authHeaderField)
 		}
-		authHdr, err = c.parseAuthHeader(authHeaderField[0])
+		authHdr, err = c.parseAuthHeader(authHeaderField[0], r.Header)
 		if err != nil {
 			return nil, err
 		}
@@ -197,7 +261,7 @@ func (c *Center) Authenticate(r *http.Request) (*middleware.Box, error) {
 		AuthHeaders: &middleware.AuthHeader{
 			AccessKeyID: authHdr.AccessKeyID,
 			Region:      authHdr.Region,
-			SignatureV4: authHdr.SignatureV4,
+			SignatureV4: authHdr.Signature,
 		},
 		Attributes: attrs,
 	}
@@ -331,37 +395,75 @@ func cloneRequest(r *http.Request, authHeader *AuthHeader) *http.Request {
 }
 
 func (c *Center) checkSign(authHeader *AuthHeader, box *accessbox.Box, request *http.Request, signatureDateTime time.Time) error {
-	awsCreds := credentials.NewStaticCredentials(authHeader.AccessKeyID, box.Gate.SecretKey, "")
-	signer := v4.NewSigner(awsCreds)
-	signer.DisableURIPathEscaping = true
-
 	var signature string
-	if authHeader.IsPresigned {
+
-		now := time.Now()
+	switch authHeader.Preamble {
-		if signatureDateTime.Add(authHeader.Expiration).Before(now) {
+	case signaturePreambleSigV4:
-			return fmt.Errorf("%w: expired: now %s, signature %s", apierr.GetAPIError(apierr.ErrExpiredPresignRequest),
+		awsCreds := credentials.NewStaticCredentials(authHeader.AccessKeyID, box.Gate.SecretKey, "")
-				now.Format(time.RFC3339), signatureDateTime.Format(time.RFC3339))
+		signer := v4.NewSigner(awsCreds)
+		signer.DisableURIPathEscaping = true
+
+		if authHeader.IsPresigned {
+			if err := checkPresignedDate(authHeader, signatureDateTime); err != nil {
+				return err
+			}
+
+			if _, err := signer.Presign(request, nil, authHeader.Service, authHeader.Region, authHeader.Expiration, signatureDateTime); err != nil {
+				return fmt.Errorf("failed to pre-sign temporary HTTP request: %w", err)
+			}
+			signature = request.URL.Query().Get(AmzSignature)
+		} else {
+			if _, err := signer.Sign(request, nil, authHeader.Service, authHeader.Region, signatureDateTime); err != nil {
+				return fmt.Errorf("failed to sign temporary HTTP request: %w", err)
+			}
+			signature = c.reg.GetSubmatches(request.Header.Get(AuthorizationHdr))["v4_signature"]
 		}
-		if now.Before(signatureDateTime) {
+		if authHeader.Signature != signature {
-			return fmt.Errorf("%w: signature time from the future: now %s, signature %s", apierr.GetAPIError(apierr.ErrBadRequest),
+			return fmt.Errorf("%w: %s != %s: headers %v", apierr.GetAPIError(apierr.ErrSignatureDoesNotMatch),
-				now.Format(time.RFC3339), signatureDateTime.Format(time.RFC3339))
+				authHeader.Signature, signature, authHeader.SignedFields)
 		}
-		if _, err := signer.Presign(request, nil, authHeader.Service, authHeader.Region, authHeader.Expiration, signatureDateTime); err != nil {
+
-			return fmt.Errorf("failed to pre-sign temporary HTTP request: %w", err)
+	case signaturePreambleSigV4A:
+		signer := v4a.NewSigner(func(options *v4a.SignerOptions) {
+			options.DisableURIPathEscaping = true
+			options.LogSigning = true
+			options.Logger = logging.NewStandardLogger(os.Stdout)
+		})
+
+		credAdapter := v4a.SymmetricCredentialAdaptor{
+			SymmetricProvider: credentialsv2.NewStaticCredentialsProvider(authHeader.AccessKeyID, box.Gate.SecretKey, ""),
 		}
-		signature = request.URL.Query().Get(AmzSignature)
+
-	} else {
+		creds, err := credAdapter.RetrievePrivateKey(request.Context())
-		if _, err := signer.Sign(request, nil, authHeader.Service, authHeader.Region, signatureDateTime); err != nil {
+		if err != nil {
-			return fmt.Errorf("failed to sign temporary HTTP request: %w", err)
+			return fmt.Errorf("failed to derive assymetric key from credentials: %w", err)
 		}
-		signature = c.reg.GetSubmatches(request.Header.Get(AuthorizationHdr))["v4_signature"]
+
+		if authHeader.IsPresigned {
+			if err = checkPresignedDate(authHeader, signatureDateTime); err != nil {
+				return err
+			}
+		}
+
+		return signer.VerifySignature(creds, request, authHeader.PayloadHash, authHeader.Service,
+			strings.Split(authHeader.Region, ","), signatureDateTime, authHeader.Signature)
+	default:
+		return fmt.Errorf("invalid preamble: %s", authHeader.Preamble)
 	}
 
-	if authHeader.SignatureV4 != signature {
+	return nil
-		return fmt.Errorf("%w: %s != %s: headers %v", apierr.GetAPIError(apierr.ErrSignatureDoesNotMatch),
+}
-			authHeader.SignatureV4, signature, authHeader.SignedFields)
-	}
 
+func checkPresignedDate(authHeader *AuthHeader, signatureDateTime time.Time) error {
+	now := time.Now()
+	if signatureDateTime.Add(authHeader.Expiration).Before(now) {
+		return fmt.Errorf("%w: expired: now %s, signature %s", apierr.GetAPIError(apierr.ErrExpiredPresignRequest),
+			now.Format(time.RFC3339), signatureDateTime.Format(time.RFC3339))
+	}
+	if now.Before(signatureDateTime) {
+		return fmt.Errorf("%w: signature time from the future: now %s, signature %s", apierr.GetAPIError(apierr.ErrBadRequest),
+			now.Format(time.RFC3339), signatureDateTime.Format(time.RFC3339))
+	}
 	return nil
 }
 

api/auth/center_test.go

@@ -14,6 +14,7 @@ import (
 
 	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
+	v4a "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/tokens"
@@ -25,6 +26,8 @@ import (
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/aws/aws-sdk-go/aws/credentials"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap/zaptest"
 )
@@ -60,7 +63,7 @@ func TestAuthHeaderParse(t *testing.T) {
 				AccessKeyID:  "oid0cid",
 				Service:      "s3",
 				Region:       "us-east-1",
-				SignatureV4:  "2811ccb9e242f41426738fb1f",
+				Signature:    "2811ccb9e242f41426738fb1f",
 				SignedFields: []string{"host", "x-amz-content-sha256", "x-amz-date"},
 				Date:         "20210809",
 			},
@@ -71,7 +74,7 @@ func TestAuthHeaderParse(t *testing.T) {
 			expected: nil,
 		},
 	} {
-		authHeader, err := center.parseAuthHeader(tc.header)
+		authHeader, err := center.parseAuthHeader(tc.header, nil)
 		require.ErrorIs(t, err, tc.err, tc.header)
 		require.Equal(t, tc.expected, authHeader, tc.header)
 	}
@@ -90,6 +93,41 @@ func TestSignature(t *testing.T) {
 	require.Equal(t, "dfbe886241d9e369cf4b329ca0f15eb27306c97aa1022cc0bb5a914c4ef87634", signature)
 }
 
+func TestSignatureV4A(t *testing.T) {
+	var accessKeyAddr oid.Address
+	err := accessKeyAddr.DecodeString("8N7CYBY74kxZXoyvA5UNdmovaXqFpwNfvEPsqaN81es2/3tDwq5tR8fByrJcyJwyiuYX7Dae8tyDT7pd8oaL1MBto")
+	require.NoError(t, err)
+
+	accessKeyID := strings.ReplaceAll(accessKeyAddr.String(), "/", "0")
+	secretKey := "713d0a0b9efc7d22923e17b0402a6a89b4273bc711c8bacb2da1b643d0006aeb"
+
+	signer := v4a.NewSigner(func(options *v4a.SignerOptions) {
+		options.DisableURIPathEscaping = true
+	})
+
+	credAdapter := v4a.SymmetricCredentialAdaptor{
+		SymmetricProvider: credentialsv2.NewStaticCredentialsProvider(accessKeyID, secretKey, ""),
+	}
+
+	req, err := http.NewRequest("GET", "http://localhost:8084/bucket/object", nil)
+	require.NoError(t, err)
+
+	creds, err := credAdapter.RetrievePrivateKey(req.Context())
+	require.NoError(t, err)
+
+	signingTime := time.Now()
+	service := "s3"
+	regionSet := []string{"spb"}
+
+	err = signer.SignHTTP(req.Context(), creds, req, "", service, regionSet, signingTime)
+	require.NoError(t, err)
+
+	signature := NewRegexpMatcher(authorizationFieldV4aRegexp).GetSubmatches(req.Header.Get(AuthorizationHdr))["v4_signature"]
+
+	err = signer.VerifySignature(creds, req, "", service, regionSet, signingTime, signature)
+	require.NoError(t, err)
+}
+
 func TestCheckFormatContentSHA256(t *testing.T) {
 	defaultErr := errors.GetAPIError(errors.ErrContentSHA256Mismatch)
 

api/auth/presign.go

@@ -3,12 +3,17 @@ package auth
 import (
 	"fmt"
 	"net/http"
+	"os"
+	"strconv"
 	"strings"
 	"time"
 
 	v4 "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4"
+	v4a "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2"
+	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
 	"github.com/aws/aws-sdk-go/aws/credentials"
 	"github.com/aws/aws-sdk-go/private/protocol/rest"
+	"github.com/aws/smithy-go/logging"
 )
 
 type RequestData struct {
@@ -49,3 +54,39 @@ func PresignRequest(creds *credentials.Credentials, reqData RequestData, presign
 
 	return req, nil
 }
+
+// PresignRequestV4a forms pre-signed request to access objects without aws credentials.
+func PresignRequestV4a(credProvider credentialsv2.StaticCredentialsProvider, reqData RequestData, presignData PresignData) (*http.Request, error) {
+	urlStr := fmt.Sprintf("%s/%s/%s", reqData.Endpoint, rest.EscapePath(reqData.Bucket, false), rest.EscapePath(reqData.Object, false))
+	req, err := http.NewRequest(strings.ToUpper(reqData.Method), urlStr, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new request: %w", err)
+	}
+
+	req.Header.Set(AmzDate, presignData.SignTime.Format("20060102T150405Z"))
+	req.Header.Set(ContentTypeHdr, "text/plain")
+	req.Header.Set(AmzExpires, strconv.Itoa(int(presignData.Lifetime.Seconds())))
+
+	signer := v4a.NewSigner(func(options *v4a.SignerOptions) {
+		options.DisableURIPathEscaping = true
+		options.LogSigning = true
+		options.Logger = logging.NewStandardLogger(os.Stdout)
+	})
+
+	credAdapter := v4a.SymmetricCredentialAdaptor{
+		SymmetricProvider: credProvider,
+	}
+
+	creds, err := credAdapter.RetrievePrivateKey(req.Context())
+	if err != nil {
+		return nil, fmt.Errorf("failed to derive assymetric key from credentials: %w", err)
+	}
+	presignedURL, _, err := signer.PresignHTTP(req.Context(), creds, req, "", presignData.Service, []string{presignData.Region}, presignData.SignTime)
+	if err != nil {
+		return nil, fmt.Errorf("presign: %w", err)
+	}
+
+	fmt.Println(presignedURL)
+
+	return http.NewRequest(reqData.Method, presignedURL, nil)
+}

api/auth/presign_test.go

@@ -2,17 +2,23 @@ package auth
 
 import (
 	"context"
+	"fmt"
+	"net/http"
+	"os"
 	"strings"
 	"testing"
 	"time"
 
+	v4a "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/tokens"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
 	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/smithy-go/logging"
 	"github.com/stretchr/testify/require"
 )
 
@@ -93,3 +99,93 @@ func TestCheckSign(t *testing.T) {
 	require.NoError(t, err)
 	require.EqualValues(t, expBox, box.AccessBox)
 }
+
+func TestCheckSignV4a(t *testing.T) {
+	var accessKeyAddr oid.Address
+	err := accessKeyAddr.DecodeString("8N7CYBY74kxZXoyvA5UNdmovaXqFpwNfvEPsqaN81es2/3tDwq5tR8fByrJcyJwyiuYX7Dae8tyDT7pd8oaL1MBto")
+	require.NoError(t, err)
+
+	accessKeyID := strings.ReplaceAll(accessKeyAddr.String(), "/", "0")
+	secretKey := "713d0a0b9efc7d22923e17b0402a6a89b4273bc711c8bacb2da1b643d0006aeb"
+	awsCreds := credentialsv2.NewStaticCredentialsProvider(accessKeyID, secretKey, "")
+
+	reqData := RequestData{
+		Method:   "GET",
+		Endpoint: "http://localhost:8084",
+		Bucket:   "my-bucket",
+		Object:   "@obj/name",
+	}
+	presignData := PresignData{
+		Service:  "s3",
+		Region:   "spb",
+		Lifetime: 10 * time.Minute,
+		SignTime: time.Now().UTC(),
+	}
+
+	req, err := PresignRequestV4a(awsCreds, reqData, presignData)
+	require.NoError(t, err)
+
+	expBox := &accessbox.Box{
+		Gate: &accessbox.GateData{
+			SecretKey: secretKey,
+		},
+	}
+
+	mock := newTokensFrostfsMock()
+	mock.addBox(accessKeyAddr, expBox)
+
+	c := &Center{
+		cli:     mock,
+		regV4a:  NewRegexpMatcher(authorizationFieldV4aRegexp),
+		postReg: NewRegexpMatcher(postPolicyCredentialRegexp),
+	}
+	box, err := c.Authenticate(req)
+	require.NoError(t, err)
+	require.EqualValues(t, expBox, box.AccessBox)
+}
+
+func TestPresignRequestV4a(t *testing.T) {
+	var accessKeyAddr oid.Address
+	err := accessKeyAddr.DecodeString("8N7CYBY74kxZXoyvA5UNdmovaXqFpwNfvEPsqaN81es2/3tDwq5tR8fByrJcyJwyiuYX7Dae8tyDT7pd8oaL1MBto")
+	require.NoError(t, err)
+
+	accessKeyID := strings.ReplaceAll(accessKeyAddr.String(), "/", "0")
+	secretKey := "713d0a0b9efc7d22923e17b0402a6a89b4273bc711c8bacb2da1b643d0006aeb"
+
+	signer := v4a.NewSigner(func(options *v4a.SignerOptions) {
+		options.DisableURIPathEscaping = true
+		options.LogSigning = true
+		options.Logger = logging.NewStandardLogger(os.Stdout)
+	})
+
+	credAdapter := v4a.SymmetricCredentialAdaptor{
+		SymmetricProvider: credentialsv2.NewStaticCredentialsProvider(accessKeyID, secretKey, ""),
+	}
+
+	creds, err := credAdapter.RetrievePrivateKey(context.TODO())
+	require.NoError(t, err)
+
+	signingTime := time.Now()
+	service := "s3"
+	regionSet := []string{"spb"}
+
+	req, err := http.NewRequest("GET", "http://localhost:8084/bucket/object", nil)
+	require.NoError(t, err)
+	//req.Header.Set(AmzRegionSet, strings.Join(regionSet, ","))
+	//req.Header.Set(AmzDate, signingTime.Format("20060102T150405Z"))
+	//req.Header.Set(AmzAlgorithm, signaturePreambleSigV4A)
+
+	presignedURL, hdr, err := signer.PresignHTTP(req.Context(), creds, req, "", service, regionSet, signingTime)
+	require.NoError(t, err)
+
+	fmt.Println(presignedURL)
+	fmt.Println(hdr)
+
+	signature := req.URL.Query().Get(AmzSignature)
+
+	r, err := http.NewRequest("GET", presignedURL, nil)
+	require.NoError(t, err)
+
+	err = signer.VerifySignature(creds, r, "", service, regionSet, signingTime, signature)
+	require.NoError(t, err)
+}

api/auth/signer/v4asdk2/credentials.go

@@ -0,0 +1,140 @@
+package v4a
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// Credentials is Context, ECDSA, and Optional Session Token that can be used
+// to sign requests using SigV4a
+type Credentials struct {
+	Context      string
+	PrivateKey   *ecdsa.PrivateKey
+	SessionToken string
+
+	// Time the credentials will expire.
+	CanExpire bool
+	Expires   time.Time
+}
+
+// Expired returns if the credentials have expired.
+func (v Credentials) Expired() bool {
+	if v.CanExpire {
+		return !v.Expires.After(time.Now())
+	}
+
+	return false
+}
+
+// HasKeys returns if the credentials keys are set.
+func (v Credentials) HasKeys() bool {
+	return len(v.Context) > 0 && v.PrivateKey != nil
+}
+
+// SymmetricCredentialAdaptor wraps a SigV4 AccessKey/SecretKey provider and adapts the credentials
+// to a ECDSA PrivateKey for signing with SiV4a
+type SymmetricCredentialAdaptor struct {
+	SymmetricProvider aws.CredentialsProvider
+
+	asymmetric atomic.Value
+	m          sync.Mutex
+}
+
+// Retrieve retrieves symmetric credentials from the underlying provider.
+func (s *SymmetricCredentialAdaptor) Retrieve(ctx context.Context) (aws.Credentials, error) {
+	symCreds, err := s.retrieveFromSymmetricProvider(ctx)
+	if err != nil {
+		return aws.Credentials{}, err
+	}
+
+	if asymCreds := s.getCreds(); asymCreds == nil {
+		return symCreds, nil
+	}
+
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	asymCreds := s.getCreds()
+	if asymCreds == nil {
+		return symCreds, nil
+	}
+
+	// if the context does not match the access key id clear it
+	if asymCreds.Context != symCreds.AccessKeyID {
+		s.asymmetric.Store((*Credentials)(nil))
+	}
+
+	return symCreds, nil
+}
+
+// RetrievePrivateKey returns credentials suitable for SigV4a signing
+func (s *SymmetricCredentialAdaptor) RetrievePrivateKey(ctx context.Context) (Credentials, error) {
+	if asymCreds := s.getCreds(); asymCreds != nil {
+		return *asymCreds, nil
+	}
+
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	if asymCreds := s.getCreds(); asymCreds != nil {
+		return *asymCreds, nil
+	}
+
+	symmetricCreds, err := s.retrieveFromSymmetricProvider(ctx)
+	if err != nil {
+		return Credentials{}, fmt.Errorf("failed to retrieve symmetric credentials: %v", err)
+	}
+
+	privateKey, err := deriveKeyFromAccessKeyPair(symmetricCreds.AccessKeyID, symmetricCreds.SecretAccessKey)
+	if err != nil {
+		return Credentials{}, fmt.Errorf("failed to derive assymetric key from credentials")
+	}
+
+	creds := Credentials{
+		Context:      symmetricCreds.AccessKeyID,
+		PrivateKey:   privateKey,
+		SessionToken: symmetricCreds.SessionToken,
+		CanExpire:    symmetricCreds.CanExpire,
+		Expires:      symmetricCreds.Expires,
+	}
+
+	s.asymmetric.Store(&creds)
+
+	return creds, nil
+}
+
+func (s *SymmetricCredentialAdaptor) getCreds() *Credentials {
+	v := s.asymmetric.Load()
+
+	if v == nil {
+		return nil
+	}
+
+	c := v.(*Credentials)
+	if c != nil && c.HasKeys() && !c.Expired() {
+		return c
+	}
+
+	return nil
+}
+
+func (s *SymmetricCredentialAdaptor) retrieveFromSymmetricProvider(ctx context.Context) (aws.Credentials, error) {
+	credentials, err := s.SymmetricProvider.Retrieve(ctx)
+	if err != nil {
+		return aws.Credentials{}, err
+	}
+
+	return credentials, nil
+}
+
+// CredentialsProvider is the interface for a provider to retrieve credentials
+// to sign requests with.
+type CredentialsProvider interface {
+	RetrievePrivateKey(context.Context) (Credentials, error)
+}

api/auth/signer/v4asdk2/credentials_test.go

@@ -0,0 +1,77 @@
+package v4a
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+type rotatingCredsProvider struct {
+	count int
+	fail  chan struct{}
+}
+
+func (r *rotatingCredsProvider) Retrieve(ctx context.Context) (aws.Credentials, error) {
+	select {
+	case <-r.fail:
+		return aws.Credentials{}, fmt.Errorf("rotatingCredsProvider error")
+	default:
+	}
+	credentials := aws.Credentials{
+		AccessKeyID:     fmt.Sprintf("ACCESS_KEY_ID_%d", r.count),
+		SecretAccessKey: fmt.Sprintf("SECRET_ACCESS_KEY_%d", r.count),
+		SessionToken:    fmt.Sprintf("SESSION_TOKEN_%d", r.count),
+	}
+	return credentials, nil
+}
+
+func TestSymmetricCredentialAdaptor(t *testing.T) {
+	provider := &rotatingCredsProvider{
+		count: 0,
+		fail:  make(chan struct{}),
+	}
+
+	adaptor := &SymmetricCredentialAdaptor{SymmetricProvider: provider}
+
+	if symCreds, err := adaptor.Retrieve(context.Background()); err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	} else if !symCreds.HasKeys() {
+		t.Fatalf("expect symmetric credentials to have keys")
+	}
+
+	if load := adaptor.asymmetric.Load(); load != nil {
+		t.Errorf("expect asymmetric credentials to be nil")
+	}
+
+	if asymCreds, err := adaptor.RetrievePrivateKey(context.Background()); err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	} else if !asymCreds.HasKeys() {
+		t.Fatalf("expect asymmetric credentials to have keys")
+	}
+
+	if _, err := adaptor.Retrieve(context.Background()); err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	if load := adaptor.asymmetric.Load(); load.(*Credentials) == nil {
+		t.Errorf("expect asymmetric credentials to be not nil")
+	}
+
+	provider.count++
+
+	if _, err := adaptor.Retrieve(context.Background()); err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	if load := adaptor.asymmetric.Load(); load.(*Credentials) != nil {
+		t.Errorf("expect asymmetric credentials to be nil")
+	}
+
+	close(provider.fail) // All requests to the original provider will now fail from this point-on.
+	_, err := adaptor.Retrieve(context.Background())
+	if err == nil {
+		t.Error("expect error, got nil")
+	}
+}

api/auth/signer/v4asdk2/error.go

@@ -0,0 +1,17 @@
+package v4a
+
+import "fmt"
+
+// SigningError indicates an error condition occurred while performing SigV4a signing
+type SigningError struct {
+	Err error
+}
+
+func (e *SigningError) Error() string {
+	return fmt.Sprintf("failed to sign request: %v", e.Err)
+}
+
+// Unwrap returns the underlying error cause
+func (e *SigningError) Unwrap() error {
+	return e.Err
+}

api/auth/signer/v4asdk2/internal/crypto/compare.go

@@ -0,0 +1,30 @@
+package crypto
+
+import "fmt"
+
+// ConstantTimeByteCompare is a constant-time byte comparison of x and y. This function performs an absolute comparison
+// if the two byte slices assuming they represent a big-endian number.
+//
+//		 error if len(x) != len(y)
+//	  -1 if x <  y
+//	   0 if x == y
+//	  +1 if x >  y
+func ConstantTimeByteCompare(x, y []byte) (int, error) {
+	if len(x) != len(y) {
+		return 0, fmt.Errorf("slice lengths do not match")
+	}
+
+	xLarger, yLarger := 0, 0
+
+	for i := 0; i < len(x); i++ {
+		xByte, yByte := int(x[i]), int(y[i])
+
+		x := ((yByte - xByte) >> 8) & 1
+		y := ((xByte - yByte) >> 8) & 1
+
+		xLarger |= x &^ yLarger
+		yLarger |= y &^ xLarger
+	}
+
+	return xLarger - yLarger, nil
+}

api/auth/signer/v4asdk2/internal/crypto/compare_test.go

@@ -0,0 +1,60 @@
+package crypto
+
+import (
+	"bytes"
+	"math/big"
+	"testing"
+)
+
+func TestConstantTimeByteCompare(t *testing.T) {
+	cases := []struct {
+		x, y      []byte
+		r         int
+		expectErr bool
+	}{
+		{x: []byte{}, y: []byte{}, r: 0},
+		{x: []byte{40}, y: []byte{30}, r: 1},
+		{x: []byte{30}, y: []byte{40}, r: -1},
+		{x: []byte{60, 40, 30, 10, 20}, y: []byte{50, 30, 20, 0, 10}, r: 1},
+		{x: []byte{50, 30, 20, 0, 10}, y: []byte{60, 40, 30, 10, 20}, r: -1},
+		{x: nil, y: []byte{}, r: 0},
+		{x: []byte{}, y: nil, r: 0},
+		{x: []byte{}, y: []byte{10}, expectErr: true},
+		{x: []byte{10}, y: []byte{}, expectErr: true},
+		{x: []byte{10, 20}, y: []byte{10}, expectErr: true},
+	}
+
+	for _, tt := range cases {
+		compare, err := ConstantTimeByteCompare(tt.x, tt.y)
+		if (err != nil) != tt.expectErr {
+			t.Fatalf("expectErr=%v, got %v", tt.expectErr, err)
+		}
+		if e, a := tt.r, compare; e != a {
+			t.Errorf("expect %v, got %v", e, a)
+		}
+	}
+}
+
+func BenchmarkConstantTimeCompare(b *testing.B) {
+	x, y := big.NewInt(1023), big.NewInt(1024)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		ConstantTimeByteCompare(x.Bytes(), y.Bytes())
+	}
+}
+
+func BenchmarkCompare(b *testing.B) {
+	x, y := big.NewInt(1023).Bytes(), big.NewInt(1024).Bytes()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		bytes.Compare(x, y)
+	}
+}
+
+func mustBigInt(s string) *big.Int {
+	b, ok := (&big.Int{}).SetString(s, 16)
+	if !ok {
+		panic("can't parse as big.Int")
+	}
+	return b
+}

api/auth/signer/v4asdk2/internal/crypto/ecc.go

@@ -0,0 +1,113 @@
+package crypto
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/hmac"
+	"encoding/asn1"
+	"encoding/binary"
+	"fmt"
+	"hash"
+	"math"
+	"math/big"
+)
+
+type ecdsaSignature struct {
+	R, S *big.Int
+}
+
+// ECDSAKey takes the given elliptic curve, and private key (d) byte slice
+// and returns the private ECDSA key.
+func ECDSAKey(curve elliptic.Curve, d []byte) *ecdsa.PrivateKey {
+	return ECDSAKeyFromPoint(curve, (&big.Int{}).SetBytes(d))
+}
+
+// ECDSAKeyFromPoint takes the given elliptic curve and point and returns the
+// private and public keypair
+func ECDSAKeyFromPoint(curve elliptic.Curve, d *big.Int) *ecdsa.PrivateKey {
+	pX, pY := curve.ScalarBaseMult(d.Bytes())
+
+	privKey := &ecdsa.PrivateKey{
+		PublicKey: ecdsa.PublicKey{
+			Curve: curve,
+			X:     pX,
+			Y:     pY,
+		},
+		D: d,
+	}
+
+	return privKey
+}
+
+// ECDSAPublicKey takes the provide curve and (x, y) coordinates and returns
+// *ecdsa.PublicKey. Returns an error if the given points are not on the curve.
+func ECDSAPublicKey(curve elliptic.Curve, x, y []byte) (*ecdsa.PublicKey, error) {
+	xPoint := (&big.Int{}).SetBytes(x)
+	yPoint := (&big.Int{}).SetBytes(y)
+
+	if !curve.IsOnCurve(xPoint, yPoint) {
+		return nil, fmt.Errorf("point(%v, %v) is not on the given curve", xPoint.String(), yPoint.String())
+	}
+
+	return &ecdsa.PublicKey{
+		Curve: curve,
+		X:     xPoint,
+		Y:     yPoint,
+	}, nil
+}
+
+// VerifySignature takes the provided public key, hash, and asn1 encoded signature and returns
+// whether the given signature is valid.
+func VerifySignature(key *ecdsa.PublicKey, hash []byte, signature []byte) (bool, error) {
+	var ecdsaSignature ecdsaSignature
+
+	_, err := asn1.Unmarshal(signature, &ecdsaSignature)
+	if err != nil {
+		return false, err
+	}
+
+	return ecdsa.Verify(key, hash, ecdsaSignature.R, ecdsaSignature.S), nil
+}
+
+// HMACKeyDerivation provides an implementation of a NIST-800-108 of a KDF (Key Derivation Function) in Counter Mode.
+// For the purposes of this implantation HMAC is used as the PRF (Pseudorandom function), where the value of
+// `r` is defined as a 4 byte counter.
+func HMACKeyDerivation(hash func() hash.Hash, bitLen int, key []byte, label, context []byte) ([]byte, error) {
+	// verify that we won't overflow the counter
+	n := int64(math.Ceil((float64(bitLen) / 8) / float64(hash().Size())))
+	if n > 0x7FFFFFFF {
+		return nil, fmt.Errorf("unable to derive key of size %d using 32-bit counter", bitLen)
+	}
+
+	// verify the requested bit length is not larger then the length encoding size
+	if int64(bitLen) > 0x7FFFFFFF {
+		return nil, fmt.Errorf("bitLen is greater than 32-bits")
+	}
+
+	fixedInput := bytes.NewBuffer(nil)
+	fixedInput.Write(label)
+	fixedInput.WriteByte(0x00)
+	fixedInput.Write(context)
+	if err := binary.Write(fixedInput, binary.BigEndian, int32(bitLen)); err != nil {
+		return nil, fmt.Errorf("failed to write bit length to fixed input string: %v", err)
+	}
+
+	var output []byte
+
+	h := hmac.New(hash, key)
+
+	for i := int64(1); i <= n; i++ {
+		h.Reset()
+		if err := binary.Write(h, binary.BigEndian, int32(i)); err != nil {
+			return nil, err
+		}
+		_, err := h.Write(fixedInput.Bytes())
+		if err != nil {
+			return nil, err
+		}
+		output = append(output, h.Sum(nil)...)
+	}
+
+	return output[:bitLen/8], nil
+}

api/auth/signer/v4asdk2/internal/crypto/ecc_test.go

@@ -0,0 +1,277 @@
+package crypto
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/sha256"
+	"io"
+	"testing"
+)
+
+func TestECDSAPublicKeyDerivation_P256(t *testing.T) {
+	d := []byte{
+		0xc9, 0x80, 0x68, 0x98, 0xa0, 0x33, 0x49, 0x16, 0xc8, 0x60, 0x74, 0x88, 0x80, 0xa5, 0x41, 0xf0,
+		0x93, 0xb5, 0x79, 0xa9, 0xb1, 0xf3, 0x29, 0x34, 0xd8, 0x6c, 0x36, 0x3c, 0x39, 0x80, 0x03, 0x57,
+	}
+
+	x := []byte{
+		0xd0, 0x72, 0x0d, 0xc6, 0x91, 0xaa, 0x80, 0x09, 0x6b, 0xa3, 0x2f, 0xed, 0x1c, 0xb9, 0x7c, 0x2b,
+		0x62, 0x06, 0x90, 0xd0, 0x6d, 0xe0, 0x31, 0x7b, 0x86, 0x18, 0xd5, 0xce, 0x65, 0xeb, 0x72, 0x8f,
+	}
+
+	y := []byte{
+		0x96, 0x81, 0xb5, 0x17, 0xb1, 0xcd, 0xa1, 0x7d, 0x0d, 0x83, 0xd3, 0x35, 0xd9, 0xc4, 0xa8, 0xa9,
+		0xa9, 0xb0, 0xb1, 0xb3, 0xc7, 0x10, 0x6d, 0x8f, 0x3c, 0x72, 0xbc, 0x50, 0x93, 0xdc, 0x27, 0x5f,
+	}
+
+	testKeyDerivation(t, elliptic.P256(), d, x, y)
+}
+
+func TestECDSAPublicKeyDerivation_P384(t *testing.T) {
+	d := []byte{
+		0x53, 0x94, 0xf7, 0x97, 0x3e, 0xa8, 0x68, 0xc5, 0x2b, 0xf3, 0xff, 0x8d, 0x8c, 0xee, 0xb4, 0xdb,
+		0x90, 0xa6, 0x83, 0x65, 0x3b, 0x12, 0x48, 0x5d, 0x5f, 0x62, 0x7c, 0x3c, 0xe5, 0xab, 0xd8, 0x97,
+		0x8f, 0xc9, 0x67, 0x3d, 0x14, 0xa7, 0x1d, 0x92, 0x57, 0x47, 0x93, 0x16, 0x62, 0x49, 0x3c, 0x37,
+	}
+
+	x := []byte{
+		0xfd, 0x3c, 0x84, 0xe5, 0x68, 0x9b, 0xed, 0x27, 0x0e, 0x60, 0x1b, 0x3d, 0x80, 0xf9, 0x0d, 0x67,
+		0xa9, 0xae, 0x45, 0x1c, 0xce, 0x89, 0x0f, 0x53, 0xe5, 0x83, 0x22, 0x9a, 0xd0, 0xe2, 0xee, 0x64,
+		0x56, 0x11, 0xfa, 0x99, 0x36, 0xdf, 0xa4, 0x53, 0x06, 0xec, 0x18, 0x06, 0x67, 0x74, 0xaa, 0x24,
+	}
+
+	y := []byte{
+		0xb8, 0x3c, 0xa4, 0x12, 0x6c, 0xfc, 0x4c, 0x4d, 0x1d, 0x18, 0xa4, 0xb6, 0xc2, 0x1c, 0x7f, 0x69,
+		0x9d, 0x51, 0x23, 0xdd, 0x9c, 0x24, 0xf6, 0x6f, 0x83, 0x38, 0x46, 0xee, 0xb5, 0x82, 0x96, 0x19,
+		0x6b, 0x42, 0xec, 0x06, 0x42, 0x5d, 0xb5, 0xb7, 0x0a, 0x4b, 0x81, 0xb7, 0xfc, 0xf7, 0x05, 0xa0,
+	}
+
+	testKeyDerivation(t, elliptic.P384(), d, x, y)
+}
+
+func TestECDSAKnownSigningValue_P256(t *testing.T) {
+	d := []byte{
+		0x51, 0x9b, 0x42, 0x3d, 0x71, 0x5f, 0x8b, 0x58, 0x1f, 0x4f, 0xa8, 0xee, 0x59, 0xf4, 0x77, 0x1a,
+		0x5b, 0x44, 0xc8, 0x13, 0x0b, 0x4e, 0x3e, 0xac, 0xca, 0x54, 0xa5, 0x6d, 0xda, 0x72, 0xb4, 0x64,
+	}
+
+	testKnownSigningValue(t, elliptic.P256(), d)
+}
+
+func TestECDSAKnownSigningValue_P384(t *testing.T) {
+	d := []byte{
+		0x53, 0x94, 0xf7, 0x97, 0x3e, 0xa8, 0x68, 0xc5, 0x2b, 0xf3, 0xff, 0x8d, 0x8c, 0xee, 0xb4, 0xdb,
+		0x90, 0xa6, 0x83, 0x65, 0x3b, 0x12, 0x48, 0x5d, 0x5f, 0x62, 0x7c, 0x3c, 0xe5, 0xab, 0xd8, 0x97,
+		0x8f, 0xc9, 0x67, 0x3d, 0x14, 0xa7, 0x1d, 0x92, 0x57, 0x47, 0x93, 0x16, 0x62, 0x49, 0x3c, 0x37,
+	}
+
+	testKnownSigningValue(t, elliptic.P384(), d)
+}
+
+func testKeyDerivation(t *testing.T, curve elliptic.Curve, d, expectedX, expectedY []byte) {
+	privKey := ECDSAKey(curve, d)
+
+	if e, a := d, privKey.D.Bytes(); bytes.Compare(e, a) != 0 {
+		t.Errorf("expected % x, got % x", e, a)
+	}
+
+	if e, a := expectedX, privKey.X.Bytes(); bytes.Compare(e, a) != 0 {
+		t.Errorf("expected % x, got % x", e, a)
+	}
+
+	if e, a := expectedY, privKey.Y.Bytes(); bytes.Compare(e, a) != 0 {
+		t.Errorf("expected % x, got % x", e, a)
+	}
+}
+
+func testKnownSigningValue(t *testing.T, curve elliptic.Curve, d []byte) {
+	signingKey := ECDSAKey(curve, d)
+
+	message := []byte{
+		0x59, 0x05, 0x23, 0x88, 0x77, 0xc7, 0x74, 0x21, 0xf7, 0x3e, 0x43, 0xee, 0x3d, 0xa6, 0xf2, 0xd9,
+		0xe2, 0xcc, 0xad, 0x5f, 0xc9, 0x42, 0xdc, 0xec, 0x0c, 0xbd, 0x25, 0x48, 0x29, 0x35, 0xfa, 0xaf,
+		0x41, 0x69, 0x83, 0xfe, 0x16, 0x5b, 0x1a, 0x04, 0x5e, 0xe2, 0xbc, 0xd2, 0xe6, 0xdc, 0xa3, 0xbd,
+		0xf4, 0x6c, 0x43, 0x10, 0xa7, 0x46, 0x1f, 0x9a, 0x37, 0x96, 0x0c, 0xa6, 0x72, 0xd3, 0xfe, 0xb5,
+		0x47, 0x3e, 0x25, 0x36, 0x05, 0xfb, 0x1d, 0xdf, 0xd2, 0x80, 0x65, 0xb5, 0x3c, 0xb5, 0x85, 0x8a,
+		0x8a, 0xd2, 0x81, 0x75, 0xbf, 0x9b, 0xd3, 0x86, 0xa5, 0xe4, 0x71, 0xea, 0x7a, 0x65, 0xc1, 0x7c,
+		0xc9, 0x34, 0xa9, 0xd7, 0x91, 0xe9, 0x14, 0x91, 0xeb, 0x37, 0x54, 0xd0, 0x37, 0x99, 0x79, 0x0f,
+		0xe2, 0xd3, 0x08, 0xd1, 0x61, 0x46, 0xd5, 0xc9, 0xb0, 0xd0, 0xde, 0xbd, 0x97, 0xd7, 0x9c, 0xe8,
+	}
+
+	sha256Hash := sha256.New()
+	_, err := io.Copy(sha256Hash, bytes.NewReader(message))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	msgHash := sha256Hash.Sum(nil)
+	msgSignature, err := signingKey.Sign(rand.Reader, msgHash, crypto.SHA256)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	verified, err := VerifySignature(&signingKey.PublicKey, msgHash, msgSignature)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if !verified {
+		t.Fatalf("failed to verify message msgSignature")
+	}
+}
+
+func TestECDSAInvalidSignature_P256(t *testing.T) {
+	testInvalidSignature(t, elliptic.P256())
+}
+
+func TestECDSAInvalidSignature_P384(t *testing.T) {
+	testInvalidSignature(t, elliptic.P384())
+}
+
+func TestECDSAGenKeySignature_P256(t *testing.T) {
+	testGenKeySignature(t, elliptic.P256())
+}
+
+func TestECDSAGenKeySignature_P384(t *testing.T) {
+	testGenKeySignature(t, elliptic.P384())
+}
+
+func testInvalidSignature(t *testing.T, curve elliptic.Curve) {
+	privateKey, err := ecdsa.GenerateKey(curve, rand.Reader)
+	if err != nil {
+		t.Fatalf("failed to generate key: %v", err)
+	}
+
+	message := []byte{
+		0x59, 0x05, 0x23, 0x88, 0x77, 0xc7, 0x74, 0x21, 0xf7, 0x3e, 0x43, 0xee, 0x3d, 0xa6, 0xf2, 0xd9,
+		0xe2, 0xcc, 0xad, 0x5f, 0xc9, 0x42, 0xdc, 0xec, 0x0c, 0xbd, 0x25, 0x48, 0x29, 0x35, 0xfa, 0xaf,
+		0x41, 0x69, 0x83, 0xfe, 0x16, 0x5b, 0x1a, 0x04, 0x5e, 0xe2, 0xbc, 0xd2, 0xe6, 0xdc, 0xa3, 0xbd,
+		0xf4, 0x6c, 0x43, 0x10, 0xa7, 0x46, 0x1f, 0x9a, 0x37, 0x96, 0x0c, 0xa6, 0x72, 0xd3, 0xfe, 0xb5,
+		0x47, 0x3e, 0x25, 0x36, 0x05, 0xfb, 0x1d, 0xdf, 0xd2, 0x80, 0x65, 0xb5, 0x3c, 0xb5, 0x85, 0x8a,
+		0x8a, 0xd2, 0x81, 0x75, 0xbf, 0x9b, 0xd3, 0x86, 0xa5, 0xe4, 0x71, 0xea, 0x7a, 0x65, 0xc1, 0x7c,
+		0xc9, 0x34, 0xa9, 0xd7, 0x91, 0xe9, 0x14, 0x91, 0xeb, 0x37, 0x54, 0xd0, 0x37, 0x99, 0x79, 0x0f,
+		0xe2, 0xd3, 0x08, 0xd1, 0x61, 0x46, 0xd5, 0xc9, 0xb0, 0xd0, 0xde, 0xbd, 0x97, 0xd7, 0x9c, 0xe8,
+	}
+
+	sha256Hash := sha256.New()
+	_, err = io.Copy(sha256Hash, bytes.NewReader(message))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	msgHash := sha256Hash.Sum(nil)
+	msgSignature, err := privateKey.Sign(rand.Reader, msgHash, crypto.SHA256)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	byteToFlip := 15
+	switch msgSignature[byteToFlip] {
+	case 0:
+		msgSignature[byteToFlip] = 0x0a
+	default:
+		msgSignature[byteToFlip] &^= msgSignature[byteToFlip]
+	}
+
+	verified, err := VerifySignature(&privateKey.PublicKey, msgHash, msgSignature)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if verified {
+		t.Fatalf("expected message verification to fail")
+	}
+}
+
+func testGenKeySignature(t *testing.T, curve elliptic.Curve) {
+	privateKey, err := ecdsa.GenerateKey(curve, rand.Reader)
+	if err != nil {
+		t.Fatalf("failed to generate key: %v", err)
+	}
+
+	message := []byte{
+		0x59, 0x05, 0x23, 0x88, 0x77, 0xc7, 0x74, 0x21, 0xf7, 0x3e, 0x43, 0xee, 0x3d, 0xa6, 0xf2, 0xd9,
+		0xe2, 0xcc, 0xad, 0x5f, 0xc9, 0x42, 0xdc, 0xec, 0x0c, 0xbd, 0x25, 0x48, 0x29, 0x35, 0xfa, 0xaf,
+		0x41, 0x69, 0x83, 0xfe, 0x16, 0x5b, 0x1a, 0x04, 0x5e, 0xe2, 0xbc, 0xd2, 0xe6, 0xdc, 0xa3, 0xbd,
+		0xf4, 0x6c, 0x43, 0x10, 0xa7, 0x46, 0x1f, 0x9a, 0x37, 0x96, 0x0c, 0xa6, 0x72, 0xd3, 0xfe, 0xb5,
+		0x47, 0x3e, 0x25, 0x36, 0x05, 0xfb, 0x1d, 0xdf, 0xd2, 0x80, 0x65, 0xb5, 0x3c, 0xb5, 0x85, 0x8a,
+		0x8a, 0xd2, 0x81, 0x75, 0xbf, 0x9b, 0xd3, 0x86, 0xa5, 0xe4, 0x71, 0xea, 0x7a, 0x65, 0xc1, 0x7c,
+		0xc9, 0x34, 0xa9, 0xd7, 0x91, 0xe9, 0x14, 0x91, 0xeb, 0x37, 0x54, 0xd0, 0x37, 0x99, 0x79, 0x0f,
+		0xe2, 0xd3, 0x08, 0xd1, 0x61, 0x46, 0xd5, 0xc9, 0xb0, 0xd0, 0xde, 0xbd, 0x97, 0xd7, 0x9c, 0xe8,
+	}
+
+	sha256Hash := sha256.New()
+	_, err = io.Copy(sha256Hash, bytes.NewReader(message))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	msgHash := sha256Hash.Sum(nil)
+	msgSignature, err := privateKey.Sign(rand.Reader, msgHash, crypto.SHA256)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	verified, err := VerifySignature(&privateKey.PublicKey, msgHash, msgSignature)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if !verified {
+		t.Fatalf("expected message verification to fail")
+	}
+}
+
+func TestECDSASignatureFormat(t *testing.T) {
+	asn1Signature := []byte{
+		0x30, 0x45, 0x02, 0x21, 0x00, 0xd7, 0xc5, 0xb9, 0x9e, 0x0b, 0xb1, 0x1a, 0x1f, 0x32, 0xda, 0x66, 0xe0, 0xff,
+		0x59, 0xb7, 0x8a, 0x5e, 0xb3, 0x94, 0x9c, 0x23, 0xb3, 0xfc, 0x1f, 0x18, 0xcc, 0xf6, 0x61, 0x67, 0x8b, 0xf1,
+		0xc1, 0x02, 0x20, 0x26, 0x4d, 0x8b, 0x7c, 0xaa, 0x52, 0x4c, 0xc0, 0x2e, 0x5f, 0xf6, 0x7e, 0x24, 0x82, 0xe5,
+		0xfb, 0xcb, 0xc7, 0x9b, 0x83, 0x0d, 0x19, 0x7e, 0x7a, 0x40, 0x37, 0x87, 0xdd, 0x1c, 0x93, 0x13, 0xc4,
+	}
+
+	x := []byte{
+		0x1c, 0xcb, 0xe9, 0x1c, 0x07, 0x5f, 0xc7, 0xf4, 0xf0, 0x33, 0xbf, 0xa2, 0x48, 0xdb, 0x8f, 0xcc,
+		0xd3, 0x56, 0x5d, 0xe9, 0x4b, 0xbf, 0xb1, 0x2f, 0x3c, 0x59, 0xff, 0x46, 0xc2, 0x71, 0xbf, 0x83,
+	}
+
+	y := []byte{
+		0xce, 0x40, 0x14, 0xc6, 0x88, 0x11, 0xf9, 0xa2, 0x1a, 0x1f, 0xdb, 0x2c, 0x0e, 0x61, 0x13, 0xe0,
+		0x6d, 0xb7, 0xca, 0x93, 0xb7, 0x40, 0x4e, 0x78, 0xdc, 0x7c, 0xcd, 0x5c, 0xa8, 0x9a, 0x4c, 0xa9,
+	}
+
+	publicKey, err := ECDSAPublicKey(elliptic.P256(), x, y)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	message := []byte{
+		0x59, 0x05, 0x23, 0x88, 0x77, 0xc7, 0x74, 0x21, 0xf7, 0x3e, 0x43, 0xee, 0x3d, 0xa6, 0xf2, 0xd9,
+		0xe2, 0xcc, 0xad, 0x5f, 0xc9, 0x42, 0xdc, 0xec, 0x0c, 0xbd, 0x25, 0x48, 0x29, 0x35, 0xfa, 0xaf,
+		0x41, 0x69, 0x83, 0xfe, 0x16, 0x5b, 0x1a, 0x04, 0x5e, 0xe2, 0xbc, 0xd2, 0xe6, 0xdc, 0xa3, 0xbd,
+		0xf4, 0x6c, 0x43, 0x10, 0xa7, 0x46, 0x1f, 0x9a, 0x37, 0x96, 0x0c, 0xa6, 0x72, 0xd3, 0xfe, 0xb5,
+		0x47, 0x3e, 0x25, 0x36, 0x05, 0xfb, 0x1d, 0xdf, 0xd2, 0x80, 0x65, 0xb5, 0x3c, 0xb5, 0x85, 0x8a,
+		0x8a, 0xd2, 0x81, 0x75, 0xbf, 0x9b, 0xd3, 0x86, 0xa5, 0xe4, 0x71, 0xea, 0x7a, 0x65, 0xc1, 0x7c,
+		0xc9, 0x34, 0xa9, 0xd7, 0x91, 0xe9, 0x14, 0x91, 0xeb, 0x37, 0x54, 0xd0, 0x37, 0x99, 0x79, 0x0f,
+		0xe2, 0xd3, 0x08, 0xd1, 0x61, 0x46, 0xd5, 0xc9, 0xb0, 0xd0, 0xde, 0xbd, 0x97, 0xd7, 0x9c, 0xe8,
+	}
+
+	hash := sha256.New()
+	_, err = io.Copy(hash, bytes.NewReader(message))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+	msgHash := hash.Sum(nil)
+
+	verifySignature, err := VerifySignature(publicKey, msgHash, asn1Signature)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if !verifySignature {
+		t.Fatalf("failed to verify signature")
+	}
+}

api/auth/signer/v4asdk2/internal/v4/const.go

@@ -0,0 +1,36 @@
+package v4
+
+const (
+	// EmptyStringSHA256 is the hex encoded sha256 value of an empty string
+	EmptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
+
+	// UnsignedPayload indicates that the request payload body is unsigned
+	UnsignedPayload = "UNSIGNED-PAYLOAD"
+
+	// AmzAlgorithmKey indicates the signing algorithm
+	AmzAlgorithmKey = "X-Amz-Algorithm"
+
+	// AmzSecurityTokenKey indicates the security token to be used with temporary credentials
+	AmzSecurityTokenKey = "X-Amz-Security-Token"
+
+	// AmzDateKey is the UTC timestamp for the request in the format YYYYMMDD'T'HHMMSS'Z'
+	AmzDateKey = "X-Amz-Date"
+
+	// AmzCredentialKey is the access key ID and credential scope
+	AmzCredentialKey = "X-Amz-Credential"
+
+	// AmzSignedHeadersKey is the set of headers signed for the request
+	AmzSignedHeadersKey = "X-Amz-SignedHeaders"
+
+	// AmzSignatureKey is the query parameter to store the SigV4 signature
+	AmzSignatureKey = "X-Amz-Signature"
+
+	// TimeFormat is the time format to be used in the X-Amz-Date header or query parameter
+	TimeFormat = "20060102T150405Z"
+
+	// ShortTimeFormat is the shorten time format used in the credential scope
+	ShortTimeFormat = "20060102"
+
+	// ContentSHAKey is the SHA256 of request body
+	ContentSHAKey = "X-Amz-Content-Sha256"
+)

api/auth/signer/v4asdk2/internal/v4/header_rules.go

@@ -0,0 +1,88 @@
+package v4
+
+import (
+	"strings"
+)
+
+// Rules houses a set of Rule needed for validation of a
+// string value
+type Rules []Rule
+
+// Rule interface allows for more flexible rules and just simply
+// checks whether or not a value adheres to that Rule
+type Rule interface {
+	IsValid(value string) bool
+}
+
+// IsValid will iterate through all rules and see if any rules
+// apply to the value and supports nested rules
+func (r Rules) IsValid(value string) bool {
+	for _, rule := range r {
+		if rule.IsValid(value) {
+			return true
+		}
+	}
+	return false
+}
+
+// MapRule generic Rule for maps
+type MapRule map[string]struct{}
+
+// IsValid for the map Rule satisfies whether it exists in the map
+func (m MapRule) IsValid(value string) bool {
+	_, ok := m[value]
+	return ok
+}
+
+// AllowList is a generic Rule for whitelisting
+type AllowList struct {
+	Rule
+}
+
+// IsValid for AllowList checks if the value is within the AllowList
+func (w AllowList) IsValid(value string) bool {
+	return w.Rule.IsValid(value)
+}
+
+// DenyList is a generic Rule for blacklisting
+type DenyList struct {
+	Rule
+}
+
+// IsValid for AllowList checks if the value is within the AllowList
+func (b DenyList) IsValid(value string) bool {
+	return !b.Rule.IsValid(value)
+}
+
+// Patterns is a list of strings to match against
+type Patterns []string
+
+// IsValid for Patterns checks each pattern and returns if a match has
+// been found
+func (p Patterns) IsValid(value string) bool {
+	for _, pattern := range p {
+		if HasPrefixFold(value, pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+// InclusiveRules rules allow for rules to depend on one another
+type InclusiveRules []Rule
+
+// IsValid will return true if all rules are true
+func (r InclusiveRules) IsValid(value string) bool {
+	for _, rule := range r {
+		if !rule.IsValid(value) {
+			return false
+		}
+	}
+	return true
+}
+
+// HasPrefixFold tests whether the string s begins with prefix, interpreted as UTF-8 strings,
+// under Unicode case-folding.
+func HasPrefixFold(s, prefix string) bool {
+	return len(s) >= len(prefix) && strings.EqualFold(s[0:len(prefix)], prefix)
+}

api/auth/signer/v4asdk2/internal/v4/headers.go

@@ -0,0 +1,79 @@
+package v4
+
+// IgnoredPresignedHeaders is a list of headers that are ignored during signing
+var IgnoredPresignedHeaders = Rules{
+	DenyList{
+		MapRule{
+			"Authorization":   struct{}{},
+			"User-Agent":      struct{}{},
+			"X-Amzn-Trace-Id": struct{}{},
+		},
+	},
+}
+
+// IgnoredHeaders is a list of headers that are ignored during signing
+// drop User-Agent header to be compatible with aws sdk java v1.
+var IgnoredHeaders = Rules{
+	DenyList{
+		MapRule{
+			"Authorization": struct{}{},
+			//"User-Agent":      struct{}{},
+			"X-Amzn-Trace-Id": struct{}{},
+		},
+	},
+}
+
+// RequiredSignedHeaders is a whitelist for Build canonical headers.
+var RequiredSignedHeaders = Rules{
+	AllowList{
+		MapRule{
+			"Cache-Control":                         struct{}{},
+			"Content-Disposition":                   struct{}{},
+			"Content-Encoding":                      struct{}{},
+			"Content-Language":                      struct{}{},
+			"Content-Md5":                           struct{}{},
+			"Content-Type":                          struct{}{},
+			"Expires":                               struct{}{},
+			"If-Match":                              struct{}{},
+			"If-Modified-Since":                     struct{}{},
+			"If-None-Match":                         struct{}{},
+			"If-Unmodified-Since":                   struct{}{},
+			"Range":                                 struct{}{},
+			"X-Amz-Acl":                             struct{}{},
+			"X-Amz-Copy-Source":                     struct{}{},
+			"X-Amz-Copy-Source-If-Match":            struct{}{},
+			"X-Amz-Copy-Source-If-Modified-Since":   struct{}{},
+			"X-Amz-Copy-Source-If-None-Match":       struct{}{},
+			"X-Amz-Copy-Source-If-Unmodified-Since": struct{}{},
+			"X-Amz-Copy-Source-Range":               struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   struct{}{},
+			"X-Amz-Grant-Full-control":                                    struct{}{},
+			"X-Amz-Grant-Read":                                            struct{}{},
+			"X-Amz-Grant-Read-Acp":                                        struct{}{},
+			"X-Amz-Grant-Write":                                           struct{}{},
+			"X-Amz-Grant-Write-Acp":                                       struct{}{},
+			"X-Amz-Metadata-Directive":                                    struct{}{},
+			"X-Amz-Mfa":                                                   struct{}{},
+			"X-Amz-Request-Payer":                                         struct{}{},
+			"X-Amz-Server-Side-Encryption":                                struct{}{},
+			"X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id":                 struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm":             struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Key":                   struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":               struct{}{},
+			"X-Amz-Storage-Class":                                         struct{}{},
+			"X-Amz-Website-Redirect-Location":                             struct{}{},
+			"X-Amz-Content-Sha256":                                        struct{}{},
+			"X-Amz-Tagging":                                               struct{}{},
+		},
+	},
+	Patterns{"X-Amz-Meta-"},
+}
+
+// AllowedQueryHoisting is a whitelist for Build query headers. The boolean value
+// represents whether or not it is a pattern.
+var AllowedQueryHoisting = InclusiveRules{
+	DenyList{RequiredSignedHeaders},
+	Patterns{"X-Amz-"},
+}

api/auth/signer/v4asdk2/internal/v4/hmac.go

@@ -0,0 +1,13 @@
+package v4
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+)
+
+// HMACSHA256 computes a HMAC-SHA256 of data given the provided key.
+func HMACSHA256(key []byte, data []byte) []byte {
+	hash := hmac.New(sha256.New, key)
+	hash.Write(data)
+	return hash.Sum(nil)
+}

api/auth/signer/v4asdk2/internal/v4/host.go

@@ -0,0 +1,75 @@
+package v4
+
+import (
+	"net/http"
+	"strings"
+)
+
+// SanitizeHostForHeader removes default port from host and updates request.Host
+func SanitizeHostForHeader(r *http.Request) {
+	host := getHost(r)
+	port := portOnly(host)
+	if port != "" && isDefaultPort(r.URL.Scheme, port) {
+		r.Host = stripPort(host)
+	}
+}
+
+// Returns host from request
+func getHost(r *http.Request) string {
+	if r.Host != "" {
+		return r.Host
+	}
+
+	return r.URL.Host
+}
+
+// Hostname returns u.Host, without any port number.
+//
+// If Host is an IPv6 literal with a port number, Hostname returns the
+// IPv6 literal without the square brackets. IPv6 literals may include
+// a zone identifier.
+//
+// Copied from the Go 1.8 standard library (net/url)
+func stripPort(hostport string) string {
+	colon := strings.IndexByte(hostport, ':')
+	if colon == -1 {
+		return hostport
+	}
+	if i := strings.IndexByte(hostport, ']'); i != -1 {
+		return strings.TrimPrefix(hostport[:i], "[")
+	}
+	return hostport[:colon]
+}
+
+// Port returns the port part of u.Host, without the leading colon.
+// If u.Host doesn't contain a port, Port returns an empty string.
+//
+// Copied from the Go 1.8 standard library (net/url)
+func portOnly(hostport string) string {
+	colon := strings.IndexByte(hostport, ':')
+	if colon == -1 {
+		return ""
+	}
+	if i := strings.Index(hostport, "]:"); i != -1 {
+		return hostport[i+len("]:"):]
+	}
+	if strings.Contains(hostport, "]") {
+		return ""
+	}
+	return hostport[colon+len(":"):]
+}
+
+// Returns true if the specified URI is using the standard port
+// (i.e. port 80 for HTTP URIs or 443 for HTTPS URIs)
+func isDefaultPort(scheme, port string) bool {
+	if port == "" {
+		return true
+	}
+
+	lowerCaseScheme := strings.ToLower(scheme)
+	if (lowerCaseScheme == "http" && port == "80") || (lowerCaseScheme == "https" && port == "443") {
+		return true
+	}
+
+	return false
+}

api/auth/signer/v4asdk2/internal/v4/time.go

@@ -0,0 +1,36 @@
+package v4
+
+import "time"
+
+// SigningTime provides a wrapper around a time.Time which provides cached values for SigV4 signing.
+type SigningTime struct {
+	time.Time
+	timeFormat      string
+	shortTimeFormat string
+}
+
+// NewSigningTime creates a new SigningTime given a time.Time
+func NewSigningTime(t time.Time) SigningTime {
+	return SigningTime{
+		Time: t,
+	}
+}
+
+// TimeFormat provides a time formatted in the X-Amz-Date format.
+func (m *SigningTime) TimeFormat() string {
+	return m.format(&m.timeFormat, TimeFormat)
+}
+
+// ShortTimeFormat provides a time formatted of 20060102.
+func (m *SigningTime) ShortTimeFormat() string {
+	return m.format(&m.shortTimeFormat, ShortTimeFormat)
+}
+
+func (m *SigningTime) format(target *string, format string) string {
+	if len(*target) > 0 {
+		return *target
+	}
+	v := m.Time.Format(format)
+	*target = v
+	return v
+}

api/auth/signer/v4asdk2/internal/v4/util.go

@@ -0,0 +1,64 @@
+package v4
+
+import (
+	"net/url"
+	"strings"
+)
+
+const doubleSpace = "  "
+
+// StripExcessSpaces will rewrite the passed in slice's string values to not
+// contain muliple side-by-side spaces.
+func StripExcessSpaces(str string) string {
+	var j, k, l, m, spaces int
+	// Trim trailing spaces
+	for j = len(str) - 1; j >= 0 && str[j] == ' '; j-- {
+	}
+
+	// Trim leading spaces
+	for k = 0; k < j && str[k] == ' '; k++ {
+	}
+	str = str[k : j+1]
+
+	// Strip multiple spaces.
+	j = strings.Index(str, doubleSpace)
+	if j < 0 {
+		return str
+	}
+
+	buf := []byte(str)
+	for k, m, l = j, j, len(buf); k < l; k++ {
+		if buf[k] == ' ' {
+			if spaces == 0 {
+				// First space.
+				buf[m] = buf[k]
+				m++
+			}
+			spaces++
+		} else {
+			// End of multiple spaces.
+			spaces = 0
+			buf[m] = buf[k]
+			m++
+		}
+	}
+
+	return string(buf[:m])
+}
+
+// GetURIPath returns the escaped URI component from the provided URL
+func GetURIPath(u *url.URL) string {
+	var uri string
+
+	if len(u.Opaque) > 0 {
+		uri = "/" + strings.Join(strings.Split(u.Opaque, "/")[3:], "/")
+	} else {
+		uri = u.EscapedPath()
+	}
+
+	if len(uri) == 0 {
+		uri = "/"
+	}
+
+	return uri
+}

api/auth/signer/v4asdk2/internal/v4/util_test.go

@@ -0,0 +1,75 @@
+package v4
+
+import (
+	"testing"
+)
+
+func TestStripExcessHeaders(t *testing.T) {
+	vals := []string{
+		"",
+		"123",
+		"1 2 3",
+		"1 2 3 ",
+		"  1 2 3",
+		"1  2 3",
+		"1  23",
+		"1  2  3",
+		"1  2  ",
+		" 1  2  ",
+		"12   3",
+		"12   3   1",
+		"12           3     1",
+		"12     3       1abc123",
+	}
+
+	expected := []string{
+		"",
+		"123",
+		"1 2 3",
+		"1 2 3",
+		"1 2 3",
+		"1 2 3",
+		"1 23",
+		"1 2 3",
+		"1 2",
+		"1 2",
+		"12 3",
+		"12 3 1",
+		"12 3 1",
+		"12 3 1abc123",
+	}
+
+	for i := 0; i < len(vals); i++ {
+		r := StripExcessSpaces(vals[i])
+		if e, a := expected[i], r; e != a {
+			t.Errorf("%d, expect %v, got %v", i, e, a)
+		}
+	}
+}
+
+var stripExcessSpaceCases = []string{
+	`AWS4-HMAC-SHA256 Credential=AKIDFAKEIDFAKEID/20160628/us-west-2/s3/aws4_request, SignedHeaders=host;x-amz-date, Signature=1234567890abcdef1234567890abcdef1234567890abcdef`,
+	`123   321   123   321`,
+	`   123   321   123   321   `,
+	`   123    321    123          321   `,
+	"123",
+	"1 2 3",
+	"  1 2 3",
+	"1  2 3",
+	"1  23",
+	"1  2  3",
+	"1  2  ",
+	" 1  2  ",
+	"12   3",
+	"12   3   1",
+	"12           3     1",
+	"12     3       1abc123",
+}
+
+func BenchmarkStripExcessSpaces(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		for _, v := range stripExcessSpaceCases {
+			StripExcessSpaces(v)
+		}
+	}
+}

api/auth/signer/v4asdk2/middleware.go

@@ -0,0 +1,118 @@
+package v4a
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/smithy-go/middleware"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+)
+
+// HTTPSigner is SigV4a HTTP signer implementation
+type HTTPSigner interface {
+	SignHTTP(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optfns ...func(*SignerOptions)) error
+}
+
+// SignHTTPRequestMiddlewareOptions is the middleware options for constructing a SignHTTPRequestMiddleware.
+type SignHTTPRequestMiddlewareOptions struct {
+	Credentials CredentialsProvider
+	Signer      HTTPSigner
+	LogSigning  bool
+}
+
+// SignHTTPRequestMiddleware is a middleware for signing an HTTP request using SigV4a.
+type SignHTTPRequestMiddleware struct {
+	credentials CredentialsProvider
+	signer      HTTPSigner
+	logSigning  bool
+}
+
+// NewSignHTTPRequestMiddleware constructs a SignHTTPRequestMiddleware using the given SignHTTPRequestMiddlewareOptions.
+func NewSignHTTPRequestMiddleware(options SignHTTPRequestMiddlewareOptions) *SignHTTPRequestMiddleware {
+	return &SignHTTPRequestMiddleware{
+		credentials: options.Credentials,
+		signer:      options.Signer,
+		logSigning:  options.LogSigning,
+	}
+}
+
+// ID the middleware identifier.
+func (s *SignHTTPRequestMiddleware) ID() string {
+	return "Signing"
+}
+
+// HandleFinalize signs an HTTP request using SigV4a.
+func (s *SignHTTPRequestMiddleware) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	if !hasCredentialProvider(s.credentials) {
+		return next.HandleFinalize(ctx, in)
+	}
+
+	req, ok := in.Request.(*smithyhttp.Request)
+	if !ok {
+		return out, metadata, fmt.Errorf("unexpected request middleware type %T", in.Request)
+	}
+
+	signingName, signingRegion := awsmiddleware.GetSigningName(ctx), awsmiddleware.GetSigningRegion(ctx)
+	payloadHash := v4.GetPayloadHash(ctx)
+	if len(payloadHash) == 0 {
+		return out, metadata, &SigningError{Err: fmt.Errorf("computed payload hash missing from context")}
+	}
+
+	credentials, err := s.credentials.RetrievePrivateKey(ctx)
+	if err != nil {
+		return out, metadata, &SigningError{Err: fmt.Errorf("failed to retrieve credentials: %w", err)}
+	}
+
+	signerOptions := []func(o *SignerOptions){
+		func(o *SignerOptions) {
+			o.Logger = middleware.GetLogger(ctx)
+			o.LogSigning = s.logSigning
+		},
+	}
+
+	// existing DisableURIPathEscaping is equivalent in purpose
+	// to authentication scheme property DisableDoubleEncoding
+	//disableDoubleEncoding, overridden := internalauth.GetDisableDoubleEncoding(ctx) // 	internalauth "github.com/aws/aws-sdk-go-v2/internal/auth"
+	//if overridden {
+	//	signerOptions = append(signerOptions, func(o *SignerOptions) {
+	//		o.DisableURIPathEscaping = disableDoubleEncoding
+	//	})
+	//}
+
+	err = s.signer.SignHTTP(ctx, credentials, req.Request, payloadHash, signingName, []string{signingRegion}, time.Now().UTC(), signerOptions...)
+	if err != nil {
+		return out, metadata, &SigningError{Err: fmt.Errorf("failed to sign http request, %w", err)}
+	}
+
+	return next.HandleFinalize(ctx, in)
+}
+
+func hasCredentialProvider(p CredentialsProvider) bool {
+	if p == nil {
+		return false
+	}
+
+	return true
+}
+
+// RegisterSigningMiddleware registers the SigV4a signing middleware to the stack. If a signing middleware is already
+// present, this provided middleware will be swapped. Otherwise the middleware will be added at the tail of the
+// finalize step.
+func RegisterSigningMiddleware(stack *middleware.Stack, signingMiddleware *SignHTTPRequestMiddleware) (err error) {
+	const signedID = "Signing"
+	_, present := stack.Finalize.Get(signedID)
+	if present {
+		_, err = stack.Finalize.Swap(signedID, signingMiddleware)
+	} else {
+		err = stack.Finalize.Add(signingMiddleware, middleware.After)
+	}
+	return err
+}

api/auth/signer/v4asdk2/middleware_test.go

@@ -0,0 +1,149 @@
+package v4a
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+	"testing"
+	"time"
+
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/smithy-go/logging"
+	"github.com/aws/smithy-go/middleware"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+)
+
+type stubCredentialsProviderFunc func(context.Context) (Credentials, error)
+
+func (f stubCredentialsProviderFunc) RetrievePrivateKey(ctx context.Context) (Credentials, error) {
+	return f(ctx)
+}
+
+type httpSignerFunc func(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optFns ...func(*SignerOptions)) error
+
+func (f httpSignerFunc) SignHTTP(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optFns ...func(*SignerOptions)) error {
+	return f(ctx, credentials, r, payloadHash, service, regionSet, signingTime, optFns...)
+}
+
+func TestSignHTTPRequestMiddleware(t *testing.T) {
+	cases := map[string]struct {
+		creds       CredentialsProvider
+		hash        string
+		logSigning  bool
+		expectedErr interface{}
+	}{
+		"success": {
+			creds: stubCredentials,
+			hash:  "0123456789abcdef",
+		},
+		"error": {
+			creds: stubCredentialsProviderFunc(func(ctx context.Context) (Credentials, error) {
+				return Credentials{}, fmt.Errorf("credential error")
+			}),
+			hash:        "",
+			expectedErr: &SigningError{},
+		},
+		"nil creds": {
+			creds: nil,
+		},
+		"with log signing": {
+			creds:      stubCredentials,
+			hash:       "0123456789abcdef",
+			logSigning: true,
+		},
+	}
+
+	const (
+		signingName   = "serviceId"
+		signingRegion = "regionName"
+	)
+
+	for name, tt := range cases {
+		t.Run(name, func(t *testing.T) {
+			c := &SignHTTPRequestMiddleware{
+				credentials: tt.creds,
+				signer: httpSignerFunc(
+					func(ctx context.Context,
+						credentials Credentials, r *http.Request, payloadHash string,
+						service string, regionSet []string, signingTime time.Time,
+						optFns ...func(*SignerOptions),
+					) error {
+						var options SignerOptions
+						for _, fn := range optFns {
+							fn(&options)
+						}
+						if options.Logger == nil {
+							t.Errorf("expect logger, got none")
+						}
+						if options.LogSigning {
+							options.Logger.Logf(logging.Debug, t.Name())
+						}
+
+						expectCreds, _ := tt.creds.RetrievePrivateKey(ctx)
+						if diff := cmpDiff(expectCreds, credentials); len(diff) > 0 {
+							t.Error(diff)
+						}
+						if e, a := tt.hash, payloadHash; e != a {
+							t.Errorf("expected %v, got %v", e, a)
+						}
+						if e, a := signingName, service; e != a {
+							t.Errorf("expected %v, got %v", e, a)
+						}
+						if diff := cmpDiff([]string{signingRegion}, regionSet); len(diff) > 0 {
+							t.Error(diff)
+						}
+						return nil
+					}),
+				logSigning: tt.logSigning,
+			}
+
+			next := middleware.FinalizeHandlerFunc(func(ctx context.Context, in middleware.FinalizeInput) (out middleware.FinalizeOutput, metadata middleware.Metadata, err error) {
+				return out, metadata, err
+			})
+
+			ctx := awsmiddleware.SetSigningRegion(
+				awsmiddleware.SetSigningName(context.Background(), signingName),
+				signingRegion)
+
+			var loggerBuf bytes.Buffer
+			logger := logging.NewStandardLogger(&loggerBuf)
+			ctx = middleware.SetLogger(ctx, logger)
+
+			if len(tt.hash) != 0 {
+				ctx = v4.SetPayloadHash(ctx, tt.hash)
+			}
+
+			_, _, err := c.HandleFinalize(ctx, middleware.FinalizeInput{
+				Request: &smithyhttp.Request{Request: &http.Request{}},
+			}, next)
+			if err != nil && tt.expectedErr == nil {
+				t.Errorf("expected no error, got %v", err)
+			} else if err != nil && tt.expectedErr != nil {
+				e, a := tt.expectedErr, err
+				if !errors.As(a, &e) {
+					t.Errorf("expected error type %T, got %T", e, a)
+				}
+			} else if err == nil && tt.expectedErr != nil {
+				t.Errorf("expected error, got nil")
+			}
+
+			if tt.logSigning {
+				if e, a := t.Name(), loggerBuf.String(); !strings.Contains(a, e) {
+					t.Errorf("expect %v logged in %v", e, a)
+				}
+			} else {
+				if loggerBuf.Len() != 0 {
+					t.Errorf("expect no log, got %v", loggerBuf.String())
+				}
+			}
+		})
+	}
+}
+
+var (
+	_ middleware.FinalizeMiddleware = &SignHTTPRequestMiddleware{}
+)

api/auth/signer/v4asdk2/presign_middleware.go

@@ -0,0 +1,116 @@
+package v4a
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/smithy-go/middleware"
+	smithyHTTP "github.com/aws/smithy-go/transport/http"
+)
+
+// HTTPPresigner is an interface to a SigV4a signer that can sign create a
+// presigned URL for a HTTP requests.
+type HTTPPresigner interface {
+	PresignHTTP(
+		ctx context.Context, credentials Credentials, r *http.Request,
+		payloadHash string, service string, regionSet []string, signingTime time.Time,
+		optFns ...func(*SignerOptions),
+	) (url string, signedHeader http.Header, err error)
+}
+
+// PresignHTTPRequestMiddlewareOptions is the options for the PresignHTTPRequestMiddleware middleware.
+type PresignHTTPRequestMiddlewareOptions struct {
+	CredentialsProvider CredentialsProvider
+	Presigner           HTTPPresigner
+	LogSigning          bool
+}
+
+// PresignHTTPRequestMiddleware provides the Finalize middleware for creating a
+// presigned URL for an HTTP request.
+//
+// Will short circuit the middleware stack and not forward onto the next
+// Finalize handler.
+type PresignHTTPRequestMiddleware struct {
+	credentialsProvider CredentialsProvider
+	presigner           HTTPPresigner
+	logSigning          bool
+}
+
+// NewPresignHTTPRequestMiddleware returns a new PresignHTTPRequestMiddleware
+// initialized with the presigner.
+func NewPresignHTTPRequestMiddleware(options PresignHTTPRequestMiddlewareOptions) *PresignHTTPRequestMiddleware {
+	return &PresignHTTPRequestMiddleware{
+		credentialsProvider: options.CredentialsProvider,
+		presigner:           options.Presigner,
+		logSigning:          options.LogSigning,
+	}
+}
+
+// ID provides the middleware ID.
+func (*PresignHTTPRequestMiddleware) ID() string { return "PresignHTTPRequest" }
+
+// HandleFinalize will take the provided input and create a presigned url for
+// the http request using the SigV4 presign authentication scheme.
+func (s *PresignHTTPRequestMiddleware) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	req, ok := in.Request.(*smithyHTTP.Request)
+	if !ok {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("unexpected request middleware type %T", in.Request),
+		}
+	}
+
+	httpReq := req.Build(ctx)
+	if !hasCredentialProvider(s.credentialsProvider) {
+		out.Result = &v4.PresignedHTTPRequest{
+			URL:          httpReq.URL.String(),
+			Method:       httpReq.Method,
+			SignedHeader: http.Header{},
+		}
+
+		return out, metadata, nil
+	}
+
+	signingName := awsmiddleware.GetSigningName(ctx)
+	signingRegion := awsmiddleware.GetSigningRegion(ctx)
+	payloadHash := v4.GetPayloadHash(ctx)
+	if len(payloadHash) == 0 {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("computed payload hash missing from context"),
+		}
+	}
+
+	credentials, err := s.credentialsProvider.RetrievePrivateKey(ctx)
+	if err != nil {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("failed to retrieve credentials: %w", err),
+		}
+	}
+
+	u, h, err := s.presigner.PresignHTTP(ctx, credentials,
+		httpReq, payloadHash, signingName, []string{signingRegion}, time.Now(),
+		func(o *SignerOptions) {
+			o.Logger = middleware.GetLogger(ctx)
+			o.LogSigning = s.logSigning
+		})
+	if err != nil {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("failed to sign http request, %w", err),
+		}
+	}
+
+	out.Result = &v4.PresignedHTTPRequest{
+		URL:          u,
+		Method:       httpReq.Method,
+		SignedHeader: h,
+	}
+
+	return out, metadata, nil
+}

api/auth/signer/v4asdk2/presign_middleware_test.go

@@ -0,0 +1,222 @@
+package v4a
+
+import (
+	"bytes"
+	"context"
+	"net/http"
+	"net/url"
+	"strings"
+	"testing"
+	"time"
+
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/smithy-go/logging"
+	"github.com/aws/smithy-go/middleware"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+)
+
+type httpPresignerFunc func(
+	ctx context.Context, credentials Credentials, r *http.Request,
+	payloadHash string, service string, regionSet []string, signingTime time.Time,
+	optFns ...func(*SignerOptions),
+) (url string, signedHeader http.Header, err error)
+
+func (f httpPresignerFunc) PresignHTTP(
+	ctx context.Context, credentials Credentials, r *http.Request,
+	payloadHash string, service string, regionSet []string, signingTime time.Time,
+	optFns ...func(*SignerOptions),
+) (
+	url string, signedHeader http.Header, err error,
+) {
+	return f(ctx, credentials, r, payloadHash, service, regionSet, signingTime, optFns...)
+}
+
+func TestPresignHTTPRequestMiddleware(t *testing.T) {
+	cases := map[string]struct {
+		Request      *http.Request
+		Creds        CredentialsProvider
+		PayloadHash  string
+		LogSigning   bool
+		ExpectResult *v4.PresignedHTTPRequest
+		ExpectErr    string
+	}{
+		"success": {
+			Request: &http.Request{
+				URL: func() *url.URL {
+					u, _ := url.Parse("https://example.aws/path?query=foo")
+					return u
+				}(),
+				Header: http.Header{},
+			},
+			Creds:       stubCredentials,
+			PayloadHash: "0123456789abcdef",
+			ExpectResult: &v4.PresignedHTTPRequest{
+				URL:          "https://example.aws/path?query=foo",
+				SignedHeader: http.Header{},
+			},
+		},
+		"error": {
+			Request: func() *http.Request {
+				return &http.Request{}
+			}(),
+			Creds:       stubCredentials,
+			PayloadHash: "",
+			ExpectErr:   "failed to sign request",
+		},
+		"anonymous creds": {
+			Request: &http.Request{
+				URL: func() *url.URL {
+					u, _ := url.Parse("https://example.aws/path?query=foo")
+					return u
+				}(),
+				Header: http.Header{},
+			},
+			Creds:       stubCredentials,
+			PayloadHash: "",
+			ExpectErr:   "failed to sign request",
+			ExpectResult: &v4.PresignedHTTPRequest{
+				URL:          "https://example.aws/path?query=foo",
+				SignedHeader: http.Header{},
+			},
+		},
+		"nil creds": {
+			Request: &http.Request{
+				URL: func() *url.URL {
+					u, _ := url.Parse("https://example.aws/path?query=foo")
+					return u
+				}(),
+				Header: http.Header{},
+			},
+			Creds: nil,
+			ExpectResult: &v4.PresignedHTTPRequest{
+				URL:          "https://example.aws/path?query=foo",
+				SignedHeader: http.Header{},
+			},
+		},
+		"with log signing": {
+			Request: &http.Request{
+				URL: func() *url.URL {
+					u, _ := url.Parse("https://example.aws/path?query=foo")
+					return u
+				}(),
+				Header: http.Header{},
+			},
+			Creds:       stubCredentials,
+			PayloadHash: "0123456789abcdef",
+			ExpectResult: &v4.PresignedHTTPRequest{
+				URL:          "https://example.aws/path?query=foo",
+				SignedHeader: http.Header{},
+			},
+
+			LogSigning: true,
+		},
+	}
+
+	const (
+		signingName   = "serviceId"
+		signingRegion = "regionName"
+	)
+
+	for name, tt := range cases {
+		t.Run(name, func(t *testing.T) {
+			m := &PresignHTTPRequestMiddleware{
+				credentialsProvider: tt.Creds,
+
+				presigner: httpPresignerFunc(func(
+					ctx context.Context, credentials Credentials, r *http.Request,
+					payloadHash string, service string, regionSet []string, signingTime time.Time,
+					optFns ...func(*SignerOptions),
+				) (url string, signedHeader http.Header, err error) {
+					var options SignerOptions
+					for _, fn := range optFns {
+						fn(&options)
+					}
+					if options.Logger == nil {
+						t.Errorf("expect logger, got none")
+					}
+					if options.LogSigning {
+						options.Logger.Logf(logging.Debug, t.Name())
+					}
+
+					if !hasCredentialProvider(tt.Creds) {
+						t.Errorf("expect presigner not to be called for not credentials provider")
+					}
+
+					expectCreds, _ := tt.Creds.RetrievePrivateKey(context.Background())
+					if diff := cmpDiff(expectCreds, credentials); len(diff) > 0 {
+						t.Error(diff)
+					}
+					if e, a := tt.PayloadHash, payloadHash; e != a {
+						t.Errorf("expected %v, got %v", e, a)
+					}
+					if e, a := signingName, service; e != a {
+						t.Errorf("expected %v, got %v", e, a)
+					}
+					if diff := cmpDiff([]string{signingRegion}, regionSet); len(diff) > 0 {
+						t.Error(diff)
+					}
+
+					return tt.ExpectResult.URL, tt.ExpectResult.SignedHeader, nil
+				}),
+				logSigning: tt.LogSigning,
+			}
+
+			next := middleware.FinalizeHandlerFunc(
+				func(ctx context.Context, in middleware.FinalizeInput) (
+					out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+				) {
+					t.Errorf("expect next handler not to be called")
+					return out, metadata, err
+				})
+
+			ctx := awsmiddleware.SetSigningRegion(
+				awsmiddleware.SetSigningName(context.Background(), signingName),
+				signingRegion)
+
+			var loggerBuf bytes.Buffer
+			logger := logging.NewStandardLogger(&loggerBuf)
+			ctx = middleware.SetLogger(ctx, logger)
+
+			if len(tt.PayloadHash) != 0 {
+				ctx = v4.SetPayloadHash(ctx, tt.PayloadHash)
+			}
+
+			result, _, err := m.HandleFinalize(ctx, middleware.FinalizeInput{
+				Request: &smithyhttp.Request{
+					Request: tt.Request,
+				},
+			}, next)
+			if len(tt.ExpectErr) != 0 {
+				if err == nil {
+					t.Fatalf("expect error, got none")
+				}
+				if e, a := tt.ExpectErr, err.Error(); !strings.Contains(a, e) {
+					t.Fatalf("expect error to contain %v, got %v", e, a)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("expect no error, got %v", err)
+			}
+
+			if diff := cmpDiff(tt.ExpectResult, result.Result); len(diff) != 0 {
+				t.Errorf("expect result match\n%v", diff)
+			}
+
+			if tt.LogSigning {
+				if e, a := t.Name(), loggerBuf.String(); !strings.Contains(a, e) {
+					t.Errorf("expect %v logged in %v", e, a)
+				}
+			} else {
+				if loggerBuf.Len() != 0 {
+					t.Errorf("expect no log, got %v", loggerBuf.String())
+				}
+			}
+		})
+	}
+}
+
+var (
+	_ middleware.FinalizeMiddleware = &PresignHTTPRequestMiddleware{}
+)

api/auth/signer/v4asdk2/shared_test.go

@@ -0,0 +1,18 @@
+package v4a
+
+import (
+	"bytes"
+	"context"
+	"crypto/ecdsa"
+)
+
+var stubCredentials = stubCredentialsProviderFunc(func(ctx context.Context) (Credentials, error) {
+	stubKey, err := ecdsa.GenerateKey(p256, bytes.NewReader(bytes.Repeat([]byte{1}, 40)))
+	if err != nil {
+		return Credentials{}, err
+	}
+	return Credentials{
+		Context:    "STUB",
+		PrivateKey: stubKey,
+	}, nil
+})

api/auth/signer/v4asdk2/smithy.go

@@ -0,0 +1,85 @@
+package v4a
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/smithy-go"
+	"github.com/aws/smithy-go/auth"
+	"github.com/aws/smithy-go/logging"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+)
+
+// CredentialsAdapter adapts v4a.Credentials to smithy auth.Identity.
+type CredentialsAdapter struct {
+	Credentials Credentials
+}
+
+var _ auth.Identity = (*CredentialsAdapter)(nil)
+
+// Expiration returns the time of expiration for the credentials.
+func (v *CredentialsAdapter) Expiration() time.Time {
+	return v.Credentials.Expires
+}
+
+// CredentialsProviderAdapter adapts v4a.CredentialsProvider to
+// auth.IdentityResolver.
+type CredentialsProviderAdapter struct {
+	Provider CredentialsProvider
+}
+
+var _ (auth.IdentityResolver) = (*CredentialsProviderAdapter)(nil)
+
+// GetIdentity retrieves v4a credentials using the underlying provider.
+func (v *CredentialsProviderAdapter) GetIdentity(ctx context.Context, _ smithy.Properties) (
+	auth.Identity, error,
+) {
+	creds, err := v.Provider.RetrievePrivateKey(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("get credentials: %w", err)
+	}
+
+	return &CredentialsAdapter{Credentials: creds}, nil
+}
+
+// SignerAdapter adapts v4a.HTTPSigner to smithy http.Signer.
+type SignerAdapter struct {
+	Signer     HTTPSigner
+	Logger     logging.Logger
+	LogSigning bool
+}
+
+var _ (smithyhttp.Signer) = (*SignerAdapter)(nil)
+
+// SignRequest signs the request with the provided identity.
+func (v *SignerAdapter) SignRequest(ctx context.Context, r *smithyhttp.Request, identity auth.Identity, props smithy.Properties) error {
+	ca, ok := identity.(*CredentialsAdapter)
+	if !ok {
+		return fmt.Errorf("unexpected identity type: %T", identity)
+	}
+
+	name, ok := smithyhttp.GetSigV4SigningName(&props)
+	if !ok {
+		return fmt.Errorf("sigv4a signing name is required")
+	}
+
+	regions, ok := smithyhttp.GetSigV4ASigningRegions(&props)
+	if !ok {
+		return fmt.Errorf("sigv4a signing region is required")
+	}
+
+	hash := v4.GetPayloadHash(ctx)
+	err := v.Signer.SignHTTP(ctx, ca.Credentials, r.Request, hash, name, regions, time.Now(), func(o *SignerOptions) {
+		o.DisableURIPathEscaping, _ = smithyhttp.GetDisableDoubleEncoding(&props)
+
+		o.Logger = v.Logger
+		o.LogSigning = v.LogSigning
+	})
+	if err != nil {
+		return fmt.Errorf("sign http: %w", err)
+	}
+
+	return nil
+}

api/auth/signer/v4asdk2/stream.go

@@ -0,0 +1,96 @@
+package v4a
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"time"
+
+	signerCrypto "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2/internal/crypto"
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2/internal/v4"
+)
+
+// EventStreamSigner is an AWS EventStream protocol signer.
+type EventStreamSigner interface {
+	GetSignature(ctx context.Context, headers, payload []byte, signingTime time.Time, optFns ...func(*StreamSignerOptions)) ([]byte, error)
+}
+
+// StreamSignerOptions is the configuration options for StreamSigner.
+type StreamSignerOptions struct{}
+
+// StreamSigner implements Signature Version 4 (SigV4) signing of event stream encoded payloads.
+type StreamSigner struct {
+	options StreamSignerOptions
+
+	credentials Credentials
+	service     string
+
+	prevSignature []byte
+}
+
+// NewStreamSigner returns a new AWS EventStream protocol signer.
+func NewStreamSigner(credentials Credentials, service string, seedSignature []byte, optFns ...func(*StreamSignerOptions)) *StreamSigner {
+	o := StreamSignerOptions{}
+
+	for _, fn := range optFns {
+		fn(&o)
+	}
+
+	return &StreamSigner{
+		options:       o,
+		credentials:   credentials,
+		service:       service,
+		prevSignature: seedSignature,
+	}
+}
+
+func (s *StreamSigner) VerifySignature(headers, payload []byte, signingTime time.Time, signature []byte, optFns ...func(*StreamSignerOptions)) error {
+	options := s.options
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	prevSignature := s.prevSignature
+
+	st := v4Internal.NewSigningTime(signingTime)
+
+	scope := buildCredentialScope(st, s.service)
+
+	stringToSign := s.buildEventStreamStringToSign(headers, payload, prevSignature, scope, &st)
+
+	ok, err := signerCrypto.VerifySignature(&s.credentials.PrivateKey.PublicKey, makeHash(sha256.New(), []byte(stringToSign)), signature)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return fmt.Errorf("v4a: invalid signature")
+	}
+
+	s.prevSignature = signature
+
+	return nil
+}
+
+func (s *StreamSigner) buildEventStreamStringToSign(headers, payload, previousSignature []byte, credentialScope string, signingTime *v4Internal.SigningTime) string {
+	hash := sha256.New()
+	return strings.Join([]string{
+		"AWS4-ECDSA-P256-SHA256-PAYLOAD",
+		signingTime.TimeFormat(),
+		credentialScope,
+		hex.EncodeToString(previousSignature),
+		hex.EncodeToString(makeHash(hash, headers)),
+		hex.EncodeToString(makeHash(hash, payload)),
+	}, "\n")
+}
+
+func buildCredentialScope(st v4Internal.SigningTime, service string) string {
+	return strings.Join([]string{
+		st.Format(shortTimeFormat),
+		service,
+		"aws4_request",
+	}, "/")
+
+}

api/auth/signer/v4asdk2/v4a.go

@@ -0,0 +1,577 @@
+package v4a
+
+import (
+	"bytes"
+	"context"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"hash"
+	"math/big"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	signerCrypto "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2/internal/crypto"
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2/internal/v4"
+	"github.com/aws/smithy-go/encoding/httpbinding"
+	"github.com/aws/smithy-go/logging"
+)
+
+const (
+	// AmzRegionSetKey represents the region set header used for sigv4a
+	AmzRegionSetKey     = "X-Amz-Region-Set"
+	amzAlgorithmKey     = v4Internal.AmzAlgorithmKey
+	amzSecurityTokenKey = v4Internal.AmzSecurityTokenKey
+	amzDateKey          = v4Internal.AmzDateKey
+	amzCredentialKey    = v4Internal.AmzCredentialKey
+	amzSignedHeadersKey = v4Internal.AmzSignedHeadersKey
+	authorizationHeader = "Authorization"
+
+	signingAlgorithm = "AWS4-ECDSA-P256-SHA256"
+
+	timeFormat      = "20060102T150405Z"
+	shortTimeFormat = "20060102"
+
+	// EmptyStringSHA256 is a hex encoded SHA-256 hash of an empty string
+	EmptyStringSHA256 = v4Internal.EmptyStringSHA256
+
+	// Version of signing v4a
+	Version = "SigV4A"
+)
+
+var (
+	p256          elliptic.Curve
+	nMinusTwoP256 *big.Int
+
+	one = new(big.Int).SetInt64(1)
+)
+
+func init() {
+	// Ensure the elliptic curve parameters are initialized on package import rather then on first usage
+	p256 = elliptic.P256()
+
+	nMinusTwoP256 = new(big.Int).SetBytes(p256.Params().N.Bytes())
+	nMinusTwoP256 = nMinusTwoP256.Sub(nMinusTwoP256, new(big.Int).SetInt64(2))
+}
+
+// SignerOptions is the SigV4a signing options for constructing a Signer.
+type SignerOptions struct {
+	Logger     logging.Logger
+	LogSigning bool
+
+	// Disables the Signer's moving HTTP header key/value pairs from the HTTP
+	// request header to the request's query string. This is most commonly used
+	// with pre-signed requests preventing headers from being added to the
+	// request's query string.
+	DisableHeaderHoisting bool
+
+	// Disables the automatic escaping of the URI path of the request for the
+	// siganture's canonical string's path. For services that do not need additional
+	// escaping then use this to disable the signer escaping the path.
+	//
+	// S3 is an example of a service that does not need additional escaping.
+	//
+	// http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
+	DisableURIPathEscaping bool
+}
+
+// Signer is a SigV4a HTTP signing implementation
+type Signer struct {
+	options SignerOptions
+}
+
+// NewSigner constructs a SigV4a Signer.
+func NewSigner(optFns ...func(*SignerOptions)) *Signer {
+	options := SignerOptions{}
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	return &Signer{options: options}
+}
+
+// deriveKeyFromAccessKeyPair derives a NIST P-256 PrivateKey from the given
+// IAM AccessKey and SecretKey pair.
+//
+// Based on FIPS.186-4 Appendix B.4.2
+func deriveKeyFromAccessKeyPair(accessKey, secretKey string) (*ecdsa.PrivateKey, error) {
+	params := p256.Params()
+	bitLen := params.BitSize // Testing random candidates does not require an additional 64 bits
+	counter := 0x01
+
+	buffer := make([]byte, 1+len(accessKey)) // 1 byte counter + len(accessKey)
+	kdfContext := bytes.NewBuffer(buffer)
+
+	inputKey := append([]byte("AWS4A"), []byte(secretKey)...)
+
+	d := new(big.Int)
+	for {
+		kdfContext.Reset()
+		kdfContext.WriteString(accessKey)
+		kdfContext.WriteByte(byte(counter))
+
+		key, err := signerCrypto.HMACKeyDerivation(sha256.New, bitLen, inputKey, []byte(signingAlgorithm), kdfContext.Bytes())
+		if err != nil {
+			return nil, err
+		}
+
+		// Check key first before calling SetBytes if key key is in fact a valid candidate.
+		// This ensures the byte slice is the correct length (32-bytes) to compare in constant-time
+		cmp, err := signerCrypto.ConstantTimeByteCompare(key, nMinusTwoP256.Bytes())
+		if err != nil {
+			return nil, err
+		}
+		if cmp == -1 {
+			d.SetBytes(key)
+			break
+		}
+
+		counter++
+		if counter > 0xFF {
+			return nil, fmt.Errorf("exhausted single byte external counter")
+		}
+	}
+	d = d.Add(d, one)
+
+	priv := new(ecdsa.PrivateKey)
+	priv.PublicKey.Curve = p256
+	priv.D = d
+	priv.PublicKey.X, priv.PublicKey.Y = p256.ScalarBaseMult(d.Bytes())
+
+	return priv, nil
+}
+
+type httpSigner struct {
+	Request     *http.Request
+	ServiceName string
+	RegionSet   []string
+	Time        time.Time
+	Credentials Credentials
+	IsPreSign   bool
+
+	Logger logging.Logger
+	Debug  bool
+
+	// PayloadHash is the hex encoded SHA-256 hash of the request payload
+	// If len(PayloadHash) == 0 the signer will attempt to send the request
+	// as an unsigned payload. Note: Unsigned payloads only work for a subset of services.
+	PayloadHash string
+
+	DisableHeaderHoisting  bool
+	DisableURIPathEscaping bool
+}
+
+// SignHTTP takes the provided http.Request, payload hash, service, regionSet, and time and signs using SigV4a.
+// The passed in request will be modified in place.
+func (s *Signer) SignHTTP(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optFns ...func(*SignerOptions)) error {
+	options := s.options
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	signer := &httpSigner{
+		Request:                r,
+		PayloadHash:            payloadHash,
+		ServiceName:            service,
+		RegionSet:              regionSet,
+		Credentials:            credentials,
+		Time:                   signingTime.UTC(),
+		DisableHeaderHoisting:  options.DisableHeaderHoisting,
+		DisableURIPathEscaping: options.DisableURIPathEscaping,
+	}
+
+	signedRequest, err := signer.Build()
+	if err != nil {
+		return err
+	}
+
+	logHTTPSigningInfo(ctx, options, signedRequest)
+
+	return nil
+}
+
+// VerifySignature checks sigv4a.
+func (s *Signer) VerifySignature(credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, signature string, optFns ...func(*SignerOptions)) error {
+	options := s.options
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	signer := &httpSigner{
+		Request:                r,
+		PayloadHash:            payloadHash,
+		ServiceName:            service,
+		RegionSet:              regionSet,
+		Credentials:            credentials,
+		Time:                   signingTime.UTC(),
+		DisableHeaderHoisting:  options.DisableHeaderHoisting,
+		DisableURIPathEscaping: options.DisableURIPathEscaping,
+	}
+
+	signedReq, err := signer.Build()
+	if err != nil {
+		return err
+	}
+
+	logHTTPSigningInfo(context.TODO(), options, signedReq)
+
+	signatureRaw, err := hex.DecodeString(signature)
+	if err != nil {
+		return fmt.Errorf("decode hex signature: %w", err)
+	}
+
+	ok, err := signerCrypto.VerifySignature(&credentials.PrivateKey.PublicKey, makeHash(sha256.New(), []byte(signedReq.StringToSign)), signatureRaw)
+	if err != nil {
+		return err
+	}
+
+	if !ok {
+		return fmt.Errorf("v4a: invalid signature")
+	}
+
+	return nil
+}
+
+// PresignHTTP takes the provided http.Request, payload hash, service, regionSet, and time and presigns using SigV4a
+// Returns the presigned URL along with the headers that were signed with the request.
+//
+// PresignHTTP will not set the expires time of the presigned request
+// automatically. To specify the expire duration for a request add the
+// "X-Amz-Expires" query parameter on the request with the value as the
+// duration in seconds the presigned URL should be considered valid for. This
+// parameter is not used by all AWS services, and is most notable used by
+// Amazon S3 APIs.
+func (s *Signer) PresignHTTP(ctx context.Context, credentials Credentials, r *http.Request, payloadHash string, service string, regionSet []string, signingTime time.Time, optFns ...func(*SignerOptions)) (signedURI string, signedHeaders http.Header, err error) {
+	options := s.options
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	signer := &httpSigner{
+		Request:                r,
+		PayloadHash:            payloadHash,
+		ServiceName:            service,
+		RegionSet:              regionSet,
+		Credentials:            credentials,
+		Time:                   signingTime.UTC(),
+		IsPreSign:              true,
+		DisableHeaderHoisting:  options.DisableHeaderHoisting,
+		DisableURIPathEscaping: options.DisableURIPathEscaping,
+	}
+
+	signedRequest, err := signer.Build()
+	if err != nil {
+		return "", nil, err
+	}
+
+	logHTTPSigningInfo(ctx, options, signedRequest)
+
+	signedHeaders = make(http.Header)
+
+	// For the signed headers we canonicalize the header keys in the returned map.
+	// This avoids situations where can standard library double headers like host header. For example the standard
+	// library will set the Host header, even if it is present in lower-case form.
+	for k, v := range signedRequest.SignedHeaders {
+		key := textproto.CanonicalMIMEHeaderKey(k)
+		signedHeaders[key] = append(signedHeaders[key], v...)
+	}
+
+	return signedRequest.Request.URL.String(), signedHeaders, nil
+}
+
+func (s *httpSigner) setRequiredSigningFields(headers http.Header, query url.Values) {
+	amzDate := s.Time.Format(timeFormat)
+
+	if s.IsPreSign {
+		query.Set(AmzRegionSetKey, strings.Join(s.RegionSet, ","))
+		query.Set(amzDateKey, amzDate)
+		query.Set(amzAlgorithmKey, signingAlgorithm)
+		if len(s.Credentials.SessionToken) > 0 {
+			query.Set(amzSecurityTokenKey, s.Credentials.SessionToken)
+		}
+		return
+	}
+
+	headers.Set(AmzRegionSetKey, strings.Join(s.RegionSet, ","))
+	headers.Set(amzDateKey, amzDate)
+	if len(s.Credentials.SessionToken) > 0 {
+		headers.Set(amzSecurityTokenKey, s.Credentials.SessionToken)
+	}
+}
+
+func (s *httpSigner) Build() (signedRequest, error) {
+	req := s.Request
+
+	query := req.URL.Query()
+	headers := req.Header
+
+	s.setRequiredSigningFields(headers, query)
+
+	// Sort Each Query Key's Values
+	for key := range query {
+		sort.Strings(query[key])
+	}
+
+	v4Internal.SanitizeHostForHeader(req)
+
+	credentialScope := s.buildCredentialScope()
+	credentialStr := s.Credentials.Context + "/" + credentialScope
+	if s.IsPreSign {
+		query.Set(amzCredentialKey, credentialStr)
+	}
+
+	unsignedHeaders := headers
+	if s.IsPreSign && !s.DisableHeaderHoisting {
+		urlValues := url.Values{}
+		urlValues, unsignedHeaders = buildQuery(v4Internal.AllowedQueryHoisting, unsignedHeaders)
+		for k := range urlValues {
+			query[k] = urlValues[k]
+		}
+	}
+
+	host := req.URL.Host
+	if len(req.Host) > 0 {
+		host = req.Host
+	}
+
+	var (
+		signedHeaders      http.Header
+		signedHeadersStr   string
+		canonicalHeaderStr string
+	)
+
+	if s.IsPreSign {
+		signedHeaders, signedHeadersStr, canonicalHeaderStr = s.buildCanonicalHeaders(host, v4Internal.IgnoredPresignedHeaders, unsignedHeaders, s.Request.ContentLength)
+	} else {
+		signedHeaders, signedHeadersStr, canonicalHeaderStr = s.buildCanonicalHeaders(host, v4Internal.IgnoredHeaders, unsignedHeaders, s.Request.ContentLength)
+	}
+
+	if s.IsPreSign {
+		query.Set(amzSignedHeadersKey, signedHeadersStr)
+	}
+
+	rawQuery := strings.Replace(query.Encode(), "+", "%20", -1)
+
+	canonicalURI := v4Internal.GetURIPath(req.URL)
+	if !s.DisableURIPathEscaping {
+		canonicalURI = httpbinding.EscapePath(canonicalURI, false)
+	}
+
+	canonicalString := s.buildCanonicalString(
+		req.Method,
+		canonicalURI,
+		rawQuery,
+		signedHeadersStr,
+		canonicalHeaderStr,
+	)
+
+	strToSign := s.buildStringToSign(credentialScope, canonicalString)
+	signingSignature, err := s.buildSignature(strToSign)
+	if err != nil {
+		return signedRequest{}, err
+	}
+
+	if s.IsPreSign {
+		rawQuery += "&X-Amz-Signature=" + signingSignature
+	} else {
+		headers[authorizationHeader] = append(headers[authorizationHeader][:0], buildAuthorizationHeader(credentialStr, signedHeadersStr, signingSignature))
+	}
+
+	req.URL.RawQuery = rawQuery
+
+	return signedRequest{
+		Request:         req,
+		SignedHeaders:   signedHeaders,
+		CanonicalString: canonicalString,
+		StringToSign:    strToSign,
+		PreSigned:       s.IsPreSign,
+	}, nil
+}
+
+func buildAuthorizationHeader(credentialStr, signedHeadersStr, signingSignature string) string {
+	const credential = "Credential="
+	const signedHeaders = "SignedHeaders="
+	const signature = "Signature="
+	const commaSpace = ", "
+
+	var parts strings.Builder
+	parts.Grow(len(signingAlgorithm) + 1 +
+		len(credential) + len(credentialStr) + len(commaSpace) +
+		len(signedHeaders) + len(signedHeadersStr) + len(commaSpace) +
+		len(signature) + len(signingSignature),
+	)
+	parts.WriteString(signingAlgorithm)
+	parts.WriteRune(' ')
+	parts.WriteString(credential)
+	parts.WriteString(credentialStr)
+	parts.WriteString(commaSpace)
+	parts.WriteString(signedHeaders)
+	parts.WriteString(signedHeadersStr)
+	parts.WriteString(commaSpace)
+	parts.WriteString(signature)
+	parts.WriteString(signingSignature)
+	return parts.String()
+}
+
+func (s *httpSigner) buildCredentialScope() string {
+	return strings.Join([]string{
+		s.Time.Format(shortTimeFormat),
+		s.ServiceName,
+		"aws4_request",
+	}, "/")
+
+}
+
+func buildQuery(r v4Internal.Rule, header http.Header) (url.Values, http.Header) {
+	query := url.Values{}
+	unsignedHeaders := http.Header{}
+	for k, h := range header {
+		if r.IsValid(k) {
+			query[k] = h
+		} else {
+			unsignedHeaders[k] = h
+		}
+	}
+
+	return query, unsignedHeaders
+}
+
+func (s *httpSigner) buildCanonicalHeaders(host string, rule v4Internal.Rule, header http.Header, length int64) (signed http.Header, signedHeaders, canonicalHeadersStr string) {
+	signed = make(http.Header)
+
+	var headers []string
+	const hostHeader = "host"
+	headers = append(headers, hostHeader)
+	signed[hostHeader] = append(signed[hostHeader], host)
+
+	const contentLengthHeader = "content-length"
+	if length > 0 {
+		headers = append(headers, contentLengthHeader)
+		signed[contentLengthHeader] = append(signed[contentLengthHeader], strconv.FormatInt(length, 10))
+	}
+
+	for k, v := range header {
+		if !rule.IsValid(k) {
+			continue // ignored header
+		}
+
+		if strings.EqualFold(k, contentLengthHeader) {
+			// prevent signing already handled content-length header.
+			continue
+		}
+
+		lowerCaseKey := strings.ToLower(k)
+		if _, ok := signed[lowerCaseKey]; ok {
+			// include additional values
+			signed[lowerCaseKey] = append(signed[lowerCaseKey], v...)
+			continue
+		}
+
+		headers = append(headers, lowerCaseKey)
+		signed[lowerCaseKey] = v
+	}
+	sort.Strings(headers)
+
+	signedHeaders = strings.Join(headers, ";")
+
+	var canonicalHeaders strings.Builder
+	n := len(headers)
+	const colon = ':'
+	for i := 0; i < n; i++ {
+		if headers[i] == hostHeader {
+			canonicalHeaders.WriteString(hostHeader)
+			canonicalHeaders.WriteRune(colon)
+			canonicalHeaders.WriteString(v4Internal.StripExcessSpaces(host))
+		} else {
+			canonicalHeaders.WriteString(headers[i])
+			canonicalHeaders.WriteRune(colon)
+			// Trim out leading, trailing, and dedup inner spaces from signed header values.
+			values := signed[headers[i]]
+			for j, v := range values {
+				cleanedValue := strings.TrimSpace(v4Internal.StripExcessSpaces(v))
+				canonicalHeaders.WriteString(cleanedValue)
+				if j < len(values)-1 {
+					canonicalHeaders.WriteRune(',')
+				}
+			}
+		}
+		canonicalHeaders.WriteRune('\n')
+	}
+	canonicalHeadersStr = canonicalHeaders.String()
+
+	return signed, signedHeaders, canonicalHeadersStr
+}
+
+func (s *httpSigner) buildCanonicalString(method, uri, query, signedHeaders, canonicalHeaders string) string {
+	return strings.Join([]string{
+		method,
+		uri,
+		query,
+		canonicalHeaders,
+		signedHeaders,
+		s.PayloadHash,
+	}, "\n")
+}
+
+func (s *httpSigner) buildStringToSign(credentialScope, canonicalRequestString string) string {
+	return strings.Join([]string{
+		signingAlgorithm,
+		s.Time.Format(timeFormat),
+		credentialScope,
+		hex.EncodeToString(makeHash(sha256.New(), []byte(canonicalRequestString))),
+	}, "\n")
+}
+
+func makeHash(hash hash.Hash, b []byte) []byte {
+	hash.Reset()
+	hash.Write(b)
+	return hash.Sum(nil)
+}
+
+func (s *httpSigner) buildSignature(strToSign string) (string, error) {
+	sig, err := s.Credentials.PrivateKey.Sign(rand.Reader, makeHash(sha256.New(), []byte(strToSign)), crypto.SHA256)
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(sig), nil
+}
+
+const logSignInfoMsg = `Request Signature:
+---[ CANONICAL STRING  ]-----------------------------
+%s
+---[ STRING TO SIGN ]--------------------------------
+%s%s
+-----------------------------------------------------`
+const logSignedURLMsg = `
+---[ SIGNED URL ]------------------------------------
+%s`
+
+func logHTTPSigningInfo(ctx context.Context, options SignerOptions, r signedRequest) {
+	if !options.LogSigning {
+		return
+	}
+	signedURLMsg := ""
+	if r.PreSigned {
+		signedURLMsg = fmt.Sprintf(logSignedURLMsg, r.Request.URL.String())
+	}
+	logger := logging.WithContext(ctx, options.Logger)
+	logger.Logf(logging.Debug, logSignInfoMsg, r.CanonicalString, r.StringToSign, signedURLMsg)
+}
+
+type signedRequest struct {
+	Request         *http.Request
+	SignedHeaders   http.Header
+	CanonicalString string
+	StringToSign    string
+	PreSigned       bool
+}

api/auth/signer/v4asdk2/v4a_test.go

@@ -0,0 +1,429 @@
+package v4a
+
+import (
+	"context"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"net/http"
+	"net/url"
+	"reflect"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2/internal/crypto"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/smithy-go/logging"
+)
+
+const (
+	accessKey = "AKISORANDOMAASORANDOM"
+	secretKey = "q+jcrXGc+0zWN6uzclKVhvMmUsIfRPa4rlRandom"
+)
+
+func TestDeriveECDSAKeyPairFromSecret(t *testing.T) {
+	privateKey, err := deriveKeyFromAccessKeyPair(accessKey, secretKey)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedX := func() *big.Int {
+		t.Helper()
+		b, ok := new(big.Int).SetString("15D242CEEBF8D8169FD6A8B5A746C41140414C3B07579038DA06AF89190FFFCB", 16)
+		if !ok {
+			t.Fatalf("failed to parse big integer")
+		}
+		return b
+	}()
+	expectedY := func() *big.Int {
+		t.Helper()
+		b, ok := new(big.Int).SetString("515242CEDD82E94799482E4C0514B505AFCCF2C0C98D6A553BF539F424C5EC0", 16)
+		if !ok {
+			t.Fatalf("failed to parse big integer")
+		}
+		return b
+	}()
+
+	if privateKey.X.Cmp(expectedX) != 0 {
+		t.Errorf("expected % X, got % X", expectedX, privateKey.X)
+	}
+	if privateKey.Y.Cmp(expectedY) != 0 {
+		t.Errorf("expected % X, got % X", expectedY, privateKey.Y)
+	}
+}
+
+func TestSignHTTP(t *testing.T) {
+	req := buildRequest("dynamodb", "us-east-1")
+
+	signer, credProvider := buildSigner(t, true)
+
+	key, err := credProvider.RetrievePrivateKey(context.Background())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	err = signer.SignHTTP(context.Background(), key, req, EmptyStringSHA256, "dynamodb", []string{"us-east-1"}, time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedDate := "19700101T000000Z"
+	expectedAlg := "AWS4-ECDSA-P256-SHA256"
+	expectedCredential := "AKISORANDOMAASORANDOM/19700101/dynamodb/aws4_request"
+	expectedSignedHeaders := "content-length;content-type;host;x-amz-date;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore;x-amz-region-set;x-amz-security-token;x-amz-target"
+	expectedStrToSignHash := "4ba7d0482cf4d5450cefdc067a00de1a4a715e444856fa3e1d85c35fb34d9730"
+
+	q := req.Header
+
+	validateAuthorization(t, q.Get("Authorization"), expectedAlg, expectedCredential, expectedSignedHeaders, expectedStrToSignHash)
+
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+}
+
+func TestSignHTTP_NoSessionToken(t *testing.T) {
+	req := buildRequest("dynamodb", "us-east-1")
+
+	signer, credProvider := buildSigner(t, false)
+
+	key, err := credProvider.RetrievePrivateKey(context.Background())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	err = signer.SignHTTP(context.Background(), key, req, EmptyStringSHA256, "dynamodb", []string{"us-east-1"}, time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedAlg := "AWS4-ECDSA-P256-SHA256"
+	expectedCredential := "AKISORANDOMAASORANDOM/19700101/dynamodb/aws4_request"
+	expectedSignedHeaders := "content-length;content-type;host;x-amz-date;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore;x-amz-region-set;x-amz-target"
+	expectedStrToSignHash := "1aeefb422ae6aa0de7aec829da813e55cff35553cac212dffd5f9474c71e47ee"
+
+	q := req.Header
+
+	validateAuthorization(t, q.Get("Authorization"), expectedAlg, expectedCredential, expectedSignedHeaders, expectedStrToSignHash)
+}
+
+func TestPresignHTTP(t *testing.T) {
+	req := buildRequest("dynamodb", "us-east-1")
+
+	signer, credProvider := buildSigner(t, false)
+
+	key, err := credProvider.RetrievePrivateKey(context.Background())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "18000")
+	req.URL.RawQuery = query.Encode()
+
+	signedURL, _, err := signer.PresignHTTP(context.Background(), key, req, EmptyStringSHA256, "dynamodb", []string{"us-east-1"}, time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedDate := "19700101T000000Z"
+	expectedAlg := "AWS4-ECDSA-P256-SHA256"
+	expectedHeaders := "content-length;content-type;host;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore"
+	expectedCredential := "AKISORANDOMAASORANDOM/19700101/dynamodb/aws4_request"
+	expectedStrToSignHash := "d7ffbd2fab644384c056957e6ac38de4ae68246764b5f5df171b3824153b6397"
+	expectedTarget := "prefix.Operation"
+
+	signedReq, err := url.Parse(signedURL)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	q := signedReq.Query()
+
+	validateSignature(t, expectedStrToSignHash, q.Get("X-Amz-Signature"))
+
+	if e, a := expectedAlg, q.Get("X-Amz-Algorithm"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedCredential, q.Get("X-Amz-Credential"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedHeaders, q.Get("X-Amz-SignedHeaders"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if a := q.Get("X-Amz-Meta-Other-Header"); len(a) != 0 {
+		t.Errorf("expect %v to be empty", a)
+	}
+	if e, a := expectedTarget, q.Get("X-Amz-Target"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := "us-east-1", q.Get("X-Amz-Region-Set"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+}
+
+func TestPresignHTTP_BodyWithArrayRequest(t *testing.T) {
+	req := buildRequest("dynamodb", "us-east-1")
+	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+
+	signer, credProvider := buildSigner(t, true)
+
+	key, err := credProvider.RetrievePrivateKey(context.Background())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "300")
+	req.URL.RawQuery = query.Encode()
+
+	signedURI, _, err := signer.PresignHTTP(context.Background(), key, req, EmptyStringSHA256, "dynamodb", []string{"us-east-1"}, time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	signedReq, err := url.Parse(signedURI)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedAlg := "AWS4-ECDSA-P256-SHA256"
+	expectedDate := "19700101T000000Z"
+	expectedHeaders := "content-length;content-type;host;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore"
+	expectedStrToSignHash := "acff64fd3689be96259d4112c3742ff79f4da0d813bc58a285dc1c4449760bec"
+	expectedCred := "AKISORANDOMAASORANDOM/19700101/dynamodb/aws4_request"
+	expectedTarget := "prefix.Operation"
+
+	q := signedReq.Query()
+
+	validateSignature(t, expectedStrToSignHash, q.Get("X-Amz-Signature"))
+
+	if e, a := expectedAlg, q.Get("X-Amz-Algorithm"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedCred, q.Get("X-Amz-Credential"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedHeaders, q.Get("X-Amz-SignedHeaders"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if a := q.Get("X-Amz-Meta-Other-Header"); len(a) != 0 {
+		t.Errorf("expect %v to be empty, was not", a)
+	}
+	if e, a := expectedTarget, q.Get("X-Amz-Target"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := "us-east-1", q.Get("X-Amz-Region-Set"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+}
+func TestSign_buildCanonicalHeaders(t *testing.T) {
+	serviceName := "mockAPI"
+	region := "mock-region"
+	endpoint := "https://" + serviceName + "." + region + ".amazonaws.com"
+
+	req, err := http.NewRequest("POST", endpoint, nil)
+	if err != nil {
+		t.Fatalf("failed to create request, %v", err)
+	}
+
+	req.Header.Set("FooInnerSpace", "   inner      space    ")
+	req.Header.Set("FooLeadingSpace", "    leading-space")
+	req.Header.Add("FooMultipleSpace", "no-space")
+	req.Header.Add("FooMultipleSpace", "\ttab-space")
+	req.Header.Add("FooMultipleSpace", "trailing-space    ")
+	req.Header.Set("FooNoSpace", "no-space")
+	req.Header.Set("FooTabSpace", "\ttab-space\t")
+	req.Header.Set("FooTrailingSpace", "trailing-space    ")
+	req.Header.Set("FooWrappedSpace", "   wrapped-space    ")
+
+	credProvider := &SymmetricCredentialAdaptor{
+		SymmetricProvider: staticCredentialsProvider{
+			Value: aws.Credentials{
+				AccessKeyID:     accessKey,
+				SecretAccessKey: secretKey,
+			},
+		},
+	}
+	key, err := credProvider.RetrievePrivateKey(context.Background())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	ctx := &httpSigner{
+		Request:     req,
+		ServiceName: serviceName,
+		RegionSet:   []string{region},
+		Credentials: key,
+		Time:        time.Date(2021, 10, 20, 12, 42, 0, 0, time.UTC),
+	}
+
+	build, err := ctx.Build()
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectCanonicalString := strings.Join([]string{
+		`POST`,
+		`/`,
+		``,
+		`fooinnerspace:inner space`,
+		`fooleadingspace:leading-space`,
+		`foomultiplespace:no-space,tab-space,trailing-space`,
+		`foonospace:no-space`,
+		`footabspace:tab-space`,
+		`footrailingspace:trailing-space`,
+		`foowrappedspace:wrapped-space`,
+		`host:mockAPI.mock-region.amazonaws.com`,
+		`x-amz-date:20211020T124200Z`,
+		`x-amz-region-set:mock-region`,
+		``,
+		`fooinnerspace;fooleadingspace;foomultiplespace;foonospace;footabspace;footrailingspace;foowrappedspace;host;x-amz-date;x-amz-region-set`,
+		``,
+	}, "\n")
+	if diff := cmpDiff(expectCanonicalString, build.CanonicalString); diff != "" {
+		t.Errorf("expect match, got\n%s", diff)
+	}
+}
+
+func validateAuthorization(t *testing.T, authorization, expectedAlg, expectedCredential, expectedSignedHeaders, expectedStrToSignHash string) {
+	t.Helper()
+	split := strings.SplitN(authorization, " ", 2)
+
+	if len(split) != 2 {
+		t.Fatal("unexpected authorization header format")
+	}
+
+	if e, a := split[0], expectedAlg; e != a {
+		t.Errorf("expected %v, got %v", e, a)
+	}
+
+	keyValues := strings.Split(split[1], ", ")
+	seen := make(map[string]string)
+
+	for _, kv := range keyValues {
+		idx := strings.Index(kv, "=")
+		if idx == -1 {
+			continue
+		}
+		key, value := kv[:idx], kv[idx+1:]
+		seen[key] = value
+	}
+
+	if a, ok := seen["Credential"]; ok {
+		if expectedCredential != a {
+			t.Errorf("expected credential %v, got %v", expectedCredential, a)
+		}
+	} else {
+		t.Errorf("Credential not found in authorization string")
+	}
+
+	if a, ok := seen["SignedHeaders"]; ok {
+		if expectedSignedHeaders != a {
+			t.Errorf("expected signed headers %v, got %v", expectedSignedHeaders, a)
+		}
+	} else {
+		t.Errorf("SignedHeaders not found in authorization string")
+	}
+
+	if a, ok := seen["Signature"]; ok {
+		validateSignature(t, expectedStrToSignHash, a)
+	} else {
+		t.Errorf("signature not found in authorization string")
+	}
+}
+
+func validateSignature(t *testing.T, expectedHash, signature string) {
+	t.Helper()
+	pair, err := deriveKeyFromAccessKeyPair(accessKey, secretKey)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	hash, _ := hex.DecodeString(expectedHash)
+	sig, _ := hex.DecodeString(signature)
+
+	ok, err := crypto.VerifySignature(&pair.PublicKey, hash, sig)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+	if !ok {
+		t.Errorf("failed to verify signing singature")
+	}
+}
+
+func buildRequest(serviceName, region string) *http.Request {
+	endpoint := "https://" + serviceName + "." + region + ".amazonaws.com"
+	req, _ := http.NewRequest("POST", endpoint, nil)
+	req.URL.Opaque = "//example.org/bucket/key-._~,!@%23$%25^&*()"
+	req.Header.Set("X-Amz-Target", "prefix.Operation")
+	req.Header.Set("Content-Type", "application/x-amz-json-1.0")
+
+	req.Header.Set("Content-Length", strconv.Itoa(1024))
+
+	req.Header.Set("X-Amz-Meta-Other-Header", "some-value=!@#$%^&* (+)")
+	req.Header.Add("X-Amz-Meta-Other-Header_With_Underscore", "some-value=!@#$%^&* (+)")
+	req.Header.Add("X-amz-Meta-Other-Header_With_Underscore", "some-value=!@#$%^&* (+)")
+	return req
+}
+
+func buildSigner(t *testing.T, withToken bool) (*Signer, CredentialsProvider) {
+	creds := aws.Credentials{
+		AccessKeyID:     accessKey,
+		SecretAccessKey: secretKey,
+	}
+
+	if withToken {
+		creds.SessionToken = "TOKEN"
+	}
+
+	return NewSigner(func(options *SignerOptions) {
+			options.Logger = loggerFunc(func(format string, v ...interface{}) {
+				t.Logf(format, v...)
+			})
+		}), &SymmetricCredentialAdaptor{
+			SymmetricProvider: staticCredentialsProvider{
+				Value: creds,
+			},
+		}
+}
+
+type loggerFunc func(format string, v ...interface{})
+
+func (l loggerFunc) Logf(_ logging.Classification, format string, v ...interface{}) {
+	l(format, v...)
+}
+
+type staticCredentialsProvider struct {
+	Value aws.Credentials
+}
+
+func (s staticCredentialsProvider) Retrieve(_ context.Context) (aws.Credentials, error) {
+	v := s.Value
+	if v.AccessKeyID == "" || v.SecretAccessKey == "" {
+		return aws.Credentials{
+			Source: "Source Name",
+		}, fmt.Errorf("static credentials are empty")
+	}
+
+	if len(v.Source) == 0 {
+		v.Source = "Source Name"
+	}
+
+	return v, nil
+}
+
+func cmpDiff(e, a interface{}) string {
+	if !reflect.DeepEqual(e, a) {
+		return fmt.Sprintf("%v != %v", e, a)
+	}
+	return ""
+}

api/auth/signer/v4sdk2/signer/internal/v4/cache.go

@@ -0,0 +1,115 @@
+package v4
+
+import (
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+func lookupKey(service, region string) string {
+	var s strings.Builder
+	s.Grow(len(region) + len(service) + 3)
+	s.WriteString(region)
+	s.WriteRune('/')
+	s.WriteString(service)
+	return s.String()
+}
+
+type derivedKey struct {
+	AccessKey  string
+	Date       time.Time
+	Credential []byte
+}
+
+type derivedKeyCache struct {
+	values map[string]derivedKey
+	mutex  sync.RWMutex
+}
+
+func newDerivedKeyCache() derivedKeyCache {
+	return derivedKeyCache{
+		values: make(map[string]derivedKey),
+	}
+}
+
+func (s *derivedKeyCache) Get(credentials aws.Credentials, service, region string, signingTime SigningTime) []byte {
+	key := lookupKey(service, region)
+	s.mutex.RLock()
+	if cred, ok := s.get(key, credentials, signingTime.Time); ok {
+		s.mutex.RUnlock()
+		return cred
+	}
+	s.mutex.RUnlock()
+
+	s.mutex.Lock()
+	if cred, ok := s.get(key, credentials, signingTime.Time); ok {
+		s.mutex.Unlock()
+		return cred
+	}
+	cred := deriveKey(credentials.SecretAccessKey, service, region, signingTime)
+	entry := derivedKey{
+		AccessKey:  credentials.AccessKeyID,
+		Date:       signingTime.Time,
+		Credential: cred,
+	}
+	s.values[key] = entry
+	s.mutex.Unlock()
+
+	return cred
+}
+
+func (s *derivedKeyCache) get(key string, credentials aws.Credentials, signingTime time.Time) ([]byte, bool) {
+	cacheEntry, ok := s.retrieveFromCache(key)
+	if ok && cacheEntry.AccessKey == credentials.AccessKeyID && isSameDay(signingTime, cacheEntry.Date) {
+		return cacheEntry.Credential, true
+	}
+	return nil, false
+}
+
+func (s *derivedKeyCache) retrieveFromCache(key string) (derivedKey, bool) {
+	if v, ok := s.values[key]; ok {
+		return v, true
+	}
+	return derivedKey{}, false
+}
+
+// SigningKeyDeriver derives a signing key from a set of credentials
+type SigningKeyDeriver struct {
+	cache derivedKeyCache
+}
+
+// NewSigningKeyDeriver returns a new SigningKeyDeriver
+func NewSigningKeyDeriver() *SigningKeyDeriver {
+	return &SigningKeyDeriver{
+		cache: newDerivedKeyCache(),
+	}
+}
+
+// DeriveKey returns a derived signing key from the given credentials to be used with SigV4 signing.
+func (k *SigningKeyDeriver) DeriveKey(credential aws.Credentials, service, region string, signingTime SigningTime) []byte {
+	return k.cache.Get(credential, service, region, signingTime)
+}
+
+func deriveKey(secret, service, region string, t SigningTime) []byte {
+	hmacDate := HMACSHA256([]byte("AWS4"+secret), []byte(t.ShortTimeFormat()))
+	hmacRegion := HMACSHA256(hmacDate, []byte(region))
+	hmacService := HMACSHA256(hmacRegion, []byte(service))
+	return HMACSHA256(hmacService, []byte("aws4_request"))
+}
+
+func isSameDay(x, y time.Time) bool {
+	xYear, xMonth, xDay := x.Date()
+	yYear, yMonth, yDay := y.Date()
+
+	if xYear != yYear {
+		return false
+	}
+
+	if xMonth != yMonth {
+		return false
+	}
+
+	return xDay == yDay
+}

api/auth/signer/v4sdk2/signer/internal/v4/const.go

@@ -0,0 +1,40 @@
+package v4
+
+// Signature Version 4 (SigV4) Constants
+const (
+	// EmptyStringSHA256 is the hex encoded sha256 value of an empty string
+	EmptyStringSHA256 = `e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855`
+
+	// UnsignedPayload indicates that the request payload body is unsigned
+	UnsignedPayload = "UNSIGNED-PAYLOAD"
+
+	// AmzAlgorithmKey indicates the signing algorithm
+	AmzAlgorithmKey = "X-Amz-Algorithm"
+
+	// AmzSecurityTokenKey indicates the security token to be used with temporary credentials
+	AmzSecurityTokenKey = "X-Amz-Security-Token"
+
+	// AmzDateKey is the UTC timestamp for the request in the format YYYYMMDD'T'HHMMSS'Z'
+	AmzDateKey = "X-Amz-Date"
+
+	// AmzCredentialKey is the access key ID and credential scope
+	AmzCredentialKey = "X-Amz-Credential"
+
+	// AmzSignedHeadersKey is the set of headers signed for the request
+	AmzSignedHeadersKey = "X-Amz-SignedHeaders"
+
+	// AmzSignatureKey is the query parameter to store the SigV4 signature
+	AmzSignatureKey = "X-Amz-Signature"
+
+	// TimeFormat is the time format to be used in the X-Amz-Date header or query parameter
+	TimeFormat = "20060102T150405Z"
+
+	// ShortTimeFormat is the shorten time format used in the credential scope
+	ShortTimeFormat = "20060102"
+
+	// ContentSHAKey is the SHA256 of request body
+	ContentSHAKey = "X-Amz-Content-Sha256"
+
+	// StreamingEventsPayload indicates that the request payload body is a signed event stream.
+	StreamingEventsPayload = "STREAMING-AWS4-HMAC-SHA256-EVENTS"
+)

api/auth/signer/v4sdk2/signer/internal/v4/header_rules.go

@@ -0,0 +1,88 @@
+package v4
+
+import (
+	"strings"
+)
+
+// Rules houses a set of Rule needed for validation of a
+// string value
+type Rules []Rule
+
+// Rule interface allows for more flexible rules and just simply
+// checks whether or not a value adheres to that Rule
+type Rule interface {
+	IsValid(value string) bool
+}
+
+// IsValid will iterate through all rules and see if any rules
+// apply to the value and supports nested rules
+func (r Rules) IsValid(value string) bool {
+	for _, rule := range r {
+		if rule.IsValid(value) {
+			return true
+		}
+	}
+	return false
+}
+
+// MapRule generic Rule for maps
+type MapRule map[string]struct{}
+
+// IsValid for the map Rule satisfies whether it exists in the map
+func (m MapRule) IsValid(value string) bool {
+	_, ok := m[value]
+	return ok
+}
+
+// AllowList is a generic Rule for include listing
+type AllowList struct {
+	Rule
+}
+
+// IsValid for AllowList checks if the value is within the AllowList
+func (w AllowList) IsValid(value string) bool {
+	return w.Rule.IsValid(value)
+}
+
+// ExcludeList is a generic Rule for exclude listing
+type ExcludeList struct {
+	Rule
+}
+
+// IsValid for AllowList checks if the value is within the AllowList
+func (b ExcludeList) IsValid(value string) bool {
+	return !b.Rule.IsValid(value)
+}
+
+// Patterns is a list of strings to match against
+type Patterns []string
+
+// IsValid for Patterns checks each pattern and returns if a match has
+// been found
+func (p Patterns) IsValid(value string) bool {
+	for _, pattern := range p {
+		if HasPrefixFold(value, pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+// InclusiveRules rules allow for rules to depend on one another
+type InclusiveRules []Rule
+
+// IsValid will return true if all rules are true
+func (r InclusiveRules) IsValid(value string) bool {
+	for _, rule := range r {
+		if !rule.IsValid(value) {
+			return false
+		}
+	}
+	return true
+}
+
+// HasPrefixFold tests whether the string s begins with prefix, interpreted as UTF-8 strings,
+// under Unicode case-folding.
+func HasPrefixFold(s, prefix string) bool {
+	return len(s) >= len(prefix) && strings.EqualFold(s[0:len(prefix)], prefix)
+}

api/auth/signer/v4sdk2/signer/internal/v4/headers.go

@@ -0,0 +1,84 @@
+package v4
+
+// IgnoredPresignedHeaders is a list of headers that are ignored during signing
+var IgnoredPresignedHeaders = Rules{
+	ExcludeList{
+		MapRule{
+			"Authorization":   struct{}{},
+			"User-Agent":      struct{}{},
+			"X-Amzn-Trace-Id": struct{}{},
+			"Expect":          struct{}{},
+		},
+	},
+}
+
+// IgnoredHeaders is a list of headers that are ignored during signing
+// drop User-Agent header to be compatible with aws sdk java v1.
+var IgnoredHeaders = Rules{
+	ExcludeList{
+		MapRule{
+			"Authorization": struct{}{},
+			//"User-Agent":      struct{}{},
+			"X-Amzn-Trace-Id": struct{}{},
+			"Expect":          struct{}{},
+		},
+	},
+}
+
+// RequiredSignedHeaders is a allow list for Build canonical headers.
+var RequiredSignedHeaders = Rules{
+	AllowList{
+		MapRule{
+			"Cache-Control":                         struct{}{},
+			"Content-Disposition":                   struct{}{},
+			"Content-Encoding":                      struct{}{},
+			"Content-Language":                      struct{}{},
+			"Content-Md5":                           struct{}{},
+			"Content-Type":                          struct{}{},
+			"Expires":                               struct{}{},
+			"If-Match":                              struct{}{},
+			"If-Modified-Since":                     struct{}{},
+			"If-None-Match":                         struct{}{},
+			"If-Unmodified-Since":                   struct{}{},
+			"Range":                                 struct{}{},
+			"X-Amz-Acl":                             struct{}{},
+			"X-Amz-Copy-Source":                     struct{}{},
+			"X-Amz-Copy-Source-If-Match":            struct{}{},
+			"X-Amz-Copy-Source-If-Modified-Since":   struct{}{},
+			"X-Amz-Copy-Source-If-None-Match":       struct{}{},
+			"X-Amz-Copy-Source-If-Unmodified-Since": struct{}{},
+			"X-Amz-Copy-Source-Range":               struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       struct{}{},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   struct{}{},
+			"X-Amz-Expected-Bucket-Owner":                                 struct{}{},
+			"X-Amz-Grant-Full-control":                                    struct{}{},
+			"X-Amz-Grant-Read":                                            struct{}{},
+			"X-Amz-Grant-Read-Acp":                                        struct{}{},
+			"X-Amz-Grant-Write":                                           struct{}{},
+			"X-Amz-Grant-Write-Acp":                                       struct{}{},
+			"X-Amz-Metadata-Directive":                                    struct{}{},
+			"X-Amz-Mfa":                                                   struct{}{},
+			"X-Amz-Request-Payer":                                         struct{}{},
+			"X-Amz-Server-Side-Encryption":                                struct{}{},
+			"X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id":                 struct{}{},
+			"X-Amz-Server-Side-Encryption-Context":                        struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm":             struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Key":                   struct{}{},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":               struct{}{},
+			"X-Amz-Storage-Class":                                         struct{}{},
+			"X-Amz-Website-Redirect-Location":                             struct{}{},
+			"X-Amz-Content-Sha256":                                        struct{}{},
+			"X-Amz-Tagging":                                               struct{}{},
+		},
+	},
+	Patterns{"X-Amz-Object-Lock-"},
+	Patterns{"X-Amz-Meta-"},
+}
+
+// AllowedQueryHoisting is a allowed list for Build query headers. The boolean value
+// represents whether or not it is a pattern.
+var AllowedQueryHoisting = InclusiveRules{
+	ExcludeList{RequiredSignedHeaders},
+	Patterns{"X-Amz-"},
+}

api/auth/signer/v4sdk2/signer/internal/v4/headers_test.go

@@ -0,0 +1,63 @@
+package v4
+
+import "testing"
+
+func TestAllowedQueryHoisting(t *testing.T) {
+	cases := map[string]struct {
+		Header      string
+		ExpectHoist bool
+	}{
+		"object-lock": {
+			Header:      "X-Amz-Object-Lock-Mode",
+			ExpectHoist: false,
+		},
+		"s3 metadata": {
+			Header:      "X-Amz-Meta-SomeName",
+			ExpectHoist: false,
+		},
+		"another header": {
+			Header:      "X-Amz-SomeOtherHeader",
+			ExpectHoist: true,
+		},
+		"non X-AMZ header": {
+			Header:      "X-SomeOtherHeader",
+			ExpectHoist: false,
+		},
+	}
+
+	for name, c := range cases {
+		t.Run(name, func(t *testing.T) {
+			if e, a := c.ExpectHoist, AllowedQueryHoisting.IsValid(c.Header); e != a {
+				t.Errorf("expect hoist %v, was %v", e, a)
+			}
+		})
+	}
+}
+
+func TestIgnoredHeaders(t *testing.T) {
+	cases := map[string]struct {
+		Header        string
+		ExpectIgnored bool
+	}{
+		"expect": {
+			Header:        "Expect",
+			ExpectIgnored: true,
+		},
+		"authorization": {
+			Header:        "Authorization",
+			ExpectIgnored: true,
+		},
+		"X-AMZ header": {
+			Header:        "X-Amz-Content-Sha256",
+			ExpectIgnored: false,
+		},
+	}
+
+	for name, c := range cases {
+		t.Run(name, func(t *testing.T) {
+			if e, a := c.ExpectIgnored, IgnoredHeaders.IsValid(c.Header); e == a {
+				t.Errorf("expect ignored %v, was %v", e, a)
+			}
+		})
+	}
+}

api/auth/signer/v4sdk2/signer/internal/v4/hmac.go

@@ -0,0 +1,13 @@
+package v4
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+)
+
+// HMACSHA256 computes a HMAC-SHA256 of data given the provided key.
+func HMACSHA256(key []byte, data []byte) []byte {
+	hash := hmac.New(sha256.New, key)
+	hash.Write(data)
+	return hash.Sum(nil)
+}

api/auth/signer/v4sdk2/signer/internal/v4/host.go

@@ -0,0 +1,75 @@
+package v4
+
+import (
+	"net/http"
+	"strings"
+)
+
+// SanitizeHostForHeader removes default port from host and updates request.Host
+func SanitizeHostForHeader(r *http.Request) {
+	host := getHost(r)
+	port := portOnly(host)
+	if port != "" && isDefaultPort(r.URL.Scheme, port) {
+		r.Host = stripPort(host)
+	}
+}
+
+// Returns host from request
+func getHost(r *http.Request) string {
+	if r.Host != "" {
+		return r.Host
+	}
+
+	return r.URL.Host
+}
+
+// Hostname returns u.Host, without any port number.
+//
+// If Host is an IPv6 literal with a port number, Hostname returns the
+// IPv6 literal without the square brackets. IPv6 literals may include
+// a zone identifier.
+//
+// Copied from the Go 1.8 standard library (net/url)
+func stripPort(hostport string) string {
+	colon := strings.IndexByte(hostport, ':')
+	if colon == -1 {
+		return hostport
+	}
+	if i := strings.IndexByte(hostport, ']'); i != -1 {
+		return strings.TrimPrefix(hostport[:i], "[")
+	}
+	return hostport[:colon]
+}
+
+// Port returns the port part of u.Host, without the leading colon.
+// If u.Host doesn't contain a port, Port returns an empty string.
+//
+// Copied from the Go 1.8 standard library (net/url)
+func portOnly(hostport string) string {
+	colon := strings.IndexByte(hostport, ':')
+	if colon == -1 {
+		return ""
+	}
+	if i := strings.Index(hostport, "]:"); i != -1 {
+		return hostport[i+len("]:"):]
+	}
+	if strings.Contains(hostport, "]") {
+		return ""
+	}
+	return hostport[colon+len(":"):]
+}
+
+// Returns true if the specified URI is using the standard port
+// (i.e. port 80 for HTTP URIs or 443 for HTTPS URIs)
+func isDefaultPort(scheme, port string) bool {
+	if port == "" {
+		return true
+	}
+
+	lowerCaseScheme := strings.ToLower(scheme)
+	if (lowerCaseScheme == "http" && port == "80") || (lowerCaseScheme == "https" && port == "443") {
+		return true
+	}
+
+	return false
+}

api/auth/signer/v4sdk2/signer/internal/v4/scope.go

@@ -0,0 +1,13 @@
+package v4
+
+import "strings"
+
+// BuildCredentialScope builds the Signature Version 4 (SigV4) signing scope
+func BuildCredentialScope(signingTime SigningTime, region, service string) string {
+	return strings.Join([]string{
+		signingTime.ShortTimeFormat(),
+		region,
+		service,
+		"aws4_request",
+	}, "/")
+}

api/auth/signer/v4sdk2/signer/internal/v4/time.go

@@ -0,0 +1,36 @@
+package v4
+
+import "time"
+
+// SigningTime provides a wrapper around a time.Time which provides cached values for SigV4 signing.
+type SigningTime struct {
+	time.Time
+	timeFormat      string
+	shortTimeFormat string
+}
+
+// NewSigningTime creates a new SigningTime given a time.Time
+func NewSigningTime(t time.Time) SigningTime {
+	return SigningTime{
+		Time: t,
+	}
+}
+
+// TimeFormat provides a time formatted in the X-Amz-Date format.
+func (m *SigningTime) TimeFormat() string {
+	return m.format(&m.timeFormat, TimeFormat)
+}
+
+// ShortTimeFormat provides a time formatted of 20060102.
+func (m *SigningTime) ShortTimeFormat() string {
+	return m.format(&m.shortTimeFormat, ShortTimeFormat)
+}
+
+func (m *SigningTime) format(target *string, format string) string {
+	if len(*target) > 0 {
+		return *target
+	}
+	v := m.Time.Format(format)
+	*target = v
+	return v
+}

api/auth/signer/v4sdk2/signer/internal/v4/util.go

@@ -0,0 +1,80 @@
+package v4
+
+import (
+	"net/url"
+	"strings"
+)
+
+const doubleSpace = "  "
+
+// StripExcessSpaces will rewrite the passed in slice's string values to not
+// contain multiple side-by-side spaces.
+func StripExcessSpaces(str string) string {
+	var j, k, l, m, spaces int
+	// Trim trailing spaces
+	for j = len(str) - 1; j >= 0 && str[j] == ' '; j-- {
+	}
+
+	// Trim leading spaces
+	for k = 0; k < j && str[k] == ' '; k++ {
+	}
+	str = str[k : j+1]
+
+	// Strip multiple spaces.
+	j = strings.Index(str, doubleSpace)
+	if j < 0 {
+		return str
+	}
+
+	buf := []byte(str)
+	for k, m, l = j, j, len(buf); k < l; k++ {
+		if buf[k] == ' ' {
+			if spaces == 0 {
+				// First space.
+				buf[m] = buf[k]
+				m++
+			}
+			spaces++
+		} else {
+			// End of multiple spaces.
+			spaces = 0
+			buf[m] = buf[k]
+			m++
+		}
+	}
+
+	return string(buf[:m])
+}
+
+// GetURIPath returns the escaped URI component from the provided URL.
+func GetURIPath(u *url.URL) string {
+	var uriPath string
+
+	if len(u.Opaque) > 0 {
+		const schemeSep, pathSep, queryStart = "//", "/", "?"
+
+		opaque := u.Opaque
+		// Cut off the query string if present.
+		if idx := strings.Index(opaque, queryStart); idx >= 0 {
+			opaque = opaque[:idx]
+		}
+
+		// Cutout the scheme separator if present.
+		if strings.Index(opaque, schemeSep) == 0 {
+			opaque = opaque[len(schemeSep):]
+		}
+
+		// capture URI path starting with first path separator.
+		if idx := strings.Index(opaque, pathSep); idx >= 0 {
+			uriPath = opaque[idx:]
+		}
+	} else {
+		uriPath = u.EscapedPath()
+	}
+
+	if len(uriPath) == 0 {
+		uriPath = "/"
+	}
+
+	return uriPath
+}

api/auth/signer/v4sdk2/signer/internal/v4/util_test.go

@@ -0,0 +1,158 @@
+package v4
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+)
+
+func lazyURLParse(v string) func() (*url.URL, error) {
+	return func() (*url.URL, error) {
+		return url.Parse(v)
+	}
+}
+
+func TestGetURIPath(t *testing.T) {
+	cases := map[string]struct {
+		getURL func() (*url.URL, error)
+		expect string
+	}{
+		// Cases
+		"with scheme": {
+			getURL: lazyURLParse("https://localhost:9000"),
+			expect: "/",
+		},
+		"no port, with scheme": {
+			getURL: lazyURLParse("https://localhost"),
+			expect: "/",
+		},
+		"without scheme": {
+			getURL: lazyURLParse("localhost:9000"),
+			expect: "/",
+		},
+		"without scheme, with path": {
+			getURL: lazyURLParse("localhost:9000/abc123"),
+			expect: "/abc123",
+		},
+		"without scheme, with separator": {
+			getURL: lazyURLParse("//localhost:9000"),
+			expect: "/",
+		},
+		"no port, without scheme, with separator": {
+			getURL: lazyURLParse("//localhost"),
+			expect: "/",
+		},
+		"without scheme, with separator, with path": {
+			getURL: lazyURLParse("//localhost:9000/abc123"),
+			expect: "/abc123",
+		},
+		"no port, without scheme, with separator, with path": {
+			getURL: lazyURLParse("//localhost/abc123"),
+			expect: "/abc123",
+		},
+		"opaque with query string": {
+			getURL: lazyURLParse("localhost:9000/abc123?efg=456"),
+			expect: "/abc123",
+		},
+		"failing test": {
+			getURL: func() (*url.URL, error) {
+				endpoint := "https://service.region.amazonaws.com"
+				req, _ := http.NewRequest("POST", endpoint, nil)
+				u := req.URL
+
+				u.Opaque = "//example.org/bucket/key-._~,!@#$%^&*()"
+
+				query := u.Query()
+				query.Set("some-query-key", "value")
+				u.RawQuery = query.Encode()
+
+				return u, nil
+			},
+			expect: "/bucket/key-._~,!@#$%^&*()",
+		},
+	}
+
+	for name, c := range cases {
+		t.Run(name, func(t *testing.T) {
+			u, err := c.getURL()
+			if err != nil {
+				t.Fatalf("failed to get URL, %v", err)
+			}
+
+			actual := GetURIPath(u)
+			if e, a := c.expect, actual; e != a {
+				t.Errorf("expect %v path, got %v", e, a)
+			}
+		})
+	}
+}
+
+func TestStripExcessHeaders(t *testing.T) {
+	vals := []string{
+		"",
+		"123",
+		"1 2 3",
+		"1 2 3 ",
+		"  1 2 3",
+		"1  2 3",
+		"1  23",
+		"1  2  3",
+		"1  2  ",
+		" 1  2  ",
+		"12   3",
+		"12   3   1",
+		"12           3     1",
+		"12     3       1abc123",
+	}
+
+	expected := []string{
+		"",
+		"123",
+		"1 2 3",
+		"1 2 3",
+		"1 2 3",
+		"1 2 3",
+		"1 23",
+		"1 2 3",
+		"1 2",
+		"1 2",
+		"12 3",
+		"12 3 1",
+		"12 3 1",
+		"12 3 1abc123",
+	}
+
+	for i := 0; i < len(vals); i++ {
+		r := StripExcessSpaces(vals[i])
+		if e, a := expected[i], r; e != a {
+			t.Errorf("%d, expect %v, got %v", i, e, a)
+		}
+	}
+}
+
+var stripExcessSpaceCases = []string{
+	`AWS4-HMAC-SHA256 Credential=AKIDFAKEIDFAKEID/20160628/us-west-2/s3/aws4_request, SignedHeaders=host;x-amz-date, Signature=1234567890abcdef1234567890abcdef1234567890abcdef`,
+	`123   321   123   321`,
+	`   123   321   123   321   `,
+	`   123    321    123          321   `,
+	"123",
+	"1 2 3",
+	"  1 2 3",
+	"1  2 3",
+	"1  23",
+	"1  2  3",
+	"1  2  ",
+	" 1  2  ",
+	"12   3",
+	"12   3   1",
+	"12           3     1",
+	"12     3       1abc123",
+}
+
+func BenchmarkStripExcessSpaces(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		for _, v := range stripExcessSpaceCases {
+			StripExcessSpaces(v)
+		}
+	}
+}

api/auth/signer/v4sdk2/signer/v4/middleware.go

@@ -0,0 +1,442 @@
+package v4
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4sdk2/signer/internal/v4"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	"github.com/aws/aws-sdk-go-v2/aws/middleware/private/metrics"
+	"github.com/aws/smithy-go/middleware"
+	smithyhttp "github.com/aws/smithy-go/transport/http"
+)
+
+const computePayloadHashMiddlewareID = "ComputePayloadHash"
+
+// HashComputationError indicates an error occurred while computing the signing hash
+type HashComputationError struct {
+	Err error
+}
+
+// Error is the error message
+func (e *HashComputationError) Error() string {
+	return fmt.Sprintf("failed to compute payload hash: %v", e.Err)
+}
+
+// Unwrap returns the underlying error if one is set
+func (e *HashComputationError) Unwrap() error {
+	return e.Err
+}
+
+// SigningError indicates an error condition occurred while performing SigV4 signing
+type SigningError struct {
+	Err error
+}
+
+func (e *SigningError) Error() string {
+	return fmt.Sprintf("failed to sign request: %v", e.Err)
+}
+
+// Unwrap returns the underlying error cause
+func (e *SigningError) Unwrap() error {
+	return e.Err
+}
+
+// UseDynamicPayloadSigningMiddleware swaps the compute payload sha256 middleware with a resolver middleware that
+// switches between unsigned and signed payload based on TLS state for request.
+// This middleware should not be used for AWS APIs that do not support unsigned payload signing auth.
+// By default, SDK uses this middleware for known AWS APIs that support such TLS based auth selection .
+//
+// Usage example -
+// S3 PutObject API allows unsigned payload signing auth usage when TLS is enabled, and uses this middleware to
+// dynamically switch between unsigned and signed payload based on TLS state for request.
+func UseDynamicPayloadSigningMiddleware(stack *middleware.Stack) error {
+	_, err := stack.Finalize.Swap(computePayloadHashMiddlewareID, &dynamicPayloadSigningMiddleware{})
+	return err
+}
+
+// dynamicPayloadSigningMiddleware dynamically resolves the middleware that computes and set payload sha256 middleware.
+type dynamicPayloadSigningMiddleware struct {
+}
+
+// ID returns the resolver identifier
+func (m *dynamicPayloadSigningMiddleware) ID() string {
+	return computePayloadHashMiddlewareID
+}
+
+// HandleFinalize delegates SHA256 computation according to whether the request
+// is TLS-enabled.
+func (m *dynamicPayloadSigningMiddleware) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	req, ok := in.Request.(*smithyhttp.Request)
+	if !ok {
+		return out, metadata, fmt.Errorf("unknown transport type %T", in.Request)
+	}
+
+	if req.IsHTTPS() {
+		return (&UnsignedPayload{}).HandleFinalize(ctx, in, next)
+	}
+	return (&ComputePayloadSHA256{}).HandleFinalize(ctx, in, next)
+}
+
+// UnsignedPayload sets the SigV4 request payload hash to unsigned.
+//
+// Will not set the Unsigned Payload magic SHA value, if a SHA has already been
+// stored in the context. (e.g. application pre-computed SHA256 before making
+// API call).
+//
+// This middleware does not check the X-Amz-Content-Sha256 header, if that
+// header is serialized a middleware must translate it into the context.
+type UnsignedPayload struct{}
+
+// AddUnsignedPayloadMiddleware adds unsignedPayload to the operation
+// middleware stack
+func AddUnsignedPayloadMiddleware(stack *middleware.Stack) error {
+	return stack.Finalize.Insert(&UnsignedPayload{}, "ResolveEndpointV2", middleware.After)
+}
+
+// ID returns the unsignedPayload identifier
+func (m *UnsignedPayload) ID() string {
+	return computePayloadHashMiddlewareID
+}
+
+// HandleFinalize sets the payload hash magic value to the unsigned sentinel.
+func (m *UnsignedPayload) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	if GetPayloadHash(ctx) == "" {
+		ctx = SetPayloadHash(ctx, v4Internal.UnsignedPayload)
+	}
+	return next.HandleFinalize(ctx, in)
+}
+
+// ComputePayloadSHA256 computes SHA256 payload hash to sign.
+//
+// Will not set the Unsigned Payload magic SHA value, if a SHA has already been
+// stored in the context. (e.g. application pre-computed SHA256 before making
+// API call).
+//
+// This middleware does not check the X-Amz-Content-Sha256 header, if that
+// header is serialized a middleware must translate it into the context.
+type ComputePayloadSHA256 struct{}
+
+// AddComputePayloadSHA256Middleware adds computePayloadSHA256 to the
+// operation middleware stack
+func AddComputePayloadSHA256Middleware(stack *middleware.Stack) error {
+	return stack.Finalize.Insert(&ComputePayloadSHA256{}, "ResolveEndpointV2", middleware.After)
+}
+
+// RemoveComputePayloadSHA256Middleware removes computePayloadSHA256 from the
+// operation middleware stack
+func RemoveComputePayloadSHA256Middleware(stack *middleware.Stack) error {
+	_, err := stack.Finalize.Remove(computePayloadHashMiddlewareID)
+	return err
+}
+
+// ID is the middleware name
+func (m *ComputePayloadSHA256) ID() string {
+	return computePayloadHashMiddlewareID
+}
+
+// HandleFinalize computes the payload hash for the request, storing it to the
+// context. This is a no-op if a caller has previously set that value.
+func (m *ComputePayloadSHA256) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	if GetPayloadHash(ctx) != "" {
+		return next.HandleFinalize(ctx, in)
+	}
+
+	req, ok := in.Request.(*smithyhttp.Request)
+	if !ok {
+		return out, metadata, &HashComputationError{
+			Err: fmt.Errorf("unexpected request middleware type %T", in.Request),
+		}
+	}
+
+	hash := sha256.New()
+	if stream := req.GetStream(); stream != nil {
+		_, err = io.Copy(hash, stream)
+		if err != nil {
+			return out, metadata, &HashComputationError{
+				Err: fmt.Errorf("failed to compute payload hash, %w", err),
+			}
+		}
+
+		if err := req.RewindStream(); err != nil {
+			return out, metadata, &HashComputationError{
+				Err: fmt.Errorf("failed to seek body to start, %w", err),
+			}
+		}
+	}
+
+	ctx = SetPayloadHash(ctx, hex.EncodeToString(hash.Sum(nil)))
+
+	return next.HandleFinalize(ctx, in)
+}
+
+// SwapComputePayloadSHA256ForUnsignedPayloadMiddleware replaces the
+// ComputePayloadSHA256 middleware with the UnsignedPayload middleware.
+//
+// Use this to disable computing the Payload SHA256 checksum and instead use
+// UNSIGNED-PAYLOAD for the SHA256 value.
+func SwapComputePayloadSHA256ForUnsignedPayloadMiddleware(stack *middleware.Stack) error {
+	_, err := stack.Finalize.Swap(computePayloadHashMiddlewareID, &UnsignedPayload{})
+	return err
+}
+
+// ContentSHA256Header sets the X-Amz-Content-Sha256 header value to
+// the Payload hash stored in the context.
+type ContentSHA256Header struct{}
+
+// AddContentSHA256HeaderMiddleware adds ContentSHA256Header to the
+// operation middleware stack
+func AddContentSHA256HeaderMiddleware(stack *middleware.Stack) error {
+	return stack.Finalize.Insert(&ContentSHA256Header{}, computePayloadHashMiddlewareID, middleware.After)
+}
+
+// RemoveContentSHA256HeaderMiddleware removes contentSHA256Header middleware
+// from the operation middleware stack
+func RemoveContentSHA256HeaderMiddleware(stack *middleware.Stack) error {
+	_, err := stack.Finalize.Remove((*ContentSHA256Header)(nil).ID())
+	return err
+}
+
+// ID returns the ContentSHA256HeaderMiddleware identifier
+func (m *ContentSHA256Header) ID() string {
+	return "SigV4ContentSHA256Header"
+}
+
+// HandleFinalize sets the X-Amz-Content-Sha256 header value to the Payload hash
+// stored in the context.
+func (m *ContentSHA256Header) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	req, ok := in.Request.(*smithyhttp.Request)
+	if !ok {
+		return out, metadata, &HashComputationError{Err: fmt.Errorf("unexpected request middleware type %T", in.Request)}
+	}
+
+	req.Header.Set(v4Internal.ContentSHAKey, GetPayloadHash(ctx))
+	return next.HandleFinalize(ctx, in)
+}
+
+// SignHTTPRequestMiddlewareOptions is the configuration options for
+// [SignHTTPRequestMiddleware].
+//
+// Deprecated: [SignHTTPRequestMiddleware] is deprecated.
+type SignHTTPRequestMiddlewareOptions struct {
+	CredentialsProvider aws.CredentialsProvider
+	Signer              HTTPSigner
+	LogSigning          bool
+}
+
+// SignHTTPRequestMiddleware is a `FinalizeMiddleware` implementation for SigV4
+// HTTP Signing.
+//
+// Deprecated: AWS service clients no longer use this middleware. Signing as an
+// SDK operation is now performed through an internal per-service middleware
+// which opaquely selects and uses the signer from the resolved auth scheme.
+type SignHTTPRequestMiddleware struct {
+	credentialsProvider aws.CredentialsProvider
+	signer              HTTPSigner
+	logSigning          bool
+}
+
+// NewSignHTTPRequestMiddleware constructs a [SignHTTPRequestMiddleware] using
+// the given [Signer] for signing requests.
+//
+// Deprecated: SignHTTPRequestMiddleware is deprecated.
+func NewSignHTTPRequestMiddleware(options SignHTTPRequestMiddlewareOptions) *SignHTTPRequestMiddleware {
+	return &SignHTTPRequestMiddleware{
+		credentialsProvider: options.CredentialsProvider,
+		signer:              options.Signer,
+		logSigning:          options.LogSigning,
+	}
+}
+
+// ID is the SignHTTPRequestMiddleware identifier.
+//
+// Deprecated: SignHTTPRequestMiddleware is deprecated.
+func (s *SignHTTPRequestMiddleware) ID() string {
+	return "Signing"
+}
+
+// HandleFinalize will take the provided input and sign the request using the
+// SigV4 authentication scheme.
+//
+// Deprecated: SignHTTPRequestMiddleware is deprecated.
+func (s *SignHTTPRequestMiddleware) HandleFinalize(ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	if !haveCredentialProvider(s.credentialsProvider) {
+		return next.HandleFinalize(ctx, in)
+	}
+
+	req, ok := in.Request.(*smithyhttp.Request)
+	if !ok {
+		return out, metadata, &SigningError{Err: fmt.Errorf("unexpected request middleware type %T", in.Request)}
+	}
+
+	signingName, signingRegion := awsmiddleware.GetSigningName(ctx), awsmiddleware.GetSigningRegion(ctx)
+	payloadHash := GetPayloadHash(ctx)
+	if len(payloadHash) == 0 {
+		return out, metadata, &SigningError{Err: fmt.Errorf("computed payload hash missing from context")}
+	}
+
+	mctx := metrics.Context(ctx)
+
+	if mctx != nil {
+		if attempt, err := mctx.Data().LatestAttempt(); err == nil {
+			attempt.CredentialFetchStartTime = time.Now()
+		}
+	}
+
+	credentials, err := s.credentialsProvider.Retrieve(ctx)
+
+	if mctx != nil {
+		if attempt, err := mctx.Data().LatestAttempt(); err == nil {
+			attempt.CredentialFetchEndTime = time.Now()
+		}
+	}
+
+	if err != nil {
+		return out, metadata, &SigningError{Err: fmt.Errorf("failed to retrieve credentials: %w", err)}
+	}
+
+	signerOptions := []func(o *SignerOptions){
+		func(o *SignerOptions) {
+			o.Logger = middleware.GetLogger(ctx)
+			o.LogSigning = s.logSigning
+		},
+	}
+
+	// existing DisableURIPathEscaping is equivalent in purpose
+	// to authentication scheme property DisableDoubleEncoding
+	//disableDoubleEncoding, overridden := internalauth.GetDisableDoubleEncoding(ctx) // internalauth "github.com/aws/aws-sdk-go-v2/internal/auth"
+	//if overridden {
+	//	signerOptions = append(signerOptions, func(o *SignerOptions) {
+	//		o.DisableURIPathEscaping = disableDoubleEncoding
+	//	})
+	//}
+
+	if mctx != nil {
+		if attempt, err := mctx.Data().LatestAttempt(); err == nil {
+			attempt.SignStartTime = time.Now()
+		}
+	}
+
+	err = s.signer.SignHTTP(ctx, credentials, req.Request, payloadHash, signingName, signingRegion, time.Now(), signerOptions...)
+
+	if mctx != nil {
+		if attempt, err := mctx.Data().LatestAttempt(); err == nil {
+			attempt.SignEndTime = time.Now()
+		}
+	}
+
+	if err != nil {
+		return out, metadata, &SigningError{Err: fmt.Errorf("failed to sign http request, %w", err)}
+	}
+
+	ctx = awsmiddleware.SetSigningCredentials(ctx, credentials)
+
+	return next.HandleFinalize(ctx, in)
+}
+
+// StreamingEventsPayload signs input event stream messages.
+type StreamingEventsPayload struct{}
+
+// AddStreamingEventsPayload adds the streamingEventsPayload middleware to the stack.
+func AddStreamingEventsPayload(stack *middleware.Stack) error {
+	return stack.Finalize.Add(&StreamingEventsPayload{}, middleware.Before)
+}
+
+// ID identifies the middleware.
+func (s *StreamingEventsPayload) ID() string {
+	return computePayloadHashMiddlewareID
+}
+
+// HandleFinalize marks the input stream to be signed with SigV4.
+func (s *StreamingEventsPayload) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	contentSHA := GetPayloadHash(ctx)
+	if len(contentSHA) == 0 {
+		contentSHA = v4Internal.StreamingEventsPayload
+	}
+
+	ctx = SetPayloadHash(ctx, contentSHA)
+
+	return next.HandleFinalize(ctx, in)
+}
+
+// GetSignedRequestSignature attempts to extract the signature of the request.
+// Returning an error if the request is unsigned, or unable to extract the
+// signature.
+func GetSignedRequestSignature(r *http.Request) ([]byte, error) {
+	const authHeaderSignatureElem = "Signature="
+
+	if auth := r.Header.Get(authorizationHeader); len(auth) != 0 {
+		ps := strings.Split(auth, ", ")
+		for _, p := range ps {
+			if idx := strings.Index(p, authHeaderSignatureElem); idx >= 0 {
+				sig := p[len(authHeaderSignatureElem):]
+				if len(sig) == 0 {
+					return nil, fmt.Errorf("invalid request signature authorization header")
+				}
+				return hex.DecodeString(sig)
+			}
+		}
+	}
+
+	if sig := r.URL.Query().Get("X-Amz-Signature"); len(sig) != 0 {
+		return hex.DecodeString(sig)
+	}
+
+	return nil, fmt.Errorf("request not signed")
+}
+
+func haveCredentialProvider(p aws.CredentialsProvider) bool {
+	if p == nil {
+		return false
+	}
+
+	return !aws.IsCredentialsProvider(p, (*aws.AnonymousCredentials)(nil))
+}
+
+type payloadHashKey struct{}
+
+// GetPayloadHash retrieves the payload hash to use for signing
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func GetPayloadHash(ctx context.Context) (v string) {
+	v, _ = middleware.GetStackValue(ctx, payloadHashKey{}).(string)
+	return v
+}
+
+// SetPayloadHash sets the payload hash to be used for signing the request
+//
+// Scoped to stack values. Use github.com/aws/smithy-go/middleware#ClearStackValues
+// to clear all stack values.
+func SetPayloadHash(ctx context.Context, hash string) context.Context {
+	return middleware.WithStackValue(ctx, payloadHashKey{}, hash)
+}

api/auth/signer/v4sdk2/signer/v4/presign_middleware.go

@@ -0,0 +1,126 @@
+package v4
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
+	"github.com/aws/smithy-go/middleware"
+	smithyHTTP "github.com/aws/smithy-go/transport/http"
+)
+
+// HTTPPresigner is an interface to a SigV4 signer that can sign create a
+// presigned URL for a HTTP requests.
+type HTTPPresigner interface {
+	PresignHTTP(
+		ctx context.Context, credentials aws.Credentials, r *http.Request,
+		payloadHash string, service string, region string, signingTime time.Time,
+		optFns ...func(*SignerOptions),
+	) (url string, signedHeader http.Header, err error)
+}
+
+// PresignedHTTPRequest provides the URL and signed headers that are included
+// in the presigned URL.
+type PresignedHTTPRequest struct {
+	URL          string
+	Method       string
+	SignedHeader http.Header
+}
+
+// PresignHTTPRequestMiddlewareOptions is the options for the PresignHTTPRequestMiddleware middleware.
+type PresignHTTPRequestMiddlewareOptions struct {
+	CredentialsProvider aws.CredentialsProvider
+	Presigner           HTTPPresigner
+	LogSigning          bool
+}
+
+// PresignHTTPRequestMiddleware provides the Finalize middleware for creating a
+// presigned URL for an HTTP request.
+//
+// Will short circuit the middleware stack and not forward onto the next
+// Finalize handler.
+type PresignHTTPRequestMiddleware struct {
+	credentialsProvider aws.CredentialsProvider
+	presigner           HTTPPresigner
+	logSigning          bool
+}
+
+// NewPresignHTTPRequestMiddleware returns a new PresignHTTPRequestMiddleware
+// initialized with the presigner.
+func NewPresignHTTPRequestMiddleware(options PresignHTTPRequestMiddlewareOptions) *PresignHTTPRequestMiddleware {
+	return &PresignHTTPRequestMiddleware{
+		credentialsProvider: options.CredentialsProvider,
+		presigner:           options.Presigner,
+		logSigning:          options.LogSigning,
+	}
+}
+
+// ID provides the middleware ID.
+func (*PresignHTTPRequestMiddleware) ID() string { return "PresignHTTPRequest" }
+
+// HandleFinalize will take the provided input and create a presigned url for
+// the http request using the SigV4 presign authentication scheme.
+//
+// Since the signed request is not a valid HTTP request
+func (s *PresignHTTPRequestMiddleware) HandleFinalize(
+	ctx context.Context, in middleware.FinalizeInput, next middleware.FinalizeHandler,
+) (
+	out middleware.FinalizeOutput, metadata middleware.Metadata, err error,
+) {
+	req, ok := in.Request.(*smithyHTTP.Request)
+	if !ok {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("unexpected request middleware type %T", in.Request),
+		}
+	}
+
+	httpReq := req.Build(ctx)
+	if !haveCredentialProvider(s.credentialsProvider) {
+		out.Result = &PresignedHTTPRequest{
+			URL:          httpReq.URL.String(),
+			Method:       httpReq.Method,
+			SignedHeader: http.Header{},
+		}
+
+		return out, metadata, nil
+	}
+
+	signingName := awsmiddleware.GetSigningName(ctx)
+	signingRegion := awsmiddleware.GetSigningRegion(ctx)
+	payloadHash := GetPayloadHash(ctx)
+	if len(payloadHash) == 0 {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("computed payload hash missing from context"),
+		}
+	}
+
+	credentials, err := s.credentialsProvider.Retrieve(ctx)
+	if err != nil {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("failed to retrieve credentials: %w", err),
+		}
+	}
+
+	u, h, err := s.presigner.PresignHTTP(ctx, credentials,
+		httpReq, payloadHash, signingName, signingRegion, time.Now(),
+		func(o *SignerOptions) {
+			o.Logger = middleware.GetLogger(ctx)
+			o.LogSigning = s.logSigning
+		})
+	if err != nil {
+		return out, metadata, &SigningError{
+			Err: fmt.Errorf("failed to sign http request, %w", err),
+		}
+	}
+
+	out.Result = &PresignedHTTPRequest{
+		URL:          u,
+		Method:       httpReq.Method,
+		SignedHeader: h,
+	}
+
+	return out, metadata, nil
+}

api/auth/signer/v4sdk2/signer/v4/stream.go

@@ -0,0 +1,87 @@
+package v4
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"strings"
+	"time"
+
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4sdk2/signer/internal/v4"
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+// EventStreamSigner is an AWS EventStream protocol signer.
+type EventStreamSigner interface {
+	GetSignature(ctx context.Context, headers, payload []byte, signingTime time.Time, optFns ...func(*StreamSignerOptions)) ([]byte, error)
+}
+
+// StreamSignerOptions is the configuration options for StreamSigner.
+type StreamSignerOptions struct{}
+
+// StreamSigner implements Signature Version 4 (SigV4) signing of event stream encoded payloads.
+type StreamSigner struct {
+	options StreamSignerOptions
+
+	credentials aws.Credentials
+	service     string
+	region      string
+
+	prevSignature []byte
+
+	signingKeyDeriver *v4Internal.SigningKeyDeriver
+}
+
+// NewStreamSigner returns a new AWS EventStream protocol signer.
+func NewStreamSigner(credentials aws.Credentials, service, region string, seedSignature []byte, optFns ...func(*StreamSignerOptions)) *StreamSigner {
+	o := StreamSignerOptions{}
+
+	for _, fn := range optFns {
+		fn(&o)
+	}
+
+	return &StreamSigner{
+		options:           o,
+		credentials:       credentials,
+		service:           service,
+		region:            region,
+		signingKeyDeriver: v4Internal.NewSigningKeyDeriver(),
+		prevSignature:     seedSignature,
+	}
+}
+
+// GetSignature signs the provided header and payload bytes.
+func (s *StreamSigner) GetSignature(ctx context.Context, headers, payload []byte, signingTime time.Time, optFns ...func(*StreamSignerOptions)) ([]byte, error) {
+	options := s.options
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	prevSignature := s.prevSignature
+
+	st := v4Internal.NewSigningTime(signingTime)
+
+	sigKey := s.signingKeyDeriver.DeriveKey(s.credentials, s.service, s.region, st)
+
+	scope := v4Internal.BuildCredentialScope(st, s.region, s.service)
+
+	stringToSign := s.buildEventStreamStringToSign(headers, payload, prevSignature, scope, &st)
+
+	signature := v4Internal.HMACSHA256(sigKey, []byte(stringToSign))
+	s.prevSignature = signature
+
+	return signature, nil
+}
+
+func (s *StreamSigner) buildEventStreamStringToSign(headers, payload, previousSignature []byte, credentialScope string, signingTime *v4Internal.SigningTime) string {
+	hash := sha256.New()
+	return strings.Join([]string{
+		"AWS4-HMAC-SHA256-PAYLOAD",
+		signingTime.TimeFormat(),
+		credentialScope,
+		hex.EncodeToString(previousSignature),
+		hex.EncodeToString(makeHash(hash, headers)),
+		hex.EncodeToString(makeHash(hash, payload)),
+	}, "\n")
+}

api/auth/signer/v4sdk2/signer/v4/v4.go

@@ -0,0 +1,570 @@
+// Package v4 implements signing for AWS V4 signer
+//
+// Provides request signing for request that need to be signed with
+// AWS V4 Signatures.
+//
+// # Standalone Signer
+//
+// Generally using the signer outside of the SDK should not require any additional
+//
+//	The signer does this by taking advantage of the URL.EscapedPath method. If your request URI requires
+//
+// additional escaping you many need to use the URL.Opaque to define what the raw URI should be sent
+// to the service as.
+//
+// The signer will first check the URL.Opaque field, and use its value if set.
+// The signer does require the URL.Opaque field to be set in the form of:
+//
+//	"//<hostname>/<path>"
+//
+//	// e.g.
+//	"//example.com/some/path"
+//
+// The leading "//" and hostname are required or the URL.Opaque escaping will
+// not work correctly.
+//
+// If URL.Opaque is not set the signer will fallback to the URL.EscapedPath()
+// method and using the returned value.
+//
+// AWS v4 signature validation requires that the canonical string's URI path
+// element must be the URI escaped form of the HTTP request's path.
+// http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
+//
+// The Go HTTP client will perform escaping automatically on the request. Some
+// of these escaping may cause signature validation errors because the HTTP
+// request differs from the URI path or query that the signature was generated.
+// https://golang.org/pkg/net/url/#URL.EscapedPath
+//
+// Because of this, it is recommended that when using the signer outside of the
+// SDK that explicitly escaping the request prior to being signed is preferable,
+// and will help prevent signature validation errors. This can be done by setting
+// the URL.Opaque or URL.RawPath. The SDK will use URL.Opaque first and then
+// call URL.EscapedPath() if Opaque is not set.
+//
+// Test `TestStandaloneSign` provides a complete example of using the signer
+// outside of the SDK and pre-escaping the URI path.
+package v4
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"hash"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4sdk2/signer/internal/v4"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/smithy-go/encoding/httpbinding"
+	"github.com/aws/smithy-go/logging"
+)
+
+const (
+	signingAlgorithm    = "AWS4-HMAC-SHA256"
+	authorizationHeader = "Authorization"
+
+	// Version of signing v4
+	Version = "SigV4"
+)
+
+// HTTPSigner is an interface to a SigV4 signer that can sign HTTP requests
+type HTTPSigner interface {
+	SignHTTP(ctx context.Context, credentials aws.Credentials, r *http.Request, payloadHash string, service string, region string, signingTime time.Time, optFns ...func(*SignerOptions)) error
+}
+
+type keyDerivator interface {
+	DeriveKey(credential aws.Credentials, service, region string, signingTime v4Internal.SigningTime) []byte
+}
+
+// SignerOptions is the SigV4 Signer options.
+type SignerOptions struct {
+	// Disables the Signer's moving HTTP header key/value pairs from the HTTP
+	// request header to the request's query string. This is most commonly used
+	// with pre-signed requests preventing headers from being added to the
+	// request's query string.
+	DisableHeaderHoisting bool
+
+	// Disables the automatic escaping of the URI path of the request for the
+	// siganture's canonical string's path. For services that do not need additional
+	// escaping then use this to disable the signer escaping the path.
+	//
+	// S3 is an example of a service that does not need additional escaping.
+	//
+	// http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
+	DisableURIPathEscaping bool
+
+	// The logger to send log messages to.
+	Logger logging.Logger
+
+	// Enable logging of signed requests.
+	// This will enable logging of the canonical request, the string to sign, and for presigning the subsequent
+	// presigned URL.
+	LogSigning bool
+
+	// Disables setting the session token on the request as part of signing
+	// through X-Amz-Security-Token. This is needed for variations of v4 that
+	// present the token elsewhere.
+	DisableSessionToken bool
+}
+
+// Signer applies AWS v4 signing to given request. Use this to sign requests
+// that need to be signed with AWS V4 Signatures.
+type Signer struct {
+	options      SignerOptions
+	keyDerivator keyDerivator
+}
+
+// NewSigner returns a new SigV4 Signer
+func NewSigner(optFns ...func(signer *SignerOptions)) *Signer {
+	options := SignerOptions{}
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	return &Signer{options: options, keyDerivator: v4Internal.NewSigningKeyDeriver()}
+}
+
+type httpSigner struct {
+	Request      *http.Request
+	ServiceName  string
+	Region       string
+	Time         v4Internal.SigningTime
+	Credentials  aws.Credentials
+	KeyDerivator keyDerivator
+	IsPreSign    bool
+
+	PayloadHash string
+
+	DisableHeaderHoisting  bool
+	DisableURIPathEscaping bool
+	DisableSessionToken    bool
+}
+
+func (s *httpSigner) Build() (signedRequest, error) {
+	req := s.Request
+
+	query := req.URL.Query()
+	headers := req.Header
+
+	s.setRequiredSigningFields(headers, query)
+
+	// Sort Each Query Key's Values
+	for key := range query {
+		sort.Strings(query[key])
+	}
+
+	v4Internal.SanitizeHostForHeader(req)
+
+	credentialScope := s.buildCredentialScope()
+	credentialStr := s.Credentials.AccessKeyID + "/" + credentialScope
+	if s.IsPreSign {
+		query.Set(v4Internal.AmzCredentialKey, credentialStr)
+	}
+
+	unsignedHeaders := headers
+	if s.IsPreSign && !s.DisableHeaderHoisting {
+		var urlValues url.Values
+		urlValues, unsignedHeaders = buildQuery(v4Internal.AllowedQueryHoisting, headers)
+		for k := range urlValues {
+			query[k] = urlValues[k]
+		}
+	}
+
+	host := req.URL.Host
+	if len(req.Host) > 0 {
+		host = req.Host
+	}
+
+	var (
+		signedHeaders      http.Header
+		signedHeadersStr   string
+		canonicalHeaderStr string
+	)
+
+	if s.IsPreSign {
+		signedHeaders, signedHeadersStr, canonicalHeaderStr = s.buildCanonicalHeaders(host, v4Internal.IgnoredPresignedHeaders, unsignedHeaders, s.Request.ContentLength)
+	} else {
+		signedHeaders, signedHeadersStr, canonicalHeaderStr = s.buildCanonicalHeaders(host, v4Internal.IgnoredHeaders, unsignedHeaders, s.Request.ContentLength)
+	}
+
+	if s.IsPreSign {
+		query.Set(v4Internal.AmzSignedHeadersKey, signedHeadersStr)
+	}
+
+	var rawQuery strings.Builder
+	rawQuery.WriteString(strings.Replace(query.Encode(), "+", "%20", -1))
+
+	canonicalURI := v4Internal.GetURIPath(req.URL)
+	if !s.DisableURIPathEscaping {
+		canonicalURI = httpbinding.EscapePath(canonicalURI, false)
+	}
+
+	canonicalString := s.buildCanonicalString(
+		req.Method,
+		canonicalURI,
+		rawQuery.String(),
+		signedHeadersStr,
+		canonicalHeaderStr,
+	)
+
+	strToSign := s.buildStringToSign(credentialScope, canonicalString)
+	signingSignature, err := s.buildSignature(strToSign)
+	if err != nil {
+		return signedRequest{}, err
+	}
+
+	if s.IsPreSign {
+		rawQuery.WriteString("&X-Amz-Signature=")
+		rawQuery.WriteString(signingSignature)
+	} else {
+		headers[authorizationHeader] = append(headers[authorizationHeader][:0], buildAuthorizationHeader(credentialStr, signedHeadersStr, signingSignature))
+	}
+
+	req.URL.RawQuery = rawQuery.String()
+
+	return signedRequest{
+		Request:         req,
+		SignedHeaders:   signedHeaders,
+		CanonicalString: canonicalString,
+		StringToSign:    strToSign,
+		PreSigned:       s.IsPreSign,
+	}, nil
+}
+
+func buildAuthorizationHeader(credentialStr, signedHeadersStr, signingSignature string) string {
+	const credential = "Credential="
+	const signedHeaders = "SignedHeaders="
+	const signature = "Signature="
+	const commaSpace = ", "
+
+	var parts strings.Builder
+	parts.Grow(len(signingAlgorithm) + 1 +
+		len(credential) + len(credentialStr) + 2 +
+		len(signedHeaders) + len(signedHeadersStr) + 2 +
+		len(signature) + len(signingSignature),
+	)
+	parts.WriteString(signingAlgorithm)
+	parts.WriteRune(' ')
+	parts.WriteString(credential)
+	parts.WriteString(credentialStr)
+	parts.WriteString(commaSpace)
+	parts.WriteString(signedHeaders)
+	parts.WriteString(signedHeadersStr)
+	parts.WriteString(commaSpace)
+	parts.WriteString(signature)
+	parts.WriteString(signingSignature)
+	return parts.String()
+}
+
+// SignHTTP signs AWS v4 requests with the provided payload hash, service name, region the
+// request is made to, and time the request is signed at. The signTime allows
+// you to specify that a request is signed for the future, and cannot be
+// used until then.
+//
+// The payloadHash is the hex encoded SHA-256 hash of the request payload, and
+// must be provided. Even if the request has no payload (aka body). If the
+// request has no payload you should use the hex encoded SHA-256 of an empty
+// string as the payloadHash value.
+//
+//	"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+//
+// Some services such as Amazon S3 accept alternative values for the payload
+// hash, such as "UNSIGNED-PAYLOAD" for requests where the body will not be
+// included in the request signature.
+//
+// https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
+//
+// Sign differs from Presign in that it will sign the request using HTTP
+// header values. This type of signing is intended for http.Request values that
+// will not be shared, or are shared in a way the header values on the request
+// will not be lost.
+//
+// The passed in request will be modified in place.
+func (s Signer) SignHTTP(ctx context.Context, credentials aws.Credentials, r *http.Request, payloadHash string, service string, region string, signingTime time.Time, optFns ...func(options *SignerOptions)) error {
+	options := s.options
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	signer := &httpSigner{
+		Request:                r,
+		PayloadHash:            payloadHash,
+		ServiceName:            service,
+		Region:                 region,
+		Credentials:            credentials,
+		Time:                   v4Internal.NewSigningTime(signingTime.UTC()),
+		DisableHeaderHoisting:  options.DisableHeaderHoisting,
+		DisableURIPathEscaping: options.DisableURIPathEscaping,
+		DisableSessionToken:    options.DisableSessionToken,
+		KeyDerivator:           s.keyDerivator,
+	}
+
+	signedRequest, err := signer.Build()
+	if err != nil {
+		return err
+	}
+
+	logSigningInfo(ctx, options, &signedRequest, false)
+
+	return nil
+}
+
+// PresignHTTP signs AWS v4 requests with the payload hash, service name, region
+// the request is made to, and time the request is signed at. The signTime
+// allows you to specify that a request is signed for the future, and cannot
+// be used until then.
+//
+// Returns the signed URL and the map of HTTP headers that were included in the
+// signature or an error if signing the request failed. For presigned requests
+// these headers and their values must be included on the HTTP request when it
+// is made. This is helpful to know what header values need to be shared with
+// the party the presigned request will be distributed to.
+//
+// The payloadHash is the hex encoded SHA-256 hash of the request payload, and
+// must be provided. Even if the request has no payload (aka body). If the
+// request has no payload you should use the hex encoded SHA-256 of an empty
+// string as the payloadHash value.
+//
+//	"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+//
+// Some services such as Amazon S3 accept alternative values for the payload
+// hash, such as "UNSIGNED-PAYLOAD" for requests where the body will not be
+// included in the request signature.
+//
+// https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
+//
+// PresignHTTP differs from SignHTTP in that it will sign the request using
+// query string instead of header values. This allows you to share the
+// Presigned Request's URL with third parties, or distribute it throughout your
+// system with minimal dependencies.
+//
+// PresignHTTP will not set the expires time of the presigned request
+// automatically. To specify the expire duration for a request add the
+// "X-Amz-Expires" query parameter on the request with the value as the
+// duration in seconds the presigned URL should be considered valid for. This
+// parameter is not used by all AWS services, and is most notable used by
+// Amazon S3 APIs.
+//
+//	expires := 20 * time.Minute
+//	query := req.URL.Query()
+//	query.Set("X-Amz-Expires", strconv.FormatInt(int64(expires/time.Second), 10))
+//	req.URL.RawQuery = query.Encode()
+//
+// This method does not modify the provided request.
+func (s *Signer) PresignHTTP(
+	ctx context.Context, credentials aws.Credentials, r *http.Request,
+	payloadHash string, service string, region string, signingTime time.Time,
+	optFns ...func(*SignerOptions),
+) (signedURI string, signedHeaders http.Header, err error) {
+	options := s.options
+
+	for _, fn := range optFns {
+		fn(&options)
+	}
+
+	signer := &httpSigner{
+		Request:                r.Clone(r.Context()),
+		PayloadHash:            payloadHash,
+		ServiceName:            service,
+		Region:                 region,
+		Credentials:            credentials,
+		Time:                   v4Internal.NewSigningTime(signingTime.UTC()),
+		IsPreSign:              true,
+		DisableHeaderHoisting:  options.DisableHeaderHoisting,
+		DisableURIPathEscaping: options.DisableURIPathEscaping,
+		DisableSessionToken:    options.DisableSessionToken,
+		KeyDerivator:           s.keyDerivator,
+	}
+
+	signedRequest, err := signer.Build()
+	if err != nil {
+		return "", nil, err
+	}
+
+	logSigningInfo(ctx, options, &signedRequest, true)
+
+	signedHeaders = make(http.Header)
+
+	// For the signed headers we canonicalize the header keys in the returned map.
+	// This avoids situations where can standard library double headers like host header. For example the standard
+	// library will set the Host header, even if it is present in lower-case form.
+	for k, v := range signedRequest.SignedHeaders {
+		key := textproto.CanonicalMIMEHeaderKey(k)
+		signedHeaders[key] = append(signedHeaders[key], v...)
+	}
+
+	return signedRequest.Request.URL.String(), signedHeaders, nil
+}
+
+func (s *httpSigner) buildCredentialScope() string {
+	return v4Internal.BuildCredentialScope(s.Time, s.Region, s.ServiceName)
+}
+
+func buildQuery(r v4Internal.Rule, header http.Header) (url.Values, http.Header) {
+	query := url.Values{}
+	unsignedHeaders := http.Header{}
+	for k, h := range header {
+		if r.IsValid(k) {
+			query[k] = h
+		} else {
+			unsignedHeaders[k] = h
+		}
+	}
+
+	return query, unsignedHeaders
+}
+
+func (s *httpSigner) buildCanonicalHeaders(host string, rule v4Internal.Rule, header http.Header, length int64) (signed http.Header, signedHeaders, canonicalHeadersStr string) {
+	signed = make(http.Header)
+
+	var headers []string
+	const hostHeader = "host"
+	headers = append(headers, hostHeader)
+	signed[hostHeader] = append(signed[hostHeader], host)
+
+	const contentLengthHeader = "content-length"
+	if length > 0 {
+		headers = append(headers, contentLengthHeader)
+		signed[contentLengthHeader] = append(signed[contentLengthHeader], strconv.FormatInt(length, 10))
+	}
+
+	for k, v := range header {
+		if !rule.IsValid(k) {
+			continue // ignored header
+		}
+		if strings.EqualFold(k, contentLengthHeader) {
+			// prevent signing already handled content-length header.
+			continue
+		}
+
+		lowerCaseKey := strings.ToLower(k)
+		if _, ok := signed[lowerCaseKey]; ok {
+			// include additional values
+			signed[lowerCaseKey] = append(signed[lowerCaseKey], v...)
+			continue
+		}
+
+		headers = append(headers, lowerCaseKey)
+		signed[lowerCaseKey] = v
+	}
+	sort.Strings(headers)
+
+	signedHeaders = strings.Join(headers, ";")
+
+	var canonicalHeaders strings.Builder
+	n := len(headers)
+	const colon = ':'
+	for i := 0; i < n; i++ {
+		if headers[i] == hostHeader {
+			canonicalHeaders.WriteString(hostHeader)
+			canonicalHeaders.WriteRune(colon)
+			canonicalHeaders.WriteString(v4Internal.StripExcessSpaces(host))
+		} else {
+			canonicalHeaders.WriteString(headers[i])
+			canonicalHeaders.WriteRune(colon)
+			// Trim out leading, trailing, and dedup inner spaces from signed header values.
+			values := signed[headers[i]]
+			for j, v := range values {
+				cleanedValue := strings.TrimSpace(v4Internal.StripExcessSpaces(v))
+				canonicalHeaders.WriteString(cleanedValue)
+				if j < len(values)-1 {
+					canonicalHeaders.WriteRune(',')
+				}
+			}
+		}
+		canonicalHeaders.WriteRune('\n')
+	}
+	canonicalHeadersStr = canonicalHeaders.String()
+
+	return signed, signedHeaders, canonicalHeadersStr
+}
+
+func (s *httpSigner) buildCanonicalString(method, uri, query, signedHeaders, canonicalHeaders string) string {
+	return strings.Join([]string{
+		method,
+		uri,
+		query,
+		canonicalHeaders,
+		signedHeaders,
+		s.PayloadHash,
+	}, "\n")
+}
+
+func (s *httpSigner) buildStringToSign(credentialScope, canonicalRequestString string) string {
+	return strings.Join([]string{
+		signingAlgorithm,
+		s.Time.TimeFormat(),
+		credentialScope,
+		hex.EncodeToString(makeHash(sha256.New(), []byte(canonicalRequestString))),
+	}, "\n")
+}
+
+func makeHash(hash hash.Hash, b []byte) []byte {
+	hash.Reset()
+	hash.Write(b)
+	return hash.Sum(nil)
+}
+
+func (s *httpSigner) buildSignature(strToSign string) (string, error) {
+	key := s.KeyDerivator.DeriveKey(s.Credentials, s.ServiceName, s.Region, s.Time)
+	return hex.EncodeToString(v4Internal.HMACSHA256(key, []byte(strToSign))), nil
+}
+
+func (s *httpSigner) setRequiredSigningFields(headers http.Header, query url.Values) {
+	amzDate := s.Time.TimeFormat()
+
+	if s.IsPreSign {
+		query.Set(v4Internal.AmzAlgorithmKey, signingAlgorithm)
+		sessionToken := s.Credentials.SessionToken
+		if !s.DisableSessionToken && len(sessionToken) > 0 {
+			query.Set("X-Amz-Security-Token", sessionToken)
+		}
+
+		query.Set(v4Internal.AmzDateKey, amzDate)
+		return
+	}
+
+	headers[v4Internal.AmzDateKey] = append(headers[v4Internal.AmzDateKey][:0], amzDate)
+
+	if !s.DisableSessionToken && len(s.Credentials.SessionToken) > 0 {
+		headers[v4Internal.AmzSecurityTokenKey] = append(headers[v4Internal.AmzSecurityTokenKey][:0], s.Credentials.SessionToken)
+	}
+}
+
+func logSigningInfo(ctx context.Context, options SignerOptions, request *signedRequest, isPresign bool) {
+	if !options.LogSigning {
+		return
+	}
+	signedURLMsg := ""
+	if isPresign {
+		signedURLMsg = fmt.Sprintf(logSignedURLMsg, request.Request.URL.String())
+	}
+	logger := logging.WithContext(ctx, options.Logger)
+	logger.Logf(logging.Debug, logSignInfoMsg, request.CanonicalString, request.StringToSign, signedURLMsg)
+}
+
+type signedRequest struct {
+	Request         *http.Request
+	SignedHeaders   http.Header
+	CanonicalString string
+	StringToSign    string
+	PreSigned       bool
+}
+
+const logSignInfoMsg = `Request Signature:
+---[ CANONICAL STRING  ]-----------------------------
+%s
+---[ STRING TO SIGN ]--------------------------------
+%s%s
+-----------------------------------------------------`
+const logSignedURLMsg = `
+---[ SIGNED URL ]------------------------------------
+%s`

api/auth/signer/v4sdk2/signer/v4/v4_test.go

@@ -0,0 +1,363 @@
+package v4
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+
+	v4Internal "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4sdk2/signer/internal/v4"
+	"github.com/aws/aws-sdk-go-v2/aws"
+)
+
+var testCredentials = aws.Credentials{AccessKeyID: "AKID", SecretAccessKey: "SECRET", SessionToken: "SESSION"}
+
+func buildRequest(serviceName, region, body string) (*http.Request, string) {
+	reader := strings.NewReader(body)
+	return buildRequestWithBodyReader(serviceName, region, reader)
+}
+
+func buildRequestWithBodyReader(serviceName, region string, body io.Reader) (*http.Request, string) {
+	var bodyLen int
+
+	type lenner interface {
+		Len() int
+	}
+	if lr, ok := body.(lenner); ok {
+		bodyLen = lr.Len()
+	}
+
+	endpoint := "https://" + serviceName + "." + region + ".amazonaws.com"
+	req, _ := http.NewRequest("POST", endpoint, body)
+	req.URL.Opaque = "//example.org/bucket/key-._~,!@#$%^&*()"
+	req.Header.Set("X-Amz-Target", "prefix.Operation")
+	req.Header.Set("Content-Type", "application/x-amz-json-1.0")
+
+	if bodyLen > 0 {
+		req.ContentLength = int64(bodyLen)
+	}
+
+	req.Header.Set("X-Amz-Meta-Other-Header", "some-value=!@#$%^&* (+)")
+	req.Header.Add("X-Amz-Meta-Other-Header_With_Underscore", "some-value=!@#$%^&* (+)")
+	req.Header.Add("X-amz-Meta-Other-Header_With_Underscore", "some-value=!@#$%^&* (+)")
+
+	h := sha256.New()
+	_, _ = io.Copy(h, body)
+	payloadHash := hex.EncodeToString(h.Sum(nil))
+
+	return req, payloadHash
+}
+
+func TestPresignRequest(t *testing.T) {
+	req, body := buildRequest("dynamodb", "us-east-1", "{}")
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "300")
+	req.URL.RawQuery = query.Encode()
+
+	signer := NewSigner()
+	signed, headers, err := signer.PresignHTTP(context.Background(), testCredentials, req, body, "dynamodb", "us-east-1", time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectedDate := "19700101T000000Z"
+	expectedHeaders := "content-length;content-type;host;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore"
+	expectedSig := "122f0b9e091e4ba84286097e2b3404a1f1f4c4aad479adda95b7dff0ccbe5581"
+	expectedCred := "AKID/19700101/us-east-1/dynamodb/aws4_request"
+	expectedTarget := "prefix.Operation"
+
+	q, err := url.ParseQuery(signed[strings.Index(signed, "?"):])
+	if err != nil {
+		t.Errorf("expect no error, got %v", err)
+	}
+
+	if e, a := expectedSig, q.Get("X-Amz-Signature"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedCred, q.Get("X-Amz-Credential"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedHeaders, q.Get("X-Amz-SignedHeaders"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if a := q.Get("X-Amz-Meta-Other-Header"); len(a) != 0 {
+		t.Errorf("expect %v to be empty", a)
+	}
+	if e, a := expectedTarget, q.Get("X-Amz-Target"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+
+	for _, h := range strings.Split(expectedHeaders, ";") {
+		v := headers.Get(h)
+		if len(v) == 0 {
+			t.Errorf("expect %v, to be present in header map", h)
+		}
+	}
+}
+
+func TestPresignBodyWithArrayRequest(t *testing.T) {
+	req, body := buildRequest("dynamodb", "us-east-1", "{}")
+	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "300")
+	req.URL.RawQuery = query.Encode()
+
+	signer := NewSigner()
+	signed, headers, err := signer.PresignHTTP(context.Background(), testCredentials, req, body, "dynamodb", "us-east-1", time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	q, err := url.ParseQuery(signed[strings.Index(signed, "?"):])
+	if err != nil {
+		t.Errorf("expect no error, got %v", err)
+	}
+
+	expectedDate := "19700101T000000Z"
+	expectedHeaders := "content-length;content-type;host;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore"
+	expectedSig := "e3ac55addee8711b76c6d608d762cff285fe8b627a057f8b5ec9268cf82c08b1"
+	expectedCred := "AKID/19700101/us-east-1/dynamodb/aws4_request"
+	expectedTarget := "prefix.Operation"
+
+	if e, a := expectedSig, q.Get("X-Amz-Signature"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedCred, q.Get("X-Amz-Credential"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedHeaders, q.Get("X-Amz-SignedHeaders"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if a := q.Get("X-Amz-Meta-Other-Header"); len(a) != 0 {
+		t.Errorf("expect %v to be empty, was not", a)
+	}
+	if e, a := expectedTarget, q.Get("X-Amz-Target"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+
+	for _, h := range strings.Split(expectedHeaders, ";") {
+		v := headers.Get(h)
+		if len(v) == 0 {
+			t.Errorf("expect %v, to be present in header map", h)
+		}
+	}
+}
+
+func TestSignRequest(t *testing.T) {
+	req, body := buildRequest("dynamodb", "us-east-1", "{}")
+	signer := NewSigner()
+	err := signer.SignHTTP(context.Background(), testCredentials, req, body, "dynamodb", "us-east-1", time.Unix(0, 0))
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	expectedDate := "19700101T000000Z"
+	expectedSig := "AWS4-HMAC-SHA256 Credential=AKID/19700101/us-east-1/dynamodb/aws4_request, SignedHeaders=content-length;content-type;host;x-amz-date;x-amz-meta-other-header;x-amz-meta-other-header_with_underscore;x-amz-security-token;x-amz-target, Signature=a518299330494908a70222cec6899f6f32f297f8595f6df1776d998936652ad9"
+
+	q := req.Header
+	if e, a := expectedSig, q.Get("Authorization"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+	if e, a := expectedDate, q.Get("X-Amz-Date"); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+}
+
+func TestBuildCanonicalRequest(t *testing.T) {
+	req, _ := buildRequest("dynamodb", "us-east-1", "{}")
+	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+
+	ctx := &httpSigner{
+		ServiceName:  "dynamodb",
+		Region:       "us-east-1",
+		Request:      req,
+		Time:         v4Internal.NewSigningTime(time.Now()),
+		KeyDerivator: v4Internal.NewSigningKeyDeriver(),
+	}
+
+	build, err := ctx.Build()
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expected := "https://example.org/bucket/key-._~,!@#$%^&*()?Foo=a&Foo=m&Foo=o&Foo=z"
+	if e, a := expected, build.Request.URL.String(); e != a {
+		t.Errorf("expect %v, got %v", e, a)
+	}
+}
+
+func TestSigner_SignHTTP_NoReplaceRequestBody(t *testing.T) {
+	req, bodyHash := buildRequest("dynamodb", "us-east-1", "{}")
+	req.Body = ioutil.NopCloser(bytes.NewReader([]byte{}))
+
+	s := NewSigner()
+
+	origBody := req.Body
+
+	err := s.SignHTTP(context.Background(), testCredentials, req, bodyHash, "dynamodb", "us-east-1", time.Now())
+	if err != nil {
+		t.Fatalf("expect no error, got %v", err)
+	}
+
+	if req.Body != origBody {
+		t.Errorf("expect request body to not be chagned")
+	}
+}
+
+func TestRequestHost(t *testing.T) {
+	req, _ := buildRequest("dynamodb", "us-east-1", "{}")
+	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+	req.Host = "myhost"
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "5")
+	req.URL.RawQuery = query.Encode()
+
+	ctx := &httpSigner{
+		ServiceName:  "dynamodb",
+		Region:       "us-east-1",
+		Request:      req,
+		Time:         v4Internal.NewSigningTime(time.Now()),
+		KeyDerivator: v4Internal.NewSigningKeyDeriver(),
+	}
+
+	build, err := ctx.Build()
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if !strings.Contains(build.CanonicalString, "host:"+req.Host) {
+		t.Errorf("canonical host header invalid")
+	}
+}
+
+func TestSign_buildCanonicalHeadersContentLengthPresent(t *testing.T) {
+	body := `{"description": "this is a test"}`
+	req, _ := buildRequest("dynamodb", "us-east-1", body)
+	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+	req.Host = "myhost"
+
+	contentLength := fmt.Sprintf("%d", len([]byte(body)))
+	req.Header.Add("Content-Length", contentLength)
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "5")
+	req.URL.RawQuery = query.Encode()
+
+	ctx := &httpSigner{
+		ServiceName:  "dynamodb",
+		Region:       "us-east-1",
+		Request:      req,
+		Time:         v4Internal.NewSigningTime(time.Now()),
+		KeyDerivator: v4Internal.NewSigningKeyDeriver(),
+	}
+
+	build, err := ctx.Build()
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	if !strings.Contains(build.CanonicalString, "content-length:"+contentLength+"\n") {
+		t.Errorf("canonical header content-length invalid")
+	}
+}
+
+func TestSign_buildCanonicalHeaders(t *testing.T) {
+	serviceName := "mockAPI"
+	region := "mock-region"
+	endpoint := "https://" + serviceName + "." + region + ".amazonaws.com"
+
+	req, err := http.NewRequest("POST", endpoint, nil)
+	if err != nil {
+		t.Fatalf("failed to create request, %v", err)
+	}
+
+	req.Header.Set("FooInnerSpace", "   inner      space    ")
+	req.Header.Set("FooLeadingSpace", "    leading-space")
+	req.Header.Add("FooMultipleSpace", "no-space")
+	req.Header.Add("FooMultipleSpace", "\ttab-space")
+	req.Header.Add("FooMultipleSpace", "trailing-space    ")
+	req.Header.Set("FooNoSpace", "no-space")
+	req.Header.Set("FooTabSpace", "\ttab-space\t")
+	req.Header.Set("FooTrailingSpace", "trailing-space    ")
+	req.Header.Set("FooWrappedSpace", "   wrapped-space    ")
+
+	ctx := &httpSigner{
+		ServiceName:  serviceName,
+		Region:       region,
+		Request:      req,
+		Time:         v4Internal.NewSigningTime(time.Date(2021, 10, 20, 12, 42, 0, 0, time.UTC)),
+		KeyDerivator: v4Internal.NewSigningKeyDeriver(),
+	}
+
+	build, err := ctx.Build()
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+
+	expectCanonicalString := strings.Join([]string{
+		`POST`,
+		`/`,
+		``,
+		`fooinnerspace:inner space`,
+		`fooleadingspace:leading-space`,
+		`foomultiplespace:no-space,tab-space,trailing-space`,
+		`foonospace:no-space`,
+		`footabspace:tab-space`,
+		`footrailingspace:trailing-space`,
+		`foowrappedspace:wrapped-space`,
+		`host:mockAPI.mock-region.amazonaws.com`,
+		`x-amz-date:20211020T124200Z`,
+		``,
+		`fooinnerspace;fooleadingspace;foomultiplespace;foonospace;footabspace;footrailingspace;foowrappedspace;host;x-amz-date`,
+		``,
+	}, "\n")
+	if diff := cmpDiff(expectCanonicalString, build.CanonicalString); diff != "" {
+		t.Errorf("expect match, got\n%s", diff)
+	}
+}
+
+func BenchmarkPresignRequest(b *testing.B) {
+	signer := NewSigner()
+	req, bodyHash := buildRequest("dynamodb", "us-east-1", "{}")
+
+	query := req.URL.Query()
+	query.Set("X-Amz-Expires", "5")
+	req.URL.RawQuery = query.Encode()
+
+	for i := 0; i < b.N; i++ {
+		signer.PresignHTTP(context.Background(), testCredentials, req, bodyHash, "dynamodb", "us-east-1", time.Now())
+	}
+}
+
+func BenchmarkSignRequest(b *testing.B) {
+	signer := NewSigner()
+	req, bodyHash := buildRequest("dynamodb", "us-east-1", "{}")
+	for i := 0; i < b.N; i++ {
+		signer.SignHTTP(context.Background(), testCredentials, req, bodyHash, "dynamodb", "us-east-1", time.Now())
+	}
+}
+
+func cmpDiff(e, a interface{}) string {
+	if !reflect.DeepEqual(e, a) {
+		return fmt.Sprintf("%v != %v", e, a)
+	}
+	return ""
+}

api/handler/put.go

@@ -312,7 +312,8 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *handler) getBodyReader(r *http.Request) (io.ReadCloser, error) {
-	if !api.IsSignedStreamingV4(r) {
+	shaType, streaming := api.IsSignedStreamingV4(r)
+	if !streaming {
 		return r.Body, nil
 	}
 
@@ -345,7 +346,16 @@ func (h *handler) getBodyReader(r *http.Request) (io.ReadCloser, error) {
 		return nil, fmt.Errorf("%w: parse decoded content length: %s", apierr.GetAPIError(apierr.ErrMissingContentLength), err.Error())
 	}
 
-	chunkReader, err := newSignV4ChunkedReader(r)
+	var (
+		err         error
+		chunkReader io.ReadCloser
+	)
+	if shaType == api.StreamingContentV4aSHA256 {
+		chunkReader, err = newSignV4aChunkedReader(r)
+	} else {
+		chunkReader, err = newSignV4ChunkedReader(r)
+	}
+
 	if err != nil {
 		return nil, fmt.Errorf("initialize chunk reader: %w", err)
 	}

api/handler/s3v4aReader.go

@@ -0,0 +1,209 @@
+package handler
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	v4a "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth/signer/v4asdk2"
+	errs "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	credentialsv2 "github.com/aws/aws-sdk-go-v2/credentials"
+)
+
+type (
+	s3v4aChunkReader struct {
+		reader       *bufio.Reader
+		streamSigner *v4a.StreamSigner
+
+		requestTime time.Time
+		buffer      []byte
+		offset      int
+		err         error
+	}
+)
+
+func (c *s3v4aChunkReader) Close() (err error) {
+	return nil
+}
+
+func (c *s3v4aChunkReader) Read(buf []byte) (num int, err error) {
+	if c.offset > 0 {
+		num = copy(buf, c.buffer[c.offset:])
+		if num == len(buf) {
+			c.offset += num
+			return num, nil
+		}
+		c.offset = 0
+		buf = buf[num:]
+	}
+
+	var size int
+	for {
+		b, err := c.reader.ReadByte()
+		if err != nil {
+			return c.handleErr(num, err)
+		}
+		if b == ';' { // separating character
+			break
+		}
+
+		// Manually deserialize the size since AWS specified
+		// the chunk size to be of variable width. In particular,
+		// a size of 16 is encoded as `10` while a size of 64 KB
+		// is `10000`.
+		switch {
+		case b >= '0' && b <= '9':
+			size = size<<4 | int(b-'0')
+		case b >= 'a' && b <= 'f':
+			size = size<<4 | int(b-('a'-10))
+		case b >= 'A' && b <= 'F':
+			size = size<<4 | int(b-('A'-10))
+		default:
+			c.err = errMalformedChunkedEncoding
+			return num, c.err
+		}
+		if size > maxChunkSize {
+			c.err = errGiantChunk
+			return num, c.err
+		}
+	}
+
+	// Now, we read the signature of the following payload and expect:
+	//   chunk-signature=" + <signature-as-hex> + "**\r\n"
+	//
+	// The signature is 64 bytes long (hex-encoded SHA256 hash) and
+	// starts with a 16 byte header: len("chunk-signature=") + 144 == 160.
+	var signature [160]byte
+	_, err = io.ReadFull(c.reader, signature[:])
+	if err != nil {
+		return c.handleErr(num, err)
+	}
+	if !bytes.HasPrefix(signature[:], []byte(chunkSignatureHeader)) {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err := c.reader.ReadByte()
+	if err != nil {
+		return c.handleErr(num, err)
+	}
+	if b != '\r' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if err != nil {
+		return c.handleErr(num, err)
+	}
+	if b != '\n' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+
+	if cap(c.buffer) < size {
+		c.buffer = make([]byte, size)
+	} else {
+		c.buffer = c.buffer[:size]
+	}
+
+	// Now, we read the payload and compute its SHA-256 hash.
+	_, err = io.ReadFull(c.reader, c.buffer)
+	if err == io.EOF && size != 0 {
+		err = io.ErrUnexpectedEOF
+	}
+	if err != nil && err != io.EOF {
+		c.err = err
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if b != '\r' || err != nil {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+	b, err = c.reader.ReadByte()
+	if err != nil {
+		return c.handleErr(num, err)
+	}
+	if b != '\n' {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+
+	// Once we have read the entire chunk successfully, we verify
+	// that the received signature is valid.
+
+	n, err := hex.Decode(signature[:], bytes.TrimSuffix(signature[:], []byte("**"))[16:])
+	if err != nil {
+		c.err = errMalformedChunkedEncoding
+		return num, c.err
+	}
+
+	if err = c.streamSigner.VerifySignature(nil, c.buffer, c.requestTime, signature[:n]); err != nil {
+		c.err = err
+		return num, c.err
+	}
+
+	// If the chunk size is zero we return io.EOF. As specified by AWS,
+	// only the last chunk is zero-sized.
+	if size == 0 {
+		c.err = io.EOF
+		return num, c.err
+	}
+
+	c.offset = copy(buf, c.buffer)
+	num += c.offset
+	return num, err
+}
+
+func (c *s3v4aChunkReader) handleErr(num int, err error) (int, error) {
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+
+	c.err = err
+	return num, c.err
+}
+
+func newSignV4aChunkedReader(req *http.Request) (io.ReadCloser, error) {
+	box, err := middleware.GetBoxData(req.Context())
+	if err != nil {
+		return nil, errs.GetAPIError(errs.ErrAuthorizationHeaderMalformed)
+	}
+
+	authHeaders, err := middleware.GetAuthHeaders(req.Context())
+	if err != nil {
+		return nil, errs.GetAPIError(errs.ErrAuthorizationHeaderMalformed)
+	}
+
+	seed, err := hex.DecodeString(authHeaders.SignatureV4)
+	if err != nil {
+		return nil, errs.GetAPIError(errs.ErrSignatureDoesNotMatch)
+	}
+
+	reqTime, err := middleware.GetClientTime(req.Context())
+	if err != nil {
+		return nil, errs.GetAPIError(errs.ErrMalformedDate)
+	}
+
+	credAdapter := v4a.SymmetricCredentialAdaptor{
+		SymmetricProvider: credentialsv2.NewStaticCredentialsProvider(authHeaders.AccessKeyID, box.Gate.SecretKey, ""),
+	}
+
+	creds, err := credAdapter.RetrievePrivateKey(req.Context())
+	if err != nil {
+		return nil, fmt.Errorf("failed to derive assymetric key from credentials: %w", err)
+	}
+
+	newStreamSigner := v4a.NewStreamSigner(creds, "s3", seed)
+
+	return &s3v4aChunkReader{
+		reader:       bufio.NewReader(req.Body),
+		streamSigner: newStreamSigner,
+		requestTime:  reqTime,
+		buffer:       make([]byte, 64*1024),
+	}, nil
+}

api/headers.go

@@ -94,7 +94,8 @@ const (
 
 	DefaultLocationConstraint = "default"
 
-	StreamingContentSHA256 = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD"
+	StreamingContentSHA256    = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD"
+	StreamingContentV4aSHA256 = "STREAMING-AWS4-ECDSA-P256-SHA256-PAYLOAD"
 
 	DefaultStorageClass = "STANDARD"
 )
@@ -125,7 +126,9 @@ var SystemMetadata = map[string]struct{}{
 	ContentLanguage:    {},
 }
 
-func IsSignedStreamingV4(r *http.Request) bool {
+func IsSignedStreamingV4(r *http.Request) (string, bool) {
-	return r.Header.Get(AmzContentSha256) == StreamingContentSHA256 &&
+	shaHeader := r.Header.Get(AmzContentSha256)
-		r.Method == http.MethodPut
+	return shaHeader,
+		(shaHeader == StreamingContentSHA256 || shaHeader == StreamingContentV4aSHA256) &&
+			r.Method == http.MethodPut
 }

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/aws/aws-sdk-go v1.44.6
 	github.com/aws/aws-sdk-go-v2 v1.30.3
 	github.com/aws/aws-sdk-go-v2/credentials v1.17.27
+	github.com/aws/smithy-go v1.20.1
 	github.com/bluele/gcache v0.0.2
 	github.com/go-chi/chi/v5 v5.0.8
 	github.com/google/uuid v1.6.0