forked from TrueCloudLab/frostfs-sdk-go
129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
package neofscrypto
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import (
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/v2/refs"
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)
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// Scheme represents digital signature algorithm with fixed cryptographic hash function.
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//
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// Negative values are reserved and depend on context (e.g. unsupported scheme).
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type Scheme int32
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//nolint:revive
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const (
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_ Scheme = iota - 1
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ECDSA_SHA512 // ECDSA with SHA-512 hashing (FIPS 186-3)
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ECDSA_DETERMINISTIC_SHA256 // Deterministic ECDSA with SHA-256 hashing (RFC 6979)
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ECDSA_WALLETCONNECT // Wallet Connect signature scheme
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)
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// String implements fmt.Stringer.
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func (x Scheme) String() string {
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return refs.SignatureScheme(x).String()
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}
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// maps Scheme to blank PublicKey constructor.
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var publicKeys = make(map[Scheme]func() PublicKey)
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// RegisterScheme registers a function that returns a new blank PublicKey
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// instance for the given Scheme. This is intended to be called from the init
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// function in packages that implement signature schemes.
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//
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// RegisterScheme panics if function for the given Scheme is already registered.
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//
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// Note that RegisterScheme isn't tread-safe.
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func RegisterScheme(scheme Scheme, f func() PublicKey) {
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_, ok := publicKeys[scheme]
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if ok {
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panic(fmt.Sprintf("scheme %v is already registered", scheme))
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}
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publicKeys[scheme] = f
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}
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// Signer is an interface of entities that can be used for signing operations
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// in NeoFS. Unites secret and public parts. For example, an ECDSA private key
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// or external auth service.
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//
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// See also PublicKey.
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type Signer interface {
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// Scheme returns corresponding signature scheme.
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Scheme() Scheme
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// Sign signs digest of the given data. Implementations encapsulate data
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// hashing that depends on Scheme. For example, if scheme uses SHA-256, then
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// Sign signs SHA-256 hash of the data.
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Sign(data []byte) ([]byte, error)
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// Public returns the public key corresponding to the Signer.
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Public() PublicKey
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}
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// PublicKey represents a public key using fixed signature scheme supported by
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// NeoFS.
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//
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// See also Signer.
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type PublicKey interface {
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// MaxEncodedSize returns maximum size required for binary-encoded
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// public key.
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//
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// MaxEncodedSize MUST NOT return value greater than any return of
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// Encode.
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MaxEncodedSize() int
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// Encode encodes public key into buf. Returns number of bytes
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// written.
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//
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// Encode MUST panic if buffer size is insufficient and less than
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// MaxEncodedSize (*). Encode MUST return negative value
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// on any failure except (*).
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//
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// Encode is a reverse operation to Decode.
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Encode(buf []byte) int
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// Decode decodes binary public key.
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//
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// Decode is a reverse operation to Encode.
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Decode([]byte) error
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// Verify checks signature of the given data. True means correct signature.
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Verify(data, signature []byte) bool
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}
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// StaticSigner emulates real sign and contains already precalculated hash.
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// Provides neofscrypto.Signer interface.
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type StaticSigner struct {
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scheme Scheme
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sig []byte
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pubKey PublicKey
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}
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// NewStaticSigner creates new StaticSigner.
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func NewStaticSigner(scheme Scheme, sig []byte, pubKey PublicKey) *StaticSigner {
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return &StaticSigner{
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scheme: scheme,
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sig: sig,
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pubKey: pubKey,
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}
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}
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// Scheme returns neofscrypto.ECDSA_DETERMINISTIC_SHA256.
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// Implements neofscrypto.Signer.
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func (s *StaticSigner) Scheme() Scheme {
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return s.scheme
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}
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// Sign returns precalculated hash.
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// Implements neofscrypto.Signer.
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func (s *StaticSigner) Sign(_ []byte) ([]byte, error) {
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return s.sig, nil
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}
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// Public returns neofscrypto.PublicKey.
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// Implements neofscrypto.Signer.
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func (s *StaticSigner) Public() PublicKey {
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return s.pubKey
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}
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