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- package jwt
-
- import (
- "crypto"
- "crypto/ed25519"
- "crypto/rand"
- "errors"
- )
-
- var (
- ErrEd25519Verification = errors.New("ed25519: verification error")
- )
-
- // SigningMethodEd25519 implements the EdDSA family.
- // Expects ed25519.PrivateKey for signing and ed25519.PublicKey for verification
- type SigningMethodEd25519 struct{}
-
- // Specific instance for EdDSA
- var (
- SigningMethodEdDSA *SigningMethodEd25519
- )
-
- func init() {
- SigningMethodEdDSA = &SigningMethodEd25519{}
- RegisterSigningMethod(SigningMethodEdDSA.Alg(), func() SigningMethod {
- return SigningMethodEdDSA
- })
- }
-
- func (m *SigningMethodEd25519) Alg() string {
- return "EdDSA"
- }
-
- // Verify implements token verification for the SigningMethod.
- // For this verify method, key must be an ed25519.PublicKey
- func (m *SigningMethodEd25519) Verify(signingString string, sig []byte, key interface{}) error {
- var ed25519Key ed25519.PublicKey
- var ok bool
-
- if ed25519Key, ok = key.(ed25519.PublicKey); !ok {
- return newError("Ed25519 verify expects ed25519.PublicKey", ErrInvalidKeyType)
- }
-
- if len(ed25519Key) != ed25519.PublicKeySize {
- return ErrInvalidKey
- }
-
- // Verify the signature
- if !ed25519.Verify(ed25519Key, []byte(signingString), sig) {
- return ErrEd25519Verification
- }
-
- return nil
- }
-
- // Sign implements token signing for the SigningMethod.
- // For this signing method, key must be an ed25519.PrivateKey
- func (m *SigningMethodEd25519) Sign(signingString string, key interface{}) ([]byte, error) {
- var ed25519Key crypto.Signer
- var ok bool
-
- if ed25519Key, ok = key.(crypto.Signer); !ok {
- return nil, newError("Ed25519 sign expects crypto.Signer", ErrInvalidKeyType)
- }
-
- if _, ok := ed25519Key.Public().(ed25519.PublicKey); !ok {
- return nil, ErrInvalidKey
- }
-
- // Sign the string and return the result. ed25519 performs a two-pass hash
- // as part of its algorithm. Therefore, we need to pass a non-prehashed
- // message into the Sign function, as indicated by crypto.Hash(0)
- sig, err := ed25519Key.Sign(rand.Reader, []byte(signingString), crypto.Hash(0))
- if err != nil {
- return nil, err
- }
-
- return sig, nil
- }
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