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- package jwt
-
- import (
- "errors"
-
- "crypto/ed25519"
- )
-
- var (
- ErrEd25519Verification = errors.New("ed25519: verification error")
- )
-
- // 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"
- }
-
- // Implements the Verify method from SigningMethod
- // For this verify method, key must be an ed25519.PublicKey
- func (m *SigningMethodEd25519) Verify(signingString, signature string, key interface{}) error {
- var err error
- var ed25519Key ed25519.PublicKey
- var ok bool
-
- if ed25519Key, ok = key.(ed25519.PublicKey); !ok {
- return ErrInvalidKeyType
- }
-
- if len(ed25519Key) != ed25519.PublicKeySize {
- return ErrInvalidKey
- }
-
- // Decode the signature
- var sig []byte
- if sig, err = DecodeSegment(signature); err != nil {
- return err
- }
-
- // Verify the signature
- if !ed25519.Verify(ed25519Key, []byte(signingString), sig) {
- return ErrEd25519Verification
- }
-
- return nil
- }
-
- // Implements the Sign method from SigningMethod
- // For this signing method, key must be an ed25519.PrivateKey
- func (m *SigningMethodEd25519) Sign(signingString string, key interface{}) (string, error) {
- var ed25519Key ed25519.PrivateKey
- var ok bool
-
- if ed25519Key, ok = key.(ed25519.PrivateKey); !ok {
- return "", ErrInvalidKeyType
- }
-
- // ed25519.Sign panics if private key not equal to ed25519.PrivateKeySize
- // this allows to avoid recover usage
- if len(ed25519Key) != ed25519.PrivateKeySize {
- return "", ErrInvalidKey
- }
-
- // Sign the string and return the encoded result
- sig := ed25519.Sign(ed25519Key, []byte(signingString))
- return EncodeSegment(sig), nil
- }
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