mirror of https://github.com/golang-jwt/jwt.git
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package jwt
|
|
|
|
import (
|
|
"errors"
|
|
"encoding/base64"
|
|
"encoding/pem"
|
|
"crypto"
|
|
"crypto/x509"
|
|
"crypto/rsa"
|
|
_ "crypto/sha256"
|
|
)
|
|
|
|
type SigningMethodRS256 struct {}
|
|
|
|
func init() {
|
|
RegisterSigningMethod("RS256", func() SigningMethod {
|
|
return new(SigningMethodRS256)
|
|
})
|
|
}
|
|
|
|
func (m *SigningMethodRS256) Verify(signingString, signature string, key []byte)(err error) {
|
|
// len % 4
|
|
switch len(signature) % 4 {
|
|
case 2:
|
|
signature = signature + "=="
|
|
case 3:
|
|
signature = signature + "==="
|
|
}
|
|
|
|
// Key
|
|
var sig []byte
|
|
if sig, err = base64.URLEncoding.DecodeString(signature); err == nil {
|
|
var block *pem.Block
|
|
if block, _ = pem.Decode(key); block != nil {
|
|
var parsedKey interface{}
|
|
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err == nil {
|
|
if rsaKey, ok := parsedKey.(*rsa.PublicKey); ok {
|
|
hasher := crypto.SHA256.New()
|
|
hasher.Write([]byte(signingString))
|
|
|
|
err = rsa.VerifyPKCS1v15(rsaKey, crypto.SHA256, hasher.Sum(nil), sig)
|
|
} else {
|
|
err = errors.New("Key is not a valid RSA public key")
|
|
}
|
|
}
|
|
} else {
|
|
err = errors.New("Could not parse key data")
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (m *SigningMethodRS256) Sign(token, key []byte)error {
|
|
return nil
|
|
} |