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- package jwt
-
- import (
- "crypto"
- "crypto/rand"
- "crypto/rsa"
- )
-
- // SigningMethodRSA implements the RSA family of signing methods.
- // Expects *rsa.PrivateKey for signing and *rsa.PublicKey for validation
- type SigningMethodRSA struct {
- Name string
- Hash crypto.Hash
- }
-
- // Specific instances for RS256 and company
- var (
- SigningMethodRS256 *SigningMethodRSA
- SigningMethodRS384 *SigningMethodRSA
- SigningMethodRS512 *SigningMethodRSA
- )
-
- func init() {
- // RS256
- SigningMethodRS256 = &SigningMethodRSA{"RS256", crypto.SHA256}
- RegisterSigningMethod(SigningMethodRS256.Alg(), func() SigningMethod {
- return SigningMethodRS256
- })
-
- // RS384
- SigningMethodRS384 = &SigningMethodRSA{"RS384", crypto.SHA384}
- RegisterSigningMethod(SigningMethodRS384.Alg(), func() SigningMethod {
- return SigningMethodRS384
- })
-
- // RS512
- SigningMethodRS512 = &SigningMethodRSA{"RS512", crypto.SHA512}
- RegisterSigningMethod(SigningMethodRS512.Alg(), func() SigningMethod {
- return SigningMethodRS512
- })
- }
-
- func (m *SigningMethodRSA) Alg() string {
- return m.Name
- }
-
- // Verify implements token verification for the SigningMethod
- // For this signing method, must be an *rsa.PublicKey structure.
- func (m *SigningMethodRSA) Verify(signingString string, sig []byte, key interface{}) error {
- var rsaKey *rsa.PublicKey
- var ok bool
-
- if rsaKey, ok = key.(*rsa.PublicKey); !ok {
- return newError("RSA verify expects *rsa.PublicKey", ErrInvalidKeyType)
- }
-
- // Create hasher
- if !m.Hash.Available() {
- return ErrHashUnavailable
- }
- hasher := m.Hash.New()
- hasher.Write([]byte(signingString))
-
- // Verify the signature
- return rsa.VerifyPKCS1v15(rsaKey, m.Hash, hasher.Sum(nil), sig)
- }
-
- // Sign implements token signing for the SigningMethod
- // For this signing method, must be an *rsa.PrivateKey structure.
- func (m *SigningMethodRSA) Sign(signingString string, key interface{}) ([]byte, error) {
- var rsaKey *rsa.PrivateKey
- var ok bool
-
- // Validate type of key
- if rsaKey, ok = key.(*rsa.PrivateKey); !ok {
- return nil, newError("RSA sign expects *rsa.PrivateKey", ErrInvalidKeyType)
- }
-
- // Create the hasher
- if !m.Hash.Available() {
- return nil, ErrHashUnavailable
- }
-
- hasher := m.Hash.New()
- hasher.Write([]byte(signingString))
-
- // Sign the string and return the encoded bytes
- if sigBytes, err := rsa.SignPKCS1v15(rand.Reader, rsaKey, m.Hash, hasher.Sum(nil)); err == nil {
- return sigBytes, nil
- } else {
- return nil, err
- }
- }
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