func (v Ed25519Verifier) Verify(key data.Key, sig []byte, msg []byte) error {
var sigBytes [ed25519.SignatureSize]byte
if len(sig) != len(sigBytes) {
logrus.Infof("signature length is incorrect, must be %d, was %d.", ed25519.SignatureSize, len(sig))
return ErrInvalid
}
copy(sigBytes[:], sig)
var keyBytes [ed25519.PublicKeySize]byte
copy(keyBytes[:], key.Public())
if !ed25519.Verify(&keyBytes, msg, &sigBytes) {
logrus.Infof("failed ed25519 verification")
return ErrInvalid
}
return nil
}
// Verify does the actual check.
// N.B. We have not been able to make this work in a way that is compatible
// with PyCrypto.
func (v RSAPyCryptoVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
digest := sha256.Sum256(msg)
k, _ := pem.Decode([]byte(key.Public()))
if k == nil {
logrus.Infof("failed to decode PEM-encoded x509 certificate")
return ErrInvalid
}
pub, err := x509.ParsePKIXPublicKey(k.Bytes)
if err != nil {
logrus.Infof("failed to parse public key: %s\n", err)
return ErrInvalid
}
return verifyPSS(pub, digest[:], sig)
}
// Verify does the actual check.
func (v RSAPSSVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
algorithm := key.Algorithm()
var pubKey crypto.PublicKey
switch algorithm {
case data.RSAx509Key:
pemCert, _ := pem.Decode([]byte(key.Public()))
if pemCert == nil {
logrus.Infof("failed to decode PEM-encoded x509 certificate")
return ErrInvalid
}
cert, err := x509.ParseCertificate(pemCert.Bytes)
if err != nil {
logrus.Infof("failed to parse x509 certificate: %s\n", err)
return ErrInvalid
}
pubKey = cert.PublicKey
case data.RSAKey:
var err error
pubKey, err = x509.ParsePKIXPublicKey(key.Public())
if err != nil {
logrus.Infof("failed to parse public key: %s\n", err)
return ErrInvalid
}
default:
logrus.Infof("invalid key type for RSAPSS verifier: %s", algorithm)
return ErrInvalid
}
digest := sha256.Sum256(msg)
return verifyPSS(pubKey, digest[:], sig)
}
func (v RSAPemVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
digest := sha256.Sum256(msg)
k, _ := pem.Decode([]byte(key.Public()))
cert, err := x509.ParseCertificate(k.Bytes)
if err != nil {
logrus.Errorf("Failed to parse public key: %s\n", err.Error())
return ErrInvalid
}
rsaPub, ok := cert.PublicKey.(*rsa.PublicKey)
if !ok {
logrus.Infof("Value returned from ParsePKIXPublicKey was not an RSA public key")
return ErrInvalid
}
if err = rsa.VerifyPKCS1v15(rsaPub, crypto.SHA256, digest[:], sig); err != nil {
logrus.Errorf("Failed verification: %s", err.Error())
return ErrInvalid
}
return nil
}
func (v RSAVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
digest := sha256.Sum256(msg)
keyReader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(key.Public()))
keyBytes, _ := ioutil.ReadAll(keyReader)
pub, err := x509.ParsePKIXPublicKey(keyBytes)
if err != nil {
logrus.Infof("Failed to parse public key: %s\n", err)
return ErrInvalid
}
rsaPub, ok := pub.(*rsa.PublicKey)
if !ok {
logrus.Infof("Value returned from ParsePKIXPublicKey was not an RSA public key")
return ErrInvalid
}
if err = rsa.VerifyPKCS1v15(rsaPub, crypto.SHA256, digest[:], sig); err != nil {
logrus.Infof("Failed verification: %s", err)
return ErrInvalid
}
return nil
}
// Verify does the actual check.
// N.B. We have not been able to make this work in a way that is compatible
// with PyCrypto.
func (v RSAPSSVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
digest := sha256.Sum256(msg)
k, _ := pem.Decode([]byte(key.Public()))
pub, err := x509.ParsePKIXPublicKey(k.Bytes)
if err != nil {
logrus.Infof("Failed to parse public key: %s\n", err)
return ErrInvalid
}
rsaPub, ok := pub.(*rsa.PublicKey)
if !ok {
logrus.Infof("Value returned from ParsePKIXPublicKey was not an RSA public key")
return ErrInvalid
}
opts := rsa.PSSOptions{SaltLength: sha256.Size, Hash: crypto.SHA256}
if err = rsa.VerifyPSS(rsaPub, crypto.SHA256, digest[:], sig, &opts); err != nil {
logrus.Infof("Failed verification: %s", err)
return ErrInvalid
}
return nil
}
// Verify does the actual check.
func (v ECDSAVerifier) Verify(key data.Key, sig []byte, msg []byte) error {
algorithm := key.Algorithm()
var pubKey crypto.PublicKey
switch algorithm {
case data.ECDSAx509Key:
pemCert, _ := pem.Decode([]byte(key.Public()))
if pemCert == nil {
logrus.Infof("failed to decode PEM-encoded x509 certificate for keyID: %s", key.ID())
logrus.Debugf("certificate bytes: %s", string(key.Public()))
return ErrInvalid
}
cert, err := x509.ParseCertificate(pemCert.Bytes)
if err != nil {
logrus.Infof("failed to parse x509 certificate: %s\n", err)
return ErrInvalid
}
pubKey = cert.PublicKey
case data.ECDSAKey:
var err error
pubKey, err = x509.ParsePKIXPublicKey(key.Public())
if err != nil {
logrus.Infof("Failed to parse private key for keyID: %s, %s\n", key.ID(), err)
return ErrInvalid
}
default:
logrus.Infof("invalid key type for ECDSA verifier: %s", algorithm)
return ErrInvalid
}
ecdsaPubKey, ok := pubKey.(*ecdsa.PublicKey)
if !ok {
logrus.Infof("value isn't an ECDSA public key")
return ErrInvalid
}
sigLength := len(sig)
expectedOctetLength := 2 * ((ecdsaPubKey.Params().BitSize + 7) >> 3)
if sigLength != expectedOctetLength {
logrus.Infof("signature had an unexpected length")
return ErrInvalid
}
rBytes, sBytes := sig[:sigLength/2], sig[sigLength/2:]
r := new(big.Int).SetBytes(rBytes)
s := new(big.Int).SetBytes(sBytes)
digest := sha256.Sum256(msg)
if !ecdsa.Verify(ecdsaPubKey, digest[:], r, s) {
logrus.Infof("failed ECDSA signature validation")
return ErrInvalid
}
return nil
}