Golang PublicKey.Public方法代码示例

//CreateKey returns a PublicKey created using KeyManagementServer's SigningService
func (s *KeyManagementServer) CreateKey(ctx context.Context, req *pb.CreateKeyRequest) (*pb.PublicKey, error) {
	service := s.CryptoServices[req.Algorithm]

	logger := ctxu.GetLogger(ctx)

	if service == nil {
		logger.Error("CreateKey: unsupported algorithm: ", req.Algorithm)
		return nil, fmt.Errorf("algorithm %s not supported for create key", req.Algorithm)
	}

	var tufKey data.PublicKey
	var err error

	tufKey, err = service.Create(req.Role, req.Gun, req.Algorithm)
	if err != nil {
		logger.Error("CreateKey: failed to create key: ", err)
		return nil, grpc.Errorf(codes.Internal, "Key creation failed")
	}
	logger.Info("CreateKey: Created KeyID ", tufKey.ID())

	return &pb.PublicKey{
		KeyInfo: &pb.KeyInfo{
			KeyID:     &pb.KeyID{ID: tufKey.ID()},
			Algorithm: &pb.Algorithm{Algorithm: tufKey.Algorithm()},
		},
		PublicKey: tufKey.Public(),
	}, nil
}

func getRSAPubKey(key data.PublicKey) (crypto.PublicKey, error) {
	algorithm := key.Algorithm()
	var pubKey crypto.PublicKey

	switch algorithm {
	case data.RSAx509Key:
		pemCert, _ := pem.Decode([]byte(key.Public()))
		if pemCert == nil {
			logrus.Debugf("failed to decode PEM-encoded x509 certificate")
			return nil, ErrInvalid
		}
		cert, err := x509.ParseCertificate(pemCert.Bytes)
		if err != nil {
			logrus.Debugf("failed to parse x509 certificate: %s\n", err)
			return nil, ErrInvalid
		}
		pubKey = cert.PublicKey
	case data.RSAKey:
		var err error
		pubKey, err = x509.ParsePKIXPublicKey(key.Public())
		if err != nil {
			logrus.Debugf("failed to parse public key: %s\n", err)
			return nil, ErrInvalid
		}
	default:
		// only accept RSA keys
		logrus.Debugf("invalid key type for RSAPSS verifier: %s", algorithm)
		return nil, ErrInvalidKeyType{}
	}

	return pubKey, nil
}

// Verify checks that an ed25519 signature is valid
func (v Ed25519Verifier) Verify(key data.PublicKey, sig []byte, msg []byte) error {
	if key.Algorithm() != data.ED25519Key {
		return ErrInvalidKeyType{}
	}
	var sigBytes [ed25519.SignatureSize]byte
	if len(sig) != ed25519.SignatureSize {
		logrus.Debugf("signature length is incorrect, must be %d, was %d.", ed25519.SignatureSize, len(sig))
		return ErrInvalid
	}
	copy(sigBytes[:], sig)

	var keyBytes [ed25519.PublicKeySize]byte
	pub := key.Public()
	if len(pub) != ed25519.PublicKeySize {
		logrus.Errorf("public key is incorrect size, must be %d, was %d.", ed25519.PublicKeySize, len(pub))
		return ErrInvalidKeyLength{msg: fmt.Sprintf("ed25519 public key must be %d bytes.", ed25519.PublicKeySize)}
	}
	n := copy(keyBytes[:], key.Public())
	if n < ed25519.PublicKeySize {
		logrus.Errorf("failed to copy the key, must have %d bytes, copied %d bytes.", ed25519.PublicKeySize, n)
		return ErrInvalid
	}

	if !ed25519.Verify(&keyBytes, msg, &sigBytes) {
		logrus.Debugf("failed ed25519 verification")
		return ErrInvalid
	}
	return nil
}

// X509PublicKeyID returns a public key ID as a string, given a
// data.PublicKey that contains an X509 Certificate
func X509PublicKeyID(certPubKey data.PublicKey) (string, error) {
	cert, err := LoadCertFromPEM(certPubKey.Public())
	if err != nil {
		return "", err
	}
	pubKeyBytes, err := x509.MarshalPKIXPublicKey(cert.PublicKey)
	if err != nil {
		return "", err
	}

	var key data.PublicKey
	switch certPubKey.Algorithm() {
	case data.ECDSAx509Key:
		key = data.NewECDSAPublicKey(pubKeyBytes)
	case data.RSAx509Key:
		key = data.NewRSAPublicKey(pubKeyBytes)
	}

	return key.ID(), nil
}