public static bool Validate(byte[] content, CBORObject alg, OneKey signKey, byte[] rgbSignature)
{
IDigest digest = null;
IDigest digest2 = null;
if (alg.Type == CBORType.TextString)
{
switch (alg.AsString())
{
case "HSS-LMS":
break;
default:
throw new Exception("Unknown signature algorithm");
}
}
else if (alg.Type == CBORType.Integer)
{
switch ((AlgorithmValuesInt)alg.AsInt32())
{
case AlgorithmValuesInt.ECDSA_256:
case AlgorithmValuesInt.RSA_PSS_256:
digest = new Sha256Digest();
digest2 = new Sha256Digest();
break;
case AlgorithmValuesInt.ECDSA_384:
case AlgorithmValuesInt.RSA_PSS_384:
digest = new Sha384Digest();
digest2 = new Sha384Digest();
break;
case AlgorithmValuesInt.ECDSA_512:
case AlgorithmValuesInt.RSA_PSS_512:
digest = new Sha512Digest();
digest2 = new Sha512Digest();
break;
case AlgorithmValuesInt.EdDSA:
break;
default:
throw new CoseException("Unknown signature algorith");
}
}
else
{
throw new CoseException("Algorithm incorrectly encoded");
}
if (alg.Type == CBORType.TextString)
{
switch (alg.AsString())
{
case "HSS-LMS":
return(HashSig.Validate(content,
signKey[CoseKeyParameterKeys.Lms_Public].GetByteString(),
rgbSignature));
default:
throw new CoseException("Unknown Algorithm");
}
}
else if (alg.Type == CBORType.Integer)
{
switch ((AlgorithmValuesInt)alg.AsInt32())
{
case AlgorithmValuesInt.RSA_PSS_256:
case AlgorithmValuesInt.RSA_PSS_384:
case AlgorithmValuesInt.RSA_PSS_512: {
PssSigner signer = new PssSigner(new RsaEngine(), digest, digest2, digest.GetDigestSize());
ICipherParameters prv = signKey.AsPublicKey();
ParametersWithRandom param = new ParametersWithRandom(prv, Message.GetPRNG());
signer.Init(false, param);
signer.BlockUpdate(content, 0, content.Length);
return(signer.VerifySignature(rgbSignature));
}
case AlgorithmValuesInt.ECDSA_256:
case AlgorithmValuesInt.ECDSA_384:
case AlgorithmValuesInt.ECDSA_512: {
if (signKey.GetKeyType() != GeneralValuesInt.KeyType_EC2)
{
throw new CoseException("Key is not correctly constructed.");
}
digest.BlockUpdate(content, 0, content.Length);
byte[] digestedMessage = new byte[digest.GetDigestSize()];
digest.DoFinal(digestedMessage, 0);
ICipherParameters param = signKey.AsPublicKey();
ECDsaSigner ecdsa = new ECDsaSigner();
ecdsa.Init(false, param);
BigInteger r = new BigInteger(1, rgbSignature, 0, rgbSignature.Length / 2);
BigInteger s = new BigInteger(1, rgbSignature, rgbSignature.Length / 2, rgbSignature.Length / 2);
return(ecdsa.VerifySignature(digestedMessage, r, s));
}
#if true
case AlgorithmValuesInt.EdDSA: {
ISigner eddsa;
if (signKey[CoseKeyParameterKeys.EC_Curve].Equals(GeneralValues.Ed25519))
{
ICipherParameters privKey = signKey.AsPublicKey();
eddsa = new Ed25519Signer();
eddsa.Init(false, privKey);
}
else if (signKey[CoseKeyParameterKeys.EC_Curve].Equals(GeneralValues.Ed448))
{
Ed448PublicKeyParameters privKey =
new Ed448PublicKeyParameters(signKey[CoseKeyParameterKeys.OKP_X].GetByteString(), 0);
eddsa = new Ed448Signer(new byte[0]);
eddsa.Init(false, privKey);
}
else
{
throw new CoseException("Unrecognized curve");
}
eddsa.BlockUpdate(content, 0, content.Length);
return(eddsa.VerifySignature(rgbSignature));
}
#endif
default:
throw new CoseException("Unknown Algorithm");
}
}
else
{
throw new CoseException("Algorithm incorrectly encoded");
}
}
public bool Validate(OneKey signerKey)
{
CBORObject alg; // Get the set algorithm or infer one
byte[] bytesToBeSigned = toBeSigned();
alg = FindAttribute(HeaderKeys.Algorithm);
if (alg == null)
{
throw new CoseException("No algorithm specified");
}
IDigest digest = null;
IDigest digest2 = null;
if (alg.Type == CBORType.TextString)
{
switch (alg.AsString())
{
case "ES384":
case "PS384":
digest = new Sha384Digest();
digest2 = new Sha384Digest();
break;
case "HSS-LMS":
break;
default:
throw new CoseException("Unknown signature algorithm");
}
}
else if (alg.Type == CBORType.Integer)
{
switch ((AlgorithmValuesInt)alg.AsInt32())
{
case AlgorithmValuesInt.ECDSA_256:
case AlgorithmValuesInt.RSA_PSS_256:
digest = new Sha256Digest();
digest2 = new Sha256Digest();
break;
case AlgorithmValuesInt.ECDSA_384:
case AlgorithmValuesInt.RSA_PSS_384:
digest = new Sha384Digest();
digest2 = new Sha384Digest();
break;
case AlgorithmValuesInt.ECDSA_512:
case AlgorithmValuesInt.RSA_PSS_512:
digest = new Sha512Digest();
digest2 = new Sha512Digest();
break;
case AlgorithmValuesInt.EdDSA:
break;
default:
throw new CoseException("Unknown signature algorithm");
}
}
else
{
throw new CoseException("Algorthm incorrectly encoded");
}
if (alg.Type == CBORType.TextString)
{
switch (alg.AsString())
{
case "HSS-LMS":
return(HashSig.Validate(bytesToBeSigned,
signerKey[CoseKeyParameterKeys.Lms_Public].GetByteString(),
_rgbSignature));
default:
throw new CoseException("Unknown Algorithm");
}
}
else if (alg.Type == CBORType.Integer)
{
switch ((AlgorithmValuesInt)alg.AsInt32())
{
case AlgorithmValuesInt.RSA_PSS_256:
case AlgorithmValuesInt.RSA_PSS_384:
case AlgorithmValuesInt.RSA_PSS_512: {
PssSigner signer = new PssSigner(new RsaEngine(), digest, digest2, digest.GetByteLength());
RsaKeyParameters prv = new RsaPrivateCrtKeyParameters(signerKey.AsBigInteger(CoseKeyParameterKeys.RSA_n), signerKey.AsBigInteger(CoseKeyParameterKeys.RSA_e), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_d), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_p), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_q), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_dP), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_dQ), _keyToSign.AsBigInteger(CoseKeyParameterKeys.RSA_qInv));
ParametersWithRandom param = new ParametersWithRandom(prv, GetPRNG());
signer.Init(false, param);
signer.BlockUpdate(bytesToBeSigned, 0, bytesToBeSigned.Length);
return(signer.VerifySignature(_rgbSignature));
}
case AlgorithmValuesInt.ECDSA_256:
case AlgorithmValuesInt.ECDSA_384:
case AlgorithmValuesInt.ECDSA_512: {
digest.BlockUpdate(bytesToBeSigned, 0, bytesToBeSigned.Length);
byte[] digestedMessage = new byte[digest.GetDigestSize()];
digest.DoFinal(digestedMessage, 0);
X9ECParameters p = signerKey.GetCurve();
ECDomainParameters parameters = new ECDomainParameters(p.Curve, p.G, p.N, p.H);
ECPoint point = signerKey.GetPoint();
ECPublicKeyParameters param = new ECPublicKeyParameters(point, parameters);
ECDsaSigner ecdsa = new ECDsaSigner();
ecdsa.Init(false, param);
BigInteger r = new BigInteger(1, _rgbSignature, 0, _rgbSignature.Length / 2);
BigInteger s = new BigInteger(1, _rgbSignature, _rgbSignature.Length / 2, _rgbSignature.Length / 2);
return(ecdsa.VerifySignature(digestedMessage, r, s));
}
#if true
case AlgorithmValuesInt.EdDSA: {
ISigner eddsa;
if (signerKey[CoseKeyParameterKeys.EC_Curve].Equals(GeneralValues.Ed25519))
{
Ed25519PublicKeyParameters privKey =
new Ed25519PublicKeyParameters(signerKey[CoseKeyParameterKeys.OKP_X].GetByteString(), 0);
eddsa = new Ed25519Signer();
eddsa.Init(false, privKey);
}
else if (signerKey[CoseKeyParameterKeys.EC_Curve].Equals(GeneralValues.Ed448))
{
Ed448PublicKeyParameters privKey =
new Ed448PublicKeyParameters(signerKey[CoseKeyParameterKeys.OKP_X].GetByteString(), 0);
eddsa = new Ed448Signer(new byte[0]);
eddsa.Init(false, privKey);
}
else
{
throw new CoseException("Unrecognized curve");
}
eddsa.BlockUpdate(bytesToBeSigned, 0, bytesToBeSigned.Length);
return(eddsa.VerifySignature(_rgbSignature));
}
#endif
default:
throw new CoseException("Unknown Algorithm");
}
}
else
{
throw new CoseException("Algorithm incorrectly encoded");
}
}