public override byte[] CreateSignature(byte[] hash)
{
if (hash == null)
{
throw new ArgumentNullException(nameof(hash));
}
SafeDsaHandle key = _key.Value;
byte[] signature = new byte[Interop.Crypto.DsaEncodedSignatureSize(key)];
int signatureSize;
bool success = Interop.Crypto.DsaSign(key, hash, hash.Length, signature, out signatureSize);
if (!success)
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
Debug.Assert(
signatureSize <= signature.Length,
"DSA_sign reported an unexpected signature size",
"DSA_sign reported signatureSize was {0}, when <= {1} was expected",
signatureSize,
signature.Length);
int signatureFieldSize = Interop.Crypto.DsaSignatureFieldSize(key) * BitsPerByte;
byte[] converted = OpenSslAsymmetricAlgorithmCore.ConvertDerToIeee1363(signature, 0, signatureSize, signatureFieldSize);
return(converted);
}
public override byte[] SignHash(byte[] hash)
{
if (hash == null)
{
throw new ArgumentNullException(nameof(hash));
}
SafeEcKeyHandle key = _key.Value;
int signatureLength = Interop.Crypto.EcDsaSize(key);
byte[] signature = new byte[signatureLength];
if (!Interop.Crypto.EcDsaSign(hash, hash.Length, signature, ref signatureLength, key))
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
byte[] converted = OpenSslAsymmetricAlgorithmCore.ConvertDerToIeee1363(signature, 0, signatureLength, KeySize);
return(converted);
}