/// <summary>
/// Computes the signature of a hash that was produced by the hash algorithm specified by "hashAlgorithm."
/// </summary>
public override byte[] SignHash(byte[] hash)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
int estimatedSize;
switch (KeySize)
{
case 256: estimatedSize = 64; break;
case 384: estimatedSize = 96; break;
case 521: estimatedSize = 132; break;
default:
// If we got here, the range of legal key sizes for ECDsaCng was expanded and someone didn't update this switch.
// Since it isn't a fatal error to miscalculate the estimatedSize, don't throw an exception. Just truck along.
estimatedSize = KeySize / 4;
break;
}
unsafe
{
byte[] signature = CngAsymmetricAlgorithmCore.SignHash(Key, hash, AsymmetricPaddingMode.None, null, estimatedSize);
return(signature);
}
}
/// <summary>
/// Computes the signature of a hash that was produced by the hash algorithm specified by "hashAlgorithm."
/// </summary>
public override byte[] SignHash(byte[] hash, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
unsafe
{
byte[] signature = null;
SignOrVerify(padding, hashAlgorithm, hash,
delegate(AsymmetricPaddingMode paddingMode, void *pPaddingInfo)
{
int estimatedSize = KeySize / 8;
signature = CngAsymmetricAlgorithmCore.SignHash(Key, hash, paddingMode, pPaddingInfo, estimatedSize);
}
);
return(signature);
}
}