public override byte[] SignHash(byte[] hash, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
if (String.IsNullOrEmpty(hashAlgorithm.Name))
{
throw new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm");
}
if (padding == null)
{
throw new ArgumentNullException("padding");
}
// Keep a local copy of the key.
CngKey key = Key;
SafeNCryptKeyHandle keyHandle = key.Handle;
if (padding == RSASignaturePadding.Pkcs1)
{
return(NCryptNative.SignHashPkcs1(keyHandle, hash, hashAlgorithm.Name));
}
else if (padding == RSASignaturePadding.Pss)
{
return(NCryptNative.SignHashPss(keyHandle, hash, hashAlgorithm.Name, hash.Length));
}
else
{
// no other padding possibilities at present, but we might version independently from more being added.
throw new CryptographicException(SR.GetString(SR.Cryptography_UnsupportedPaddingMode));
}
}