public override bool VerifyHash(ReadOnlySpan <byte> hash, ReadOnlySpan <byte> signature, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
ArgumentException.ThrowIfNullOrEmpty(hashAlgorithm.Name, nameof(hashAlgorithm));
ArgumentNullException.ThrowIfNull(padding);
ThrowIfDisposed();
if (padding == RSASignaturePadding.Pkcs1)
{
Interop.AppleCrypto.PAL_HashAlgorithm palAlgId =
PalAlgorithmFromAlgorithmName(hashAlgorithm, out _);
return(Interop.AppleCrypto.VerifySignature(
GetKeys().PublicKey,
hash,
signature,
palAlgId,
Interop.AppleCrypto.PAL_SignatureAlgorithm.RsaPkcs1));
}
else if (padding.Mode == RSASignaturePaddingMode.Pss)
{
SafeSecKeyRefHandle publicKey = GetKeys().PublicKey;
int keySize = KeySize;
int rsaSize = RsaPaddingProcessor.BytesRequiredForBitCount(keySize);
if (signature.Length != rsaSize)
{
return(false);
}
if (hash.Length != RsaPaddingProcessor.HashLength(hashAlgorithm))
{
return(false);
}
byte[] rented = CryptoPool.Rent(rsaSize);
Span <byte> unwrapped = new Span <byte>(rented, 0, rsaSize);
try
{
if (!Interop.AppleCrypto.TryRsaVerificationPrimitive(
publicKey,
signature,
unwrapped,
out int bytesWritten))
{
Debug.Fail($"TryRsaVerificationPrimitive with a pre-allocated buffer");
throw new CryptographicException();
}
Debug.Assert(bytesWritten == rsaSize);
return(RsaPaddingProcessor.VerifyPss(hashAlgorithm, hash, unwrapped, keySize));
}
finally
{
CryptographicOperations.ZeroMemory(unwrapped);
CryptoPool.Return(rented, clearSize: 0);
}
}
throw new CryptographicException(SR.Cryptography_InvalidPaddingMode);
}