public override bool TrySignHash(ReadOnlySpan <byte> hash, Span <byte> destination, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding, out int bytesWritten)
{
ArgumentException.ThrowIfNullOrEmpty(hashAlgorithm.Name, nameof(hashAlgorithm));
ArgumentNullException.ThrowIfNull(padding);
ThrowIfDisposed();
bool pssPadding = padding.Mode switch
{
RSASignaturePaddingMode.Pss => true,
RSASignaturePaddingMode.Pkcs1 => false,
_ => throw new CryptographicException(SR.Cryptography_InvalidPaddingMode)
};
SecKeyPair keys = GetKeys();
if (keys.PrivateKey == null)
{
throw new CryptographicException(SR.Cryptography_CSP_NoPrivateKey);
}
int keySize = KeySize;
int rsaSize = RsaPaddingProcessor.BytesRequiredForBitCount(keySize);
if (!pssPadding)
{
Interop.AppleCrypto.PAL_HashAlgorithm palAlgId =
PalAlgorithmFromAlgorithmName(hashAlgorithm, out int expectedSize);
if (hash.Length != expectedSize)
{
// Windows: NTE_BAD_DATA ("Bad Data.")
// OpenSSL: RSA_R_INVALID_MESSAGE_LENGTH ("invalid message length")
throw new CryptographicException(
SR.Format(
SR.Cryptography_BadHashSize_ForAlgorithm,
hash.Length,
expectedSize,
hashAlgorithm.Name));
}
if (destination.Length < rsaSize)
{
bytesWritten = 0;
return(false);
}
return(Interop.AppleCrypto.TryCreateSignature(
keys.PrivateKey,
hash,
destination,
palAlgId,
Interop.AppleCrypto.PAL_SignatureAlgorithm.RsaPkcs1,
out bytesWritten));
}
Debug.Assert(padding.Mode == RSASignaturePaddingMode.Pss);
if (destination.Length < rsaSize)
{
bytesWritten = 0;
return(false);
}
byte[] rented = CryptoPool.Rent(rsaSize);
Span <byte> buf = new Span <byte>(rented, 0, rsaSize);
RsaPaddingProcessor.EncodePss(hashAlgorithm, hash, buf, keySize);
try
{
return(Interop.AppleCrypto.TryRsaSignaturePrimitive(keys.PrivateKey, buf, destination, out bytesWritten));
}
finally
{
CryptographicOperations.ZeroMemory(buf);
CryptoPool.Return(rented, clearSize: 0);
}
}
private bool TrySignHash(
ReadOnlySpan <byte> hash,
Span <byte> destination,
HashAlgorithmName hashAlgorithm,
RSASignaturePadding padding,
bool allocateSignature,
out int bytesWritten,
out byte[] signature)
{
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
Debug.Assert(padding != null);
signature = null;
// Do not factor out getting _key.Value, since the key creation should not happen on
// invalid padding modes.
if (padding.Mode == RSASignaturePaddingMode.Pkcs1)
{
int algorithmNid = GetAlgorithmNid(hashAlgorithm);
SafeRsaHandle rsa = _key.Value;
int bytesRequired = Interop.Crypto.RsaSize(rsa);
if (allocateSignature)
{
Debug.Assert(destination.Length == 0);
signature = new byte[bytesRequired];
destination = signature;
}
if (destination.Length < bytesRequired)
{
bytesWritten = 0;
return(false);
}
if (!Interop.Crypto.RsaSign(algorithmNid, hash, hash.Length, destination, out int signatureSize, rsa))
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
Debug.Assert(
signatureSize == bytesRequired,
$"RSA_sign reported signatureSize was {signatureSize}, when {bytesRequired} was expected");
bytesWritten = signatureSize;
return(true);
}
else if (padding.Mode == RSASignaturePaddingMode.Pss)
{
RsaPaddingProcessor processor = RsaPaddingProcessor.OpenProcessor(hashAlgorithm);
SafeRsaHandle rsa = _key.Value;
int bytesRequired = Interop.Crypto.RsaSize(rsa);
if (allocateSignature)
{
Debug.Assert(destination.Length == 0);
signature = new byte[bytesRequired];
destination = signature;
}
if (destination.Length < bytesRequired)
{
bytesWritten = 0;
return(false);
}
byte[] pssRented = CryptoPool.Rent(bytesRequired);
Span <byte> pssBytes = new Span <byte>(pssRented, 0, bytesRequired);
processor.EncodePss(hash, pssBytes, KeySize);
int ret = Interop.Crypto.RsaSignPrimitive(pssBytes, destination, rsa);
CryptoPool.Return(pssRented, bytesRequired);
CheckReturn(ret);
Debug.Assert(
ret == bytesRequired,
$"RSA_private_encrypt returned {ret} when {bytesRequired} was expected");
bytesWritten = ret;
return(true);
}
throw PaddingModeNotSupported();
}
private bool TrySignHash(
ReadOnlySpan <byte> hash,
Span <byte> destination,
HashAlgorithmName hashAlgorithm,
RSASignaturePadding padding,
bool allocateSignature,
out int bytesWritten,
out byte[]?signature)
{
Debug.Assert(!string.IsNullOrEmpty(hashAlgorithm.Name));
Debug.Assert(padding != null);
signature = null;
if (padding == RSASignaturePadding.Pkcs1 && padding == RSASignaturePadding.Pss)
{
throw PaddingModeNotSupported();
}
RsaPaddingProcessor processor = RsaPaddingProcessor.OpenProcessor(hashAlgorithm);
SafeRsaHandle rsa = GetKey();
int bytesRequired = Interop.AndroidCrypto.RsaSize(rsa);
if (allocateSignature)
{
Debug.Assert(destination.Length == 0);
signature = new byte[bytesRequired];
destination = signature;
}
if (destination.Length < bytesRequired)
{
bytesWritten = 0;
return(false);
}
byte[] encodedRented = CryptoPool.Rent(bytesRequired);
Span <byte> encodedBytes = new Span <byte>(encodedRented, 0, bytesRequired);
if (padding.Mode == RSASignaturePaddingMode.Pkcs1)
{
processor.PadPkcs1Signature(hash, encodedBytes);
}
else if (padding.Mode == RSASignaturePaddingMode.Pss)
{
processor.EncodePss(hash, encodedBytes, KeySize);
}
else
{
Debug.Fail("Padding mode should be checked prior to this point.");
throw PaddingModeNotSupported();
}
int ret = Interop.AndroidCrypto.RsaSignPrimitive(encodedBytes, destination, rsa);
CryptoPool.Return(encodedRented, bytesRequired);
CheckReturn(ret);
Debug.Assert(
ret == bytesRequired,
$"RsaSignPrimitive returned {ret} when {bytesRequired} was expected");
bytesWritten = ret;
return(true);
}
public override bool TrySignHash(ReadOnlySpan <byte> hash, Span <byte> destination, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding, out int bytesWritten)
{
if (string.IsNullOrEmpty(hashAlgorithm.Name))
{
throw HashAlgorithmNameNullOrEmpty();
}
if (padding == null)
{
throw new ArgumentNullException(nameof(padding));
}
RsaPaddingProcessor processor = null;
if (padding.Mode == RSASignaturePaddingMode.Pss)
{
processor = RsaPaddingProcessor.OpenProcessor(hashAlgorithm);
}
else if (padding != RSASignaturePadding.Pkcs1)
{
throw new CryptographicException(SR.Cryptography_InvalidPaddingMode);
}
SecKeyPair keys = GetKeys();
if (keys.PrivateKey == null)
{
throw new CryptographicException(SR.Cryptography_CSP_NoPrivateKey);
}
int keySize = KeySize;
int rsaSize = RsaPaddingProcessor.BytesRequiredForBitCount(keySize);
if (processor == null)
{
Interop.AppleCrypto.PAL_HashAlgorithm palAlgId =
PalAlgorithmFromAlgorithmName(hashAlgorithm, out int expectedSize);
if (hash.Length != expectedSize)
{
// Windows: NTE_BAD_DATA ("Bad Data.")
// OpenSSL: RSA_R_INVALID_MESSAGE_LENGTH ("invalid message length")
throw new CryptographicException(
SR.Format(
SR.Cryptography_BadHashSize_ForAlgorithm,
hash.Length,
expectedSize,
hashAlgorithm.Name));
}
if (destination.Length < rsaSize)
{
bytesWritten = 0;
return(false);
}
return(Interop.AppleCrypto.TryGenerateSignature(
keys.PrivateKey,
hash,
destination,
palAlgId,
out bytesWritten));
}
Debug.Assert(padding.Mode == RSASignaturePaddingMode.Pss);
if (destination.Length < rsaSize)
{
bytesWritten = 0;
return(false);
}
byte[] rented = ArrayPool <byte> .Shared.Rent(rsaSize);
Span <byte> buf = new Span <byte>(rented, 0, rsaSize);
processor.EncodePss(hash, buf, keySize);
try
{
return(Interop.AppleCrypto.TryRsaSignaturePrimitive(keys.PrivateKey, buf, destination, out bytesWritten));
}
finally
{
CryptographicOperations.ZeroMemory(buf);
ArrayPool <byte> .Shared.Return(rented);
}
}