private static UniversalCryptoTransform CreateTransformCore(
CipherMode cipherMode,
PaddingMode paddingMode,
byte[] key,
byte[]?iv,
int blockSize,
int paddingSize,
int feedbackSize,
bool encrypting)
{
SafeAlgorithmHandle algorithm = AesBCryptModes.GetSharedHandle(cipherMode, feedbackSize);
BasicSymmetricCipher cipher = new BasicSymmetricCipherBCrypt(algorithm, cipherMode, blockSize, paddingSize, key, false, iv, encrypting);
return(UniversalCryptoTransform.Create(paddingMode, cipher, encrypting));
}
private static UniversalCryptoTransform CreateTransformCore(
CipherMode cipherMode,
PaddingMode paddingMode,
byte[] key,
byte[]?iv,
int blockSize,
int feedbackSize,
int paddingSize,
bool encrypting)
{
using (SafeAlgorithmHandle algorithm = RC2BCryptModes.GetHandle(cipherMode, key.Length * 8))
{
// The BasicSymmetricCipherBCrypt ctor will increase algorithm reference count and take ownership.
BasicSymmetricCipher cipher = new BasicSymmetricCipherBCrypt(algorithm, cipherMode, blockSize, paddingSize, key, true, iv, encrypting);
return(UniversalCryptoTransform.Create(paddingMode, cipher, encrypting));
}
}
private UniversalCryptoTransform CreateEphemeralCryptoTransformCore(byte[] key, byte[]?iv, bool encrypting, PaddingMode padding, CipherMode mode, int feedbackSizeInBits)
{
int blockSizeInBytes = AsymmetricAlgorithmHelpers.BitsToBytes(_outer.BlockSize);
SafeAlgorithmHandle algorithmModeHandle = _outer.GetEphemeralModeHandle(mode, feedbackSizeInBits);
BasicSymmetricCipher cipher = new BasicSymmetricCipherBCrypt(
algorithmModeHandle,
mode,
blockSizeInBytes,
_outer.GetPaddingSize(mode, feedbackSizeInBits),
key,
ownsParentHandle: false,
iv,
encrypting);
return(UniversalCryptoTransform.Create(padding, cipher, encrypting));
}