public List <byte[]> Decrypt(ISymmetricCipher symmetricCipher, List <byte[]> cipherText)
{
var decryptedMessage = new byte[cipherText.Count][];
Parallel.For(0, cipherText.Count,
blockNumber =>
{
var currentBlock = blockNumber > 0 ? cipherText[blockNumber - 1] : InitializationVector;
var decryptdData = symmetricCipher.Encrypt(currentBlock);
var openText = CipherUtils.XorByteArrays(decryptdData, cipherText[blockNumber]);
decryptedMessage[blockNumber] = openText;
});
return(decryptedMessage.ToList());
}
public List <byte[]> Encrypt(ISymmetricCipher symmetricCipher, List <byte[]> openText)
{
var c = InitializationVector;
var encryptedMessage = new List <byte[]>();
foreach (var messageBlock in openText)
{
var encryptedBlock = symmetricCipher.Encrypt(c);
var xoredBlock = CipherUtils.XorByteArrays(encryptedBlock, messageBlock);
c = xoredBlock;
encryptedMessage.Add(xoredBlock);
}
return(encryptedMessage);
}
private List <byte[]> EncryptionConvertion(ISymmetricCipher symmetricCipher, List <byte[]> cipherText)
{
var c = InitializationVector;
var encryptedMessage = new byte[cipherText.Count][];
for (int i = 0; i < encryptedMessage.Length; i++)
{
encryptedMessage[i] = symmetricCipher.Encrypt(c);
c = encryptedMessage[i];
}
Parallel.For(0, encryptedMessage.Length,
blockNumber => encryptedMessage[blockNumber] = CipherUtils.XorByteArrays(cipherText[blockNumber], encryptedMessage[blockNumber]));
return(encryptedMessage.ToList());
}