/// <summary>
/// Encrypt multiple blocks of data in CFB (Cipher Feedback Mode) and Zero-Padding.
/// </summary>
/// <param name="input"> plaintext bytes </param>
/// <param name="output"> Encrypted bytes whereas first 8 bytes are the initialization vector</param>
public void EncryptData(byte[] input, out byte[] output)
{
PrepareData(ref input, out var inputBuffer, out output);
byte[] encryptIn = new byte[bSize];
var algorithm = new Lambda1(key, OperationMode.Encrypt);
for (int i = 0, j = 1; j < output.Length / bSize; ++i, ++j)
{
CopyChunk(ref encryptIn, 0, ref output, i * bSize, bSize);
algorithm.ProcessBlock(encryptIn, out var encryptOut);
CopyChunk(ref output, j * bSize, ref encryptOut, 0, bSize);
XorChunk(ref output, j * bSize, ref inputBuffer, j * bSize, bSize);
}
}
/// <summary>
/// Decrypt multiple blocks of data in CFB (Cipher Feedback Mode) and Zero-Padding.
/// The padding is NOT stripped.
/// </summary>
/// <param name="input"> Encrypted buffer whereas first 8 bytes are the initialization vector </param>
/// <param name="output"> Decrypted bytes </param>
public void DecryptData(byte[] input, out byte[] output)
{
byte[] outputBuffer = new byte[input.Length - bSize];
byte[] decryptIn = new byte[bSize];
var algorithm = new Lambda1(key, OperationMode.Encrypt);
for (int i = 0, j = 1; j < input.Length / bSize; ++i, ++j)
{
CopyChunk(ref decryptIn, 0, ref input, i * bSize, bSize);
algorithm.ProcessBlock(decryptIn, out var decryptOut);
CopyChunk(ref outputBuffer, i * bSize, ref decryptOut, 0, bSize);
XorChunk(ref outputBuffer, i * bSize, ref input, j * bSize, bSize);
}
output = outputBuffer;
}
