/// <summary>
/// Bitwise encryption
/// </summary>
/// <param name="input"></param>
/// <param name="inOff"></param>
/// <param name="length"></param>
/// <param name="output"></param>
/// <param name="outOff"></param>
/// <param name="N">input length in bits to encrypt</param>
public void ProcessBits(
byte[] input,
int inOff,
int length,
byte[] output,
int outOff,
int N)
{
//int bytesWritten = ProcessBytes(input, inOff, length, output, outOff);
////Console.WriteLine("input: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(input));
////Console.WriteLine("output: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(output));
////Console.WriteLine(bufOff);
////Console.WriteLine("buffer: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
//int significantBits = N % 8;
//Console.WriteLine(significantBits);
////DoFinal
//try
//{
// if (bufOff != 0)
// {
// Check.DataLength(!cipher.IsPartialBlockOkay, "data not block size aligned");
// Check.OutputLength(output, outOff, bufOff, "output buffer too short for DoFinal()");
// Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// //Shifting last byte left on number of significant bits
// buf[bufOff - 1] <<= 4;
// Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// cipher.ProcessBlock(buf, 0, buf, 0);
// Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// //Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// //Console.WriteLine(significantBits);
// //Console.WriteLine(maskLookUp[8 - significantBits]);
// //Masking insignificant bits in last byte
// //buf[bufOff - 1] &= maskLookUp[8 - significantBits];
// buf[bufOff - 1] &= 0xf0;
// //Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// //Shifting last byte back
// buf[bufOff - 1] >>= 4;
// //Console.WriteLine("buf: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(buf));
// Array.Copy(buf, 0, output, bytesWritten, bufOff);
// //Console.WriteLine("output: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(output));
// }
//}
//finally
//{
// Reset();
//}
int bytesWritten = ProcessBytes(input, inOff, length, output, outOff);
//Console.WriteLine("output: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(output));
int N_ = N % (cipher.GetBlockSize() * 8);
try
{
if (bufOff != 0)
{
Check.DataLength(!cipher.IsPartialBlockOkay, "data not block size aligned");
Check.OutputLength(output, outOff, bufOff, "output buffer too short for DoFinal()");
Array.Clear(temp, 0, temp.Length);
cipher.ProcessBlock(temp, 0, temp, 0);
//Console.WriteLine("gamma: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(temp));
BitArray bits = new BitArray(temp);
bits.FixLength(N_);
byte[] gamma = bits.GetBytes();
bits = new BitArray(buf);
bits.FixLength(N_);
byte[] lastBlockBytes = bits.GetBytes();
//Console.WriteLine("gamma: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(gamma));
//Console.WriteLine("lastBlockBytes: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(lastBlockBytes));
for (int i = 0; i < lastBlockBytes.Length; i++)
{
lastBlockBytes[i] ^= gamma[i];
}
bits = new BitArray(lastBlockBytes);
//Shifting non-significant bits
bits = bits.ShiftLeft(8 - N % 8);
//Console.WriteLine(bits.ToString());
lastBlockBytes = bits.GetBytes();
//Console.WriteLine("lastBlockBytes: " + Org.BouncyCastle.Utilities.Encoders.Hex.ToHexString(lastBlockBytes));
Array.Copy(lastBlockBytes, 0, output, bytesWritten, lastBlockBytes.Length);
}
}
finally
{
Reset();
}
}
