private void Reset()
{
try
{
stop = false;
inputKey = null;
outputStream = null;
if (outputStream != null)
{
outputStream.Flush();
outputStream.Close();
outputStream.Dispose();
outputStream = null;
}
}
catch (Exception ex)
{
GuiLogMessage(ex.Message, NotificationLevel.Error);
}
}
/// <summary>
/// Called every time this plugin is run in the workflow execution.
/// </summary>
public void Execute()
{
ProgressChanged(0, 1);
try
{
inputStreamReader = InputStream.CreateReader();
//inputStreamReader.WaitEof();
if (!ValidateInputs())
{
return; // beende die Ausführung bei Problemen mit den Eingabedaten
}
debugDataWriter = new CStreamWriter();
if (settings.Debug)
{
WriteDebug("Starting computation ...\r\n\r\n");
WriteDebug(String.Format("mode: {0}\r\n", settings.HashMode));
if (settings.HashMode != CypherMatrixHashSettings.CypherMatrixHashMode.Mini)
{
WriteDebug(String.Format("permutation: {0}\r\n", settings.Perm));
}
else
{
WriteDebug("permutation: none\r\n");
}
WriteDebug("\r\n\r\n");
}
Stopwatch sw = new Stopwatch();
sw.Start();
Hash();
sw.Stop();
if (!stop)
{
GuiLogMessage(string.Format("Processed {0:N} KiB data in {1} ms.", (double)InputStream.Length / 1024, sw.ElapsedMilliseconds), NotificationLevel.Info);
GuiLogMessage(string.Format("Achieved data throughput: {0:N} kB/s", (double)InputStream.Length / sw.ElapsedMilliseconds), NotificationLevel.Info);
}
}
catch (Exception exception)
{
GuiLogMessage(exception.Message + "\r\n" + exception.StackTrace, NotificationLevel.Error);
if (settings.Debug)
{
WriteDebug("\r\nThe following error occurred during execution:\r\n");
WriteDebug(exception.Message + "\r\n" + exception.StackTrace + "\r\n");
}
}
finally
{
if (stop)
{
GuiLogMessage("Computation aborted!", NotificationLevel.Warning);
stop = false;
}
if (settings.Debug)
{
WriteDebug("\r\n>>>>>>>>>> END OF OPERATION <<<<<<<<<<");
}
else
{
WriteDebug("You have to enable the debug logging to see the internal variables here.");
}
debugDataWriter.Flush();
debugDataWriter.Close();
OnPropertyChanged("OutputDebug");
}
ProgressChanged(1, 1);
}
/// <summary>
/// Encrypts/Decrypts using OFB
/// </summary>
/// <param name="blockCipher"></param>
/// <param name="cipherAction"></param>
/// <param name="inputStream"></param>
/// <param name="outputStream"></param>
/// <param name="key"></param>
/// <param name="iv"></param>
/// <param name="padding"></param>
/// <param name="stop"></param>
/// <param name="progressChanged"></param>
/// <param name="lastInputBlock"></param>
/// <param name="blocksize"></param>
public static void ExecuteOFB(BlockCipher blockCipher,
CipherAction cipherAction,
ref ICrypToolStream inputStream,
ref ICrypToolStream outputStream,
byte[] key,
byte[] iv,
PaddingType padding,
ref bool stop,
ProgressChanged progressChanged,
ref byte[] lastInputBlock,
int blocksize = 8)
{
using (CStreamReader reader = inputStream.CreateReader())
{
using (CStreamWriter writer = new CStreamWriter())
{
byte[] lastBlock = iv;
int readcount = 0;
while (reader.Position < reader.Length && !stop)
{
//we always try to read a complete block
byte[] inputBlock = new byte[blocksize];
readcount = 0;
while ((readcount += reader.Read(inputBlock, readcount, blocksize - readcount)) < blocksize &&
reader.Position < reader.Length && !stop)
{
;
}
if (stop)
{
return;
}
//Show progress in UI
progressChanged(reader.Position, reader.Length);
byte[] outputblock = null;
//we read a complete block
if (readcount == blocksize)
{
//Compute XOR with lastblock for OFB mode
if (cipherAction == CipherAction.Encrypt)
{
outputblock = blockCipher(lastBlock, key);
lastBlock = outputblock;
outputblock = XOR(outputblock, inputBlock);
}
else
{
outputblock = blockCipher(lastBlock, key);
lastBlock = outputblock;
outputblock = XOR(outputblock, inputBlock);
}
}
//we read an incomplete block, thus, we are at the end of the stream
else if (readcount > 0)
{
//Compute XOR with lastblock for CFB mode
if (cipherAction == CipherAction.Encrypt)
{
byte[] block = new byte[blocksize];
Array.Copy(inputBlock, 0, block, 0, readcount);
outputblock = blockCipher(lastBlock, key);
outputblock = XOR(outputblock, block);
}
else
{
byte[] block = new byte[blocksize];
Array.Copy(inputBlock, 0, block, 0, readcount);
outputblock = blockCipher(inputBlock, key);
outputblock = XOR(outputblock, lastBlock);
}
}
//check if it is the last block and we decrypt, thus, we have to remove the padding
if (reader.Position == reader.Length && cipherAction == CipherAction.Decrypt && padding != PaddingType.None)
{
int valid = StripPadding(outputblock, blocksize, padding, blocksize);
if (valid != blocksize)
{
byte[] newoutputblock = new byte[valid];
Array.Copy(outputblock, 0, newoutputblock, 0, valid);
outputblock = newoutputblock;
}
else if (valid == 0)
{
outputblock = null;
}
}
//if we crypted something, we output it
if (outputblock != null)
{
writer.Write(outputblock, 0, outputblock.Length);
//if we wrote to the stream, we memorize the last input block for the visualization
lastInputBlock = inputBlock;
}
}
writer.Flush();
outputStream = writer;
}
}
}
/// <summary>
/// En- or decrypt input stream with ChaCha.
/// </summary>
/// <param name="key">The secret 128-bit or 256-bit key. A 128-bit key will be expanded into a 256-bit key by concatenation with itself.</param>
/// <param name="iv">Initialization vector (DJB version: 64-bit, IETF version: 96-bit)</param>
/// <param name="initialCounter">Initial counter (DJB version: 64-bit, IETF version: 32-bit)</param>
/// <param name="settings">Chosen Settings in the Plugin workspace. Includes Rounds and Version property.</param>
/// <param name="input">Input stream</param>
/// <param name="output">Output stream</param>
/// <param name="keystreamWriter">Keystream Output stream</param>
private void Xcrypt(byte[] key, byte[] iv, ulong initialCounter, ChaChaSettings settings, ICryptoolStream input, CStreamWriter output, CStreamWriter keystreamOutput)
{
if (!(key.Length == 32 || key.Length == 16))
{
throw new ArgumentOutOfRangeException("key", key.Length, "Key must be exactly 128-bit or 256-bit.");
}
if (iv.Length != settings.Version.IVBits / 8)
{
throw new ArgumentOutOfRangeException("iv", iv.Length, $"IV must be exactly {settings.Version.IVBits}-bit.");
}
void AssertCounter(ulong counter, ulong max)
{
if (!(0 <= counter && counter <= max))
{
throw new ArgumentOutOfRangeException("initialCounter", counter, $"Initial counter must be between 0 and {max}.");
}
}
if (settings.Version == Version.DJB)
{
AssertCounter(initialCounter, ulong.MaxValue);
}
else if (settings.Version == Version.IETF)
{
AssertCounter(initialCounter, uint.MaxValue);
}
// The first 512-bit state. Reused for counter insertion.
uint[] firstState = State(key, iv, initialCounter, settings.Version);
// Buffer to read 512-bit input block
byte[] inputBytes = new byte[64];
CStreamReader inputReader = input.CreateReader();
// byte size of input
long inputSize = inputReader.Length;
// one keystream block is 64 bytes (512 bit)
TotalKeystreamBlocks = (int)Math.Ceiling((double)(inputSize) / 64);
ulong blockCounter = initialCounter;
int read = inputReader.Read(inputBytes);
while (read != 0)
{
// Will hold the state during each keystream
uint[] state = (uint[])firstState.Clone();
InsertCounter(ref state, blockCounter, settings.Version);
ChaChaHash(ref state, settings.Rounds);
byte[] keystream = ByteUtil.ToByteArray(state);
keystreamOutput.Write(keystream);
byte[] c = ByteUtil.XOR(keystream, inputBytes, read);
output.Write(c);
// Don't add to InputMessage during diffusion run because it won't
// return a different list during the diffusion run.
if (!DiffusionExecution)
{
InputMessage.AddRange(inputBytes.Take(read));
}
Keystream.AddRange(keystream.Take(read));
Output.AddRange(c);
blockCounter++;
// Read next input block
read = inputReader.Read(inputBytes);
}
inputReader.Dispose();
output.Flush();
output.Close();
output.Dispose();
keystreamOutput.Flush();
keystreamOutput.Close();
keystreamOutput.Dispose();
}
