public void Decrypt()
{
if (this.inputStream != null)
{
// Decrypt Stream
try
{
SymmetricAlgorithm p_alg = new PresentManaged();
ConfigureAlg(p_alg, true);
ICryptoolStream inputdata = InputStream;
CStreamReader reader = inputdata.CreateReader();
ICryptoTransform p_decryptor = p_alg.CreateDecryptor();
outputStream = new CStreamWriter();
p_crypto_stream_dec = new CryptoStream((Stream)reader, p_decryptor, CryptoStreamMode.Read);
byte[] buffer = new byte[p_alg.BlockSize / 8];
int bytesRead;
int position = 0;
DateTime startTime = DateTime.Now;
while ((bytesRead = p_crypto_stream_dec.Read(buffer, 0, buffer.Length)) > 0 && !stop)
{
outputStream.Write(buffer, 0, bytesRead);
if ((int)(reader.Position * 100 / inputStream.Length) > position)
{
position = (int)(reader.Position * 100 / inputStream.Length);
Progress(reader.Position, inputStream.Length);
}
}
p_crypto_stream_dec.Flush();
p_crypto_stream_dec.Close();
DateTime stopTime = DateTime.Now;
TimeSpan duration = stopTime - startTime;
outputStream.Close();
if (settings.Action == 1)
{
outputStream = BlockCipherHelper.StripPadding(outputStream, settings.padmap[settings.Padding], p_alg.BlockSize / 8) as CStreamWriter;
}
if (!stop)
{
GuiLogMessage("Decryption complete! (in: " + inputStream.Length.ToString() + " bytes, out: " + outputStream.Length.ToString() + " bytes)", NotificationLevel.Info);
GuiLogMessage("Time used: " + duration.ToString(), NotificationLevel.Debug);
OnPropertyChanged("OutputStream");
}
else
{
GuiLogMessage("Aborted!", NotificationLevel.Info);
}
}
catch (CryptographicException cryptographicException)
{
// TODO: For an unknown reason p_crypto_stream can not be closed after exception.
// Trying so makes p_crypto_stream throw the same exception again. So in Dispose
// the error messages will be doubled.
// As a workaround we set p_crypto_stream to null here.
p_crypto_stream_dec = null;
GuiLogMessage(cryptographicException.Message, NotificationLevel.Error);
}
catch (Exception exception)
{
GuiLogMessage(exception.Message, NotificationLevel.Error);
}
finally
{
Progress(1, 1);
}
}
}
public void Encrypt()
{
if (this.inputStream != null)
{
// Encrypt Stream
try
{
SymmetricAlgorithm p_alg = new PresentManaged();
ConfigureAlg(p_alg, true);
ICryptoolStream inputdata = InputStream;
inputdata = BlockCipherHelper.AppendPadding(InputStream, settings.padmap[settings.Padding], p_alg.BlockSize / 8);
CStreamReader reader = inputdata.CreateReader();
if ((this.presentation != null) & (p_alg.KeySize == 80))
{
byte[] block = new byte[8];
byte[] key = (byte[])p_alg.Key.Clone();
int r = reader.Read(block, 0, 8);
if (reader.CanSeek)
{
reader.Position = 0;
}
if (r < 8)
{
for (int i = 0; i < r; i++)
{
block[7 - i] = block[r - i - 1];
}
byte p;
if (p_alg.Padding == PaddingMode.PKCS7)
{
p = (byte)(8 - r);
}
else
{
p = (byte)0;
}
for (int i = 0; i < 8 - r; i++)
{
block[i] = p;
}
}
this.presentation.Assign_Values(key, block);
}
ICryptoTransform p_encryptor = p_alg.CreateEncryptor();
outputStream = new CStreamWriter();
p_crypto_stream_enc = new CryptoStream((Stream)reader, p_encryptor, CryptoStreamMode.Read);
byte[] buffer = new byte[p_alg.BlockSize / 8];
int bytesRead;
int position = 0;
DateTime startTime = DateTime.Now;
while ((bytesRead = p_crypto_stream_enc.Read(buffer, 0, buffer.Length)) > 0 && !stop)
{
outputStream.Write(buffer, 0, bytesRead);
if ((int)(reader.Position * 100 / inputStream.Length) > position)
{
position = (int)(reader.Position * 100 / inputStream.Length);
Progress(reader.Position, inputStream.Length);
}
}
p_crypto_stream_enc.Flush();
// p_crypto_stream_enc.Close();
DateTime stopTime = DateTime.Now;
TimeSpan duration = stopTime - startTime;
outputStream.Close();
if (!stop)
{
GuiLogMessage("Encryption complete! (in: " + inputStream.Length.ToString() + " bytes, out: " + outputStream.Length.ToString() + " bytes)", NotificationLevel.Info);
GuiLogMessage("Time used: " + duration.ToString(), NotificationLevel.Debug);
OnPropertyChanged("OutputStream");
}
else
{
GuiLogMessage("Aborted!", NotificationLevel.Info);
}
}
catch (CryptographicException cryptographicException)
{
// TODO: For an unknown reason p_crypto_stream can not be closed after exception.
// Trying so makes p_crypto_stream throw the same exception again. So in Dispose
// the error messages will be doubled.
// As a workaround we set p_crypto_stream to null here.
p_crypto_stream_enc = null;
GuiLogMessage(cryptographicException.Message, NotificationLevel.Error);
}
catch (Exception exception)
{
GuiLogMessage(exception.Message, NotificationLevel.Error);
}
finally
{
Progress(1, 1);
}
}
}
