public static string DecryptPassword(string password, string odbiorca)
{
var data = FileMy.PobranieDanychZPliku(odbiorca);
var cryptoData = RC6.OdszyfrowywanieRc6Password(data, password);
try
{
return(Encoding.ASCII.GetString(cryptoData));
}
catch (Exception)
{
return(null);
}
}
public static void OdszyfrowywanieRc6(string wejscie, string wyjscie, Odbiorcy odbiorca, NaglowekPliku naglowek, MainWindow window)
{
//data
var reader2 = new StreamReader(wejscie);
var reader = new FileMy(reader2);
while (true)
{
var searcher = reader.ReadLine();
if (searcher != null && searcher.StartsWith("</EnctyptedFileHeader>"))
break;
}
var position = reader.Position;
reader.Close();
var entry = new FileStream(wejscie, FileMode.Open)
{
Position = position
};
var exit = new System.IO.FileStream(wyjscie, FileMode.Create);
//decrypt
var blockCipher = CreateCipher(naglowek.Tryb, naglowek.WielkoscPodBloku);
ICipherParameters parameters;
if (naglowek.Tryb == "ECB")
parameters = new KeyParameter(odbiorca.KluczSesyjny);
else
parameters = new ParametersWithIV(new KeyParameter(odbiorca.KluczSesyjny), naglowek.Iv);
blockCipher.Init(false, parameters);
//date for progresbar
long lenghtFile = entry.Length;
double progres = lenghtFile / 1000;
long actuallyLenght = 0;
//date for encrypt
var buffer = new byte[16];
var outputBytes = new byte[blockCipher.GetOutputSize(buffer.Length)];
var length = 0;
int bytesRead;
while ((bytesRead = entry.Read(buffer, 0, buffer.Length)) > 0)
{
length = blockCipher.ProcessBytes(buffer, 0, bytesRead, outputBytes, 0);
exit.Write(outputBytes, 0, length);
//progresbar
actuallyLenght += bytesRead;
if (actuallyLenght > progres)
{
window.progressBarOdszyfrowywanie.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
new Action(
delegate()
{
window.progressBarOdszyfrowywanie.Value += 0.1;
}
));
actuallyLenght -= (long) progres;
}
}
length = blockCipher.DoFinal(outputBytes, 0);
exit.Write(outputBytes, 0, length);
entry.Close();
exit.Close();
}
