public override void ViewDidLoad()
{
string SQLitePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "cryptedDb.db3");
base.ViewDidLoad();
SaveButton.TouchUpInside += (sender, e) =>
{
currentTask.Name = TitleText.Text;
currentTask.Notes = NotesText.Text;
currentTask.Done = DoneSwitch.On;
CryptDelegate.SaveTask(currentTask);
UpdateData(SQLitePath);
};
DeleteButton.TouchUpInside += (sender, e) =>
{
CryptDelegate.DeleteTask(currentTask);
DeleteData(SQLitePath);
};
}
private void process(int action, int padding)
{
//Encrypt/Decrypt Stream
try
{
if (InputStream == null || InputStream.Length == 0)
{
GuiLogMessage("No input data, aborting now", NotificationLevel.Error);
return;
}
byte[] inputbuffer = new byte[8];
byte[] outputbuffer = new byte[8];
uint[] key = new uint[4];
long[] longKey = new long[4];
long keybytes = inputKey.Length;
GuiLogMessage("inputKey length [byte]: " + keybytes.ToString(), NotificationLevel.Debug);
if (keybytes != 16)
{
GuiLogMessage("Given key has false length. Please provide a key with 128 Bits length. Aborting now.", NotificationLevel.Error);
return;
}
if (settings.Version != 2)
{
key[0] = BitConverter.ToUInt32(inputKey, 0);
key[1] = BitConverter.ToUInt32(inputKey, 4);
key[2] = BitConverter.ToUInt32(inputKey, 8);
key[3] = BitConverter.ToUInt32(inputKey, 12);
}
else
{
longKey[0] = (long)BitConverter.ToUInt32(inputKey, 0);
longKey[1] = (long)BitConverter.ToUInt32(inputKey, 4);
longKey[2] = (long)BitConverter.ToUInt32(inputKey, 8);
longKey[3] = (long)BitConverter.ToUInt32(inputKey, 12);
}
//check for a valid IV
if (this.inputIV == null)
{
//create a trivial IV
inputIV = new byte[8];
if (settings.Mode != 0)
{
GuiLogMessage("WARNING - No IV provided. Using 0x000..00!", NotificationLevel.Warning);
}
}
byte[] IV = new byte[8];
Array.Copy(inputIV, IV, Math.Min(inputIV.Length, IV.Length));
DateTime startTime = DateTime.Now;
uint[] vector = new uint[2];
long[] longVector = new long[2];
CryptDelegate crypfunc = delegates[settings.Action * 3 + settings.Version];
StatusChanged((int)teaimages[settings.Action * 3 + settings.Version]);
outputStream = new CStreamWriter();
ICryptoolStream inputdata = InputStream;
if (action == 0)
{
inputdata = BlockCipherHelper.AppendPadding(InputStream, settings.padmap[settings.Padding], 8);
}
CStreamReader reader = inputdata.CreateReader();
GuiLogMessage("Starting " + ((action == 0)?"encryption":"decryption") + " [Keysize=128 Bits, Blocksize=64 Bits]", NotificationLevel.Info);
if (settings.Mode == 0) // ECB
{
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
Bytes2Vector(vector, inputbuffer);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
outputStream.Write(outputbuffer);
}
}
else if (settings.Mode == 1) // CBC
{
if (settings.Action == 0)
{
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
for (int i = 0; i < 8; i++)
{
inputbuffer[i] ^= IV[i];
}
Bytes2Vector(vector, inputbuffer);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
for (int i = 0; i < 8; i++)
{
IV[i] = outputbuffer[i];
}
outputStream.Write(outputbuffer);
}
}
else
{
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
Bytes2Vector(vector, inputbuffer);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
for (int i = 0; i < 8; i++)
{
outputbuffer[i] ^= IV[i];
}
for (int i = 0; i < 8; i++)
{
IV[i] = inputbuffer[i];
}
outputStream.Write(outputbuffer);
}
}
}
else if (settings.Mode == 2) // CFB
{
if (settings.Action == 0)
{
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
Bytes2Vector(vector, IV);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
for (int i = 0; i < 8; i++)
{
outputbuffer[i] ^= inputbuffer[i];
}
for (int i = 0; i < 8; i++)
{
IV[i] = outputbuffer[i];
}
outputStream.Write(outputbuffer);
}
}
else
{
crypfunc = delegates[settings.Version]; // choose encrypt function
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
Bytes2Vector(vector, IV);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
for (int i = 0; i < 8; i++)
{
outputbuffer[i] ^= inputbuffer[i];
}
for (int i = 0; i < 8; i++)
{
IV[i] = inputbuffer[i];
}
outputStream.Write(outputbuffer);
}
}
}
else if (settings.Mode == 3) // OFB - encrypt = decrypt
{
crypfunc = delegates[settings.Version]; // choose encrypt function
while (reader.Read(inputbuffer, 0, inputbuffer.Length) > 0 && !stop)
{
Bytes2Vector(vector, IV);
crypfunc(settings.Rounds, vector, key);
Vector2Bytes(vector, outputbuffer);
for (int i = 0; i < 8; i++)
{
IV[i] = outputbuffer[i];
}
for (int i = 0; i < 8; i++)
{
outputbuffer[i] ^= inputbuffer[i];
}
outputStream.Write(outputbuffer);
}
}
long outbytes = outputStream.Length;
DateTime stopTime = DateTime.Now;
TimeSpan duration = stopTime - startTime;
outputStream.Close();
if (action == 1)
{
outputStream = BlockCipherHelper.StripPadding(outputStream, settings.padmap[settings.Padding], 8) as CStreamWriter;
}
if (!stop)
{
GuiLogMessage("Time used: " + duration.ToString(), NotificationLevel.Debug);
OnPropertyChanged("OutputStream");
}
else
{
GuiLogMessage("Aborted!", NotificationLevel.Info);
}
}
catch (Exception exception)
{
GuiLogMessage(exception.Message, NotificationLevel.Error);
}
finally
{
ProgressChanged(1, 1);
}
}
