public byte[] Decode(byte[] input)
{
var output = new List <byte>();
var countBlock = Math.Ceiling((double)input.Length / _sizeBlock);
for (var i = 0; i < countBlock; i++)
{
var cipherRegistr = _aes.Encrypt(_shiftRegistr.ToArray());
for (var j = 0; j < _sizeBlock; j++)
{
var index = i * _sizeBlock + j;
if (index >= input.Length)
{
break;
}
var currentByte = cipherRegistr[j];
output.Add((byte)(input[index] ^ currentByte));
_shiftRegistr.RemoveAt(0);
_shiftRegistr.Add(currentByte);
}
}
return(output.ToArray());
}
private void ButtonExecute_Click(object sender, RoutedEventArgs e)
{
Encrypted.Text = "";
Info.Text = "";
int keySize = 16;
if (Key.Text == "")
{
Key.Text = "Key can`t be empty!!!";
return;
}
if ((bool)Aes128.IsChecked)
{
Aes.setNk(4);
}
else if ((bool)Aes192.IsChecked)
{
Aes.setNk(6);
keySize = 24;
}
else if ((bool)Aes256.IsChecked)
{
Aes.setNk(8);
keySize = 32;
}
byte[] key = CreateKey(Key.Text, keySize);
//-------------------------------------------------------------------
byte[] buff = new byte[uncrypted.Length];
char[] c = uncrypted.ToArray();
for (int i = 0; i < c.Count(); i++)
{
buff[i] = Convert.ToByte(c[i]);
}
if ((bool)REncrypt.IsChecked)
{
if ((bool)Report.IsChecked)
{
WaitWindow ww = new WaitWindow();
ww.Show();
encrypted = Aes.Encrypt(buff, key, ref res);
Info.Text = res;
ww.Close();
}
else
{
encrypted = Aes.Encrypt(buff, key);
}
//Encrypted field
char[] buff2 = new char[encrypted.Length];
string bufEnc = "";
for (int i = 0; i < encrypted.Count(); i++)
{
char ch = Convert.ToChar(encrypted[i]);
bufEnc += Convert.ToString(ch);
}
Encrypted.Text += bufEnc;
if ((bool)Save.IsChecked)
{
String path = Path.Text;
path += ".enc";
//---------------------------------write in file--------------------------------
try
{
using (FileStream fs = File.Open(path, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
{
fs.Write(encrypted, 0, encrypted.Count());
MessageBox.Show("Write success \n" + path);
}
}
catch (SystemException)
{
throw new SystemException();
}
}
}
else if ((bool)RDecrypt.IsChecked)
{
try
{
using (FileStream fs = File.Open(path, FileMode.Open))
{
int snipped = 0;
byte[] data = new byte[102400];
int len = fs.Read(data, 0, data.Length);
// ------copy needed info from buffer----
byte[] temp = new byte[len];
for (int i = 0; i < len; i++)
{
temp[i] = data[i];
}
//----------------------------------------
//decrypton
byte[] decrypted = Aes.Decrypt(temp, key);
// find last block
if (data[len - 16] == 0x1)
{
snipped = decrypted[decrypted.Count() - 17];
if (snipped > 16)
{
snipped = 16;
}
}
else
{
snipped = 0;
}
//---------------------------------------
char[] dataChar = new char[(decrypted.Count() - 32) + snipped];
for (int i = 0; i < dataChar.Count(); i++)
{
dataChar[i] = Convert.ToChar(decrypted[i]);
}
uncrypted = new String(dataChar);
Source.Text = "File Size: " + uncrypted.Length.ToString() + "\n";
Source.Text += uncrypted;
//output encoded
}
}
catch (FileNotFoundException)
{
Path.Text = "File not found!";
}
catch (ArgumentException)
{
Path.Text = "Path is empty!";
}
catch (DirectoryNotFoundException)
{
Path.Text = "Directory not found!";
}
}
}