private void start_button_Click(object sender, RoutedEventArgs e)
{
DES des = new DES();
Blocks blocks = new Blocks();
bool encryptOrDecrypt = false;
string filepath = Filepath.Text;
string keyValue = keyword.Text;
string currentDir = "";
string currentName = "";
string workGroup_1 = $@"{currentDir}\{currentName}";
string workGroup_2 = "";
string workGroup_3 = "";
string endpointText = "";
string message, title, defaultValue;
object fileName;
int mLength = 0;
int zeroBits = 0;
int length = 0;
int count = 0;
int ammoutOfRounds = 16;
try
{
currentDir = Path.GetDirectoryName(filepath);
currentName = Path.GetFileName(filepath);
}
catch (Exception)
{
MessageBox.Show("No such file!", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
return;
}
byte[] binaryBits = blocks.GetBinaryBits(filepath);
byte[] key = blocks.GetKey(keyValue);
byte[] currentBlock = new byte[64];
byte[,] blockText = blocks.DoBlocks(binaryBits, out mLength, out zeroBits);
byte[,] addedBlock = blocks.AddBlcok(blockText, zeroBits, mLength);
byte[] endpointBlock;
byte[] correctedMatrix;
byte[] readyBytes;
if (radiobutton_encrypt.IsChecked == true)
{
encryptOrDecrypt = true;
length = mLength + 1;
}
else if (radiobutton_decrypt.IsChecked == true)
{
encryptOrDecrypt = false;
length = mLength;
}
for (int i = 0; i < length; i++)
{
for (int j = 0; j < 64; j++)
{
if (radiobutton_encrypt.IsChecked == true)
{
currentBlock[j] = addedBlock[i, count];
}
else if (radiobutton_decrypt.IsChecked == true)
{
currentBlock[j] = blockText[i, count];
}
count++;
}
count = 0;
des.Rounds(ammoutOfRounds, key, currentBlock, encryptOrDecrypt, out endpointBlock);
foreach (byte t in endpointBlock)
{
endpointText += t.ToString();
}
}
if (radiobutton_decrypt.IsChecked == true)
{
try
{
correctedMatrix = blocks.DoCorrection(endpointText);
endpointText = "";
foreach (byte t in correctedMatrix)
{
endpointText += t.ToString();
}
}
catch (Exception)
{
Interaction.MsgBox("Wrong key word!!!", MsgBoxStyle.OkOnly | MsgBoxStyle.Information, "Error");
return;
}
}
readyBytes = blocks.ReverseByte(endpointText);
if (radiobutton_encrypt.IsChecked == true)
{
message = "Please input filename:";
title = "DES encryption";
defaultValue = "Encrypted message.txt";
fileName = Interaction.InputBox(message, title, defaultValue);
workGroup_2 = $@"{currentDir}\{(string)fileName}";
if ((string)fileName != "")
{
File.WriteAllBytes(workGroup_2, readyBytes);
}
MessageBox.Show($"File has been encrypted successfully!\nFilepath:{workGroup_2}", "Success!", MessageBoxButton.OK, MessageBoxImage.Information);
}
else if (radiobutton_decrypt.IsChecked == true)
{
message = "Please input new filename:";
title = "DES encryption";
defaultValue = "Decrypted message.txt";
fileName = Interaction.InputBox(message, title, defaultValue);
workGroup_3 = $@"{currentDir}\{(string)fileName}";
if ((string)fileName != "")
{
File.WriteAllBytes(workGroup_3, readyBytes);
}
MessageBox.Show($"File has been decrypted successfully!\nFilepath:{workGroup_3}", "Success!", MessageBoxButton.OK, MessageBoxImage.Information);
}
}
