public SharedObject encrypt(SharedObject inputObject)
{
string[] subKeys = createSubkeys(Utility.String2HexArray(inputObject.Key, 16)[0]);
/* Convert the string into hexadecimal form and split it as 16 character hex.
* If the splitted string is not of 16 character it right pads with 0 */
string[] hexDataArray = Utility.String2HexArray(inputObject.PlainText, 16);
string encryptedData = "";
string encyptedBlock = "";
string inputVector = "";
for (int i = 0; i < hexDataArray.Length; i++)
{
if (inputObject.Mode == 1)
{
if (i == 0)
{
inputVector = Utility.String2HexArray(inputObject.InputVector, 16)[0];
hexDataArray[i] = Utility.Binary2Hex(Utility.XORBinaryString(Utility.Hex2Binary(hexDataArray[i]),Utility.Hex2Binary(inputVector)));
}
else hexDataArray[i] = Utility.Binary2Hex(Utility.XORBinaryString(Utility.Hex2Binary(hexDataArray[i]), Utility.Hex2Binary(encyptedBlock)));
}
encyptedBlock = encodeData(hexDataArray[i], subKeys);
encryptedData += encyptedBlock;
}
SharedObject resultObject = new SharedObject();
resultObject.PlainText = inputObject.PlainText;
resultObject.CipherText = encryptedData;
resultObject.InputVector = Utility.Hex2String(inputVector);
Logger.Log(this.GetType(), "Encrypted Data" + encryptedData);
return resultObject;
}
private void btnDecrypt_Click(object sender, EventArgs e)
{
txtPlain.Text = "";
if (string.IsNullOrWhiteSpace(txtCypher.Text) || string.IsNullOrWhiteSpace(txtKey.Text))
{
MessageBox.Show("Please enter the Plain text and the Key for encryption.");
return;
}
if (txtKey.Text.Length < 8)
{
MessageBox.Show("Key is too short.Should be of length 8");
txtKey.Focus();
return;
}
if (comboModes.SelectedIndex == 1 && string.IsNullOrWhiteSpace(txtInputVector.Text))
{
MessageBox.Show("Please enter the Input Vector(IV) for CBC Mode.");
txtInputVector.Focus();
return;
}
toolStripProgressBar1.Style = ProgressBarStyle.Marquee;
toolStripProgressBar1.MarqueeAnimationSpeed = 30;
toolStripProgressBar1.Visible = true;
SharedObject sharedObject = new SharedObject();
sharedObject.Algorithm = sltAlgorithm.SelectedIndex;
sharedObject.Mode = comboModes.SelectedIndex;
sharedObject.PlainText = txtPlain.Text;
sharedObject.CipherText = txtCypher.Text;
sharedObject.InputVector = txtInputVector.Text;
sharedObject.Key = txtKey.Text;
sharedObject.IsEncrypt = false;
backgroundWorkerThreadOne.RunWorkerAsync(sharedObject);
}
public SharedObject decrypt(SharedObject inputObject)
{
string[] subKeys = createSubkeys(Utility.String2HexArray(inputObject.Key, 16)[0]);
Array.Reverse(subKeys);
/* Convert the string into hexadecimal form and split it as 16 character hex.
* If the splitted string is not of 16 character it right pads with 0 */
string[] hexDataArray = Regex.Replace(inputObject.CipherText, @"(.{16})", "$1 ").Split(new char[]{' '}, StringSplitOptions.RemoveEmptyEntries);
/* To Test hexDataArray = new string[]{"0123456789ABCDEF"};*/
string decryptedData = "";
string decryptedBlock = "";
string inputVector = "";
for (int i = 0; i < hexDataArray.Length; i++)
{
decryptedBlock = encodeData(hexDataArray[i], subKeys);
if (inputObject.Mode == 1)
{
if (i == 0)
{
inputVector = Utility.String2HexArray(inputObject.InputVector, 16)[0];
decryptedBlock = Utility.XORBinaryString(Utility.Hex2Binary(decryptedBlock), Utility.Hex2Binary(inputVector));
}
else
decryptedBlock = Utility.XORBinaryString(Utility.Hex2Binary(hexDataArray[i-1]), Utility.Hex2Binary(decryptedBlock));
}
decryptedData += Utility.Binary2Hex(decryptedBlock);
}
SharedObject resultObject = new SharedObject();
resultObject.PlainText = Utility.Hex2String(decryptedData);
resultObject.CipherText = inputObject.PlainText;
Logger.Log(this.GetType(), "Decrypted Data" + decryptedData);
return resultObject;
}
private void DoWork(object sender, DoWorkEventArgs doWorkEventArgs)
{
DateTime begin = DateTime.UtcNow;
SharedObject sharedObject = doWorkEventArgs.Argument as SharedObject;
SharedObject resultObject = new SharedObject();
switch (sharedObject.Algorithm)
{
case 1:
DESAlgorithm des = new DESAlgorithm();
if (sharedObject.IsEncrypt)
resultObject = des.encrypt(sharedObject);
else resultObject = des.decrypt(sharedObject);
break;
case 2: break;
case 3: break;
}
DateTime end = DateTime.UtcNow;
resultObject.TimeTaken = (end - begin).ToString("c");
resultObject.IsEncrypt = sharedObject.IsEncrypt;
doWorkEventArgs.Result = resultObject;
}