private void btnEncrypt_Click(object sender, EventArgs e)
{
// make sure the user has entered a plain text message
if (txtPlainText.Text != "" && txtPlainText.Text != " ")
{
int cipher = cboCipher.SelectedIndex;
string plainText = txtPlainText.Text;
string cipherText = null;
// instantiate the class for the selected cipher, declare and assign value
// to a key variable if neccesary, call the encrypt method
switch (cipher)
{
case 0:
HashFunction hash = new HashFunction();
cipherText = hash.EncrpytHash(plainText);
break;
case 1:
Caesar caesar = new Caesar();
try
{
int cKey = Convert.ToInt32(txtKey.Text);
cipherText = caesar.EncrpytCaesar(plainText, cKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 2:
try {
RailFence railFence = new RailFence();
int rKey = Convert.ToInt32(txtKey.Text);
cipherText = railFence.encryptRailFence(plainText, rKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 3:
Polybius polybius = new Polybius();
cipherText = polybius.encryptPoly(plainText);
break;
case 4:
try
{
Gronsfeld gronsfeld = new Gronsfeld();
int gKey = Convert.ToInt32(txtKey.Text);
cipherText = gronsfeld.encryptGronsfeld(plainText, gKey);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 5:
FourSquare fourSquare = new FourSquare();
cipherText = fourSquare.encryptFourSquare(plainText);
break;
}
// ensure that the message was encrypted
if (cipherText != null)
{
txtCipherText.Text = cipherText;
}
}
else
{
MessageBox.Show("Please enter a message to encrypt");
}
}
private void btnDecrpyt_Click(object sender, EventArgs e)
{
// make sure the user has entered a cipher text message
int cipher = cboCipher.SelectedIndex;
int key = 0;
string plainText = null;
string cipherText = txtCipherText.Text;
// instantiate the class for the selected cipher, declare and assign value
// to a key variable if neccesary, call the decrypt method
switch (cipher)
{
case 0:
MessageBox.Show("Hash functions cannot be decrypted");
break;
case 1:
try {
Caesar dCaesar = new Caesar();
key = Convert.ToInt32(txtKey.Text);
plainText = dCaesar.EncrpytCaesar(cipherText, -key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 2:
try {
RailFence dRailFence = new RailFence();
key = Convert.ToInt32(txtKey.Text);
plainText = dRailFence.decryptRailFence(cipherText, key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
case 3:
Polybius dPolybius = new Polybius();
plainText = dPolybius.decryptPoly(cipherText);
break;
case 4:
try {
Gronsfeld dGronsfeld = new Gronsfeld();
key = Convert.ToInt32(txtKey.Text);
plainText = dGronsfeld.encryptGronsfeld(cipherText, -key);
}
catch (FormatException)
{
// users must enter a numeric key
MessageBox.Show("Please enter a valid encryption key");
}
break;
}
// ensure that the message was decrypted
if (cipherText != null)
{
txtPlainText.Text = plainText;
}
}