private string decryptText(string s)
{
if (lbCiphers.SelectedItem == null)
{
MessageBox.Show("Please select a cipher to use!", "Warning!");
return(null);
}
switch (lbCiphers.SelectedItem.ToString())
{
case "Rail-Fence":
plainText = RailFence.decrypt(s, tbKey.Text);
break;
case "DES":
if (tbKey.Text.Length == 8)
{
plainText = DES.decrypt(s, tbKey.Text);
}
else
{
MessageBox.Show("Please type a key of size 8");
}
break;
case "RSA":
plainText = RSA.decrypt(s);
break;
default:
break;
}
return(plainText);
}
private string encryptText(string s) //function to select correct cipher algorithm. Chance to add more ciphers in the future
{
if (lbCiphers.SelectedItem == null)
{
MessageBox.Show("Please select a cipher to use!", "Warning!");
return(null);
}
if (s.Length <= 0)
{
MessageBox.Show("Please type plain text to encrypt");
return(null);
}
switch (lbCiphers.SelectedItem.ToString())
{
case "Rail-Fence":
cipherText = RailFence.encrypt(s, tbKey.Text);
break;
case "DES":
if (tbKey.Text.Length == 8)
{
cipherText = DES.encrypt(s, tbKey.Text);
}
else
{
MessageBox.Show("Please type a key of size 8");
}
break;
case "RSA":
cipherText = RSA.encrypt(s);
break;
default:
break;
}
return(cipherText);
}