Practical No-7

Aim: Write a program to implement Blowfish algorithm

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.swing.JOptionPane;

public class blowfish

{

            public static void main(String[] args) throws Exception

 {

KeyGenerator keygen = KeyGenerator.getInstance("Blowfish");

SecretKey secretkey = keygen.generateKey();

Cipher cip = Cipher.getInstance("Blowfish");

cip.init(Cipher.ENCRYPT_MODE, secretkey);

String inputText = JOptionPane.showInputDialog(" Give Input: ");

byte[] encrypted = cip.doFinal(inputText.getBytes());

cip.init(Cipher.DECRYPT_MODE, secretkey);

byte[] decrypted = cip.doFinal(encrypted);

JOptionPane.showMessageDialog(JOptionPane.getRootFrame(),"encrypted : " +     new String(encrypted) + "\n" +"decrypted : " + new String(decrypted));

System.exit(0);

}

}