Implement Blowfish algorithm in Java for encrypt and decrypt file

Question

Hi all sorry if I make you confused in my prev question, I want know about how implement Blowfish algorithm in java for encrypted and decrypt file ?

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import javax.swing.JFormattedTextField;
import java.io.ObjectOutputStream;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.WindowConstants;
public class aa extends javax.swing.JFrame {
private JButton jButton1;
private JButton jButton2;
private JLabel jLabel2;
private JLabel jLabel3;
private JButton jButton3;
private JPasswordField jPasswordField1;
private JLabel jLabel1;
private JTextField jTextField1;
private JTextField jTextField3;

/**
* Auto-generated main method to display this JFrame
*/
public static void main(String[] args) {
aa inst = new aa();
inst.setVisible(true);
}

public aa() {
super();
initGUI();
}

private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
this.getContentPane().setLayout(null);
this.setTitle("Program Enkripsi Dekripsi");
{
jButton1 = new JButton();
this.getContentPane().add(jButton1);
jButton1.setText("Enkripsi");
jButton1.setBounds(70, 88, 58, 24);
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {

//TODO add your code for jButton10.actionPerformed
saveFile();

}
});
}
{
jTextField1 = new JTextField();
this.getContentPane().add(jTextField1);
jTextField1.setBounds(71, 17, 141, 19);
}
{
jLabel1 = new JLabel();
this.getContentPane().add(jLabel1);
jLabel1.setText("Input");
jLabel1.setBounds(8, 10, 60, 30);
}
{
jButton2 = new JButton();
this.getContentPane().add(jButton2);
jButton2.setText("Browse");
jButton2.setBounds(218, 17, 65, 19);
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt){
//TODO add your code for jButton1.actionPerformed
loadFile();
}
});
}
{
jLabel2 = new JLabel();
this.getContentPane().add(jLabel2);
jLabel2.setText("Password");
jLabel2.setBounds(7, 42, 60, 30);
}
{
jPasswordField1 = new JPasswordField();
this.getContentPane().add(jPasswordField1);
jPasswordField1.setBounds(71, 47, 141, 19);
}
{
jButton3 = new JButton();
this.getContentPane().add(jButton3);
jButton3.setText("Dekripsi");
jButton3.setBounds(150, 89, 62, 24);
jButton3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
saveFile2();
}
});
}
{
jLabel3 = new JLabel();
this.getContentPane().add(jLabel3);
jLabel3.setBounds(68, 112, 148, 30);
jLabel3.setFont(new java.awt.Font("Dialog",0,10));
jLabel3.setForeground(new java.awt.Color(0,0,255));
}

pack();
this.setSize(299, 170);
} catch (Exception e) {
e.printStackTrace();
}
}

private void loadFile ( ) {
JFileChooser chooser = new JFileChooser( );
int result = chooser.showOpenDialog(this);
if (result == JFileChooser.CANCEL_OPTION) return;
try {
jTextField1.setText(chooser.getSelectedFile().getAbsolutePath());
jTextField3.setText(chooser.getSelectedFile().getName());
}
catch (Exception e) {

}
}

private void saveFile( ) {
File plain = new File(jTextField1.getText());
Key key;
//copy = chooser.getSelectedFile();
File copy = new File(jTextField1.getText()+".dika");
try {
KeyGenerator generator = KeyGenerator.getInstance("Blowfish");
// initialization of keygenerator with PRNG

byte[] seed = jPasswordField1.getText().getBytes();
generator.init(new SecureRandom(seed));
// generating key
key = generator.generateKey();
// creating of file
File kunci =new File(jTextField1.getText()+".key");
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(kunci));
// writing key to a file
out.writeObject(key);
// closing of stream
out.close();

Cipher cipher = Cipher.getInstance("Blowfish/EBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
FileInputStream fis = new FileInputStream(plain);
FileOutputStream fos = new FileOutputStream(copy);
CipherOutputStream out2 = new CipherOutputStream(fos, cipher);
byte[] buffer = new byte[1024];
while (fis.read(buffer)>=0) {
out2.write(buffer);
}
kunci.delete();
plain.delete();
JOptionPane.showMessageDialog(this,"File Berhasil dienkripsi.");

}catch(Exception e) {

JOptionPane.showMessageDialog(this, e);
JOptionPane.showMessageDialog(this,"File Gagal dienkripsi.");


}finally {

}
}

private void saveFile2( ) {

//JFileChooser chooser = new JFileChooser( );
//chooser.showSaveDialog(this);
File plain = new File(jTextField1.getText());
Key key;
//copy = chooser.getSelectedFile();
File copy = new File(jTextField1.getText().replaceAll(".dika",""));

try {
KeyGenerator generator = KeyGenerator.getInstance("Blowfish");
// initialization of keygenerator with PRNG
byte[] dika = jPasswordField1.getText().getBytes();
generator.init(new SecureRandom(dika));
// generating key
key = generator.generateKey();
File kunci =new File(jTextField1.getText().replaceAll(".dika","")+".key");
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(kunci));
// writing key to a file
out.writeObject(key);
// closing of stream
out.close();

Cipher cipher = Cipher.getInstance("Blowfish/EBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
FileInputStream fis = new FileInputStream(plain);
FileOutputStream fos = new FileOutputStream(copy);
CipherOutputStream out2 = new CipherOutputStream(fos, cipher);
byte[] buffer = new byte[1024];
while (fis.read(buffer)>=0) {
out2.write(buffer);
}
fos.close();
fis.close();
kunci.delete();
plain.delete();
JOptionPane.showMessageDialog(this,"File berhasil di dekripsi.");
}catch(Exception e) {
JOptionPane.showMessageDialog(this, e);
JOptionPane.showMessageDialog(this,"File gagal di dekripsi.");
} finally {

}

}

}

It's that true Blowfish algorithm for Encrypt and Decrypt File ?

Answer 1

Alright I've modified the code so you won't need those files. You can edit it as you please. plaintextfile is the input file and ciphertextfile is the output file.

import java.util.*;
import java.lang.*;
import java.io.*;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import javax.crypto.spec.SecretKeySpec;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

class Ideone
{
    public static void main(String[] args) throws Exception {
    blowfishEncrypt("plaintextfile", "ciphertextfile");
  }

  public static void blowfishEncrypt(String f1, String f2) throws Exception {
    String keytext = "mykey";
    SecretKey secret_key = new SecretKeySpec(keytext.getBytes(), "Blowfish");
    Cipher cipher = Cipher.getInstance("Blowfish/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, secret_key);

    BufferedInputStream in = new BufferedInputStream(new FileInputStream(f1));
    CipherOutputStream out = new CipherOutputStream(new BufferedOutputStream(new FileOutputStream(
        f2)), cipher);
    int i;
    do {
      i = in.read();
      if (i != -1)
        out.write(i);
    } while (i != -1);
    in.close();
    out.close();
  }
}