XORFileEncrypt-Decrypt.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package xor_crypt;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;

public class XORFileEncryptorGUI extends JFrame {
    private JTextField keyField;
    private JButton encryptButton, decryptButton;
    private JFileChooser fileChooser;
    
    public XORFileEncryptorGUI() {
        setTitle("XOR File Encryptor");
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());
        
        keyField = new JTextField(20);
        encryptButton = new JButton("Encrypt File");
        decryptButton = new JButton("Decrypt File");
        fileChooser = new JFileChooser();
        
        add(new JLabel("Key:"));
        add(keyField);
        add(encryptButton);
        add(decryptButton);
        
        encryptButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                processFile(true);
            }
        });
        
        decryptButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                processFile(false);
            }
        });
    }
    
    private void processFile(boolean encrypt) {
        if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            String key = keyField.getText();
            if (key.isEmpty()) {
                JOptionPane.showMessageDialog(this, "Please enter a key", "Error", JOptionPane.ERROR_MESSAGE);
                return;
            }
            try {
                byte[] fileData = readFile(file);
                byte[] keyBytes = key.getBytes();
                byte[] processedData = xorEncryptDecrypt(fileData, keyBytes);
                writeFile(new File(file.getAbsolutePath() + (encrypt ? ".enc" : ".dec")), processedData);
                JOptionPane.showMessageDialog(this, "File processed successfully!", "Success", JOptionPane.INFORMATION_MESSAGE);
            } catch (IOException ex) {
                JOptionPane.showMessageDialog(this, "Error processing file: " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
            }
        }
    }
    
    private byte[] xorEncryptDecrypt(byte[] data, byte[] key) {
        byte[] result = new byte[data.length];
        for (int i = 0; i < data.length; i++) {
            result[i] = (byte) (data[i] ^ key[i % key.length]);
        }
        return result;
    }
    
    private byte[] readFile(File file) throws IOException {
        try (FileInputStream fis = new FileInputStream(file)) {
            byte[] data = new byte[(int) file.length()];
            fis.read(data);
            return data;
        }
    }
    
    private void writeFile(File file, byte[] data) throws IOException {
        try (FileOutputStream fos = new FileOutputStream(file)) {
            fos.write(data);
        }
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            XORFileEncryptorGUI frame = new XORFileEncryptorGUI();
            frame.setVisible(true);
        });
    }
}