FileCryptographer.java

package Cryptography;

import javax.swing.*;
import java.awt.*;
import java.io.*;

public class Cryptography {

    public static void operation(int key) {
        // Create a file chooser dialog to select a file
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.showOpenDialog(null);
        File file = fileChooser.getSelectedFile();

        // File input stream for reading input
        try {
            FileInputStream fis = new FileInputStream(file);

            byte[] data = new byte[fis.available()];
            fis.read(data);

            // Print the byte values of the data array
            for (byte b : data) {
                System.out.print(b + " ");
            }
            
            int i = 0;
            for (byte b : data) {
                // XOR operation on each byte of data with the given key
                data[i] = (byte) (b ^ key);
                i++;
            }

            // File output stream for writing modified data back to the file
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(data);
            fos.close();
            fis.close();
            
            // Display a message dialog to indicate successful operation
            JOptionPane.showMessageDialog(null, "Done");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception ignored) {}

        // GUI setup
        System.out.println("Hello, This is the Image Cryptography model made by Sunder Singh");
        JFrame f = new JFrame();

        JLabel label = new JLabel();
        label.setText("THE IMAGE CODER / DECODER");
        label.setFont(new Font("PLAIN", Font.BOLD, 25));
        label.setBackground(Color.GREEN);
        label.setOpaque(true);

        JLabel labelB = new JLabel();
        ImageIcon img = new ImageIcon("D:\\Codes\\eclipse workspace\\mini_project_4th_sem\\src\\newicon.gif");
        labelB.setIcon(img);


        f.setTitle("Image Cryptography System - By Sunder Singh");
        f.setSize(500, 500);
        f.setLocationRelativeTo(null);
        f.setResizable(false);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Font font = new Font("ROBOTO", Font.BOLD, 25);

        JButton button = new JButton();
        button.setText("Encrypt");
        button.setFont(new Font("PLAIN", Font.PLAIN, 20));

        JButton button1 = new JButton();
        button1.setText("Decrypt");
        button1.setFont(new Font("PLAIN", Font.PLAIN, 20));

        JTextField textfield = new JTextField(10);
        textfield.setFont(font);
        textfield.setPreferredSize(new Dimension(250, 40));
        textfield.setFont(new Font("PLAIN", Font.PLAIN, 35));
        textfield.setBackground(Color.white);
        textfield.setCaretColor(Color.black);

        // ActionListener for the "Encrypt" button
        button.addActionListener(e -> {
            System.out.println("Button clicked");
            String text = textfield.getText();
            if (!text.isEmpty()) {
                try {
                    int temp = Integer.parseInt(text);
                    operation(temp); // Call the operation method with the entered key
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(null, "Invalid key format. Please enter a valid integer key.");
                }
            } else {
                JOptionPane.showMessageDialog(null, "Please enter a key.");
            }
            textfield.setText(null);
        });

        // ActionListener for the "Decrypt" button (same as Encrypt button)
        button1.addActionListener(e -> {
            System.out.println("Button clicked");
            String text = textfield.getText();
            if (!text.isEmpty()) {
                try {
                    int temp = Integer.parseInt(text);
                    operation(temp); // Call the operation method with the entered key
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(null, "Invalid key format. Please enter a valid integer key.");
                }
            } else {
                JOptionPane.showMessageDialog(null, "Please enter a key.");
            }
            textfield.setText(null);
        });
       


        // Add components to the JFrame
        f.setLayout(new FlowLayout());
        f.add(label);
        f.add(button);
        f.add(button1);
        f.add(textfield);
        f.add(labelB);
        f.setVisible(true);
        
    }
}