mainframe.java

用差分方法攻击加密文件

package encrypt;

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

public class MainFrame extends JFrame {

  JFileChooser fd_load,fd_load2;

  final int buffer=10000;

  int key;
  byte s0[][]={
  {1,0,3,2},
  {3,2,1,0},
  {0,2,1,3},
  {3,1,3,2}
  };
  byte s1[][]={
  {0,1,2,3},
  {2,0,1,3},
  {3,0,1,0},
  {2,1,0,3}
  };

  private JPanel contentPane;
  private JLabel jLabel1 = new JLabel();
  private JLabel jLabel2 = new JLabel();
  private JLabel jLabel3 = new JLabel();
  private JButton startBtn = new JButton();
  private JTextField sourceTextField = new JTextField();
  private JTextField destiTextField = new JTextField();
  private JButton srcBtn = new JButton();
  private JButton desBtn = new JButton();
  private JLabel jLabel4 = new JLabel();
  private JLabel jLabel5 = new JLabel();
  private JLabel jLabel6 = new JLabel();
  private JTextField keyTextField = new JTextField();
  public MainFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    jLabel1.setText("Source file :");
    jLabel1.setBounds(new Rectangle(47, 89, 71, 31));
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 350));
    this.setTitle("Single encrypt");

    fd_load=new JFileChooser();
    fd_load.setFileFilter(new Filter(".txt"));
    fd_load.setVisible(false);

    fd_load2=new JFileChooser();
    fd_load2.setFileFilter(new Filter(".txt"));
    fd_load2.setVisible(false);
    jLabel2.setText("This program is so simple that it is just for the difference-attack " +
    "test.");
    jLabel2.setBounds(new Rectangle(8, 20, 390, 18));
    jLabel3.setBounds(new Rectangle(26, 156, 96, 31));
    jLabel3.setText("Destination file :");
    startBtn.setBounds(new Rectangle(25, 226, 92, 71));
    startBtn.setText("Start !");
    startBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        startBtn_actionPerformed(e);
      }
    });
    sourceTextField.setBounds(new Rectangle(123, 94, 236, 22));
    destiTextField.setBounds(new Rectangle(122, 159, 236, 22));
    srcBtn.setBounds(new Rectangle(126, 122, 89, 29));
    srcBtn.setText("Browse...");
    srcBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        srcBtn_actionPerformed(e);
      }
    });
    desBtn.setText("Browse...");
    desBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        desBtn_actionPerformed(e);
      }
    });
    desBtn.setBounds(new Rectangle(125, 190, 89, 29));
    jLabel4.setText("Welcome to have a tryout on another");
    jLabel4.setBounds(new Rectangle(134, 245, 207, 19));
    jLabel5.setText("program named \"difference_attack\". ");
    jLabel5.setBounds(new Rectangle(133, 272, 200, 18));
    jLabel6.setText("work key :");
    jLabel6.setBounds(new Rectangle(58, 62, 62, 18));
    keyTextField.setText("222");
    keyTextField.setBounds(new Rectangle(122, 59, 236, 22));
    contentPane.add(jLabel2, null);
    contentPane.add(jLabel6, null);
    contentPane.add(keyTextField, null);
    contentPane.add(sourceTextField, null);
    contentPane.add(srcBtn, null);
    contentPane.add(jLabel1, null);
    contentPane.add(jLabel3, null);
    contentPane.add(destiTextField, null);
    contentPane.add(desBtn, null);
    contentPane.add(startBtn, null);
    contentPane.add(jLabel4, null);
    contentPane.add(jLabel5, null);
  }
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void srcBtn_actionPerformed(ActionEvent e) {
    fd_load.setVisible(true);
      int result=fd_load.showOpenDialog(this);
      if(result==fd_load.APPROVE_OPTION){
        this.sourceTextField.setText(fd_load.getSelectedFile().getPath());
        String parent=fd_load.getSelectedFile().getParent();
        String name=fd_load.getSelectedFile().getName();

          this.destiTextField.setText(parent+"\\en_"+name);

      }
      else fd_load.setVisible(false);
  }

  void desBtn_actionPerformed(ActionEvent e) {
    fd_load2.setVisible(true);
    int result=fd_load2.showOpenDialog(this);
    if(result==fd_load2.APPROVE_OPTION){
      this.sourceTextField.setText(fd_load2.getSelectedFile().getPath());
    }
    else fd_load.setVisible(false);
  }

  void startBtn_actionPerformed(ActionEvent e) {
    int b;
    byte by[]=new byte[buffer];
    try{
      key=Integer.parseInt(this.keyTextField.getText());
    }
    catch (NumberFormatException ex){
    }

    try{

      FileInputStream readFile=new FileInputStream(this.sourceTextField.getText());
      FileOutputStream writeFile=new FileOutputStream(this.destiTextField.getText());
      b=readFile.read(by,0,buffer);

        while(b>0){
          for(int i=0;i<b;i++){
            by[i]=encrypt(by[i]);
          }

          writeFile.write(by,0,b);
          b=readFile.read(by,0,buffer);
        }



      JOptionPane.showMessageDialog(this,"Done!","finish",JOptionPane.INFORMATION_MESSAGE);
      readFile.close();writeFile.close();
    }catch(IOException ex){
      JOptionPane.showMessageDialog(this,"File Error!check the path..","Error",JOptionPane.ERROR_MESSAGE);
    }
  }

  byte encrypt(byte b){
    int by;
    //key=91;System.out.print(b+"--->");
    by=b^key;//System.out.print(by+":");
    by=sBox(by);//System.out.print(by+" ");


    //key=107;
    //by=b^key; System.out.print(by+":");
    //by=sBox(by);System.out.println(by);


    return (byte)by;
  }

  int sBox(int a){
    int result=0;
    int x2=a>>>4;int x1=a>>>6;int x=x1&2|(x2&1);
    int y=(a>>>5)&3;
    result|=(s0[x][y]<<2);

    x1=a>>>2;x=x1&2|a&1;
    y=(a>>>1)&3;
    result|=s1[x][y];
    return result;
  }

}