mainframe.java~1~

用差分方法攻击加密文件

package difference_attack;

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;
  final int count=250;

  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();
  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(36, 42, 71, 31));
    contentPane.setLayout(null);
    this.setSize(new Dimension(500, 350));
    this.setTitle("Difference attack");

    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 based on a pair of files processed by the program " +
    " \"simple encrypt\".");
    jLabel2.setBounds(new Rectangle(8, 20, 467, 18));
    jLabel3.setBounds(new Rectangle(21, 109, 89, 31));
    jLabel3.setText("encrypted file :");
    startBtn.setBounds(new Rectangle(21, 191, 92, 71));
    startBtn.setText("Start !");
    startBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        startBtn_actionPerformed(e);
      }
    });
    sourceTextField.setBounds(new Rectangle(112, 47, 355, 22));
    destiTextField.setBounds(new Rectangle(111, 112, 356, 22));
    srcBtn.setBounds(new Rectangle(115, 75, 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(114, 143, 89, 29));
    jLabel4.setText("The work key is: ");
    jLabel4.setBounds(new Rectangle(135, 214, 98, 19));
    jLabel5.setFont(new java.awt.Font("Dialog", 1, 16));
    jLabel5.setForeground(Color.red);
    jLabel5.setText("null");
    jLabel5.setBounds(new Rectangle(239, 210, 82, 27));
    contentPane.add(jLabel2, null);
    contentPane.add(jLabel1, null);
    contentPane.add(sourceTextField, null);
    contentPane.add(srcBtn, null);
    contentPane.add(destiTextField, null);
    contentPane.add(desBtn, null);
    contentPane.add(jLabel3, 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 srcLength,enLength;
    byte src[]=new byte[buffer];
    byte en[]=new byte[buffer];

    try{
      FileInputStream srcFile=new FileInputStream(this.sourceTextField.getText());
      FileInputStream enFile=new FileInputStream(this.destiTextField.getText());
      srcLength=srcFile.read(src,0,buffer);
      enLength=enFile.read(en,0,buffer);
      if(srcLength!=enLength){
        JOptionPane.showMessageDialog(this,"File Error!unmatched pair","Error",JOptionPane.ERROR_MESSAGE);
        return;
      }

      int Eh,El;
      int EEh,EEl;//E*
      int EPh,EPl;//E'
      int b,bh,bl;
      int keyArrayHigh[]=new int[16];
      int keyArrayLow[]=new int[16];
      for(int i=0;i<count;i++){//begin analysis
        int random=(int)(Math.random()*buffer)%srcLength;
        Eh=(src[random]>>>4)&15;
        El=src[random]&15;
        int random2;
        do{
            random2=(int)(Math.random()*buffer)%srcLength;
        }while(random2==random);
        EEh=(src[random2]>>>4)&15;
        EEl=src[random2]&15;
        EPh=Eh^EEh;
        EPl=El^EEl;
        b=en[random]^en[random2];
        bh=(b>>>2)&3;
        bl=b&3;

        for(int j=0;j<16;j++){
         int jj=j^EPh;
         int sj=s0Box(j);
         int sjj=s0Box(jj);
         if((sj^sjj)==bh)
           keyArrayHigh[j^Eh]++;
        }

        for(int j=0;j<16;j++){
          int jj=j^EPl;
          if((s1Box(j)^s1Box(jj))==bl)
            keyArrayLow[j^El]++;
        }

      }

      for(int i=0;i<16;i++){
        if(keyArrayHigh[i]==count)
          System.out.println(i);
      }
      for(int i=0;i<16;i++){
        if(keyArrayLow[i]==count)
          System.out.println(i);
      }

      srcFile.close();enFile.close();
    }catch(IOException ex){
      JOptionPane.showMessageDialog(this,"File Error!check the path..","Error",JOptionPane.ERROR_MESSAGE);
    }
  }

  int s0Box(int a){
    int result=0;
    int x1=a>>>2;int x=x1&2|a&1;
    int y=(a>>>1)&3;
    result|=s0[x][y];
    return result;
  }

  int s1Box(int a){
    int result=0;
    int x1=a>>>2;int x=x1&2|a&1;
    int y=(a>>>1)&3;
    result|=s1[x][y];
    return result;
  }

  /*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;
  }*/

}