mainframe.java

简单的基于DES的加密算法及雪崩效应分析。请仔细阅读内附的说明文件。

package sdespassword;

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

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

public class MainFrame extends JFrame {
//********************************************************
  JFileChooser fd_load,fd_save;

  final int buffer=10000;

  byte key[]={0,0};
  int p10[]={3,5,2,7,4,10,1,9,8,6};
  int p8[] = {6,3,7,4,8,5,10,9 };
  int IP[] = { 2,6,3,1,4,8,5,7 };
  int IP_con[]={4,1,3,5,7,2,8,6 };
  int EPright[]={8,5,6,7,6,7,8,5};
  int p4right[] = {0,0,0,0,6,8,7,5};
  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 JComboBox EDComboBox = new JComboBox();
  private JLabel jLabel2 = new JLabel();
  private JLabel jLabel3 = new JLabel();
  private JTextField keyTextField = new JTextField();
  private JTextField sourceTextField = new JTextField();
  private JTextField destiTextField = new JTextField();
  private JLabel jLabel4 = new JLabel();
  private JButton startBtn = new JButton();
  private JButton sourceBtn = new JButton();
  private JButton destiBtn = new JButton();

  public MainFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    jLabel1.setToolTipText("");
    jLabel1.setText("Encrypt/decrypt : ");
    jLabel1.setBounds(new Rectangle(22, 18, 96, 19));
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 314));
    this.setTitle("SDES");
    EDComboBox.setToolTipText("");
    EDComboBox.setBounds(new Rectangle(121, 16, 141, 22));
    jLabel2.setText("Source file :");
    jLabel2.setBounds(new Rectangle(22, 96, 96, 18));
    jLabel3.setText("Key :");
    jLabel3.setBounds(new Rectangle(22, 57, 96, 18));
    keyTextField.setText("291");
    keyTextField.setBounds(new Rectangle(121, 55, 141, 22));

    sourceTextField.setBounds(new Rectangle(121, 94, 259, 22));
    destiTextField.setToolTipText("");
    destiTextField.setBounds(new Rectangle(121, 150, 261, 22));
    jLabel4.setBounds(new Rectangle(22, 152, 96, 18));
    jLabel4.setText("Destination file :");
    startBtn.setBounds(new Rectangle(21, 209, 82, 59));
    startBtn.setText("Start !");
    startBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        startBtn_actionPerformed(e);
      }
    });
    sourceBtn.setBounds(new Rectangle(121, 122, 103, 22));
    sourceBtn.setText("Browse...");
    sourceBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        sourceBtn_actionPerformed(e);
      }
    });
    destiBtn.setText("Browse...");
    destiBtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        destiBtn_actionPerformed(e);
      }
    });
    destiBtn.setBounds(new Rectangle(121, 181, 104, 22));
    contentPane.add(jLabel1, null);
    contentPane.add(EDComboBox, null);
    contentPane.add(jLabel3, null);
    contentPane.add(keyTextField, null);
    contentPane.add(jLabel2, null);
    contentPane.add(sourceTextField, null);
    contentPane.add(sourceBtn, null);
    contentPane.add(destiTextField, null);
    contentPane.add(jLabel4, null);
    contentPane.add(destiBtn, null);
    contentPane.add(startBtn, null);
//*************************************************************
    //*********************************************************
    this.EDComboBox.addItem("Encrypt");
    this.EDComboBox.addItem("Decrypt");
    this.EDComboBox.setSelectedIndex(0);

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

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


    //*********************************************************
//*************************************************************
  }
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void sourceBtn_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();
        if(this.EDComboBox.getSelectedIndex()==0)
          this.destiTextField.setText(parent+"\\en_"+name);
        else
          this.destiTextField.setText(parent+"\\de_"+name);
      }
      else fd_load.setVisible(false);
  }

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

  void startBtn_actionPerformed(ActionEvent e) {
    int b;
    byte by[]=new byte[buffer];


    generateKey(this.keyTextField.getText(),key);

    try{

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

      if(this.EDComboBox.getSelectedIndex()==0){
        byte pre=34;
        //pre=encrypt(pre);
        while(b>0){
          for(int i=0;i<b;i++){
            by[i]=encrypt((byte)(by[i]^pre));
            pre=by[i];
          }

          writeFile.write(by,0,b);
          b=readFile.read(by,0,buffer);
        }
      }
      else{
        byte pre=34;byte temp;
        while(b>0){
          for(int i=0;i<b;i++){
            temp=by[i];
            by[i]=(byte)(decrypt(by[i])^pre);
            pre=temp;
          }

          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);

    }

  }
 //***********************************************************
  void generateKey(String str,byte []k){
    int key=0;
    try{
      key=Integer.parseInt(str);
      key=exchange_10(p10,key);

      int keyHigh=key&0x3e0;
      int keyLow=key&0x1f;
      key=moveOne_5(keyHigh,keyLow);
      k[0]=(byte)(exchange_10to8(p8,key));

      keyHigh=key&0x3e0;
      keyLow=key&0x1f;
      key=moveOne_5(keyHigh,keyLow);
      keyHigh=key&0x3e0;
      keyLow=key&0x1f;
      key=moveOne_5(keyHigh,keyLow);

      k[1]=(byte)(exchange_10to8(p8,key));
    //System.out.println(k[1]);
      }catch (NumberFormatException ex) {}


  }

//************************************************************
  int moveOne_5(int keyHigh,int keyLow){

      keyHigh<<=1;
      if((keyHigh&0x400) !=0)
        keyHigh|=0x20;
      keyLow<<=1;
      if((keyLow&0x20) !=0)
        keyLow|=1;
      return (keyHigh&0x3e0)|(keyLow&0x1f);
  }
  int exp[]={0,0x80,0x40,0x20,0x10,8,4,2,1};
  int exp_10[]={0,0x200,0x100,0x80,0x40,0x20,0x10,8,4,2,1};


  byte exchange(int []p,byte a){
    int b=0;
    int temp;
    for(int i=0;i<p.length;i++){
      temp=a&exp[p[i]];
      if(temp!=0){
        b=b|exp[i+1];
      }

    }
    return (byte)b;
  }

  int exchange_10(int []p,int a){
    int b=0;
    int temp;
    for(int i=0;i<p.length;i++){
      temp=a&exp_10[p[i]];
      if(temp!=0){
        b=b|exp_10[i+1];
      }

    }
    return b;
  }

  byte exchange_10to8(int []p,int a){
    int b=0;
    int temp;
    for(int i=0;i<p.length;i++){
      temp=a&exp_10[p[i]];
      if(temp!=0){
        b=b|exp[i+1];
      }

    }
    return (byte)b;
  }

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

    x1=a>>>2;x=x1&2|a&1;
    //temp=a;
    y=(a>>>1)&3;
    result|=s1[x][y];
    return (byte)result;
  }
//****************************************************************
  byte encrypt(byte by){
   //for(int k=1; k<127;k*=2){
    //by=(byte)k;
    //by=0;
    by=exchange(IP,by);
    int high=by&0xf0;int low=by&0x0f;
    by=exchange(EPright,by);
    by=(byte)(by^key[0]);

    by=sBox(by);
    by=exchange(p4right,by);
    by=(byte)(by^(high>>>4));
    by=(byte)((low<<4)|by);

    high=by&0xf0; low=by&0x0f;
    by=exchange(EPright,by);
    by=(byte)(by^key[1]);

    by=sBox(by);
    by=exchange(p4right,by);
     by=(byte)((by<<4)^high);
     by=(byte)(by|low);
     by=exchange(IP_con,by);
     //System.out.println(by&0xff);
    return by;
  }

  byte decrypt(byte by){
    by=exchange(IP,by);
    int high=by&0xf0;int low=by&0x0f;
    by=exchange(EPright,by);
    by=(byte)(by^key[1]);

    by=sBox(by);
    by=exchange(p4right,by);
    by=(byte)(by^(high>>>4));
    by=(byte)((low<<4)|by);

    high=by&0xf0; low=by&0x0f;
    by=exchange(EPright,by);
    by=(byte)(by^key[0]);

    by=sBox(by);
    by=exchange(p4right,by);
     by=(byte)((by<<4)^high);
     by=(byte)(by|low);
     by=exchange(IP_con,by);
    return by;
  }




}