encryption.java~142~

用JAVA编写的用密码学中DES算法加密解密文件的程序

package cry;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
/**
 * <p>Title: CRY-DES</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: Fontys</p>
 * @author Ying & Bill
 * @version 1.0
 */

public class Encryption extends JFrame implements ActionListener{
  JPanel jPanel1 = new JPanel();//panel
  JMenuBar jMenuBar1 = new JMenuBar();//menubar
  JMenu jMenu1 = new JMenu();//menubar
  JMenuItem jMenuItem1 = new JMenuItem();
  JMenuItem jMenuItem2 = new JMenuItem();
  JMenuItem jMenuItem3 = new JMenuItem();
  JLabel jLabel1 = new JLabel();//label
  JMenu jMenu2 = new JMenu();//menu
  JTabbedPane jTabbedPane1 = new JTabbedPane();
  JPanel pEncry = new JPanel();//encryption panel
  JLabel lKey = new JLabel();//key label
  JTextField tKey = new JTextField();
  JLabel jLabel2 = new JLabel();
  JButton bEncry = new JButton();
  JLabel Input = new JLabel();
  JLabel Output = new JLabel();
  JPanel pDecry = new JPanel();
  JLabel jLabel3 = new JLabel();
  JLabel jLabel4 = new JLabel();

  JButton bDecry = new JButton();
  JButton bLoad = new JButton();
  JScrollPane jScrollPane1 = new JScrollPane();
  JTextArea tEncryinput = new JTextArea();
  JScrollPane jScrollPane2 = new JScrollPane();
  JTextArea tEncryoutput = new JTextArea();
  JScrollPane jScrollPane3 = new JScrollPane();
  JScrollPane jScrollPane4 = new JScrollPane();
  JTextArea tDecryinput = new JTextArea();
  JTextArea tDecryoutput = new JTextArea();
  private JFileChooser jfc = new JFileChooser();
  String text="";
 //byte[] s;

  public Encryption() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  public static void main(String[] args) {
    Encryption encryption1 = new Encryption();
    encryption1.setSize(600,700);
    encryption1.show();

  }
  private void jbInit() throws Exception {
    //setJMenuBar(jMenuBar1);
    setTitle("CRY - DES  Author: Ying & Bill");
    jScrollPane1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane1.setAutoscrolls(true);
    jScrollPane1.setBounds(new Rectangle(39, 115, 441, 169));
    tEncryinput.setText("Here is the input of encryption");
    tEncryinput.setLineWrap(true);
    jScrollPane2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    jScrollPane2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane2.setAutoscrolls(true);
    jScrollPane2.setBounds(new Rectangle(42, 325, 444, 170));
    tEncryoutput.setText("Here is the output of encryption");
    tEncryoutput.setLineWrap(true);
    tEncryoutput.setBackground(Color.BLACK);
    tEncryoutput.setForeground(Color.GREEN);
    jScrollPane3.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    jScrollPane3.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane3.setAutoscrolls(true);
    jScrollPane3.setBounds(new Rectangle(16, 82, 492, 192));
    jScrollPane4.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    jScrollPane4.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    jScrollPane4.setAutoscrolls(true);
    jScrollPane4.setBounds(new Rectangle(15, 322, 496, 170));
    tDecryinput.setText("Here is the input of decryption");
    tDecryinput.setLineWrap(true);
    tDecryinput.setBackground(Color.ORANGE);
    tDecryinput.setForeground(Color.WHITE);
    tDecryoutput.setText("Here is the output of encryption");
    tDecryoutput.setLineWrap(true);
    jMenuBar1.add(jMenu1);
    jMenuBar1.add(jMenu2);
    jPanel1.setLayout(null);
    jMenu1.setText("File");
    jMenuItem1.setText("Open");
    jMenuItem2.setText("Save");
    jLabel1.setText("CRY - DES");
    jLabel1.setBounds(new Rectangle(246, 10, 180, 32));
    jMenu2.setText("About Us");
    jMenuItem3.setText("Help");
    jTabbedPane1.setBounds(new Rectangle(4, 75, 556, 533));
    pEncry.setLayout(null);
    pEncry.setName("encryption");
    lKey.setText("Key");
    lKey.setBounds(new Rectangle(15, 45, 47, 29));
    tKey.setBounds(new Rectangle(50, 50, 189, 24));
    jLabel2.setText("(Please enter a key with  16 bits)");
    jLabel2.setBounds(new Rectangle(250, 50, 189, 22));
    bEncry.setBounds(new Rectangle(373, 19, 120, 29));
    bEncry.setText("Encryption");
    Input.setText("Encryption input");
    Input.setBounds(new Rectangle(38, 80, 113, 25));
    Output.setText("Output text");
    Output.setBounds(new Rectangle(38, 297, 92, 27));
    pDecry.setLayout(null);
    jLabel3.setText("Decryption text");
    jLabel3.setBounds(new Rectangle(16, 56, 91, 27));
    jLabel4.setText("Decryption output");
    jLabel4.setBounds(new Rectangle(15, 293, 104, 26));
    bDecry.setBounds(new Rectangle(361, 6, 154, 35));
    bDecry.setText("Decryption");
    bLoad.setBounds(new Rectangle(183, 7, 138, 34));
    bLoad.setText("Load");
    jMenuBar1.add(jMenu1);
    jMenuBar1.add(jMenu2);
    jMenu1.add(jMenuItem1);
    jMenu1.add(jMenuItem2);
    jMenu2.add(jMenuItem3);
    jPanel1.add(jLabel1, null);
    jPanel1.add(jTabbedPane1, null);

    jPanel1.add(lKey,null);
    jPanel1.add(tKey,null);
    jPanel1.add(jLabel2,null);

    //pEncry.add(tKey, null);
    //pEncry.add(lKey, null);
    pEncry.add(bEncry, null);
    //pEncry.add(jLabel2, null);
    pEncry.add(Output, null);
    pEncry.add(Input, null);
    pEncry.add(jScrollPane1, null);
    pEncry.add(jScrollPane2, null);
    jScrollPane2.getViewport().add(tEncryoutput, null);
    jScrollPane1.getViewport().add(tEncryinput, null);
    pDecry.add(bDecry, null);
    pDecry.add(bLoad, null);
    pDecry.add(jScrollPane3, null);
    jScrollPane3.getViewport().add(tDecryinput, null);
    pDecry.add(jLabel3, null);
    pDecry.add(jLabel4, null);
    pDecry.add(jScrollPane4, null);
    jScrollPane4.getViewport().add(tDecryoutput, null);
    jTabbedPane1.add(pEncry,   "Encryption");
    jTabbedPane1.add(pDecry, "Decryption");

    getContentPane().add(jPanel1);

    jMenuItem1.addActionListener(this);
    jMenuItem2.addActionListener(this);
    jMenuItem3.addActionListener(this);
    bEncry.addActionListener(this);
    bDecry.addActionListener(this);
    bLoad.addActionListener(this);
  }

  public void actionPerformed(ActionEvent e)
  {
   if(e.getSource()==bEncry)
   {
      String key=tKey.getText();
      System.out.println("the length of key is "+key.length());
      if(!checkBi(key))
      {
        JOptionPane.showMessageDialog(null, "please enter binary bits 0 or 1 as key!\n example: 10000101010101010");
      }
      else if((key.length()!=16))
        JOptionPane.showMessageDialog(null, "please enter 16 bits as key!\n example: 10000101010101010");
      else
      {
        //key=getKey(key);
        String encryText="";
        encryText=encry(tEncryinput.getText(),key);
        tEncryoutput.setText("");
        tEncryoutput.append(encryText);
      }

   }
   if(e.getSource()==bDecry)
   {
      String key = tKey.getText();
      System.out.println("key length is "+key.length());
      if (key.length() != 16)
          JOptionPane.showMessageDialog(null, "please enter 16 bits binary as key!\n example: 10000101010101010");
      else
      {
          //key = getKey(key);
          String decryText = "";
          decryText = decry(tDecryinput.getText(), key);
          tDecryoutput.setText("");
          tDecryoutput.append(decryText);
      }
   }
   if(e.getSource()==bLoad)
   {
      tDecryinput.setText("");
      tDecryinput.append(tEncryoutput.getText());
   }
  }

   public boolean checkBi(String key)
  {

    char m=' ';;
    for(int i=0;i<key.length();i++)
    {
      m=key.charAt(i);
      if((m!='0')&&(m!='1'))
      {
        System.out.print("m is "+m+" which is not binary"+i);
        return false;
      }
    }
    System.out.println("no problem for key");
    return true;
  }

  public String getKey(String character)
  {
    String key="";
    String sub1="";
    String sub2="";
    int c1=character.charAt(0);
    int c2=character.charAt(1);
    System.out.println("&&&&&&&&&&&&&&&&&c1 is "+c1);
    System.out.println("&&&&&&&&&&&&&&&&&c2 is "+c2);
    sub1=convertDToB(c1,8);
    System.out.println("sub1 is "+sub1);
    sub2=convertDToB(c2,8);
    key=sub1+sub2;
    System.out.println("&&&&&&&&&&&&&&&&&&&&&&&key is "+key);
    return key;
  }
  public String encry(String text, String key)
  {
    String subText="";
    String subKey1="";
    String subKey2="";
    String result="";

    subKey1=calSubKey(key)[0];
    subKey2=calSubKey(key)[1];
    System.out.println("in encry subkey1 is "+subKey1);
    System.out.println("in encry subkey2 is "+subKey2);

    //for the odd numbers of length in text
    if((text.length()%2)==1)
      text+=" ";
    for(int i=0; i<text.length();i++)
    {
      subText=text.substring(i,i+2);
      result+=subcry(subText,subKey1,subKey2);
      //i will be add i again in the for loop
      i++;
    }
    return result;
  }

  public String decry(String text, String key)
  {
    String subText="";
    String subKey1="";
    String subKey2="";
    String result="";

    subKey1=calSubKey(key)[1];
    subKey2=calSubKey(key)[0];

     //for the odd numbers of length in text
    if((text.length()%2)==1)
      text+=" ";
    for(int i=0; i<text.length();i++)
    {
      subText=text.substring(i,i+2);
      result+=subcry(subText,subKey1,subKey2);
      i++;
    }
    return result;
  }


  public String subcry(String subText, String subkey1,String subkey2)
  {
    String subEncry="";
    String textInBi=textToBi(subText);
    String passIP="";
    String g1="";
    String g2="";
    String passF="";
    String passCombine1="";
    String passCombine2="";
    String beforeIP_1="";
    String passIP_1="";

    System.out.println("**************************subkey1 is "+subkey1);
    System.out.println("**************************subkey2 is "+subkey2);
    int[] IP={10,6,14,2,
               8,16,12,4,
               1,13,7,9,
               5,11,3,15};
    int[] IP_1={9,4,15,8,
              13,2,11,5,
              12,1,14,7,