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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.security.*;
import javax.crypto.*;
/*
 * FileEncrypterT.java
 *
 * Created on 2006年6月29日, 上午11:14
 */
package key;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
/**
 *
 * @author  dragon love
 */
public class FileEncrypterT extends javax.swing.JFrame {
    public static final int WIDTH = 550;
    public static final int HEIGHT = 200;
   
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">                         
    private void initComponents() {
       
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(0, 400, Short.MAX_VALUE)
                );
        layout.setVerticalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(0, 300, Short.MAX_VALUE)
                );
        pack();
    }
    // </editor-fold>                       
   
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        FileEncrypter fe = new FileEncrypter();
        fe.show();
    }
    FileEncrypterT(){
        this.setSize(WIDTH,HEIGHT);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setResizable(false);
        Toolkit tk = Toolkit.getDefaultToolkit();
        Dimension screenSize = tk.getScreenSize();
        this.setLocation((screenSize.width - WIDTH)/2,
                (screenSize.height - HEIGHT)/2);
        this.setTitle("文件加密器(TriDES)");
        Container c = this.getContentPane();
        c.setLayout( new FlowLayout());
       
        final FilePanel fp = new FilePanel("文件选择");
        c.add(fp);
       
        final KeyPanel pp = new KeyPanel("密码");
        c.add(pp);
       
        JButton jbE = new JButton("加密");
        c.add(jbE);
        jbE.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                File file = new File(fp.getFileName());
                if (file.exists())
                    encrypt(file.getAbsoluteFile(),pp.getKey());
                else
                    JOptionPane.showMessageDialog(
                            null,"请选择文件!","提示",JOptionPane.OK_OPTION);
            }
        });
        JButton jbD = new JButton("解密");
        c.add(jbD);
        jbD.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){
                File file = new File(fp.getFileName());
                if (file.exists())
                    decrypt(file.getAbsoluteFile(),pp.getKey());
                else
                    JOptionPane.showMessageDialog(
                            null,"请选择文件!","提示",JOptionPane.OK_OPTION);
            }
        });
    }
   
    /**
     * 加密函数
     * 输入:
     * 要加密的文件,密码(由0-F组成,共48个字符,表示3个8位的密码)如:
     * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
     * 其中:
     * AD67EA2F3BE6E5AD DES密码一
     * D368DFE03120B5DF DES密码二
     * 92A8FD8FEC2F0746 DES密码三
     * 输出:
     * 对输入的文件加密后,保存到同一文件夹下增加了".tdes"扩展名的文件中。
     */
    private void encrypt(File fileIn,String sKey){
        try{
            if(sKey.length() == 48){
                byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
                byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
                byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
               
                FileInputStream fis = new FileInputStream(fileIn);
                byte[] bytIn = new byte[(int)fileIn.length()];
                for(int i = 0;i<fileIn.length();i++){
                    bytIn[i] = (byte)fis.read();
                }
//加密
                byte[] bytOut = encryptByDES(encryptByDES(
                        encryptByDES(bytIn,bytK1),bytK2),bytK3);
                String fileOut = fileIn.getPath() + ".tdes";
                FileOutputStream fos = new FileOutputStream(fileOut);
                for(int i = 0;i<bytOut.length;i++){
                    fos.write((int)bytOut[i]);
                }
                fos.close();
                JOptionPane.showMessageDialog(
                        this,"加密成功!","提示",JOptionPane.OK_OPTION);
            }else
                JOptionPane.showMessageDialog(
                        this,"密码长度必须等于48!","错误信息",JOptionPane.ERROR_MESSAGE);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
   
    /**
     * 解密函数
     * 输入:
     * 要解密的文件,密码(由0-F组成,共48个字符,表示3个8位的密码)如:
     * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
     * 其中:
     * AD67EA2F3BE6E5AD DES密码一
     * D368DFE03120B5DF DES密码二
     * 92A8FD8FEC2F0746 DES密码三
     * 输出:
     * 对输入的文件解密后,保存到用户指定的文件中。
     */
    private void decrypt(File fileIn,String sKey){
        try{
            if(sKey.length() == 48){
                String strPath = fileIn.getPath();
                if(strPath.substring(strPath.length()-5).toLowerCase().equals(".tdes"))
                    strPath = strPath.substring(0,strPath.length()-5);
                else{
                    JOptionPane.showMessageDialog(
                            this,"不是合法的加密文件!","提示",JOptionPane.OK_OPTION);
                    return;
                }
                JFileChooser chooser = new JFileChooser();
                chooser.setCurrentDirectory(new File("."));
                chooser.setSelectedFile(new File(strPath));
//用户指定要保存的文件
                int ret = chooser.showSaveDialog(this);
                if(ret==JFileChooser.APPROVE_OPTION){
                   
                    byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
                    byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
                    byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
                   
                    FileInputStream fis = new FileInputStream(fileIn);
                    byte[] bytIn = new byte[(int)fileIn.length()];
                    for(int i = 0;i<fileIn.length();i++){
                        bytIn[i] = (byte)fis.read();
                    }
//解密
                    byte[] bytOut = decryptByDES(decryptByDES(
                            decryptByDES(bytIn,bytK3),bytK2),bytK1);
                    File fileOut = chooser.getSelectedFile();
                    fileOut.createNewFile();
                    FileOutputStream fos = new FileOutputStream(fileOut);
                    for(int i = 0;i<bytOut.length;i++){
                        fos.write((int)bytOut[i]);
                    }
                    fos.close();
                    JOptionPane.showMessageDialog(
                            this,"解密成功!","提示",JOptionPane.OK_OPTION);
                }
            }else
                JOptionPane.showMessageDialog(
                        this,"密码长度必须等于48!","错误信息",JOptionPane.ERROR_MESSAGE);
        }catch(Exception e){
            JOptionPane.showMessageDialog(
                    this,"解密失败,请核对密码!","提示",JOptionPane.OK_OPTION);
        }
    }
   
    /**
     * 用DES方法加密输入的字节
     * bytKey需为8字节长,是加密的密码
     */
    private byte[] encryptByDES(byte[] bytP,byte[] bytKey) throws Exception{
        DESKeySpec desKS = new DESKeySpec(bytKey);
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
        SecretKey sk = skf.generateSecret(desKS);
        Cipher cip = Cipher.getInstance("DES");
        cip.init(Cipher.ENCRYPT_MODE,sk);
        return cip.doFinal(bytP);
    }
   
    /**
     * 用DES方法解密输入的字节
     * bytKey需为8字节长,是解密的密码
     */
    private byte[] decryptByDES(byte[] bytE,byte[] bytKey) throws Exception{
        DESKeySpec desKS = new DESKeySpec(bytKey);
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
        SecretKey sk = skf.generateSecret(desKS);
        Cipher cip = Cipher.getInstance("DES");
        cip.init(Cipher.DECRYPT_MODE,sk);
        return cip.doFinal(bytE);
    }
   
    /**
     * 输入密码的字符形式,返回字节数组形式。
     * 如输入字符串:AD67EA2F3BE6E5AD
     * 返回字节数组:{173,103,234,47,59,230,229,173}
     */
    private byte[] getKeyByStr(String str){
        byte[] bRet = new byte[str.length()/2];
        for(int i=0;i<str.length()/2;i++){
            Integer itg =
                    new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)));
            bRet[i] = itg.byteValue();
        }
        return bRet;
    }
    /**
     * 计算一个16进制字符的10进制值
     * 输入:0-F
     */
    private int getChrInt(char chr){
        int iRet=0;
        if(chr=="0".charAt(0)) iRet = 0;
        if(chr=="1".charAt(0)) iRet = 1;
        if(chr=="2".charAt(0)) iRet = 2;
        if(chr=="3".charAt(0)) iRet = 3;
        if(chr=="4".charAt(0)) iRet = 4;
        if(chr=="5".charAt(0)) iRet = 5;
        if(chr=="6".charAt(0)) iRet = 6;
        if(chr=="7".charAt(0)) iRet = 7;
        if(chr=="8".charAt(0)) iRet = 8;
        if(chr=="9".charAt(0)) iRet = 9;
        if(chr=="A".charAt(0)) iRet = 10;
        if(chr=="B".charAt(0)) iRet = 11;
        if(chr=="C".charAt(0)) iRet = 12;
        if(chr=="D".charAt(0)) iRet = 13;
        if(chr=="E".charAt(0)) iRet = 14;
        if(chr=="F".charAt(0)) iRet = 15;
        return iRet;
    }
    // Variables declaration - do not modify                    
    // End of variables declaration                  
   
}
/**
 * 文件选择组件。
 */
class FilePanel extends JPanel{
    FilePanel(String str){
        JLabel label = new JLabel(str);
        JTextField fileText = new JTextField(35);
        JButton chooseButton = new JButton("浏览...");
        this.add(label);
        this.add(fileText);
        this.add(chooseButton);
        clickAction ca = new clickAction(this);
        chooseButton.addActionListener(ca);
       
    }
   
    public String getFileName(){
        JTextField jtf = (JTextField)this.getComponent(1);
        return jtf.getText();
    }
   
    private class clickAction implements ActionListener{
        clickAction(Component c){
            cmpt = c;
        }
       
        public void actionPerformed(ActionEvent event){
            JFileChooser chooser = new JFileChooser();
            chooser.setCurrentDirectory(new File("."));
            int ret = chooser.showOpenDialog(cmpt);
            if(ret==JFileChooser.APPROVE_OPTION){
                JPanel jp = (JPanel)cmpt;
                JTextField jtf = (JTextField)jp.getComponent(1);
                jtf.setText(chooser.getSelectedFile().getPath());
            }
        }
       
        private Component cmpt;
    }
}
/**
 * 密码生成组件。
 */
class KeyPanel extends JPanel{
    KeyPanel(String str){
        JLabel label = new JLabel(str);
        JTextField fileText = new JTextField(35);
        JButton chooseButton = new JButton("随机产生");
        this.add(label);
        this.add(fileText);
        this.add(chooseButton);
        clickAction ca = new clickAction(this);
        chooseButton.addActionListener(ca);
       
    }
   
//返回生成的密码(48个字符长度)
    public String getKey(){
        JTextField jtf = (JTextField)this.getComponent(1);
        return jtf.getText();
    }
   
    private class clickAction implements ActionListener{
        clickAction(Component c){
            cmpt = c;
        }
       
        public void actionPerformed(ActionEvent event){
            try{
                KeyGenerator kg = KeyGenerator.getInstance("DES");
                kg.init(56);
                Key ke = kg.generateKey();
                byte[] bytK1 = ke.getEncoded();
                ke = kg.generateKey();
                byte[] bytK2 = ke.getEncoded();
                ke = kg.generateKey();
                byte[] bytK3 = ke.getEncoded();
               
                JPanel jp = (JPanel)cmpt;
                JTextField jtf = (JTextField)jp.getComponent(1);
                jtf.setText(getByteStr(bytK1)+getByteStr(bytK2)+getByteStr(bytK3));
            }catch(Exception e){
                e.printStackTrace();
            }
        }
       
        private String getByteStr(byte[] byt){
            String strRet = "";
            for(int i=0;i<byt.length;i++){
//System.out.println(byt[i]);
                strRet += getHexValue((byt[i]&240)/16);
                strRet += getHexValue(byt[i]&15);
            }
            return strRet;
        }
       
        private String getHexValue(int s){
            String sRet=null;
            switch (s){
                case 0: sRet = "0";break;
                case 1: sRet = "1";break;
                case 2: sRet = "2";break;
                case 3: sRet = "3";break;
                case 4: sRet = "4";break;
                case 5: sRet = "5";break;
                case 6: sRet = "6";break;
                case 7: sRet = "7";break;
                case 8: sRet = "8";break;
                case 9: sRet = "9";break;
                case 10: sRet = "A";break;
                case 11: sRet = "B";break;
                case 12: sRet = "C";break;
                case 13: sRet = "D";break;
                case 14: sRet = "E";break;
                case 15: sRet = "F";
            }
            return sRet;
        }
       
        private Component cmpt;
    }
}




摘自:http://dev.csdn.net/article/article/63/63304.shtm
posted on 2006-06-29 10:19 程序-人生 阅读(7982) 评论(6)  编辑  收藏

Feedback

# re: JAVA文件加密器(收藏) 2006-06-29 13:57 david.turing
TripleDes是
encryptByDES(encryptByDES(
encryptByDES(bytIn,bytK1),bytK2),bytK3); 的吗?呵呵  回复  更多评论
  

# re: JAVA文件加密器(收藏) 2006-06-29 14:18 dudu
请在首页发表原创文章!  回复  更多评论
  

# re: 有关JAVA文件加密与解密 2006-07-04 16:52 liaowufeng
上面这个程序有问题,当对大的文件加密时,GUI会出问题。请注意,事处线程中不要处理加解密操作,而应在事件线程中启动一个新的线程来处理。呵呵。
可参见www.javaresearch.org中我写的文件加解密工具。
  回复  更多评论
  

# re: 有关JAVA文件加密与解密 2008-06-13 15:07 路过
3M左右的东西,速度就太慢了.把我的IDE都崩了  回复  更多评论
  

# re: 有关JAVA文件加密与解密[未登录] 2008-12-28 12:47
有没运行截图啊  回复  更多评论
  

# re: 有关JAVA文件加密与解密[未登录] 2012-03-15 11:51 111
@dudu
112222121  回复  更多评论
  


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