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("文件選擇");
??????? c.add(fp);
???????
??????? final KeyPanel pp = new KeyPanel("密碼");
??????? 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,"請選擇文件！","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,"請選擇文件！","提示",JOptionPane.OK_OPTION);
??????????? }
??????? });
??? }
???
??? /**
???? * 加密函數(shù)
???? * 輸入：
???? * 要加密的文件，密碼（由0-F組成，共48個字符，表示3個8位的密碼）如：
???? * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
???? * 其中：
???? * AD67EA2F3BE6E5AD DES密碼一
???? * D368DFE03120B5DF DES密碼二
???? * 92A8FD8FEC2F0746 DES密碼三
???? * 輸出：
???? * 對輸入的文件加密后，保存到同一文件夾下增加了".tdes"擴(kuò)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,"密碼長度必須等于48！","錯誤信息",JOptionPane.ERROR_MESSAGE);
??????? }catch(Exception e){
??????????? e.printStackTrace();
??????? }
??? }
???
??? /**
???? * 解密函數(shù)
???? * 輸入：
???? * 要解密的文件，密碼（由0-F組成，共48個字符，表示3個8位的密碼）如：
???? * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
???? * 其中：
???? * AD67EA2F3BE6E5AD DES密碼一
???? * D368DFE03120B5DF DES密碼二
???? * 92A8FD8FEC2F0746 DES密碼三
???? * 輸出：
???? * 對輸入的文件解密后，保存到用戶指定的文件中。
???? */
??? 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));
//用戶指定要保存的文件
??????????????? 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,"密碼長度必須等于48！","錯誤信息",JOptionPane.ERROR_MESSAGE);
??????? }catch(Exception e){
??????????? JOptionPane.showMessageDialog(
??????????????????? this,"解密失敗，請核對密碼！","提示",JOptionPane.OK_OPTION);
??????? }
??? }
???
??? /**
???? * 用DES方法加密輸入的字節(jié)
???? * bytKey需為8字節(jié)長，是加密的密碼
???? */
??? 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方法解密輸入的字節(jié)
???? * bytKey需為8字節(jié)長，是解密的密碼
???? */
??? 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);
??? }
???
??? /**
???? * 輸入密碼的字符形式，返回字節(jié)數(shù)組形式。
???? * 如輸入字符串：AD67EA2F3BE6E5AD
???? * 返回字節(jié)數(shù)組：{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;
??? }
??? /**
???? * 計算一個16進(jìn)制字符的10進(jìn)制值
???? * 輸入：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??????????????????
???
}
/**
?* 文件選擇組件。
?*/
class FilePanel extends JPanel{
??? FilePanel(String str){
??????? JLabel label = new JLabel(str);
??????? JTextField fileText = new JTextField(35);
??????? JButton chooseButton = new JButton("瀏覽...");
??????? 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;
??? }
}
/**
?* 密碼生成組件。
?*/
class KeyPanel extends JPanel{
??? KeyPanel(String str){
??????? JLabel label = new JLabel(str);
??????? JTextField fileText = new JTextField(35);
??????? JButton chooseButton = new JButton("隨機(jī)產(chǎn)生");
??????? this.add(label);
??????? this.add(fileText);
??????? this.add(chooseButton);
??????? clickAction ca = new clickAction(this);
??????? chooseButton.addActionListener(ca);
???????
??? }
???
//返回生成的密碼（48個字符長度）
??? 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