MD5文件加密和解密

举个例子：

import java.awt.*;
import java.awt.event.*;import java.io.*;import java.security.*;import javax.crypto.*;
import javax.crypto.spec.*;import javax.swing.*;/**
文件名：FileEncrypter.java
JDK：1.40以上
说明：文件加密
加密方法：三重DES加密
加密过程：对选中的文件加密后在同文件夹下生成一个增加了".tdes"
扩展名的加密文件
解密过程：对选中的加密文件（必须有".tdes"扩展名）进行解密
*/
public class FileEncrypter extends JFrame {public static final int WIDTH = 550;public static final int HEIGHT = 200;FileEncrypter() {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);}}});}public static void main(String[] args) {FileEncrypter fe = new FileEncrypter();fe.show();}/**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;}
}/**
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 {private Component cmpt;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());}}}
}/**
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 {private Component cmpt;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;}}
}

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