本系统包含五个模块，注冊模块、登录模块、RSA算法模块、DES算法模块、MD5算法模块。
这五个模块每个实现不同的功能。
注冊模块实现将username和password写入文件里，登录模块则负责将其读入而且推断其是否正确。RSA算法模块实现生成密钥对、加密和解密功能。
DES算法模块实现加密和解密功能。MD5算法模块是实现生成摘要的功能。
（1）、首先为注冊界面：
package test;
import javax.swing.*;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.PrintWriter;
import java.io.FileWriter;
import java.io.IOException;
public class regist {
public static void main(String[] args){
register a = new register();
}
}
class register extends JFrame {
JTextField jTextField ;//定义文本框组件
JPasswordField jPasswordField;//定义password框组件
public register(){
jTextField = new JTextField(12);
jPasswordField = new JPasswordField(12);
JLabel jLabel1,jLabel2;
JPanel jp1,jp2,jp3;
JButton jb1,jb2; //创建button
jLabel1 = new JLabel("username");
jLabel2 = new JLabel("密 码");
jb1 = new JButton("注冊");
jb2 = new JButton("取消");
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jb1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
Jb1_actionPerformed();
}
});
jb2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
Jb2_actionPerformed();
}
});
//设置布局
this.setLayout(new GridLayout(3,1));
jp1.add(jLabel1);
jp1.add(jTextField);//第一块面板加入username和文本框
jp2.add(jLabel2);
jp2.add(jPasswordField);//第二块面板加入password和password输入框
jp3.add(jb1);
jp3.add(jb2); //第三块面板加入确认和取消
//jp3.setLayout(new FlowLayout()); //由于JPanel默认布局方式为FlowLayout，所以能够注销这段代码.
this.add(jp1);
this.add(jp2);
this.add(jp3); //将三块面板加入到登陆框上面
//设置显示
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("用户注冊界面");
}
//点击注冊时发生的结果
public void Jb1_actionPerformed( ){
<span style="font-family:宋体;">//推断username和password是否为空</span>
if(jTextField.getText().length()== 0){
JOptionPane.showOptionDialog(this, "username不能为空","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}
else if(jPasswordField.getPassword().length== 0){
JOptionPane.showOptionDialog(this, "password不能为空","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}
if((jTextField.getText().length()!= 0)&&(jPasswordField.getPassword().length!= 0)){
/*System.out.println(jTextField.getText());
System.out.println(jPasswordField.getPassword());*/
String str1=jTextField.getText();
String user = MD5.getMD5Str(str1);
char[] str2 = jPasswordField.getPassword();
String str = String.valueOf(str2);
String pwd = MD5.getMD5Str(str);
FileWriter writer;
try {
writer = new FileWriter("d:/abc.txt");
writer.write(user);
writer.write(" ");
writer.write(pwd);
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
this.dispose();
// new denglu();//进入登录页面
}
}
//点击取消，产生的结果
public void Jb2_actionPerformed(){
this.dispose();
// new index();//进入主页面
}
}
注冊界面如图所看到的，注冊后会在D盘生成一个abc.txt的文件，会将password用MD5加密后再存入文件里。
（2）、第二步为注冊界面：
注冊界面执行和登录页面相似。将username和password输入后，将username和用MD5加密后的password与文件里读取的username和MD5加密后的password进行对照。假设相等则进入算法界面，否则，不能进入。
package test;
import javax.swing.*;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
//主函数
public class login {
public static void main(String[] args){
denglu a = new denglu();
}
}
//页面显示内容
class denglu extends JFrame {
JTextField jTextField ;//定义文本框组件
JPasswordField jPasswordField;//定义password框组件
public denglu(){
jTextField = new JTextField(12);
jPasswordField = new JPasswordField(12);
JLabel jLabel1,jLabel2;
JPanel jp1,jp2,jp3;
JButton jb1,jb2; //创建button
jLabel1 = new JLabel("username");
jLabel2 = new JLabel("密 码");
jb1 = new JButton("登录");
jb2 = new JButton("取消");
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jb1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
Jb1_actionPerformed();
}
});
jb2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
Jb2_actionPerformed();
}
});
//设置布局
this.setLayout(new GridLayout(3,1));
jp1.add(jLabel1);
jp1.add(jTextField);//第一块面板加入username和文本框
jp2.add(jLabel2);
jp2.add(jPasswordField);//第二块面板加入password和password输入框
jp3.add(jb1);
jp3.add(jb2); //第三块面板加入确认和取消
// jp3.setLayout(new FlowLayout()); //由于JPanel默认布局方式为FlowLayout，所以能够注销这段代码.
this.add(jp1);
this.add(jp2);
this.add(jp3); //将三块面板加入到登陆框上面
//设置显示
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("用户登陆界面");
}
//控制登录button的监听器
public void Jb1_actionPerformed( ){
String name = jTextField.getText();
String user = MD5.getMD5Str(name);
//由于password框获取的值是乱码，所以用String.valueOf将他转换成字符串
String password = String.valueOf(jPasswordField.getPassword());
String pwd = MD5.getMD5Str(password);
/*System.out.println("name="+name);
System.out.println("password="+password);*/
//推断username和password是否为空
if(name.length()== 0){
JOptionPane.showOptionDialog(this, "username不能为空","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}else if(password.length() == 0){
JOptionPane.showOptionDialog(this, "password不能为空","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}
//读取文件
if((name.length()!= 0)&&(password.length() != 0)){
try {
Scanner in = new Scanner(new File("d:/abc.txt"));
String str = in.nextLine();
String strr = str.trim();
String[] abc = strr.split("[\p{Space}]+"); //以空格来分
String str1 = abc[0];//得到的是文件里的username
String str2 = abc[1]; //得到的是文件里的password
if(abc[1] != null){
Pattern p = Pattern.compile("
");
Matcher m = p.matcher(abc[1]);
str2 = m.replaceAll("");
}
//用来測试查看文件里读取的字符串与表单中的字符串是否相等
/*System.out.println("比較username="+name.equals(str1));
System.out.println("比較password="+password.equals(str2));*/
//推断输入的username与文件里得到的username是否同样
if(user.equals(str1)){
//推断输入的password与文件里得到的password是否同样
if(pwd.equals(str2)){
this.dispose();
new Algorithm();
}else{
JOptionPane.showOptionDialog(this, "password错误","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}
}else{
JOptionPane.showOptionDialog(this, "username错误","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
//控制取消button的监听器
public void Jb2_actionPerformed(){
this.dispose();
//new index();//<span style="font-family:宋体;">返回主页面</span>
}
}
（3）、RSA算法
（1）设计密钥：
(a) 在离线方式下。先产生两个足够大的强质数p、q；
(b) 令n=p＊q。计算欧拉函数f(n)=(p-1)×(q-1)；
(c) 选取一个与f(n)互素的奇数e，称e为公开指数。
(d) 依据e×d=1 mod(f(n))。找出d；
(e) 舍弃p和q （但绝不能泄露） ，公开(n，e)，公钥；
(f) 保密(n。d) 。私钥。
（2）加密：
对于明文M，用公钥 (n。e) 加密可得到密文C。
C = Me mod (n)
（3）解密：
对于密文C，用私钥(n，d)解密可得到明文M。
M = Cd mod (n)
首先生成公私密钥对的代码：
package test;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import javax.swing.*;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class rsakeypair {
public static void main(String []args)throws Exception {
new keypair();
}
}
class keypair extends JFrame{
JTextField t1,t2,t3;
JButton b1,b2,b3;
JLabel l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13;
JPanel p1,p2,p3,p4,p5,p6;
public static long p;
public static long q;
public static long e;
public static long d;
public static long n;
public static long m;
//求最大公约数
public long gcd(long a,long b) {
long gcd;
if(b==0) gcd=a;
else gcd=gcd(b,a%b);
return gcd;
}
public long getd(long e ,long m) {
long value=1;
long d = 0;
for(int i=1;;i++) {
value=i * m+1;
/*System.out.println("value: "+value); */
if((value%e==0)&& (value/e < m)) {
d= value/e;
break;
}
}
return d;
}
//推断是否为素数
public boolean primenumber(long t) {
long k=0;
k=(long)Math.sqrt((double)t);
boolean flag=true;
outer:for(int i=2;i<=k;i++) {
if((t%i)==0) {
flag = false; break outer;
}
}
return flag;
}
public keypair(){
t1 = new JTextField(12);
t2 = new JTextField(12);
t3 = new JTextField(12);
b1 = new JButton("生成公钥");
b2 = new JButton("生成私钥");
b3 = new JButton("返回");
l1 = new JLabel("输入p：");
l2 = new JLabel("输入q：");
l3 = new JLabel("输入e：");
l4 = new JLabel();
l5 = new JLabel();
l6 = new JLabel("(");
l7 = new JLabel(",");
l8 = new JLabel(")");
l9 = new JLabel("(");
l10 = new JLabel(",");
l11 = new JLabel(")");
l12 = new JLabel();
l13 = new JLabel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
p6 = new JPanel();
this.setLayout(new GridLayout(6,1));
p1.add(l1);
p1.add(t1);
p2.add(l2);
p2.add(t2);
p3.add(l3);
p3.add(t3);
p4.add(b1);
p4.add(l6);
p4.add(l4);
p4.add(l7);
p4.add(l12);
p4.add(l8);
p5.add(b2);
p5.add(l9);
p5.add(l13);
p5.add(l10);
p5.add(l5);
p5.add(l11);
p6.add(b3);
b1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B1_actionPerformed();
}
});
b2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B2_actionPerformed();
}
});
b3.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B3_actionPerformed();
}
});
this.add(p1);
this.add(p2);
this.add(p3);
this.add(p4);
this.add(p5);
this.add(p6);
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("生成密钥对");
}
public void B1_actionPerformed(){
p = Integer.parseInt(t1.getText());
q = Integer.parseInt(t2.getText());
e = Integer.parseInt(t3.getText());
n = p * q ;
m = (p-1)*(q-1);
d = getd(e,m);
String x = String.valueOf(n);
String y = String.valueOf(e);
if(!primenumber(p)){
JOptionPane.showOptionDialog(this, "输入p不合法","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}else{
if(!primenumber(q)){
JOptionPane.showOptionDialog(this, "输入q不合法","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}else{
if((e >= m) || (gcd (m,e)!=1)){
JOptionPane.showOptionDialog(this, "输入e不合法","错误信息", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null);
}else{
l4.setText(x);
l12.setText(y);
}
}
}
}
public void B2_actionPerformed(){
p = Integer.parseInt(t1.getText());
q = Integer.parseInt(t2.getText());
e = Integer.parseInt(t3.getText());
n = p * q ;
m = (p-1)*(q-1);
d = getd(e,m);
String x = String.valueOf(n);
String y = String.valueOf(d);
l13.setText(x);
l5.setText(y);
}
public void B3_actionPerformed(){
this.dispose();
new rsashow();
}
}
RSA算法中的加密算法：
package test;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.math.*;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class rsaencryption {
public static void main (String args[]){
new encryption();
}
}
class encryption extends JFrame{
JTextField t1,t2,t3;
JButton b1,b2;
JLabel l1,l2,l3,l4;
JPanel p1,p2,p3,p4,p5;
public static BigInteger n ;
public static int e;
public static BigInteger ming;
/*
* A測试数据：
* p=13171
* q= 35911
* n = 472983781
* e= 17149
* d=281295349
* 明文：88888888
* 密文：347002949
* qq号:348257309
* qq号加密后：410467256
*/
//加密、解密计算
public BigInteger colum(BigInteger y,BigInteger n,int key) {
BigInteger mul= BigInteger.ONE ;
y = y.remainder(n);
while(key > 0){
if(key %2 == 1){
mul = mul.multiply(y).remainder(n);
}
key = key/2;
y = y.multiply(y).remainder(n);
}
return mul;
}
public encryption(){
t1 = new JTextField(12);
t2 = new JTextField(12);
t3 = new JTextField(12);
b1 = new JButton("加密");
b2 = new JButton("返回");
l1 = new JLabel("输入公钥中的第一个数n：");
l2 = new JLabel("输入公钥中的第二个数e：");
l3 = new JLabel("输入明文：");
l4 = new JLabel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
this.setLayout(new GridLayout(5,1));
p1.add(l1);
p1.add(t1);
p2.add(l2);
p2.add(t2);
p3.add(l3);
p3.add(t3);
p4.add(b1);
p4.add(l4);
p5.add(b2);
b1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B1_actionPerformed();
}
});
b2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B2_actionPerformed();
}
});
this.add(p1);
this.add(p2);
this.add(p3);
this.add(p4);
this.add(p5);
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("加密算法");
}
public void B1_actionPerformed(){
long a = Integer.parseInt(t1.getText());
long c = Integer.parseInt(t3.getText());
n = BigInteger.valueOf(a);
e = Integer.parseInt(t2.getText());
ming = BigInteger.valueOf(c);
BigInteger secretword=colum(ming,n,e);
String x = String.valueOf(secretword);
l4.setText(x);
}
public void B2_actionPerformed(){
this.dispose();
new rsashow();
}
}RSA算法中解密算法的代码：
package test;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class rsadecrypt {
public static void main (String args[]){
new decrypt();
}
}
class decrypt extends JFrame{
JTextField t1,t2,t3;
JButton b1,b2;
JLabel l1,l2,l3,l4;
JPanel p1,p2,p3,p4,p5;
public static BigInteger n ;
public static int d;
public static BigInteger mi;
/*
* B測试数据：
p:17327
q:11311
n:195985697
e:73559
d:153728219
明文：88888888
密文：141349150
*/
//加密、解密计算
public BigInteger colum(BigInteger y,BigInteger n,int key) {
BigInteger mul= BigInteger.ONE ;
y = y.remainder(n);
while(key > 0){
if(key %2 == 1){
mul = mul.multiply(y).remainder(n);
}
key = key/2;
y = y.multiply(y).remainder(n);
}
return mul;
}
public decrypt(){
t1 = new JTextField(12);
t2 = new JTextField(12);
t3 = new JTextField(12);
b1 = new JButton("解密");
b2 = new JButton("返回");
l1 = new JLabel("输入私钥中的第一个数n：");
l2 = new JLabel("输入私钥中的第二个数d：");
l3 = new JLabel("输入密文：");
l4 = new JLabel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
this.setLayout(new GridLayout(5,1));
p1.add(l1);
p1.add(t1);
p2.add(l2);
p2.add(t2);
p3.add(l3);
p3.add(t3);
p4.add(b1);
p4.add(l4);
p5.add(b2);
b1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B1_actionPerformed();
}
});
b2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
B2_actionPerformed();
}
});
this.add(p1);
this.add(p2);
this.add(p3);
this.add(p4);
this.add(p5);
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("解密算法");
}
public void B1_actionPerformed(){
long a = Integer.parseInt(t1.getText());
//long b = Integer.parseInt(t2.getText());
long c = Integer.parseInt(t3.getText());
n = BigInteger.valueOf(a);
d = Integer.parseInt(t2.getText());
mi = BigInteger.valueOf(c);
BigInteger word=colum(mi,n,d);
String x = String.valueOf(word);
l4.setText(x);
}
public void B2_actionPerformed(){
this.dispose();
new rsashow();
}
}（4）、DES算法
package test;
//加密随机类
import java.security.SecureRandom;
//提供加密和解密加密
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.swing.*;
import java.awt.*; //导入必要的包
import java.awt.event.*;
public class destest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自己主动生成的方法存根
//待加密内容
/* String str = "kale123456789";
//密码。长度要是8的倍数
String password = "12345678";
byte[] result = null;
try{
result = DES.desLock(str.getBytes(),password);
System.out.println("加密后内容为："+new String(result));
}
catch(Exception e){
System.out.println("加密失败。");
}
//解密
try {
byte[] unLockResult = DES.desUnclock(result, password);
System.out.println("解密后内容为："+new String(unLockResult));
}
catch (Exception e1) {
//e1.printStackTrace();
System.out.println("密钥错误。无法解密！");
}*/
new desshow();
}
}
class desshow extends JFrame{
JTextField t1,t2;
JButton b1,b2,b3;
JLabel l1,l2,l3,l4,l5,l6;
JPanel p1,p2,p3,p4,p5;
public desshow(){
t1 = new JTextField(12);
t2 = new JTextField(12);
b1 = new JButton("加密");
b2 = new JButton("解密");
b3 = new JButton("返回");
l1 = new JLabel("输入明文：");
l2 = new JLabel("输入密钥：");//加密密钥和解密密钥（加密密钥和解密密钥是一样的）
l3 = new JLabel("加密后的结果：");
l4 = new JLabel();
l5 = new JLabel("解密后的结果：");
l6 = new JLabel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();
this.setLayout(new GridLayout(5,1));
p1.add(l1);
p1.add(t1);
p2.add(l2);
p2.add(t2);
p3.add(b1);
p3.add(l3);
p3.add(l4);
p4.add(b2);
p4.add(l5);
p4.add(l6);
p5.add(b3);
b1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
J1_actionPerformed();
}
});
b2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
J2_actionPerformed();
}
});
b3.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
J3_actionPerformed();
}
});
this.add(p1);
this.add(p2);
this.add(p3);
this.add(p4);
this.add(p5);
this.setBounds(100, 100, 300, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("des算法");
}
//待加密内容
String str ;
//密码，长度要是8的倍数
String password ;
public byte[] result = null;
public void J1_actionPerformed(){
str = t1.getText();
password = t2.getText();
try{
result = DES.desLock(str.getBytes(),password);
//System.out.println("加密后内容为："+new String(result));
l4.setText(new String(result));
}
catch(Exception e){
//System.out.println("加密失败！");
l4.setText("加密失败");
}
}
//byte[] result2= DES.desLock(str.getBytes(),password);
public void J2_actionPerformed(){
try {
byte[] unLockResult = DES.desUnclock(result, password);
//System.out.println("解密后内容为："+new String(unLockResult));
l6.setText(new String(unLockResult));
}
catch (Exception e1) {
//e1.printStackTrace();
//System.out.println("密钥错误，无法解密！");
l6.setText("密钥错误。无法解密。");
}
}
public void J3_actionPerformed(){
this.dispose();
new Algorithm();
}
}
/*
* DES加密介绍
DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用同样密钥的算法。
DES加密算法出自IBM的研究。后来被美国政府正式採用，之后開始广泛流传，可是近些年使用越来越少。
由于DES使用56位密钥，以现代计算能力。24小时内就可以被破解。尽管如此，在某些简单应用中，我们还是可
以 使用DES加密算法，本文简单解说DES的JAVA实现。
*/
class DES{
/**
* 加密过程，密钥长度都必须是8的倍数
* @param datasource
* @param password
* @return 加密后的结果
*/
public static byte[] desLock(byte[] datasource, String password) {
try{
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(password.getBytes());
//创建一个密匙工厂。然后用它把DESKeySpec转换成
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(desKey);
//Cipher对象实际完毕加密操作
Cipher cipher = Cipher.getInstance("DES");
//用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
//如今。获取数据并加密
//正式运行加密操作
return cipher.doFinal(datasource);
}catch(Throwable e){
e.printStackTrace();
}
return null;
}
/**
* 解密过程，密钥长度都必须是8的倍数
* @param src
* @param password
* @return 解密后的内容
* @throws Exception
*/
public static byte[] desUnclock(byte[] src, String password) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(password.getBytes());
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 将DESKeySpec对象转换成SecretKey对象
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完毕解密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, random);
// 真正開始解密操作
return cipher.doFinal(src);
}
}
（5）、MD5算法
package test;
import javax.swing.*;
import java.awt.*; //导入必要的包
import java.awt.event.*;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.swing.JTextField;
/*
* 数据：helloworld
* 摘要：38a57032085441e7
* qq号:348257309
* * qq号加密后：410467256
* */
public class md5test {
/**
* @param args
*/
public static void main(String[] args) {
/* String password = "123456789";
String result = MD5.getMD5Str(password);
System.out.println(result.toLowerCase());*/
new md5show();
}
}
class md5show extends JFrame{
JTextField jTextField = new JTextField(12);
JLabel jl1,jl2 ;
JPanel p1,p2,p3;
JButton j1,j2;
public md5show(){
jl1= new JLabel("请输入要生成摘要的数据：");
jl2 =new JLabel();
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
this.setLayout(new GridLayout(3,1));
p1.add(jl1);
p1.add(jTextField);
j1 = new JButton("生成摘要");
j2 = new JButton("返回");
p2.add(j1);
p2.add(jl2);
p3.add(j2);
j1.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
J1_actionPerformed();
}
});
j2.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e) {
J2_actionPerformed();
}
});
this.add(p1);
this.add(p2);
this.add(p3);
this.setBounds(300, 300, 400, 300);
//this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setTitle("MD5算法");
}
public void J1_actionPerformed(){
String password = jTextField.getText();
String result = MD5.getMD5Str(password);
jl2.setText(result.toLowerCase());
}
public void J2_actionPerformed(){
this.dispose();
new Algorithm();
}
}
class MD5 {
/*
* MD5加密
*/
public static String getMD5Str(String str) {
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.reset();
messageDigest.update(str.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
System.out.println("NoSuchAlgorithmException caught!");
System.exit(-1);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
byte[] byteArray = messageDigest.digest();
StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
else
md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
//16位加密，从第9位到25位
return md5StrBuff.substring(8, 24).toString().toUpperCase();
}
}
源码：
http://download.csdn.net/detail/bluedream1219/8906279