很多时候要对秘要进行持久化加密，此时的加密采用md5。采用对称加密的时候就采用des方法了
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import java.io.ioexception;
import java.security.messagedigest;
import java.security.securerandom;
import javax.crypto.cipher;
import javax.crypto.secretkey;
import javax.crypto.secretkeyfactory;
import javax.crypto.spec.deskeyspec;
import sun.misc.basedecoder;
import sun.misc.baseencoder;
/**
* 密匙工具类(包含des加密与md加密)
* @author mingge
*
*/
public class keysutil {
private final static string des = "des";
private final static string md = "md";
private final static string key="opeddsaeaddadbcabf";
/**
* md加密算法
* @param data
* @return
*/
public static string mdencrypt(string data) {
string resultstring = null;
try {
resultstring = new string(data);
messagedigest md = messagedigest.getinstance(md);
resultstring =bytehexstring(md.digest(resultstring.getbytes()));
} catch (exception ex) {
}
return resultstring;
}
private static string bytehexstring(byte[] bytes) {
stringbuffer bf = new stringbuffer(bytes.length * );
for (int i = ; i < bytes.length; i++) {
if ((bytes[i] & xff) < x) {
bf.append("t");
}
bf.append(long.tostring(bytes[i] & xff, ));
}
return bf.tostring();
}
/**
* description 根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws exception
*/
public static string desencrypt(string data, string key) throws exception {
if (key==null) {
key=key;
}
byte[] bt = encrypt(data.getbytes(), key.getbytes());
string strs = new baseencoder().encode(bt);
return strs;
}
/**
* description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws ioexception
* @throws exception
*/
public static string desdecrypt(string data, string key) throws ioexception,
exception {
if (data == null){
return null;
}
if (key==null) {
key=key;
}
basedecoder decoder = new basedecoder();
byte[] buf = decoder.decodebuffer(data);
byte[] bt = decrypt(buf,key.getbytes());
return new string(bt);
}
/**
* description 根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws exception
*/
private static byte[] encrypt(byte[] data, byte[] key) throws exception {
// 生成一个可信任的随机数源
securerandom sr = new securerandom();
// 从原始密钥数据创建deskeyspec对象
deskeyspec dks = new deskeyspec(key);
// 创建一个密钥工厂，然后用它把deskeyspec转换成secretkey对象
secretkeyfactory keyfactory = secretkeyfactory.getinstance(des);
secretkey securekey = keyfactory.generatesecret(dks);
// cipher对象实际完成加密操作
cipher cipher = cipher.getinstance(des);
// 用密钥初始化cipher对象
cipher.init(cipher.encrypt_mode, securekey, sr);
return cipher.dofinal(data);
}
/**
* description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws exception
*/
private static byte[] decrypt(byte[] data, byte[] key) throws exception {
// 生成一个可信任的随机数源
securerandom sr = new securerandom();
// 从原始密钥数据创建deskeyspec对象
deskeyspec dks = new deskeyspec(key);
// 创建一个密钥工厂，然后用它把deskeyspec转换成secretkey对象
secretkeyfactory keyfactory = secretkeyfactory.getinstance(des);
secretkey securekey = keyfactory.generatesecret(dks);
// cipher对象实际完成解密操作
cipher cipher = cipher.getinstance(des);
// 用密钥初始化cipher对象
cipher.init(cipher.decrypt_mode, securekey, sr);
return cipher.dofinal(data);
}
}
下面在给大家介绍一段代码关于java实现md5加密解密类
java实现md5加密以及解密类，附带测试类，具体见代码。
md5加密解密类——mymd5util,代码如下：
package com.zyg.security.md5;
import java.io.unsupportedencodingexception;
import java.security.messagedigest;
import java.security.nosuchalgorithmexception;
import java.security.securerandom;
import java.util.arrays;
public class mymd5util {
private static final string hex_nums_str="0123456789abcdef";
private static final integer salt_length = 12;
/**
* 将16进制字符串转换成字节数组
* @param hex
* @return
*/
public static byte[] hexstringtobyte(string hex) {
int len = (hex.length() / 2);
byte[] result = new byte[len];
char[] hexchars = hex.tochararray();
for (int i = 0; i < len; i++) {
int pos = i * 2;
result[i] = (byte) (hex_nums_str.indexof(hexchars[pos]) << 4
| hex_nums_str.indexof(hexchars[pos + 1]));
}
return result;
}
/**
* 将指定byte数组转换成16进制字符串
* @param b
* @return
*/
public static string bytetohexstring(byte[] b) {
stringbuffer hexstring = new stringbuffer();
for (int i = 0; i < b.length; i++) {
string hex = integer.tohexstring(b[i] & 0xff);
if (hex.length() == 1) {
hex = '0' + hex;
}
hexstring.append(hex.touppercase());
}
return hexstring.tostring();
}
/**
* 验证口令是否合法
* @param password
* @param passwordindb
* @return
* @throws nosuchalgorithmexception
* @throws unsupportedencodingexception
*/
public static boolean validpassword(string password, string passwordindb)
throws nosuchalgorithmexception, unsupportedencodingexception {
//将16进制字符串格式口令转换成字节数组
byte[] pwdindb = hexstringtobyte(passwordindb);
//声明盐变量
byte[] salt = new byte[salt_length];
//将盐从数据库中保存的口令字节数组中提取出来
system.arraycopy(pwdindb, 0, salt, 0, salt_length);
//创建消息摘要对象
messagedigest md = messagedigest.getinstance("md5");
//将盐数据传入消息摘要对象
md.update(salt);
//将口令的数据传给消息摘要对象
md.update(password.getbytes("utf-8"));
//生成输入口令的消息摘要
byte[] digest = md.digest();
//声明一个保存数据库中口令消息摘要的变量
byte[] digestindb = new byte[pwdindb.length - salt_length];
//取得数据库中口令的消息摘要
system.arraycopy(pwdindb, salt_length, digestindb, 0, digestindb.length);
//比较根据输入口令生成的消息摘要和数据库中消息摘要是否相同
if (arrays.equals(digest, digestindb)) {
//口令正确返回口令匹配消息
return true;
} else {
//口令不正确返回口令不匹配消息
return false;
}
}
/**
* 获得加密后的16进制形式口令
* @param password
* @return
* @throws nosuchalgorithmexception
* @throws unsupportedencodingexception
*/
public static string getencryptedpwd(string password)
throws nosuchalgorithmexception, unsupportedencodingexception {
//声明加密后的口令数组变量
byte[] pwd = null;
//随机数生成器
securerandom random = new securerandom();
//声明盐数组变量
byte[] salt = new byte[salt_length];
//将随机数放入盐变量中
random.nextbytes(salt);
//声明消息摘要对象
messagedigest md = null;
//创建消息摘要
md = messagedigest.getinstance("md5");
//将盐数据传入消息摘要对象
md.update(salt);
//将口令的数据传给消息摘要对象
md.update(password.getbytes("utf-8"));
//获得消息摘要的字节数组
byte[] digest = md.digest();
//因为要在口令的字节数组中存放盐，所以加上盐的字节长度
pwd = new byte[digest.length + salt_length];
//将盐的字节拷贝到生成的加密口令字节数组的前12个字节，以便在验证口令时取出盐
system.arraycopy(salt, 0, pwd, 0, salt_length);
//将消息摘要拷贝到加密口令字节数组从第13个字节开始的字节
system.arraycopy(digest, 0, pwd, salt_length, digest.length);
//将字节数组格式加密后的口令转化为16进制字符串格式的口令
return bytetohexstring(pwd);
}
}
测试类——client,代码如下：
package com.zyg.security.md5;
import java.io.unsupportedencodingexception;
import java.security.nosuchalgorithmexception;
import java.util.hashmap;
import java.util.map;
public class client {
private static map users = new hashmap();
public static void main(string[] args){
string username = "zyg";
string password = "123";
registeruser(username,password);
username = "changong";
password = "456";
registeruser(username,password);
string loginuserid = "zyg";
string pwd = "1232";
try {
if(loginvalid(loginuserid,pwd)){
system.out.println("欢迎登陆！！！");
}else{
system.out.println("口令错误，请重新输入！！！");
}
} catch (nosuchalgorithmexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (unsupportedencodingexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
/**
* 注册用户
*
* @param username
* @param password
*/
public static void registeruser(string username,string password){
string encryptedpwd = null;
try {
encryptedpwd = mymd5util.getencryptedpwd(password);
users.put(username, encryptedpwd);
} catch (nosuchalgorithmexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (unsupportedencodingexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
/**
* 验证登陆
*
* @param username
* @param password
* @return
* @throws unsupportedencodingexception
* @throws nosuchalgorithmexception
*/
public static boolean loginvalid(string username,string password)
throws nosuchalgorithmexception, unsupportedencodingexception{
string pwdindb = (string)users.get(username);
if(null!=pwdindb){ // 该用户存在
return mymd5util.validpassword(password, pwdindb);
}else{
system.out.println("不存在该用户！！！");
return false;
}
}
}
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