测试加密算法

package org.com;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.junit.Test;

import sun.misc.BASE64Encoder;

public class MD5Test {
//MD5加密方法封装
public String EncoderByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException{
MessageDigest md5=MessageDigest.getInstance("MD5");//确定计算方法
BASE64Encoder base64en = new BASE64Encoder();
String newstr=base64en.encode(md5.digest(str.getBytes("utf-8")));//加密后的字符串
return newstr;
}
//MD5是不可逆加密，即不能进行解密，数据库中必须保存加密后的密匙
public boolean checkpassword(String newpasswd,String oldpasswd) throws NoSuchAlgorithmException, UnsupportedEncodingException{
if(newpasswd.equals(oldpasswd))
return true;
else
return false;
}
//获取数字签名
public String getDigitalSignature(){
String sign="";
//开始进行加密
String  string1="age=5&name=zhangshan&sex=M&price=6000";//返回的字符串拼接