下面实例讲述了Java消息摘要算法MAC实现与应用。分享给大家供大家参考，具体如下：

一 介绍

MAC：Message Authentication CodeHMAC：keyed-Hash Message Authencication Code,含有密钥的散列函数算法。

融合MD、SHA

MD系列：HmacMD2、HmacMD4、HmacMD5

SHA系列：HmacSHA1、HmacSHA224、HmacSHA256、HmacSHA384、HmacSHA512

应用：SecureCRT

二 参数说明

三 代码实现

package com.imooc.security.hmac;import javax.crypto.KeyGenerator;

import javax.crypto.Mac;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Hex;

import org.bouncycastle.crypto.digests.MD5Digest;

import org.bouncycastle.crypto.macs.HMac;

import org.bouncycastle.crypto.params.KeyParameter;

public class ImoocHmac {    

private static String src = "cakin24 security hmac";    

public static void main(String[] args) {         jdkHmacMD5();         

bcHmacMD5();

    }    

public static void jdkHmacMD5() {        

try {            

KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5");

//初始化KeyGenerator            

SecretKey secretKey = keyGenerator.generateKey();

//产生密钥//            

byte[] key = secretKey.getEncoded();

//获得密钥            

byte[] key = Hex.decodeHex(new char[] {'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'});            

SecretKey restoreSecretKey = new SecretKeySpec(key, "HmacMD5");

//还原密钥            

Mac mac = Mac.getInstance(restoreSecretKey.getAlgorithm());

//实例化MAC            

mac.init(restoreSecretKey);

//初始化Mac            

byte[] hmacMD5Bytes = mac.doFinal(src.getBytes());

//执行摘要            

System.out.println("jdk hmacMD5 : " + Hex.encodeHexString(hmacMD5Bytes));

        } 

catch (Exception e) {            e.printStackTrace();

        }    }    

public static void bcHmacMD5() {        

HMac hmac = new HMac(new MD5Digest());        

hmac.init(new KeyParameter(org.bouncycastle.util.encoders.Hex.decode("aaaaaaaaaa")));        hmac.update(src.getBytes(), 0, src.getBytes().length);        

byte[] hmacMD5Bytes = new byte[hmac.getMacSize()];

//执行摘要        

hmac.doFinal(hmacMD5Bytes, 0);        

System.out.println("bc hmacMD5 : " + org.bouncycastle.util.encoders.Hex.toHexString(hmacMD5Bytes));

    }}

四 实现效果

jdk hmacMD5 : d23aa029b2bacdd3979d10f0931f9af6bc hmacMD5 : d23aa029b2bacdd3979d10f0931f9af6