MAC消息摘要

   MAC算法结合了MD5和SHA算法的优势, 并加入了密钥的支持, 是一种更为安全的消息摘要算法.

 

1. 环境

 

jdk1.6

commons-codec-1.4.jar

 

2. 代码

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

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

public class MACCipher {
   
    public static byte[] initHmacMD5Key() throws Exception{
        // 初始化KeyGenerator
        KeyGenerator kg = KeyGenerator.getInstance("HmacMD5");
        //产生密钥
        SecretKey secretKey = kg.generateKey();
        //获得密钥
        return secretKey.getEncoded();
    }
   
    public static byte[] encodeHmacMD5(byte[] data, byte[] key)throws Exception{
        // 还原密钥
        SecretKey secretKey = new SecretKeySpec(key, "HmacMD5");
        // 实例化Mac
        Mac mac = Mac.getInstance(secretKey.getAlgorithm());
        // 初始化Mac
        mac.init(secretKey);
        // 执行消息摘要
        return mac.doFinal(data);
    }
   
    public static String hmacmd5Hex(byte[] data, byte[] key)throws Exception{
        return Hex.encodeHexString(encodeHmacMD5(data, key));
    }
   
    public static byte[] initHmacSHA512Key()throws Exception{
        // 初始化KeyGenerator
        KeyGenerator kg = KeyGenerator.getInstance("HmacSHA512");
        //产生密钥
        SecretKey secretKey = kg.generateKey();
        //获得密钥
        return secretKey.getEncoded();
    }
   
    public static byte[] encodeHmacSHA512(byte[] data, byte[] key)throws Exception{
        // 还原密钥
        SecretKey secretKey = new SecretKeySpec(key, "HmacSHA512");
        // 实例化Mac
        Mac mac = Mac.getInstance(secretKey.getAlgorithm());
        // 初始化Mac
        mac.init(secretKey);
        // 执行消息摘要
        return mac.doFinal(data);
    }
   
    public static String hmacsha512Hex(byte[] data, byte[] key)throws Exception{
        return Hex.encodeHexString(encodeHmacSHA512(data, key));
    }
}

 

3. 测试代码

 

String macmd5Data = MACCipher.hmacmd5Hex("HmacMD5编码".getBytes(), MACCipher.initHmacMD5Key());
        System.out.println(macmd5Data);
        String macsha512Data = MACCipher.hmacsha512Hex("HmacSHA512编码".getBytes(), MACCipher.initHmacSHA512Key());
        System.out.println(macsha512Data);