消息摘要算法MAC实现与应用

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一 介绍

MAC：Message Authentication Code

HMAC：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KeyGeneratorSecretKey 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MACmac.init(restoreSecretKey);//初始化Macbyte[] 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 : d23aa029b2bacdd3979d10f0931f9af6

bc hmacMD5 : d23aa029b2bacdd3979d10f0931f9af6

五 应用场景

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