MAC算法主要用于消息验证

以下为算法实现：

import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.xml.bind.annotation.adapters.HexBinaryAdapter;public class Main {static String src = "Hello,sahadev!";public static void main(String[] args) {HmacMD5();}public static void HmacMD5() {try {// 获取密钥生成器KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5");// 生成密钥SecretKey generateKey = keyGenerator.generateKey();// 获取"Message Authentication Code" (MAC) algorithm实例Mac instance = Mac.getInstance(generateKey.getAlgorithm());// 根据生产的密钥初始化该实例instance.init(generateKey);// 加密消息byte[] doFinal = instance.doFinal(src.getBytes());// 输出加密后的消息System.out.println("HmacMD5 : "+ new HexBinaryAdapter().marshal(doFinal));} catch (Exception e) {e.printStackTrace();}}}