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();
		}
	}

}