package com.javaonly.hmac.test;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
import javax.crypto.Mac;

public class ComputopTest {

    public static void main(String args[]) throws NoSuchAlgorithmException,
            KeyManagementException,
             InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {

        String macKey = "The HMAC key";
        String macData ="the data string"
        System.out.println("MACDATA:"+macData);

        Mac mac = Mac.getInstance("HmacSHA256");
                //get the bytes of the hmac key and data string
        byte[] secretByte = macKey.getBytes("UTF-8");
        byte[] dataBytes = macData.getBytes("UTF-8");
        SecretKey secret = new SecretKeySpec(secretByte, "HMACSHA256");

        mac.init(secret);
        byte[] doFinal = mac.doFinal(dataBytes);
        byte[] hexB = new Hex().encode(doFinal);
        String checksum = new String(hexB);

    }
}
//该片段来自于http://yuncode.net