package com.lh.micro.datasource.util;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

public class HMACSHA256 {

    /**

     * 将加密后的字节数组转换成字符串

     *

     * @param b 字节数组

     * @return 字符串

     */

    public  static String byteArrayToHexString(byte[] b) {

        StringBuilder hs = new StringBuilder();

        String stmp;

        for (int n = 0; b!=null && n < b.length; n++) {

            stmp = Integer.toHexString(b[n] & 0XFF);

            if (stmp.length() == 1)

                hs.append('0');

            hs.append(stmp);

        }

        return hs.toString().toLowerCase();

    }

    /**

     * sha256_HMAC加密

     * @param message 消息

     * @param secret  秘钥

     * @return 加密后字符串

     */

    public static String sha256_HMAC(String message, String secret) {

        String hash = "";

        try {

            Mac sha256_HMAC = Mac.getInstance("HmacSHA256");

            SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256");

            sha256_HMAC.init(secret_key);

            byte[] bytes = sha256_HMAC.doFinal(message.getBytes());

            hash = byteArrayToHexString(bytes);

        } catch (Exception e) {

            System.out.println("Error HmacSHA256 ===========" + e.getMessage());

        }

        return hash;

    }

}