HMAC算法加密

 /**
      * HMAC算法加密
      * @param message 待加密信息
      * @param key 密钥
      * @return
      */
     public static String HmacSHA256(byte[] message, byte[] key){
         long begin = System.currentTimeMillis();
         try {
             Mac hmacSha256Mac = Mac.getInstance("HMACSha256");
             SecretKeySpec secretKey = new SecretKeySpec(key, "HMACSha256");
             hmacSha256Mac.init(secretKey);
             byte[] result = hmacSha256Mac.doFinal(message);
             long end = System.currentTimeMillis();
             return Base64.encodeBase64String(result);
         } catch (Exception e) {
             e.printStackTrace();
             return "";
         }
     }