微信Token验证

        /// <summary>
        /// 微信验证
        /// </summary>
        /// <param name="echostr"></param>
        /// <param name="signature"></param>
        /// <param name="timestamp"></param>
        /// <param name="nonce"></param>
        /// <returns></returns>
        public IActionResult WeChatSign(string echostr,string signature,string timestamp,string nonce)
        {
            string _token = "HanLiKongGu";

            if (CheckSignAture(_token, timestamp, nonce, signature))
            {
                if (!string.IsNullOrEmpty(echostr))
                {
                    return Content(echostr);
                }
            }
            return Content("Error");
        }

        /// <summary>
        /// 验证签名是否一致
        /// </summary>
        /// <param name="token">微信平台设置的口令</param>
        /// <param name="timestamp">时间戳</param>
        /// <param name="nonce">随机数</param>
        /// <param name="signature">微信加密签名</param>
        /// <returns></returns>
        public bool CheckSignAture(string token, string timestamp, string nonce, string signature)
        {
            string[] strs = new string[] { token, timestamp, nonce };//把参数放到数组
            Array.Sort(strs);//加密/校验流程1、数组排序
            string sign = string.Join("", strs);
            sign = GetSHA1Str(sign);
            if (sign == signature)
            {
                return true;
            }
            else
            {
                return false;
            }

        }

        /// <summary>
        /// SHA1加密方法
        /// </summary>
        /// <param name="str">需要加密的字符串</param>
        /// <returns></returns>
        public string GetSHA1Str(string str)
        {
            byte[] _byte = Encoding.Default.GetBytes(str);
            HashAlgorithm ha = new SHA1CryptoServiceProvider();
            _byte = ha.ComputeHash(_byte);
            StringBuilder sha1Str = new StringBuilder();
            foreach (byte b in _byte)
            {
                sha1Str.AppendFormat("{0:x2}", b);
            }
            return sha1Str.ToString();
        }

推荐文章：https://www.cnblogs.com/HelloMyWorld/p/6380081.html

http://blog.csdn.net/inforstack/article/details/47780275