腾讯QQ会员中心g_tk32算法【C#版】

最近用C#写qq活动辅助类程序，碰到了会员签到的gtk算法不一样，后来网上找了看，发现有php版的（https://www.oschina.net/code/snippet_1378052_48831）

后来参考了php版的查php相关的资料用C#写了一个：

 /// <summary>
        /// 计算gtk32值
        /// </summary>
        /// <param name="skey"></param>
        /// <returns></returns>
        public static string GetGTK32(string skey)
        {
            var hash = 5381;
            var md5Key = "tencentQQVIP123443safde&!%^%1282";
            var start = hash << 5;
            var result = string.Empty;
            for (int i = 0; i < skey.Length; i++)
            {
                var ascode = CharToASCII(skey.Substring(i, 1));
                result += (hash << 5) + ascode;
                hash = ascode;
            }
            var str = start + (result + md5Key);
            return GetMD5(str);
        }

        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static string GetMD5(string text)
        {
            StringBuilder sb = new StringBuilder();
            using (MD5 md5 = MD5.Create())
            {
                byte[] md5Byte = md5.ComputeHash(Encoding.Default.GetBytes(text));
                for (int i = 0; i < md5Byte.Length; i++)
                {
                    sb.Append(md5Byte[i].ToString("x2"));
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// /*字符转化为ASCII*/
        /// </summary>
        /// <param name="character"></param>
        /// <returns></returns>
        static int CharToASCII(string character)
        {
            ASCIIEncoding asciiEncoding = new ASCIIEncoding();
            int intAsciiCode = asciiEncoding.GetBytes(character)[0];
            return intAsciiCode;
        }

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