C#代码实现A鉴权的方法

using System;
using System.IO;
using System.Security.Cryptography;
namespace createAuthKey
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            String key = "888888";
            String domain = "http://osscdn.pier39.cn";
            String urlPath = "/test.html";
            String timeStamp = UnixTimeStamp(30);
            String auth_md5 = GetMd5(urlPath + "-" + timeStamp + "-0-0-" + key);
            String auth_key = timeStamp + "-0-0-" + auth_md5;
            String url = domain + urlPath + "?auth_key=" + auth_key;
            Console.WriteLine(url);
                
        }
        public static String UnixTimeStamp(long time){
            double seconds = (DateTime.Now.AddMinutes(time) - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1))).TotalSeconds;
            return seconds.ToString("#");
        }
        public static String GetMd5(String msg){
            String str = "";
            byte[] data = System.Text.Encoding.GetEncoding("utf-8").GetBytes(msg);
            MD5 mD5 = new MD5CryptoServiceProvider();
            byte[] bytes = mD5.ComputeHash(data);
            for (int i = 0; i < bytes.Length;i++){
                str += bytes[i].ToString("x2");
            }
            return str;
        }
    }
}