C# Http Post请求接口 Des加密接口

        private static string key = "VSQAdmin";//密文 加密解密是都需要密文且保持一致

        private static string iv = "VSQAdmin";//加密解密时key 、 iv 中传入的key、iv值一致

        /// <summary>
        /// 请求方法
        /// </summary>
        /// <param name="info"></param>
        /// <returns></returns>
        public static string Route(ChangpaostartendRequestModel info)
        {
            try
            {
                string host = string.Empty;
                host = string.Format("{0}", "接口地址");
                string errorMessage = string.Empty;
                if (info == null)
                {
                    errorMessage = "请求参数错误！";
                }
                info.appId = "C0BE88DC14F99A694F7A2AAF971B7C6092B5DDBA69ECFA13";

                string dataJson = JsonConvert.SerializeObject(info, null, new Newtonsoft.Json.JsonSerializerSettings());
                string datainfo = Des(dataJson);


                ServicePointManager.ServerCertificateValidationCallback = (RemoteCertificateValidationCallback)Delegate.Combine(ServicePointManager.ServerCertificateValidationCallback, new RemoteCertificateValidationCallback(ValidateServerCertificate));
                ServicePointManager.Expect100Continue = false;
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
                
                
                Encoding encoding = Encoding.UTF8;
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
                request.Method = WebRequestMethods.Http.Post;
                request.ContentType = "application/json;charset=utf-8";

                byte[] buffer = encoding.GetBytes(datainfo);
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

                string result = reader.ReadToEnd();

                string testbase = DecryptString(result);

                return testbase;
            }
            catch (Exception e)
            {
                ExceptionService.Current.Handle(e);
                return string.Format("Error:{0}！", e.Message);
            }

        }



        /// <summary>
        /// Des解密
        /// </summary>
        /// <param name="pToDecrypt"></param>
        /// <returns></returns>
        public  static string DecryptString(string pToDecrypt)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = UTF8Encoding.UTF8.GetBytes(key);//***************key与加密时的Key保持一致
            des.IV = UTF8Encoding.UTF8.GetBytes(iv);//*****************skey与加密时的IV保持一致

            MemoryStream ms = new MemoryStream();

            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            return Encoding.UTF8.GetString(ms.ToArray());
        }
        /// <summary>
        /// Des加密
        /// </summary>
        /// <param name="encryptString"></param>
        /// <returns></returns>
        public static string Des(string encryptString)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] sor = Encoding.UTF8.GetBytes(encryptString);
            //传入key、iv
            des.Key = UTF8Encoding.UTF8.GetBytes(key);
            des.IV = UTF8Encoding.UTF8.GetBytes(iv);

            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(sor, 0, sor.Length);
            cs.FlushFinalBlock();

            StringBuilder sb = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                sb.AppendFormat("{0:X2}", b);
            }
            return sb.ToString();
        }



        private static bool ValidateServerCertificate(object sender, System.Security.Cryptography.X509Certificates.X509Certificate cert, X509Chain chain, SslPolicyErrors error)
        {
            //为了通过证书验证，总是返回true  
            return true;
        }