带"签名"的请求接口实现

废话少说，直接上代码(⊙﹏⊙)

 class Program
    {
        //签名证书
        public static X509Certificate2 cerSigneCert;
        private static char[] hexChars;
        public Program()
        {
            cerSigneCert = new X509Certificate2(AppDomain.CurrentDomain.BaseDirectory + @"resources\20016100001118204.p12", "");
        }
        static void Main(string[] args)
        {
            string xml = "xml字符串 <SIGNED_MSG />";
            string newXML = SHA1withRSA(xml);
            string url = "访问地址";
            string requestUrl = RequestUrl(url, newXML);

        }

        /// <summary>
        /// 签名
        /// PS:（SIGNED_MSG是属性的名称）
        /// </summary>
        /// <param name="xml"></param>
        /// <returns></returns>
        private static string SHA1withRSA(string xml)
        {
            string oldXML = xml.Replace("<SIGNED_MSG />", "");
            SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();
            byte[] msg = sha1.ComputeHash(Encoding.GetEncoding("GBK").GetBytes(oldXML));

            RSAPKCS1SignatureFormatter signe = new RSAPKCS1SignatureFormatter();

            signe.SetKey(cerSigneCert.PrivateKey);//设置用于签名的私钥
            signe.SetHashAlgorithm("SHA1");
            var signeText = ToHex(signe.CreateSignature(msg));//创建签名

            string newXML = xml.Replace("<SIGNED_MSG />", "<SIGNED_MSG>" + signeText + "</SIGNED_MSG>");
            return newXML;
        }

        private static string ToHex(byte[] ba)
        {
            if (ba == null) return "";
            char[]
                buf = new char[ba.Length * ];

            int p = ;
            foreach (byte b in ba)
            {
                buf[p++] = hexChars[b >> ];
                buf[p++] = hexChars[b & 0x0f];
            }
            return new string(buf);
        }

        /// <summary>
        /// 发送请求,获取响应
        /// </summary>
        /// <param name="url"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string RequestUrl(string url, string data)//发送方法
        {
            var request = WebRequest.Create(url) as HttpWebRequest;

            request.ProtocolVersion = HttpVersion.Version11;
            // 这里设置了协议类型。
            request.KeepAlive = false;

            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(RemoteCertificateValidate);
            ServicePointManager.CheckCertificateRevocationList = true;
            ServicePointManager.DefaultConnectionLimit = ;
            ServicePointManager.Expect100Continue = false;

            request.Method = "post";
            request.ContentType = "text/xml";
            request.Headers.Add("charset:gbk");
            var encoding = Encoding.GetEncoding("GBK");

            if (data != null)
            {
                byte[] buffer = encoding.GetBytes(data);
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, , buffer.Length);
            }
            else
            {

            }

            using (HttpWebResponse wr = request.GetResponse() as HttpWebResponse)
            {
                using (StreamReader reader = new StreamReader(wr.GetResponseStream(), encoding))
                {
                    string strResult = reader.ReadToEnd();
                    return strResult;
                }
            }
        }

        private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
        {
            System.Console.WriteLine("Warning, trust any certificate");
            //为了通过证书验证，总是返回true
            return true;
        }

    }

有关XML转换，大家请参考上一篇文章： https://www.cnblogs.com/shuai7boy/p/10963734.html