Sing的签名算法

在一个项目上，要用到签名算法，接口是这样写的：

5.1.1.  输入参数为
method= openapi.stockout.create
timestamp=2015-04-26 00:00:07
format=xml
app_key= testerp_appkey
v=2.0
sign_method=md5
customerId =test
5.1.2.  按首字母升序排列
app_key= testerp_appkey
customerId = stub-cust-code
format=xml
method= openapi.stockout.create
sign_method=md5
timestamp=2015-04-26 00:00:07
v=2.0
5.1.3.  连接字符串
连接参数名与参数值,并在首尾加上 secret，此处假设 secret=test，如下：
testapp_keytesterp_appkeycustomerIdstub-cust-codeformatxmlmethod
openapi.stockout.createsign_methodmd5timestamp2015-04-26 00:00:07v2.0 body test
其中： body 用请求中的 body 数据代替
5.1.4.  生成签名 sign
32 位大写 MD5 值-> D06D88CB34B2EC0E5C9BAB396C9542B6
5.1.5.  拼装 URL 请求
将所有参数值转换为 UTF-8 编码，然后拼装，并作 URL ENCODING 如下:
http://sandbox.vwms.cn/open/service?method=
opeanapi.stockout.create&timestamp=2015-04-
26%2000:00:07&format=xml&app_key=testerp_appkey&v=2.0&sign=D06D88CB34B2EC0E5C9B
AB396C9542B6&sign_method=md5&customerId=stub-cust-code

做法是这样的：

 //timestamp
                    string timestamp = DateTime.Now.ToString();
                    JObject o = new JObject(
                         new JProperty("app_key", _Setting.Value.app_key.ToString()),
                         new JProperty("customerId", _Setting.Value.customerId.ToString()),
                         new JProperty("format", "xml"),
                         new JProperty("method", "openapi.singleitem.synchronize"),
                         new JProperty("sign_method", "md5"),
                         new JProperty("timestamp", timestamp),
                         new JProperty("v", "2.0")
                        );

                    //先把上面的进行排序
                    string s = JsonConvert.SerializeObject(o);
                    Dictionary<string, string> values = JsonConvert.DeserializeObject<Dictionary<string, string>>(s);
                    string Sort_Ret = CommonData.GetSignature(values, "");
                    //拼接URL链接
                    string secret = _Setting.Value.secret;
                    string Sign = CommonData.StrToMD5(secret + Sort_Ret + in0 + secret);
                    string url = "" + _Setting.Value.UrlApi.ToString() + "?" +
                     "method=" + "openapi.singleitem.synchronize" +
                     "&timestamp=" + timestamp + "" +
                     "&format=xml" +
                     "&app_key=" + _Setting.Value.app_key.ToString() + "" +
                     "&v=2.0" +
                     "&sign=" + Sign + "" +
                     "&sign_method=md5" +
                     "&customerId=" + _Setting.Value.customerId.ToString() + "";
                    //发送Http 请求
                    HttpClient client = httpClientFactory.CreateClient();
                    HttpContent content = new StringContent(in0, Encoding.UTF8, "application/json");//将所有制进行utf-8的编码
                    var ret = await client.PostAsync(url, content);
                    var rr = await ret.Content.ReadAsStringAsync();

涉及到的方法，一个是排序，一个是得到Sign的值

 public static string GetSignature(IDictionary<string, string> parameters, string secret)
        {
            // 先将参数以其参数名的字典序升序进行排序
            IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(parameters);
            IEnumerator<KeyValuePair<string, string>> iterator = sortedParams.GetEnumerator();

            // 遍历排序后的字典，将所有参数按"keyvaluekeyvalue"格式拼接在一起
            StringBuilder basestring = new StringBuilder();
            while (iterator.MoveNext())
            {
                string key = iterator.Current.Key;
                string value = iterator.Current.Value.ToString();
                if (!string.IsNullOrEmpty(key) && value != null)
                {
                    basestring.Append(key).Append(value);
                }
            }

            // 使用MD5对待签名串求签
            //string upperCaseStr = StrToMD5(basestring.ToString());
            //string result = StrToMD5(upperCaseStr + secret);
            return basestring.ToString();
        }

        public static string StrToMD5(string str)
        {
            byte[] data = Encoding.UTF8.GetBytes(str);
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] OutBytes = md5.ComputeHash(data);

            string OutString = "";
            for (int i = 0; i < OutBytes.Length; i++)
            {
                OutString += OutBytes[i].ToString("x2");
            }
            return OutString.ToUpper();
        }

        public static DateTime GetLocaltime(string StandardTime)
        {
            var ChTimeZone = TimeZoneInfo.FindSystemTimeZoneById(StandardTime);
            DateTime ChTime = TimeZoneInfo.ConvertTime(DateTime.Now, TimeZoneInfo.Local, ChTimeZone);
           
            return ChTime;
        }