代码修改后的版本，全部提交

TencentCloud/Common/Sign.cs

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+/*
+ * Copyright (c) 2018 THL A29 Limited, a Tencent company. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using TencentCloud.Common.Profile;
+
+namespace TencentCloud.Common
+{
+    /// <summary>
+    /// Signature helper class.
+    /// </summary>
+    public class SignHelper
+    {
+        ///<summary>Generate signature.</summary>
+        ///<param name="signKey">Credential SecretKey.</param>
+        ///<param name="secret">Plain text to be signed.</param>
+        ///<returns>Signature.</returns>
+        public static string Sign(string signKey, string secret, string SignatureMethod)
+        {
+            string signRet = string.Empty;
+            if (SignatureMethod == ClientProfile.SIGN_SHA256)
+            {
+                using (HMACSHA256 mac = new HMACSHA256(Encoding.UTF8.GetBytes(signKey)))
+                {
+                    byte[] hash = mac.ComputeHash(Encoding.UTF8.GetBytes(secret));
+                    signRet = Convert.ToBase64String(hash);
+                }
+            }
+            else if(SignatureMethod == ClientProfile.SIGN_SHA1)
+            {
+                using (HMACSHA1 mac = new HMACSHA1(Encoding.UTF8.GetBytes(signKey)))
+                {
+                    byte[] hash = mac.ComputeHash(Encoding.UTF8.GetBytes(secret));
+                    signRet = Convert.ToBase64String(hash);
+                }
+            }
+            return signRet;
+        }
+
+        public static string SHA256Hex(string s)
+        {
+            using (SHA256 algo = SHA256.Create())
+            {
+                byte[] hashbytes = algo.ComputeHash(Encoding.UTF8.GetBytes(s));
+                StringBuilder builder = new StringBuilder();
+                for ( int i = 0; i < hashbytes.Length; ++i )
+                {
+                    builder.Append(hashbytes[i].ToString("x2"));
+                }
+                return builder.ToString();
+            }
+        }
+
+        public static byte [] HmacSHA256(byte [] key, byte [] msg)
+        {
+            using (HMACSHA256 mac = new HMACSHA256(key))
+            {
+                return mac.ComputeHash(msg);
+            }
+        }
+
+        private static string BuildParamStr(SortedDictionary<string, string> requestParams, string requestMethod = "GET")
+        {
+            string retStr = "";
+            foreach (string key in requestParams.Keys)
+            {
+                retStr += string.Format("{0}={1}&", key, requestParams[key]);
+            }
+            return retStr.TrimEnd('&');
+        }
+
+        public static string MakeSignPlainText(SortedDictionary<string, string> requestParams, string requestMethod , string requestHost, string requestPath)
+        {
+            string retStr = "";
+            retStr += requestMethod;
+            retStr += requestHost;
+            retStr += requestPath;
+            retStr += "?";
+            retStr += BuildParamStr(requestParams);
+            return retStr;
+        }
+    }
+}