using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  
  namespace Common
  {
      public class WeChatSecurityHelper
     {
         /// <summary>
         /// 定义Token，与微信公共平台上的Token保持一致
         /// </summary>
         private const string Token = "StupidMe";
         /// <summary>
         /// AppId 要与 微信公共平台 上的 AppId 保持一致
         /// </summary>
         private const string AppId = "11111111111";
         /// <summary>
         /// 加密用 
         /// </summary>
         private const string AESKey = "pvX2KZWRLQSkUAbvArgLSAxCwTtxgFWF3XOnJ9iEUMG";
 
         private static Tencent.WXBizMsgCrypt wxcpt = new Tencent.WXBizMsgCrypt(Token, AESKey, AppId);
         private string signature,timestamp,nonce;
         private static LogHelper logger = new LogHelper(typeof(WeChatSecurityHelper));
 
 
         public WeChatSecurityHelper(string signature, string timestamp, string nonce)
         {
             this.signature = signature;
             this.timestamp = timestamp;
             this.nonce = nonce;
         }
 
         /// <summary>
         /// 加密消息
         /// </summary>
         /// <param name="msg">要加密的消息</param>
         /// <returns>加密后的消息</returns>
         public string EncryptMsg(string msg)
         {
            string encryptMsg="";
             int result = wxcpt.EncryptMsg(msg, timestamp, nonce, ref encryptMsg);
             if (result == 0)
             {
                 return encryptMsg;
             }
             else
             {
                 logger.Error("消息加密失败");
                 return "";
             }
         }
 
         /// <summary>
         /// 解密消息
         /// </summary>
         /// <param name="msg">消息体</param>
         /// <returns>明文消息</returns>
         public string DecryptMsg(string msg)
         {
             string decryptMsg = "";
             int result = wxcpt.DecryptMsg(signature, timestamp, nonce, msg,ref decryptMsg);
             if (result != 0)
             {
                 logger.Error("消息解密失败,result:"+result);
             }
             return decryptMsg;
         }
     }
}