ASP.NET C# 实现钉钉签名算法

在 https://open-doc.dingtalk.com/microapp/faquestions/hxs5v9 钉钉给出了JAVA/PHP算法，下面是C#算法

 using System.Security.Cryptography
using System.Text;
 private string hash_hmac2(string message, string secret)
        {
            secret = secret ?? "";
            var encoding = new System.Text.ASCIIEncoding();
            byte[] keyByte = encoding.GetBytes(secret);
            byte[] messageBytes = encoding.GetBytes(message);
            using (var hmacsha256 = new HMACSHA256(keyByte))
            {
                byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
                return Convert.ToBase64String(hashmessage);
            }
        }

下面是调用代码：

           login  timespan=1546084445901;
           string appsec = "testappSecret";

           sign= hash_hmac2(timespan.ToString(),appsec);
        
           //此时sign为   HCbG3xNE3vzhO+u7qCUL1jS5hsu2n5r2cFhnTrtyDAE=
 
           Response.Write(sign);

下面是获取时间戳

  public long GetTimeStamp()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds);
        }