钉钉自定义机器人加签认证（HmacSHA256）C#实现

原文:钉钉自定义机器人加签认证（HmacSHA256）C#实现

0.UTF-8字符集

1.把timestamp+"n"+密钥当做签名字符串，

2.使用HmacSHA256算法计算签名

3.然后进行Base64 encode

4.最后再把签名参数再进行urlEncode，得到最终的签名。

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参数	说明
timestamp	当前时间戳，单位是毫秒，与请求调用时间误差不能超过1小时
secret	密钥，机器人安全设置页面，加签一栏下面显示的SEC开头的字符串

 

签名计算代码示例（Java）

?

123456

Long timestamp = System.currentTimeMillis();String stringToSign = timestamp + "n" + secret;Mac mac = Mac.getInstance("HmacSHA256");mac.init(new SecretKeySpec(secret.getBytes("UTF-8"), "HmacSHA256"));byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));return URLEncoder.encode(new String(Base64.encodeBase64(signData)),"UTF-8");

<br />C#版示例

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12345678910111213141516171819202122232425262728

????????private static byte[] getHmac(string message, string secret)????????{????????????byte[] keyByte = Encoding.UTF8.GetBytes(secret);????????????byte[] messageBytes = Encoding.UTF8.GetBytes(message);????????????using (var hmacsha256 = new HMACSHA256(keyByte))????????????{????????????????byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);????????????????return hashmessage;????????????}????????} ????????public static Int64 ToUTC(this DateTime time)????????{????????????var zts = TimeZoneInfo.Local.BaseUtcOffset;????????????var yc = new DateTime(1970, 1, 1).Add(zts);????????????return (long)(DateTime.Now - yc).TotalMilliseconds;????????}  main.cs ????????????var secret = "123";????????????var timeStamp = DateTime.Now.ToUTC();????????????var stringToSign = $"{timeStamp}n{secret}";????????????var b64 = getHmac(stringToSign, secret);????????????var b64Str = Convert.ToBase64String(b64);????????????var sign = HttpUtility.UrlEncode(b64Str);????????????url = $"{url}&timestamp={timeStamp}&sign={sign}";

　　ok!

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