钉钉自定义机器人加签认证（HmacSHA256）C#实现

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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");

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        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}";