这方面的文章已经有很多了，我只是记录一下自己在项目中应用的具体实现

客户端

1  DateTime t = DateTime.Now;2             long timeStamp = SignHelper.ConvertDateTimeInt(t);3             var param = new SortedDictionary
     
      ();4             param.Add("id=", id);5             param.Add("timeStamp=", timeStamp.ToString());6             string pwdKey = "***";7             var sign = SignHelper.GetSign(param, pwdKey);8             TempData["path"] = "Authorize?id=" + id + "&sign="+sign + "&timeStamp="+timeStamp;9             return View();
     

服务端

DateTime requestTime =                 SignHelper.GetDateTimeByTicks(timeStamp.ToString());            if (requestTime.AddMinutes(20) < DateTime.Now)            {                TempData["msg"] = "请求超时";                return View("../Home/Error");            }            var param = new SortedDictionary
     
      ();            param.Add("id=", id);            param.Add("timeStamp=", timeStamp.ToString());            string pwdKey = "****";            var _sign = SignHelper.GetSign(param, pwdKey);            if (sign != _sign)            {                TempData["msg"] = "非法登录";                return View("../Home/Error");            }            SysUserEntity userEntity = new SysUserEntity();            try            {                userEntity = new UserApp().CheckUser(id);            }            catch (Exception ex)            {                TempData["msg"]  = ex.Message;                return View("../Home/Error");            }
     

　　SignHelper 类：

1  public class SignHelper 2     { 3         public static string GetSign(SortedDictionary
     
       paramList, string appKey) 4         { 5             paramList.Remove("_sign"); 6             StringBuilder sb = new StringBuilder(); 7             foreach (var p in paramList) 8                 sb.Append(p.Key).Append(p.Value); 9             sb.Append(appKey);10             return GetMD5(sb.ToString());11         }12         public static string GetMD5(string str)13         {14             if (string.IsNullOrEmpty(str))15                 return str;16             var sb = new StringBuilder(32);17             var md5 = System.Security.Cryptography.MD5.Create();18             var output = md5.ComputeHash(Encoding.UTF8.GetBytes(str));19             for (int i = 0; i < output.Length; i++)20                 sb.Append(output[i].ToString("x").PadLeft(2, '0'));21             return sb.ToString();22         }23 24         public static DateTime GetDateTimeByTicks(string timeStamp)25         {26             DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));27             long lTime = long.Parse(timeStamp + "0000");28             TimeSpan toNow = new TimeSpan(lTime);29             return dtStart.Add(toNow);30         }31 32         public static int ConvertDateTimeInt(DateTime time)33         {34             System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));35             return (int)(time - startTime).TotalSeconds;36         }37 38 39     }
     

md5 类：

1 /// 
 2     /// MD5加密 3     /// 
 4     public class Md5 5     { 6         /// 
 7         /// MD5加密 8         /// 
 9         /// 加密字符10         /// 加密位数16/3211         /// 
     12         public static string md5(string str, int code)13         {14             string strEncrypt = string.Empty;15             if (code == 16)16             {17                 strEncrypt = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").Substring(8, 16);18             }19 20             if (code == 32)21             {22                 strEncrypt = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");23             }24 25             return strEncrypt;26         }27 28         public static string GetMD5(string str)29         {30             if (string.IsNullOrEmpty(str))31                 return str;32             var sb = new StringBuilder(32);33             var md5 = System.Security.Cryptography.MD5.Create();34             var output = md5.ComputeHash(Encoding.UTF8.GetBytes(str));35             for (int i = 0; i < output.Length; i++)36                 sb.Append(output[i].ToString("X").PadLeft(2, '0'));37             return sb.ToString();38         }39     }