protected static bool ValidateToken(AuthenticationToken orginal, AuthenticationToken login)
        {
            if (!orginal.Username.Equals(login.Username)) {
                throw new AuthenticationException("验证证书信息与原有的证书信息不符合,原有:"+orginal.Username+",验证:"+login.Username);
            }

            string salt=orginal.Salt;
            string encryptCredentials= CryptoUtils.MD5Encrypt(login.Credentials);
            return orginal.Credentials.Equals(encryptCredentials);
            
        }
 /// <summary>
 /// 
 /// 登录
 /// </summary>
 /// <param name="orginal">原有的认证TOken,登录的TOken</param>
 /// <param name="login"></param>
 /// <returns></returns>
 public static Subject Login(AuthenticationToken orginal,AuthenticationToken login){
     if (null == login || orginal==null) {
         throw new AuthenticationException("验证TOKEN不能为空!");
     }
     if (ValidateToken(orginal, login))
     {
         CurrentSubjectInstance = Subject.Login(orginal.Id.ToString(), null, null);
         return CurrentSubjectInstance;
     }   
     else {
         //认证失败
         throw new AuthenticationException("鉴定用户证书密码不匹配!");
     }
 }