public static string Encrypt(string key)
{
string timespan = TimeConvert.GetCurrentUTCTimeSpan();
string mixedKey = $"{timespan}&{key}&{_desKey}";
return(DESProvider.Encrypt(mixedKey, _desKey));
}
public static bool KeyIsAvailable(string key)
{
try
{
var mixedKey = DESProvider.Decrypt(key, _desKey);
var parameters = mixedKey.Split('&');
var keyTime = TimeConvert.TimeSpanToUTCDateTime(parameters[0]);
if ((DateTime.UtcNow - keyTime) > _expireTime || parameters[1] != _pcsKey || parameters[2] != _desKey)
{
return(false);
}
return(true);
}
catch
{
return(false);
}
}