static long First(long cardPublicKey, long doorPublicKey)
{
var lockSystem = new LockSystem()
{
CardPublicKey = cardPublicKey, DoorPublicKey = doorPublicKey
};
lockSystem.ReverseCardLoopSize();
lockSystem.ReverseDoorLoopSize();
lockSystem.ReverseEncryptionKey();
return(lockSystem.EncryptionKey);
}