protected function setEntries(FirewallInterface $firewall, $config)
    {
        $entries = (isset($config['entries']) ? $config['entries'] : array());

        $blackEntries = array_keys($entries, false);
        $whiteEntries = array_keys($entries, true);

        if (count($blackEntries)) {
            $firewall->addList($blackEntries, 'blackedOptions', false);
        }

        if (count($whiteEntries)) {
            $firewall->addList($whiteEntries, 'whitedOptions', true);
        }

        return $this;
    }