public static function hash($input)
    {
        if (Symphony::Log()) {
            Symphony::Log()->pushDeprecateWarningToLog('SHA1::hash()', 'PBKDF2::hash()', array(
                'message-format' => __('The use of `%s` is strongly discouraged due to severe security flaws.'),
            ));
        }
        return sha1($input);
    }