function getAttributes($csr = null)
    {
        if (empty($csr)) {
            $csr = $this->currentCert;
        }

        $attributes = $this->_subArray($csr, 'certificationRequestInfo/attributes');
        $attrs = array();

        if (is_array($attributes)) {
            foreach ($attributes as $attribute) {
                $attrs[] = $attribute['type'];
            }
        }

        return $attrs;
    }