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<?php |
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declare(strict_types = 1); |
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namespace Sop\X509\Certificate\Extension; |
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use Sop\ASN1\Element; |
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use Sop\ASN1\Type\Constructed\Sequence; |
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use Sop\ASN1\Type\Primitive\Boolean; |
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use Sop\ASN1\Type\Primitive\Integer; |
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use Sop\ASN1\Type\UnspecifiedType; |
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/** |
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* Implements 'Basic Constraints' certificate extension. |
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* |
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* @see https://tools.ietf.org/html/rfc5280#section-4.2.1.9 |
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*/ |
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class BasicConstraintsExtension extends Extension |
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{ |
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/** |
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* Whether certificate is a CA. |
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* |
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* @var bool |
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*/ |
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protected $_ca; |
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/** |
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* Maximum certification path length. |
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* |
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* @var null|int |
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*/ |
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protected $_pathLen; |
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/** |
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* Constructor. |
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* |
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* @param bool $critical |
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* @param bool $ca |
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* @param null|int $path_len |
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*/ |
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public function __construct(bool $critical, bool $ca, ?int $path_len = null) |
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{ |
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parent::__construct(self::OID_BASIC_CONSTRAINTS, $critical); |
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$this->_ca = $ca; |
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$this->_pathLen = $path_len; |
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} |
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/** |
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* Whether certificate is a CA. |
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* |
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* @return bool |
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*/ |
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public function isCA(): bool |
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{ |
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return $this->_ca; |
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} |
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/** |
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* Whether path length is present. |
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* |
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* @return bool |
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*/ |
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public function hasPathLen(): bool |
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{ |
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return isset($this->_pathLen); |
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} |
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/** |
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* Get path length. |
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* |
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* @throws \LogicException If not set |
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* |
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* @return int |
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*/ |
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public function pathLen(): int |
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{ |
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if (!$this->hasPathLen()) { |
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throw new \LogicException('pathLenConstraint not set.'); |
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} |
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return $this->_pathLen; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected static function _fromDER(string $data, bool $critical): Extension |
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{ |
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$seq = UnspecifiedType::fromDER($data)->asSequence(); |
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$ca = false; |
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$path_len = null; |
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$idx = 0; |
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if ($seq->has($idx, Element::TYPE_BOOLEAN)) { |
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$ca = $seq->at($idx++)->asBoolean()->value(); |
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} |
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if ($seq->has($idx, Element::TYPE_INTEGER)) { |
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$path_len = $seq->at($idx)->asInteger()->intNumber(); |
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} |
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return new self($critical, $ca, $path_len); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function _valueASN1(): Element |
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{ |
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$elements = []; |
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if ($this->_ca) { |
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$elements[] = new Boolean(true); |
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} |
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if (isset($this->_pathLen)) { |
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$elements[] = new Integer($this->_pathLen); |
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} |
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return new Sequence(...$elements); |
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} |
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} |
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sop /
x509
