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<?php |
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declare(strict_types = 1); |
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namespace X509\Certificate\Extension; |
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use ASN1\Type\UnspecifiedType; |
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use ASN1\Type\Primitive\BitString; |
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use ASN1\Util\Flags; |
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/** |
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* Implements 'Key Usage' certificate extension. |
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* |
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* @link https://tools.ietf.org/html/rfc5280#section-4.2.1.3 |
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*/ |
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class KeyUsageExtension extends Extension |
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{ |
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const DIGITAL_SIGNATURE = 0x100; |
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const NON_REPUDIATION = 0x080; |
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const KEY_ENCIPHERMENT = 0x040; |
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const DATA_ENCIPHERMENT = 0x020; |
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const KEY_AGREEMENT = 0x010; |
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const KEY_CERT_SIGN = 0x008; |
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const CRL_SIGN = 0x004; |
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const ENCIPHER_ONLY = 0x002; |
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const DECIPHER_ONLY = 0x001; |
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/** |
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* Key usage flags. |
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* |
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* @var int $_keyUsage |
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*/ |
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protected $_keyUsage; |
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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 int $keyUsage |
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*/ |
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public function __construct(bool $critical, int $keyUsage) |
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{ |
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parent::__construct(self::OID_KEY_USAGE, $critical); |
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$this->_keyUsage = $keyUsage; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @return self |
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*/ |
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protected static function _fromDER(string $data, bool $critical): self |
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{ |
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return new self($critical, |
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Flags::fromBitString(UnspecifiedType::fromDER($data)->asBitString(), |
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9)->intNumber()); |
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} |
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/** |
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* Check whether digitalSignature flag is set. |
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* |
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* @return bool |
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*/ |
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public function isDigitalSignature(): bool |
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{ |
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return $this->_flagSet(self::DIGITAL_SIGNATURE); |
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} |
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/** |
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* Check whether nonRepudiation/contentCommitment flag is set. |
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* |
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* @return bool |
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*/ |
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public function isNonRepudiation(): bool |
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{ |
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return $this->_flagSet(self::NON_REPUDIATION); |
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} |
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/** |
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* Check whether keyEncipherment flag is set. |
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* |
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* @return bool |
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*/ |
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public function isKeyEncipherment(): bool |
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{ |
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return $this->_flagSet(self::KEY_ENCIPHERMENT); |
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} |
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/** |
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* Check whether dataEncipherment flag is set. |
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* |
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* @return bool |
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*/ |
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public function isDataEncipherment(): bool |
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{ |
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return $this->_flagSet(self::DATA_ENCIPHERMENT); |
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} |
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/** |
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* Check whether keyAgreement flag is set. |
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* |
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* @return bool |
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*/ |
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public function isKeyAgreement(): bool |
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{ |
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return $this->_flagSet(self::KEY_AGREEMENT); |
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} |
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/** |
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* Check whether keyCertSign flag is set. |
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* |
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* @return bool |
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*/ |
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public function isKeyCertSign(): bool |
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{ |
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return $this->_flagSet(self::KEY_CERT_SIGN); |
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} |
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/** |
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* Check whether cRLSign flag is set. |
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* |
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* @return bool |
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*/ |
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public function isCRLSign(): bool |
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{ |
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return $this->_flagSet(self::CRL_SIGN); |
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} |
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/** |
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* Check whether encipherOnly flag is set. |
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* |
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* @return bool |
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*/ |
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public function isEncipherOnly(): bool |
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{ |
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return $this->_flagSet(self::ENCIPHER_ONLY); |
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} |
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/** |
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* Check whether decipherOnly flag is set. |
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* |
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* @return bool |
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*/ |
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public function isDecipherOnly(): bool |
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{ |
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return $this->_flagSet(self::DECIPHER_ONLY); |
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} |
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/** |
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* Check whether given flag is set. |
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* |
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* @param int $flag |
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* @return boolean |
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*/ |
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protected function _flagSet(int $flag): bool |
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{ |
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return (bool) ($this->_keyUsage & $flag); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @return BitString |
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*/ |
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protected function _valueASN1(): BitString |
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{ |
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$flags = new Flags($this->_keyUsage, 9); |
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return $flags->bitString()->withoutTrailingZeroes(); |
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} |
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} |
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et-nik /
x509
