sop / x509

		$this->_authInfo = $auth_info;

	}

	public static function fromASN1(UnspecifiedType $el) {

		$seq = $el->asSequence();

		$service = GeneralName::fromASN1($seq->at(0)->asTagged());

		$ident = GeneralName::fromASN1($seq->at(1)->asTagged());

		$auth_info = null;

		if ($seq->has(2, Element::TYPE_OCTET_STRING)) {

			$auth_info = $seq->at(2)

				->asString()

				->string();

		}

		return new static($service, $ident, $auth_info);

	}

	/**

	 * Get service name.

	 * @param Sequence $seq

	 * @return self

	 */

	public static function fromASN1(Sequence $seq) {

		$issuer = GeneralNames::fromASN1($seq->at(0)->asSequence());

		$serial = $seq->at(1)

			->asInteger()

			->number();

		$uid = null;

		if ($seq->has(2, Element::TYPE_BIT_STRING)) {

			$uid = UniqueIdentifier::fromASN1($seq->at(2)->asBitString());

		}

		return new self($issuer, $serial, $uid);

	}

	/**

	 * Initialize from a public key certificate.