/**
* Generate ASN.1 structure.
*
* @return Sequence
*/
public function toASN1()
{
$elements = array(new Enumerated($this->_digestedObjectType));
if (isset($this->_otherObjectTypeID)) {
$elements[] = new ObjectIdentifier($this->_otherObjectTypeID);
}
$elements[] = $this->_digestAlgorithm->toASN1();
$elements[] = $this->_objectDigest;
return new Sequence(...$elements);
}
/**
* Get ASN.1 parameters from algorithm identifier.
*
* @param AlgorithmIdentifierType $algo
* @return Element|null ASN.1 element or null if parameters are omitted
*/
public static function getAlgorithmParameters(AlgorithmIdentifierType $algo)
{
$seq = $algo->toASN1();
return $seq->has(1) ? $seq->at(1)->asElement() : null;
}