/**
* Initialize variables according to RFC 5280 6.1.2.
*
* @link https://tools.ietf.org/html/rfc5280#section-6.1.2
* @param PathValidationConfig $config
* @param Certificate $trust_anchor Trust anchor certificate
* @param int $n Number of certificates in the certification path
* @return self
*/
public static function initialize(PathValidationConfig $config, Certificate $trust_anchor, $n)
{
$state = new self();
$state->_pathLength = $n;
$state->_index = 1;
$state->_validPolicyTree = new PolicyTree(PolicyNode::anyPolicyNode());
$state->_permittedSubtrees = null;
$state->_excludedSubtrees = null;
$state->_explicitPolicy = $config->explicitPolicy() ? 0 : $n + 1;
$state->_inhibitAnyPolicy = $config->anyPolicyInhibit() ? 0 : $n + 1;
$state->_policyMapping = $config->policyMappingInhibit() ? 0 : $n + 1;
$state->_workingPublicKeyAlgorithm = $trust_anchor->signatureAlgorithm();
$tbsCert = $trust_anchor->tbsCertificate();
$state->_workingPublicKey = $tbsCert->subjectPublicKeyInfo();
$state->_workingPublicKeyParameters = self::getAlgorithmParameters($state->_workingPublicKey->algorithmIdentifier());
$state->_workingIssuerName = $tbsCert->issuer();
$state->_maxPathLength = $config->maxLength();
return $state;
}
