/**
*
* @param UnspecifiedType $params
* @throws \UnexpectedValueException If parameters are invalid
* @return self
*/
protected static function _fromASN1Params(UnspecifiedType $params = null)
{
if (!isset($params)) {
throw new \UnexpectedValueException("No parameters.");
}
$iv = $params->asOctetString()->string();
return new static($iv);
}
/**
*
* @param UnspecifiedType $el
* @return self
*/
public static function fromChosenASN1(UnspecifiedType $el)
{
$octets = $el->asOctetString()->string();
switch (strlen($octets)) {
case 4:
case 8:
return IPv4Address::fromOctets($octets);
case 16:
case 32:
return IPv6Address::fromOctets($octets);
default:
throw new \UnexpectedValueException("Invalid octet length for IP address.");
}
}
protected static function _fromASN1Params(UnspecifiedType $params = null)
{
if (!isset($params)) {
throw new \UnexpectedValueException("No parameters.");
}
$key_bits = 32;
// rfc2268 a choice containing only IV
if ($params->isType(Element::TYPE_OCTET_STRING)) {
$iv = $params->asOctetString()->string();
} else {
$seq = $params->asSequence();
$idx = 0;
// version is optional in rfc2898
if ($seq->has($idx, Element::TYPE_INTEGER)) {
$version = $seq->at($idx++)->asInteger()->number();
$key_bits = self::_versionToEKB($version);
}
// IV is present in all variants
$iv = $seq->at($idx)->asOctetString()->string();
}
return new self($key_bits, $iv);
}
