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<?php
declare(strict_types=1);
namespace SpomkyLabs\Pki\ASN1;
use BadMethodCallException;
use SpomkyLabs\Pki\ASN1\Component\Identifier;
use SpomkyLabs\Pki\ASN1\Component\Length;
use SpomkyLabs\Pki\ASN1\Feature\ElementBase;
use function mb_strlen;
/**
* Container for raw DER encoded data.
*
* May be inserted into structure without decoding first.
* @see \SpomkyLabs\Pki\Test\ASN1\DERDataTest
*/
final class DERData extends Element
{
/**
* DER encoded data.
*/
private readonly string $der;
/**
* Identifier of the underlying type.
*/
private readonly Identifier $identifier;
/**
* Offset to the content in DER data.
*/
private int $contentOffset = 0;
/**
* @param string $data DER encoded data
*/
private function __construct(string $data)
{
$this->identifier = Identifier::fromDER($data, $this->contentOffset);
// check that length encoding is valid
Length::expectFromDER($data, $this->contentOffset);
$this->der = $data;
parent::__construct($this->identifier->intTag());
}
public static function create(string $data): self
{
return new self($data);
}
public function typeClass(): int
{
return $this->identifier->typeClass();
}
public function isConstructed(): bool
{
return $this->identifier->isConstructed();
}
public function toDER(): string
{
return $this->der;
}
protected function encodedAsDER(): string
{
// if there's no content payload
if (mb_strlen($this->der, '8bit') === $this->contentOffset) {
return '';
}
return mb_substr($this->der, $this->contentOffset, null, '8bit');
}
protected static function decodeFromDER(Identifier $identifier, string $data, int &$offset): ElementBase
{
throw new BadMethodCallException(__METHOD__ . ' must be implemented in derived class.');
}
}
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