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<?php declare(strict_types=1); namespace SpomkyLabs\Pki\X509\AttributeCertificate; use SpomkyLabs\Pki\ASN1\Type\Constructed\Sequence; use SpomkyLabs\Pki\ASN1\Type\UnspecifiedType; use SpomkyLabs\Pki\CryptoBridge\Crypto; use SpomkyLabs\Pki\CryptoEncoding\PEM; use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier; use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\Feature\SignatureAlgorithmIdentifier; use SpomkyLabs\Pki\CryptoTypes\Asymmetric\PublicKeyInfo; use SpomkyLabs\Pki\CryptoTypes\Signature\Signature; use SpomkyLabs\Pki\X509\Certificate\Certificate; use Stringable; use UnexpectedValueException; /** * Implements *AttributeCertificate* ASN.1 type. * * @see https://tools.ietf.org/html/rfc5755#section-4.1 */ final class AttributeCertificate implements Stringable { private function __construct( private readonly AttributeCertificateInfo $acInfo, private readonly SignatureAlgorithmIdentifier $signatureAlgorithm, private readonly Signature $signatureValue ) { } /** * Get attribute certificate as a PEM formatted string. */ public function __toString(): string { return $this->toPEM() ->string(); } public static function create( AttributeCertificateInfo $acInfo, SignatureAlgorithmIdentifier $signatureAlgorithm, Signature $signatureValue ): self { return new self($acInfo, $signatureAlgorithm, $signatureValue); } /** * Initialize from ASN.1. */ public static function fromASN1(Sequence $seq): self { $acinfo = AttributeCertificateInfo::fromASN1($seq->at(0)->asSequence()); $algo = AlgorithmIdentifier::fromASN1($seq->at(1)->asSequence()); if (! $algo instanceof SignatureAlgorithmIdentifier) { throw new UnexpectedValueException('Unsupported signature algorithm ' . $algo->oid() . '.'); } $signature = Signature::fromSignatureData($seq->at(2)->asBitString()->string(), $algo); return self::create($acinfo, $algo, $signature); } /** * Initialize from DER data. */ public static function fromDER(string $data): self { return self::fromASN1(UnspecifiedType::fromDER($data)->asSequence()); } /** * Initialize from PEM. */ public static function fromPEM(PEM $pem): self { if ($pem->type() !== PEM::TYPE_ATTRIBUTE_CERTIFICATE) { throw new UnexpectedValueException('Invalid PEM type.'); } return self::fromDER($pem->data()); } /** * Get attribute certificate info. */ public function acinfo(): AttributeCertificateInfo { return $this->acInfo; } /** * Get signature algorithm identifier. */ public function signatureAlgorithm(): SignatureAlgorithmIdentifier { return $this->signatureAlgorithm; } /** * Get signature value. */ public function signatureValue(): Signature { return $this->signatureValue; } /** * Get ASN.1 structure. */ public function toASN1(): Sequence { return Sequence::create( $this->acInfo->toASN1(), $this->signatureAlgorithm->toASN1(), $this->signatureValue->bitString() ); } /** * Get attribute certificate as a DER. */ public function toDER(): string { return $this->toASN1() ->toDER(); } /** * Get attribute certificate as a PEM. */ public function toPEM(): PEM { return PEM::create(PEM::TYPE_ATTRIBUTE_CERTIFICATE, $this->toDER()); } /** * Check whether attribute certificate is issued to the subject identified by given public key certificate. * * @param Certificate $cert Certificate */ public function isHeldBy(Certificate $cert): bool { if (! $this->acInfo->holder()->identifiesPKC($cert)) { return false; } return true; } /** * Check whether attribute certificate is issued by given public key certificate. * * @param Certificate $cert Certificate */ public function isIssuedBy(Certificate $cert): bool { if (! $this->acInfo->issuer()->identifiesPKC($cert)) { return false; } return true; } /** * Verify signature. * * @param PublicKeyInfo $pubkey_info Signer's public key * @param null|Crypto $crypto Crypto engine, use default if not set */ public function verify(PublicKeyInfo $pubkey_info, ?Crypto $crypto = null): bool { $crypto ??= Crypto::getDefault(); $data = $this->acInfo->toASN1() ->toDER(); return $crypto->verify($data, $this->signatureValue, $pubkey_info, $this->signatureAlgorithm); } }
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