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<?php |
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declare(strict_types = 1); |
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namespace Sop\PKCS5\ASN1\AlgorithmIdentifier; |
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use Sop\ASN1\Element; |
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use Sop\ASN1\Type\Constructed\Sequence; |
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use Sop\ASN1\Type\UnspecifiedType; |
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use Sop\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier; |
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use Sop\CryptoTypes\AlgorithmIdentifier\Cipher\BlockCipherAlgorithmIdentifier; |
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use Sop\CryptoTypes\AlgorithmIdentifier\SpecificAlgorithmIdentifier; |
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/* |
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From RFC 2898 - A.4 PBES2: |
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The parameters field associated with this OID in an |
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AlgorithmIdentifier shall have type PBES2-params: |
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PBES2-params ::= SEQUENCE { |
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keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}}, |
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encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} } |
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*/ |
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/** |
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* Algorithm identifier for PBES2 encryption scheme. |
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* |
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* @see https://tools.ietf.org/html/rfc2898#section-6.2 |
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* @see https://tools.ietf.org/html/rfc2898#appendix-A.4 |
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*/ |
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class PBES2AlgorithmIdentifier extends PBEAlgorithmIdentifier |
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{ |
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/** |
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* PBKDF2 algorithm identifier. |
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* |
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* @var PBKDF2AlgorithmIdentifier |
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*/ |
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protected $_kdf; |
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/** |
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* Encryption algorithm identifier. |
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* |
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* @var BlockCipherAlgorithmIdentifier |
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*/ |
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protected $_es; |
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/** |
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* Constructor. |
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* |
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* @param PBKDF2AlgorithmIdentifier $kdf |
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* @param BlockCipherAlgorithmIdentifier $es |
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*/ |
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public function __construct(PBKDF2AlgorithmIdentifier $kdf, |
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BlockCipherAlgorithmIdentifier $es) |
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{ |
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parent::__construct($kdf->salt(), $kdf->iterationCount()); |
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$this->_oid = self::OID_PBES2; |
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$this->_kdf = $kdf; |
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$this->_es = $es; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function name(): string |
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{ |
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return 'pkcs5PBES2'; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return self |
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*/ |
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public static function fromASN1Params( |
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?UnspecifiedType $params = null): SpecificAlgorithmIdentifier |
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{ |
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if (!isset($params)) { |
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throw new \UnexpectedValueException('No parameters.'); |
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} |
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$seq = $params->asSequence(); |
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$kdf = PBKDF2AlgorithmIdentifier::fromASN1($seq->at(0)->asSequence()); |
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// ensure we got proper key derivation function algorithm |
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if (!($kdf instanceof PBKDF2AlgorithmIdentifier)) { |
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throw new \UnexpectedValueException( |
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'KDF algorithm ' . $kdf->oid() . ' not supported.'); |
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} |
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$es = AlgorithmIdentifier::fromASN1($seq->at(1)->asSequence()); |
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// ensure we got proper encryption algorithm |
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if (!($es instanceof BlockCipherAlgorithmIdentifier)) { |
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throw new \UnexpectedValueException( |
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'ES algorithm ' . $es->oid() . ' not supported.'); |
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} |
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return new self($kdf, $es); |
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} |
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/** |
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* Get key derivation function algorithm identifier. |
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* |
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* @return PBKDF2AlgorithmIdentifier |
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*/ |
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public function kdfAlgorithmIdentifier(): PBKDF2AlgorithmIdentifier |
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{ |
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return $this->_kdf; |
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} |
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/** |
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* Get encryption scheme algorithm identifier. |
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* |
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* @return BlockCipherAlgorithmIdentifier |
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*/ |
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public function esAlgorithmIdentifier(): BlockCipherAlgorithmIdentifier |
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{ |
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return $this->_es; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return Sequence |
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*/ |
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protected function _paramsASN1(): ?Element |
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{ |
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return new Sequence($this->_kdf->toASN1(), $this->_es->toASN1()); |
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} |
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} |
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sop /
pkcs5
