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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\XML; |
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use SimpleSAML\XMLSecurity\Alg\Encryption\EncryptionAlgorithmFactory; |
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use SimpleSAML\XMLSecurity\Alg\Encryption\EncryptionAlgorithmInterface; |
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use SimpleSAML\XMLSecurity\Backend\EncryptionBackend; |
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use SimpleSAML\XMLSecurity\Constants as C; |
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use SimpleSAML\XMLSecurity\Key\SymmetricKey; |
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use SimpleSAML\XMLSecurity\XML\ds\KeyInfo; |
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use SimpleSAML\XMLSecurity\XML\xenc\CipherData; |
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use SimpleSAML\XMLSecurity\XML\xenc\CipherValue; |
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use SimpleSAML\XMLSecurity\XML\xenc\EncryptedData; |
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use SimpleSAML\XMLSecurity\XML\xenc\EncryptedKey; |
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use SimpleSAML\XMLSecurity\XML\xenc\EncryptionMethod; |
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/** |
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* Trait aggregating functionality for elements that can be encrypted. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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trait EncryptableElementTrait |
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{ |
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/** |
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* The length of the session key to use when encrypting. |
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* |
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* Override to change it if desired. |
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* |
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* @var int |
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*/ |
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protected int $sessionKeyLen = 16; |
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/** |
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* The identifier of the block cipher to use to encrypt this object. |
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* |
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* Override to change it if desired. |
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* |
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* @var string |
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*/ |
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protected string $blockCipherAlgId = C::BLOCK_ENC_AES256_GCM; |
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/** |
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* Encryt this object. |
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* |
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* @param \SimpleSAML\XMLSecurity\Alg\Encryption\EncryptionAlgorithmInterface $encryptor The encryptor to use, |
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* either to encrypt the object itself, or to encrypt a session key (if the encryptor implements a key transport |
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* algorithm). |
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* |
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* @return \SimpleSAML\XMLSecurity\XML\xenc\EncryptedData |
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*/ |
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public function encrypt(EncryptionAlgorithmInterface $encryptor): EncryptedData |
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{ |
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$keyInfo = null; |
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if (in_array($encryptor->getAlgorithmId(), C::$KEY_TRANSPORT_ALGORITHMS)) { |
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// the encryptor uses a key transport algorithm, use that to generate a session key |
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$sessionKey = SymmetricKey::generate($this->sessionKeyLen); |
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$encryptedKey = EncryptedKey::fromKey( |
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$sessionKey, |
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$encryptor, |
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new EncryptionMethod($encryptor->getAlgorithmId()), |
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); |
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$keyInfo = new KeyInfo([$encryptedKey]); |
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$factory = new EncryptionAlgorithmFactory( |
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$this->getBlacklistedAlgorithms() ?? EncryptionAlgorithmFactory::DEFAULT_BLACKLIST, |
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); |
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$encryptor = $factory->getAlgorithm($this->blockCipherAlgId, $sessionKey); |
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$encryptor->setBackend($this->getEncryptionBackend()); |
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} |
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$xmlRepresentation = $this->toXML(); |
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return new EncryptedData( |
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new CipherData( |
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new CipherValue( |
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base64_encode($encryptor->encrypt($xmlRepresentation->ownerDocument->saveXML($xmlRepresentation))), |
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), |
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), |
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null, |
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C::XMLENC_ELEMENT, |
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null, |
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null, |
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new EncryptionMethod($encryptor->getAlgorithmId()), |
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$keyInfo, |
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); |
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} |
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/** |
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* Get the encryption backend to use for any encryption operation. |
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* |
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* @return \SimpleSAML\XMLSecurity\Backend\EncryptionBackend|null The encryption backend to use, or null if we |
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* want to use the default. |
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*/ |
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abstract public function getEncryptionBackend(): ?EncryptionBackend; |
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/** |
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* Get the list of algorithms that are blacklisted for any encryption operation. |
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* |
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* @return string[]|null An array with all algorithm identifiers that are blacklisted, or null to use this |
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* libraries default. |
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*/ |
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abstract public function getBlacklistedAlgorithms(): ?array; |
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/** |
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* Return a string representation of this object. |
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* |
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* @return string |
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*/ |
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abstract public function __toString(): string; |
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} |
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simplesamlphp /
xml-security
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