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<?php |
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/** |
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* This file is part of Blitz PHP framework. |
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* |
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* (c) 2022 Dimitri Sitchet Tomkeu <[email protected]> |
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* |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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namespace BlitzPHP\Security\Encryption\Handlers; |
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use BlitzPHP\Exceptions\EncryptionException; |
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/** |
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* Gestionnaire de chiffrement basé sur la librairie Sodium |
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* |
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* @see https://github.com/jedisct1/libsodium/issues/392 |
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* @credit <a href="http://www.codeigniter.com">CodeIgniter 4.4 - \CodeIgniter\Encryption\Handlers\SodiumHandler</a> |
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*/ |
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class SodiumHandler extends BaseHandler |
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{ |
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/** |
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* Clé de démarrage |
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*/ |
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protected string $key = ''; |
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/** |
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* Taille du bloc pour le message de remplissage. |
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*/ |
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protected int $blockSize = 16; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function encrypt(string $data, null|array|string $params = null): string |
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{ |
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$this->parseParams($params); |
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if (empty($this->key)) { |
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throw EncryptionException::needsStarterKey(); |
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} |
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// créer un occasionnel pour cette opération |
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$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); // 24 bytes |
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// ajouter du remplissage avant de chiffrer les données |
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if ($this->blockSize <= 0) { |
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throw EncryptionException::encryptionFailed(); |
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} |
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$data = sodium_pad($data, $this->blockSize); |
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// chiffrer le message et combiner avec occasionnel |
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$ciphertext = $nonce . sodium_crypto_secretbox($data, $nonce, $this->key); |
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// tampons de nettoyage |
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sodium_memzero($data); |
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sodium_memzero($this->key); |
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return $ciphertext; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function decrypt(string $data, null|array|string $params = null): string |
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{ |
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$this->parseParams($params); |
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if (empty($this->key)) { |
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throw EncryptionException::needsStarterKey(); |
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} |
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if (mb_strlen($data, '8bit') < (SODIUM_CRYPTO_SECRETBOX_NONCEBYTES + SODIUM_CRYPTO_SECRETBOX_MACBYTES)) { |
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// le message a été tronqué |
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throw EncryptionException::authenticationFailed(); |
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} |
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// Extraire des informations à partir de données cryptées |
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$nonce = self::substr($data, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
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$ciphertext = self::substr($data, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
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// décrypter les données |
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$data = sodium_crypto_secretbox_open($ciphertext, $nonce, $this->key); |
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if ($data === false) { |
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// le message a été falsifié pendant le transit |
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throw EncryptionException::authenticationFailed(); // @codeCoverageIgnore |
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} |
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// supprimer le remplissage supplémentaire pendant le cryptage |
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if ($this->blockSize <= 0) { |
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throw EncryptionException::authenticationFailed(); |
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} |
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$data = sodium_unpad($data, $this->blockSize); |
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// tampons de nettoyage |
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sodium_memzero($ciphertext); |
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sodium_memzero($this->key); |
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return $data; |
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} |
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/** |
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* Analysez les $params avant de faire l'affectation. |
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* |
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* @throws EncryptionException si la cle est vide |
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*/ |
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protected function parseParams(null|array|string $params): void |
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{ |
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if ($params === null) { |
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return; |
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} |
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if (is_array($params)) { |
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if (isset($params['key'])) { |
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$this->key = $params['key']; |
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} |
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if (isset($params['block_size'], $params['blockSize'])) { |
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$this->blockSize = $params['block_size'] ?? $params['blockSize']; |
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} |
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return; |
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} |
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$this->key = (string) $params; |
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} |
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} |
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blitz-php /
framework
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