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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 OpenSSL |
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* |
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* @credit <a href="http://www.codeigniter.com">CodeIgniter 4.4 - \CodeIgniter\Encryption\Handlers\OpenSSLHandler</a> |
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*/ |
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class OpenSSLHandler extends BaseHandler |
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{ |
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/** |
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* HMAC digest à utiliser |
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*/ |
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protected string $digest = 'SHA512'; |
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/** |
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* Liste des algorithmes HMAC pris en charge |
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* |
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* @var array [name => digest size] |
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*/ |
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protected array $digestSize = [ |
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'SHA224' => 28, |
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'SHA256' => 32, |
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'SHA384' => 48, |
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'SHA512' => 64, |
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]; |
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/** |
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* Chiffrement à utiliser |
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*/ |
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protected string $cipher = 'AES-256-CTR'; |
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/** |
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* Indique si le texte chiffré doit être brut. S'il est défini sur false, il sera codé en base64. |
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*/ |
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protected bool $rawData = true; |
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/** |
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* Informations sur la clé de cryptage. |
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* Ce paramètre est uniquement utilisé par OpenSSLHandler. |
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*/ |
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public string $encryptKeyInfo = ''; |
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/** |
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* Informations sur la clé d'authentification. |
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* Ce paramètre est uniquement utilisé par OpenSSLHandler. |
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*/ |
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public string $authKeyInfo = ''; |
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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 $params = null): string |
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{ |
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// Autoriser le remplacement de clé |
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if ($params) { |
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$this->key = is_array($params) && isset($params['key']) ? $params['key'] : $params; |
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} |
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if (empty($this->key)) { |
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throw EncryptionException::needsStarterKey(); |
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} |
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// derive a secret key |
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$encryptKey = \hash_hkdf($this->digest, $this->key, 0, $this->encryptKeyInfo); |
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// cryptage de base |
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$iv = ($ivSize = \openssl_cipher_iv_length($this->cipher)) ? \openssl_random_pseudo_bytes($ivSize) : null; |
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$data = \openssl_encrypt($data, $this->cipher, $encryptKey, OPENSSL_RAW_DATA, $iv); |
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if ($data === false) { |
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throw EncryptionException::encryptionFailed(); |
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} |
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$result = $this->rawData ? $iv . $data : base64_encode($iv . $data); |
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// dériver une clé secrète |
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$authKey = \hash_hkdf($this->digest, $this->key, 0, $this->authKeyInfo); |
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$hmacKey = \hash_hmac($this->digest, $result, $authKey, $this->rawData); |
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return $hmacKey . $result; |
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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 $params = null): string |
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{ |
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// Autoriser le remplacement de clé |
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if ($params) { |
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$this->key = is_array($params) && isset($params['key']) ? $params['key'] : $params; |
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} |
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if (empty($this->key)) { |
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throw EncryptionException::needsStarterKey(); |
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} |
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// dériver une clé secrète |
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$authKey = \hash_hkdf($this->digest, $this->key, 0, $this->authKeyInfo); |
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$hmacLength = $this->rawData |
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? $this->digestSize[$this->digest] |
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: $this->digestSize[$this->digest] * 2; |
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$hmacKey = self::substr($data, 0, $hmacLength); |
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$data = self::substr($data, $hmacLength); |
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$hmacCalc = \hash_hmac($this->digest, $data, $authKey, $this->rawData); |
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if (! hash_equals($hmacKey, $hmacCalc)) { |
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throw EncryptionException::authenticationFailed(); |
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} |
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$data = $this->rawData ? $data : base64_decode($data, true); |
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if ($ivSize = \openssl_cipher_iv_length($this->cipher)) { |
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$iv = self::substr($data, 0, $ivSize); |
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$data = self::substr($data, $ivSize); |
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} else { |
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$iv = null; |
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} |
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// dériver une clé secrète |
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$encryptKey = \hash_hkdf($this->digest, $this->key, 0, $this->encryptKeyInfo); |
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return \openssl_decrypt($data, $this->cipher, $encryptKey, OPENSSL_RAW_DATA, $iv); |
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} |
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} |
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blitz-php /
framework
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