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<?php |
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/** |
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* File AesEncrypter.php |
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*/ |
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namespace Tebru\AesEncryption; |
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use Tebru; |
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use Tebru\AesEncryption\Enum\AesEnum; |
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use Tebru\AesEncryption\Exception\IvSizeMismatchException; |
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use Tebru\AesEncryption\Exception\MacHashMismatchException; |
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use Tebru\AesEncryption\Strategy\AesEncryptionStrategy; |
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use Tebru\AesEncryption\Strategy\McryptStrategy; |
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use Tebru\AesEncryption\Strategy\OpenSslStrategy; |
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/** |
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* Class AesEncrypter |
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* |
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* @author Nate Brunette <[email protected]> |
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*/ |
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class AesEncrypter |
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{ |
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const STRATEGY_OPENSSL = 'openssl'; |
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const STRATEGY_MCRYPT = 'mcrypt'; |
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/** |
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* @var AesEncryptionStrategy |
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*/ |
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private $strategy; |
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/** |
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* Constructor |
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* |
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* @param string $key The secret key |
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* @param string $method |
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* @param AesEncryptionStrategy $strategy |
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*/ |
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public function __construct($key, $method = AesEnum::METHOD_256, $strategy = null) |
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{ |
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if (null === $strategy) { |
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// use openssl if it exists |
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$strategy = (function_exists('openssl_encrypt')) |
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? new OpenSslStrategy($key, $method) |
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: new McryptStrategy($key, $method); |
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} else { |
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$strategy = (self::STRATEGY_OPENSSL === $strategy) |
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? new OpenSslStrategy($key, $method) |
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: new McryptStrategy($key, $method); |
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} |
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$this->strategy = $strategy; |
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} |
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/** |
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* Encrypts any data using mac-then-encrypt method |
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* |
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* @param mixed $data |
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* @return string |
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*/ |
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public function encrypt($data) |
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{ |
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$serializedData = serialize($data); |
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$iv = $this->strategy->createIv(); |
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$encrypted = $this->strategy->encryptData($serializedData, $iv); |
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$mac = $this->strategy->getMac($encrypted); |
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$encoded = $this->strategy->encodeData($encrypted, $mac, $iv); |
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return $encoded; |
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} |
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/** |
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* Decrypts data encrypted through encrypt() method |
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* |
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* @param string $data |
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* @return mixed |
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* @throws IvSizeMismatchException If the IV length has been altered |
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* @throws MacHashMismatchException If the data has been altered |
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*/ |
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public function decrypt($data) |
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{ |
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// if this is not an encrypted string |
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if (false === strpos($data, '|')) { |
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return $data; |
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} |
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list($encryptedData, $mac, $iv) = $this->strategy->decodeData($data); |
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Tebru\assert($mac === $this->strategy->getMac($encryptedData), new MacHashMismatchException('MAC hashes do not match')); |
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Tebru\assert(strlen($iv) === $this->strategy->getIvSize(), new IvSizeMismatchException('IV size does not match expectation')); |
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$serializedData = $this->strategy->decryptData($encryptedData, $iv); |
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$decrypted = unserialize($serializedData); |
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return $decrypted; |
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} |
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} |
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tebru /
aes-encryption
