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<?php |
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/** |
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* Encrypt/decrypt data to a format compatible with MySQL aes_encrypt() & aes_decrypt() functions. |
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* |
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* @author Bob Fanger <[email protected]> |
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* @author Anne Jan Brouwer <[email protected]> |
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* @author Govert Verschuur <[email protected]> |
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* @author Renan Martins Pimentel <[email protected]> |
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* @copyright 2016 NoProtocol |
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* @license https://opensource.org/licenses/MIT The MIT License (MIT) |
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* |
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* @version 2.0.1 |
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* |
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* @link http://www.smashingmagazine.com/2012/05/replicating-mysql-aes-encryption-methods-with-php/ |
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*/ |
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namespace NoProtocol\Encryption\MySQL\AES; |
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class Crypter |
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{ |
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protected $method; |
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protected $key; |
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/** |
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* Crypter constructor. |
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* |
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* @param $seed |
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* @param string $method default AES-128-ECB |
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*/ |
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public function __construct($seed, $method = 'AES-128-ECB') |
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{ |
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$this->method = $method; |
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$this->key = $this->generateKey($seed); |
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} |
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/** |
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* Encrypts the data. |
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* |
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* @since 2.0 |
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* |
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* @param string $data A string of data to encrypt. |
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* |
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* @return string (binary) The encrypted data |
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*/ |
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public function encrypt($data) |
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{ |
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$chiperIvLength = openssl_cipher_iv_length($this->method); |
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$iv = ''; |
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if ($chiperIvLength > 0) { |
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$iv = openssl_random_pseudo_bytes($chiperIvLength); |
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} |
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$padValue = 16 - (strlen($data) % 16); |
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return openssl_encrypt( |
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str_pad($data, intval(16 * (floor(strlen($data) / 16) + 1)), chr($padValue)), |
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$this->method, |
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$this->key, |
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, |
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$iv |
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); |
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} |
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/** |
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* Decrypts the data. |
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* |
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* @since 2.0 |
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* |
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* @param string $data A (binary) string of encrypted data |
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* |
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* @return string Decrypted data |
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*/ |
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public function decrypt($data) |
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{ |
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$data = openssl_decrypt( |
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$data, |
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$this->method, |
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$this->key, |
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING |
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); |
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return rtrim($data, "\x00..\x10"); |
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} |
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/** |
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* Create and set the key used for encryption. |
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* |
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* @since 2.0 |
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* |
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* @param string $seed The seed used to create the key. |
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* |
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* @return string (binary) the key to use in the encryption process. |
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*/ |
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protected function generateKey($seed) |
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{ |
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$key = str_repeat(chr(0), 16); |
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for ($i = 0, $len = strlen($seed); $i < $len; $i++) { |
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$key[$i % 16] = $key[$i % 16] ^ $seed[$i]; |
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} |
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return $key; |
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} |
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} |
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noprotocol /
php-mysql-aes-crypt
