Method __construct

/**
 * Initialise the AES encryption object.
 *
 * Note: If the key is not 16 bytes this class will do a stupid key expansion for legacy reasons (produce the
 * SHA-256 of the key string and throw away half of it).
 *
 * @param   string          $key      The encryption key (password). It can be a raw key (16 bytes) or a passphrase.
 * @param   int             $strength Bit strength (128, 192 or 256) – ALWAYS USE 128 BITS. THIS PARAMETER IS DEPRECATED.
 * @param   string          $mode     Encryption mode. Can be ebc or cbc. We recommend using cbc.
 * @param   string          $priority Priority which adapter we should try first
 */
public function __construct($key, $strength = 128, $mode = 'cbc', $priority = 'openssl')
{
    if ($priority === 'openssl') {
        $this->adapter = new OpenSSL();
        if (!$this->adapter->isSupported()) {
            $this->adapter = new Mcrypt();
        }
    } else {
        $this->adapter = new Mcrypt();
        if (!$this->adapter->isSupported()) {
            $this->adapter = new OpenSSL();
        }
    }
    $this->adapter->setEncryptionMode($mode, $strength);
    $this->setPassword($key, true);
}