Nelmio\SecurityBundle\Encrypter::__construct PHP Метод

    public function __construct($secret, $algorithm)
    {
        $this->secret = substr($secret, 0, 32);
        $this->algorithm = $algorithm;
        if (!function_exists('mcrypt_module_open')) {
            throw new \RuntimeException('You need to install mcrypt if you want to encrypt your cookies.');
        }
        $this->module = @mcrypt_module_open($this->algorithm, '', MCRYPT_MODE_CBC, '');
        if ($this->module === false) {
            throw new \InvalidArgumentException(sprintf("The supplied encryption algorithm '%s' is not supported by this system.", $this->algorithm));
        }
        $this->ivSize = mcrypt_enc_get_iv_size($this->module);
        @trigger_error('Encrypted Cookie is now deprecated due to high coupling with the deprecated mcrypt extension', E_USER_NOTICE);
    }