CI_Encryption::_openssl_initialize PHP Method

    protected function _openssl_initialize($params)
    {
        if (!empty($params['cipher'])) {
            $params['cipher'] = strtolower($params['cipher']);
            $this->_cipher_alias($params['cipher']);
            $this->_cipher = $params['cipher'];
        }
        if (!empty($params['mode'])) {
            $params['mode'] = strtolower($params['mode']);
            if (!isset($this->_modes['openssl'][$params['mode']])) {
                log_message('error', 'Encryption: OpenSSL mode ' . strtoupper($params['mode']) . ' is not available.');
            } else {
                $this->_mode = $this->_modes['openssl'][$params['mode']];
            }
        }
        if (isset($this->_cipher, $this->_mode)) {
            // This is mostly for the stream mode, which doesn't get suffixed in OpenSSL
            $handle = empty($this->_mode) ? $this->_cipher : $this->_cipher . '-' . $this->_mode;
            if (!in_array($handle, openssl_get_cipher_methods(), TRUE)) {
                $this->_handle = NULL;
                log_message('error', 'Encryption: Unable to initialize OpenSSL with method ' . strtoupper($handle) . '.');
            } else {
                $this->_handle = $handle;
                log_message('info', 'Encryption: OpenSSL initialized with method ' . strtoupper($handle) . '.');
            }
        }
    }