SessionStorage.php

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<?php
namespace TYPO3\CMS\Rsaauth\Storage;

class SessionStorage extends \TYPO3\CMS\Rsaauth\Storage\AbstractStorage {

    public function __construct() {
        if (!isset($_SESSION) || !is_array($_SESSION)) {
            session_start();
        }
    }

    public function get() {
        return isset($_SESSION['tx_rsaauth_key']) ? $_SESSION['tx_rsaauth_key'] : NULL;
    }

    public function put($key) {
        $_SESSION['tx_rsaauth_key'] = $key;
    }

}