SplitStorage.php

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

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

    public function __construct() {
        if (session_id() === '') {
            session_start();
        }
    }

    public function get() {
        $result = NULL;
        list($keyId, $keyPart1) = $_SESSION['tx_rsaauth_key'];
        if (\TYPO3\CMS\Core\Utility\MathUtility::canBeInterpretedAsInteger($keyId)) {
            // Remove expired keys (more than 30 minutes old)
            $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys', 'crdate<' . ($GLOBALS['EXEC_TIME'] - 30 * 60));
            // Get our value
            $row = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('key_value', 'tx_rsaauth_keys', 'uid=' . $keyId);
            if (is_array($row)) {
                $result = $keyPart1 . $row['key_value'];
            }
        }
        return $result;
    }

    public function put($key) {
        if ($key == NULL) {
            // Remove existing key
            list($keyId) = $_SESSION['tx_rsaauth_key'];
            if (\TYPO3\CMS\Core\Utility\MathUtility::canBeInterpretedAsInteger($keyId)) {
                $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys', 'uid=' . $keyId);
                unset($_SESSION['tx_rsaauth_key']);
            }
        } else {
            // Add key
            // Get split point. First part is always smaller than the second
            // because it goes to the file system
            $keyLength = strlen($key);
            $splitPoint = rand((int)($keyLength / 10), (int)($keyLength / 2));
            // Get key parts
            $keyPart1 = substr($key, 0, $splitPoint);
            $keyPart2 = substr($key, $splitPoint);
            // Store part of the key in the database
            //
            // Notice: we may not use TCEmain below to insert key part into the
            // table because TCEmain requires a valid BE user!
            $time = $GLOBALS['EXEC_TIME'];
            $GLOBALS['TYPO3_DB']->exec_INSERTquery('tx_rsaauth_keys', array(
                'pid' => 0,
                'crdate' => $time,
                'key_value' => $keyPart2
            ));
            $keyId = $GLOBALS['TYPO3_DB']->sql_insert_id();
            // Store another part in session
            $_SESSION['tx_rsaauth_key'] = array($keyId, $keyPart1);
        }
        // Remove expired keys (more than 30 minutes old)
        $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys', 'crdate<' . ($GLOBALS['EXEC_TIME'] - 30 * 60));
    }

}