DecryptionHook.php

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

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\DataHandling\DataHandler;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Rsaauth\RsaEncryptionDecoder;

class DecryptionHook
{
    public function processDatamap_preProcessFieldArray(&$incomingFieldArray, $table, $id, $parentObject)
    {
        $serializedString = serialize($incomingFieldArray);
        if (strpos($serializedString, 'rsa:') === false) {
            return;
        }

        $rsaEncryptionDecoder = GeneralUtility::makeInstance(RsaEncryptionDecoder::class);
        $incomingFieldArray = $rsaEncryptionDecoder->decrypt($incomingFieldArray);
    }
}