publicKey.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * This script is used by external MUMIE/LEMON servers to retrieve the public key
 *
 * @package auth_mumie
 * @copyright  2017-2020 integral-learning GmbH (https://www.integral-learning.de/)
 * @author Tobias Goltz (tobias.goltz@integral-learning.de)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once("../../config.php");
require_once($CFG->dirroot . '/auth/mumie/classes/cryptography/mumie_cryptography_service.php');

$publickey = mumie_cryptography_service::get_public_key();
if (!$publickey) {
    http_response_code(404);
    return;
}
echo $publickey->get_keyvalue();