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. /** * This file contains functions used by upgrade and install. * * Because this is used during install it should not include additional files. * * @package enrol_lti * @copyright 2021 Jake Dallimore * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * This function checks if a private key has been generated for this enrolment instance. * * If the key does not exist it generates a new one. If the openssl * extension is not installed or configured properly it returns a warning message. * * @return string A warning message if a private key does not exist and cannot be generated. */ function enrol_lti_verify_private_key() { $name = 'lti_13_kid'; $key = get_config('enrol_lti', $name); // If we already generated a valid key, no need to check. if (empty($key)) { // Create the private key. $kid = bin2hex(openssl_random_pseudo_bytes(10)); set_config($name, $kid, 'enrol_lti'); $config = array( "digest_alg" => "sha256", "private_key_bits" => 2048, "private_key_type" => OPENSSL_KEYTYPE_RSA, ); $res = openssl_pkey_new($config); openssl_pkey_export($res, $privatekey); if (!empty($privatekey)) { set_config('lti_13_privatekey', $privatekey, 'enrol_lti'); } else { return get_string('opensslconfiginvalid', 'enrol_lti'); } } return ''; }