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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Security;
use OCP\Security\ISecureRandom;
/**
* Class SecureRandom provides a wrapper around the random_int function to generate
* secure random strings. For PHP 7 the native CSPRNG is used, older versions do
* use a fallback.
*
* Usage:
* \OC::$server->getSecureRandom()->generate(10);
* @package OC\Security
*/
class SecureRandom implements ISecureRandom {
/**
* Generate a secure random string of specified length.
* @param int $length The length of the generated string
* @param string $characters An optional list of characters to use if no character list is
* specified all valid base64 characters are used.
* @return string
* @throws \LengthException if an invalid length is requested
*/
public function generate(int $length,
string $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'): string {
if ($length <= 0) {
throw new \LengthException('Invalid length specified: ' . $length . ' must be bigger than 0');
}
$maxCharIndex = \strlen($characters) - 1;
$randomString = '';
while ($length > 0) {
$randomNumber = \random_int(0, $maxCharIndex);
$randomString .= $characters[$randomNumber];
$length--;
}
return $randomString;
}
}
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