105 lines
3.1 KiB
PHP
105 lines
3.1 KiB
PHP
<?php
|
|
/**
|
|
* @author Lukas Reschke <lukas@owncloud.com>
|
|
* @author Morris Jobke <hey@morrisjobke.de>
|
|
*
|
|
* @copyright Copyright (c) 2015, ownCloud, Inc.
|
|
* @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 RandomLib;
|
|
use Sabre\DAV\Exception;
|
|
use OCP\Security\ISecureRandom;
|
|
|
|
/**
|
|
* Class SecureRandom provides a layer around RandomLib to generate
|
|
* secure random strings. For PHP 7 the native CSPRNG is used.
|
|
*
|
|
* Usage:
|
|
* \OC::$server->getSecureRandom()->getMediumStrengthGenerator()->generate(10);
|
|
*
|
|
* @package OC\Security
|
|
*/
|
|
class SecureRandom implements ISecureRandom {
|
|
|
|
/** @var \RandomLib\Factory */
|
|
var $factory;
|
|
/** @var \RandomLib\Generator */
|
|
var $generator;
|
|
|
|
function __construct() {
|
|
$this->factory = new RandomLib\Factory;
|
|
}
|
|
|
|
/**
|
|
* Convenience method to get a low strength random number generator.
|
|
*
|
|
* Low Strength should be used anywhere that random strings are needed
|
|
* in a non-cryptographical setting. They are not strong enough to be
|
|
* used as keys or salts. They are however useful for one-time use tokens.
|
|
*
|
|
* @return $this
|
|
*/
|
|
public function getLowStrengthGenerator() {
|
|
$this->generator = $this->factory->getLowStrengthGenerator();
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Convenience method to get a medium strength random number generator.
|
|
*
|
|
* Medium Strength should be used for most needs of a cryptographic nature.
|
|
* They are strong enough to be used as keys and salts. However, they do
|
|
* take some time and resources to generate, so they should not be over-used
|
|
*
|
|
* @return $this
|
|
*/
|
|
public function getMediumStrengthGenerator() {
|
|
$this->generator = $this->factory->getMediumStrengthGenerator();
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Generate a random string of specified length.
|
|
* @param int $length The length of the generated string
|
|
* @param string $characters An optional list of characters to use if no character list is
|
|
* specified all valid base64 characters are used.
|
|
* @return string
|
|
* @throws \Exception If the generator is not initialized.
|
|
*/
|
|
public function generate($length,
|
|
$characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/') {
|
|
if(is_null($this->generator)) {
|
|
throw new \Exception('Generator is not initialized.');
|
|
}
|
|
|
|
if(function_exists('random_int')) {
|
|
$maxCharIndex = strlen($characters) - 1;
|
|
$randomString = '';
|
|
|
|
while($length > 0) {
|
|
$randomNumber = random_int(0, $maxCharIndex);
|
|
$randomString .= $characters[$randomNumber];
|
|
$length--;
|
|
}
|
|
return $randomString;
|
|
}
|
|
|
|
return $this->generator->generateString($length, $characters);
|
|
}
|
|
}
|