90 lines
2.7 KiB
PHP
90 lines
2.7 KiB
PHP
<?php
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/**
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* @author Lukas Reschke <lukas@owncloud.com>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Security;
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use RandomLib;
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use Sabre\DAV\Exception;
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use OCP\Security\ISecureRandom;
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/**
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* Class SecureRandom provides a layer around RandomLib to generate
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* secure random strings.
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*
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* Usage:
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* \OC::$server->getSecureRandom()->getMediumStrengthGenerator()->generate(10);
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*
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* @package OC\Security
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*/
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class SecureRandom implements ISecureRandom {
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/** @var \RandomLib\Factory */
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var $factory;
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/** @var \RandomLib\Generator */
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var $generator;
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function __construct() {
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$this->factory = new RandomLib\Factory;
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}
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/**
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* Convenience method to get a low strength random number generator.
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*
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* Low Strength should be used anywhere that random strings are needed
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* in a non-cryptographical setting. They are not strong enough to be
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* used as keys or salts. They are however useful for one-time use tokens.
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*
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* @return $this
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*/
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public function getLowStrengthGenerator() {
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$this->generator = $this->factory->getLowStrengthGenerator();
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return $this;
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}
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/**
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* Convenience method to get a medium strength random number generator.
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*
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* Medium Strength should be used for most needs of a cryptographic nature.
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* They are strong enough to be used as keys and salts. However, they do
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* take some time and resources to generate, so they should not be over-used
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*
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* @return $this
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*/
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public function getMediumStrengthGenerator() {
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$this->generator = $this->factory->getMediumStrengthGenerator();
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return $this;
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}
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/**
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* Generate a random string of specified length.
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* @param string $length The length of the generated string
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* @param string $characters An optional list of characters to use if no characterlist is
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* specified all valid base64 characters are used.
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* @return string
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* @throws \Exception If the generator is not initialized.
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*/
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public function generate($length, $characters = '') {
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if(is_null($this->generator)) {
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throw new \Exception('Generator is not initialized.');
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}
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return $this->generator->generateString($length, $characters);
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}
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}
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