86 lines
2.8 KiB
PHP
86 lines
2.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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*
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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 OCP\Security\ISecureRandom;
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/**
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* Class SecureRandom provides a wrapper around the random_int function to generate
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* secure random strings. For PHP 7 the native CSPRNG is used, older versions do
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* use a fallback.
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*
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* Usage:
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* \OC::$server->getSecureRandom()->generate(10);
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* @package OC\Security
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*/
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class SecureRandom implements ISecureRandom {
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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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* @deprecated 9.0.0 Use \OC\Security\SecureRandom::generate directly or random_bytes() / random_int()
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* @return $this
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*/
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public function 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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* @deprecated 9.0.0 Use \OC\Security\SecureRandom::generate directly or random_bytes() / random_int()
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* @return $this
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*/
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public function 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 int $length The length of the generated string
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* @param string $characters An optional list of characters to use if no character list is
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* specified all valid base64 characters are used.
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* @return string
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*/
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public function generate($length,
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$characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/') {
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$maxCharIndex = strlen($characters) - 1;
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$randomString = '';
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while($length > 0) {
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$randomNumber = \random_int(0, $maxCharIndex);
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$randomString .= $characters[$randomNumber];
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$length--;
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}
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return $randomString;
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}
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}
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