62 lines
1.8 KiB
PHP
62 lines
1.8 KiB
PHP
<?php
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/**
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* Copyright (c) 2014 Lukas Reschke <lukas@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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namespace OCP\Security;
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/**
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* Class SecureRandom provides a layer around RandomLib to generate
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* secure random numbers.
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*
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* Usage:
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* $rng = new \OC\Security\SecureRandom();
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* $randomString = $rng->getMediumStrengthGenerator()->generateString(30);
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*
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* @package OCP\Security
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*/
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interface ISecureRandom {
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/**
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* Flags for characters that can be used for <code>generate($length, $characters)</code>
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*/
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const CHAR_UPPER = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
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const CHAR_LOWER = 'abcdefghijklmnopqrstuvwxyz';
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const CHAR_DIGITS = '0123456789';
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const CHAR_SYMBOLS = '!\"#$%&\\\'()* +,-./:;<=>?@[\]^_`{|}~';
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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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/**
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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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/**
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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 $characters An optional list of characters to use
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* @return string
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* @throws \Exception
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*/
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public function generate($length, $characters = '');
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}
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