60 lines
2.0 KiB
PHP
60 lines
2.0 KiB
PHP
<?php
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/**
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* Copyright 2017 Facebook, Inc.
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*
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to
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* use, copy, modify, and distribute this software in source code or binary
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* form for use in connection with the web services and APIs provided by
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* Facebook.
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*
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* As with any software that integrates with the Facebook platform, your use
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* of this software is subject to the Facebook Developer Principles and
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* Policies [http://developers.facebook.com/policy/]. This copyright notice
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* shall be included in all copies or substantial portions of the software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace Facebook\PseudoRandomString;
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use Facebook\Exceptions\FacebookSDKException;
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class RandomBytesPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
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{
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use PseudoRandomStringGeneratorTrait;
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/**
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* @const string The error message when generating the string fails.
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*/
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const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from random_bytes(). ';
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/**
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* @throws FacebookSDKException
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*/
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public function __construct()
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{
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if (!function_exists('random_bytes')) {
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throw new FacebookSDKException(
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static::ERROR_MESSAGE .
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'The function random_bytes() does not exist.'
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);
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}
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}
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/**
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* @inheritdoc
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*/
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public function getPseudoRandomString($length)
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{
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$this->validateLength($length);
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return $this->binToHex(random_bytes($length), $length);
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}
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}
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