vendor/paragonie/random_compat/lib/random_bytes_mcrypt.php

   1 <?php
   2 /**
   3  * Random_* Compatibility Library
   4  * for using the new PHP 7 random_* API in PHP 5 projects
   5  *
   6  * The MIT License (MIT)
   7  *
   8  * Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29 if (!is_callable('random_bytes')) {
  30     /**
  31      * Powered by ext/mcrypt (and thankfully NOT libmcrypt)
  32      *
  33      * @ref https://bugs.php.net/bug.php?id=55169
  34      * @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
  35      *
  36      * @param int $bytes
  37      *
  38      * @throws Exception
  39      *
  40      * @return string
  41      */
  42     function random_bytes($bytes)
  43     {
  44         try {
  45             $bytes = RandomCompat_intval($bytes);
  46         } catch (TypeError $ex) {
  47             throw new TypeError(
  48                 'random_bytes(): $bytes must be an integer'
  49             );
  50         }
  51
  52         if ($bytes < 1) {
  53             throw new Error(
  54                 'Length must be greater than 0'
  55             );
  56         }
  57
  58         $buf = @mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM);
  59         if (
  60             $buf !== false
  61             &&
  62             RandomCompat_strlen($buf) === $bytes
  63         ) {
  64             /**
  65              * Return our random entropy buffer here:
  66              */
  67             return $buf;
  68         }
  69
  70         /**
  71          * If we reach here, PHP has failed us.
  72          */
  73         throw new Exception(
  74             'Could not gather sufficient random data'
  75         );
  76     }
  77 }