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random_bytes_mcrypt.php (2521B)

      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 - 2017 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 }