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/wp-includes/random_compat/ -> random_bytes_mcrypt.php (source)

   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  }


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