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/wp-includes/random_compat/ -> random_bytes_com_dotnet.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       * Windows with PHP < 5.3.0 will not have the function
  32       * openssl_random_pseudo_bytes() available, so let's use
  33       * CAPICOM to work around this deficiency.
  34       *
  35       * @param int $bytes
  36       *
  37       * @throws Exception
  38       *
  39       * @return string
  40       */
  41      function random_bytes($bytes)
  42      {
  43          try {
  44              $bytes = RandomCompat_intval($bytes);
  45          } catch (TypeError $ex) {
  46              throw new TypeError(
  47                  'random_bytes(): $bytes must be an integer'
  48              );
  49          }
  50  
  51          if ($bytes < 1) {
  52              throw new Error(
  53                  'Length must be greater than 0'
  54              );
  55          }
  56  
  57          $buf = '';
  58          if (!class_exists('COM')) {
  59              throw new Error(
  60                  'COM does not exist'
  61              );
  62          }
  63          $util = new COM('CAPICOM.Utilities.1');
  64          $execCount = 0;
  65  
  66          /**
  67           * Let's not let it loop forever. If we run N times and fail to
  68           * get N bytes of random data, then CAPICOM has failed us.
  69           */
  70          do {
  71              $buf .= base64_decode($util->GetRandom($bytes, 0));
  72              if (RandomCompat_strlen($buf) >= $bytes) {
  73                  /**
  74                   * Return our random entropy buffer here:
  75                   */
  76                  return RandomCompat_substr($buf, 0, $bytes);
  77              }
  78              ++$execCount;
  79          } while ($execCount < $bytes);
  80  
  81          /**
  82           * If we reach here, PHP has failed us.
  83           */
  84          throw new Exception(
  85              'Could not gather sufficient random data'
  86          );
  87      }
  88  }


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