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random_bytes_mcrypt.php 2.5KB

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  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. if (!is_callable('random_bytes')) {
  29. /**
  30. * Powered by ext/mcrypt (and thankfully NOT libmcrypt)
  31. *
  32. * @ref https://bugs.php.net/bug.php?id=55169
  33. * @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
  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(): $bytes must be an integer'
  48. );
  49. }
  50. if ($bytes < 1) {
  51. throw new Error(
  52. 'Length must be greater than 0'
  53. );
  54. }
  55. $buf = @mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM);
  56. if (
  57. $buf !== false
  58. &&
  59. RandomCompat_strlen($buf) === $bytes
  60. ) {
  61. /**
  62. * Return our random entropy buffer here:
  63. */
  64. return $buf;
  65. }
  66. /**
  67. * If we reach here, PHP has failed us.
  68. */
  69. throw new Exception(
  70. 'Could not gather sufficient random data'
  71. );
  72. }
  73. }