/library/Zend/Crypt/Math.php

https://github.com/Unplagged/unplagged · PHP · 102 lines · 37 code · 7 blank · 58 comment · 5 complexity · 7dc59811d3fe8bed01ccb772c6ee599d MD5 · raw file 

    

  1. <?php

    2. 

  2. /**

    3. 

  3.  * Zend Framework

    4. 

  4.  *

    5. 

  5.  * LICENSE

    6. 

  6.  *

    7. 

  7.  * This source file is subject to the new BSD license that is bundled

    8. 

  8.  * with this package in the file LICENSE.txt.

    9. 

  9.  * It is also available through the world-wide-web at this URL:

    10. 

  10.  * http://framework.zend.com/license/new-bsd

    11. 

  11.  * If you did not receive a copy of the license and are unable to

    12. 

  12.  * obtain it through the world-wide-web, please send an email

    13. 

  13.  * to license@zend.com so we can send you a copy immediately.

    14. 

  14.  *

    15. 

  15.  * @category   Zend

    16. 

  16.  * @package    Zend_Crypt

    17. 

  17.  * @subpackage Math

    18. 

  18.  * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)

    19. 

  19.  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    20. 

  20.  * @version    $Id: Math.php 23775 2011-03-01 17:25:24Z ralph $

    21. 

  21.  */

    22. 

  22. 

    23. 

  23. /**

    24. 

  24.  * @see Zend_Crypt_Math_BigInteger

    25. 

  25.  */

    26. 

  26. require_once 'Zend/Crypt/Math/BigInteger.php';

    27. 

  27. 

    28. 

  28. /**

    29. 

  29.  * @category   Zend

    30. 

  30.  * @package    Zend_Crypt

    31. 

  31.  * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)

    32. 

  32.  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    33. 

  33.  */

    34. 

  34. class Zend_Crypt_Math extends Zend_Crypt_Math_BigInteger

    35. 

  35. {

    36. 

  36. 

    37. 

  37.     /**

    38. 

  38.      * Generate a pseudorandom number within the given range.

    39. 

  39.      * Will attempt to read from a systems RNG if it exists or else utilises

    40. 

  40.      * a simple random character to maximum length process. Simplicity

    41. 

  41.      * is a factor better left for development...

    42. 

  42.      *

    43. 

  43.      * @param string|int $minimum

    44. 

  44.      * @param string|int $maximum

    45. 

  45.      * @return string

    46. 

  46.      */

    47. 

  47.     public function rand($minimum, $maximum)

    48. 

  48.     {

    49. 

  49.         if (file_exists('/dev/urandom')) {

    50. 

  50.             $frandom = fopen('/dev/urandom', 'r');

    51. 

  51.             if ($frandom !== false) {

    52. 

  52.                 return fread($frandom, strlen($maximum) - 1);

    53. 

  53.             }

    54. 

  54.         }

    55. 

  55.         if (strlen($maximum) < 4) {

    56. 

  56.             return mt_rand($minimum, $maximum - 1);

    57. 

  57.         }

    58. 

  58.         $rand = '';

    59. 

  59.         $i2 = strlen($maximum) - 1;

    60. 

  60.         for ($i = 1;$i < $i2;$i++) {

    61. 

  61.             $rand .= mt_rand(0,9);

    62. 

  62.         }

    63. 

  63.         $rand .= mt_rand(0,9);

    64. 

  64.         return $rand;

    65. 

  65.     }

    66. 

  66. 

    67. 

  67.     /**

    68. 

  68.      * Get the big endian two's complement of a given big integer in

    69. 

  69.      * binary notation

    70. 

  70.      *

    71. 

  71.      * @param string $long

    72. 

  72.      * @return string

    73. 

  73.      */

    74. 

  74.     public function btwoc($long) {

    75. 

  75.         if (ord($long[0]) > 127) {

    76. 

  76.             return "\x00" . $long;

    77. 

  77.         }

    78. 

  78.         return $long;

    79. 

  79.     }

    80. 

  80. 

    81. 

  81.     /**

    82. 

  82.      * Translate a binary form into a big integer string

    83. 

  83.      *

    84. 

  84.      * @param string $binary

    85. 

  85.      * @return string

    86. 

  86.      */

    87. 

  87.     public function fromBinary($binary) {

    88. 

  88.         return $this->_math->binaryToInteger($binary);

    89. 

  89.     }

    90. 

  90. 

    91. 

  91.     /**

    92. 

  92.      * Translate a big integer string into a binary form

    93. 

  93.      *

    94. 

  94.      * @param string $integer

    95. 

  95.      * @return string

    96. 

  96.      */

    97. 

  97.     public function toBinary($integer)

    98. 

  98.     {

    99. 

  99.         return $this->_math->integerToBinary($integer);

    100. 

  100.     }

    101. 

  101. 

    102. 

  102. }
    103.