php使用3des加密的代码(兼容.net)

2. class Crypt3Des
3. {
4. private $key = "";
5. private $iv = "";
6. /**
7. * 构造，传递二个已经进行base64_encode的KEY与IV
8. *
9. * @param string $key
10. * @param string $iv
11. */
12. function __construct ($key, $iv)
13. {
14. if (empty($key) || empty($iv)) {
15. echo 'key and iv is not valid';
16. exit();
17. }
18. $this->key = $key;
19. $this->iv = $iv;
20. }
21. /**
22. *加密
23. * @param $value
24. * @return
25. */
26. public function encrypt ($value)
27. {
28. $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
29. $iv = base64_decode($this->iv);
30. $value = $this->PaddingPKCS7($value);
31. $key = base64_decode($this->key);
32. mcrypt_generic_init($td, $key, $iv);
33. $ret = base64_encode(mcrypt_generic($td, $value));
34. mcrypt_generic_deinit($td);
35. mcrypt_module_close($td);
36. return $ret;
37. }
38. /**
39. *解密
40. * @param $value
41. * @return
42. */
43. public function decrypt ($value)
44. {
45. $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
46. $iv = base64_decode($this->iv);
47. $key = base64_decode($this->key);
48. mcrypt_generic_init($td, $key, $iv);
49. $ret = trim(mdecrypt_generic($td, base64_decode($value)));
50. $ret = $this->UnPaddingPKCS7($ret);
51. mcrypt_generic_deinit($td);
52. mcrypt_module_close($td);
53. return $ret;
54. }
55. private function PaddingPKCS7 ($data)
56. {
57. $block_size = mcrypt_get_block_size('tripledes', 'cbc');
58. $padding_char = $block_size - (strlen($data) % $block_size);
59. $data .= str_repeat(chr($padding_char), $padding_char);
60. return $data;
61. }
62. private function UnPaddingPKCS7 ($text)
63. {
64. $pad = ord($text{strlen($text) - 1});
65. if ($pad > strlen($text)) {
66. return false;
67. }
68. if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
69. return false;
70. }
71. return substr($text, 0, - 1 * $pad);
72. }
73. }
74. ?>

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