参考discuz的passpor写的php加密解密处理类

2. /*---------------------------------------
3. = 版权协议：
4. = GPL (The GNU GENERAL PUBLIC LICENSE Version 2, June 1991)
5. =------------------------------------------------------------
6. = 文件名称：cls.sys_crypt.php
7. = 摘 要：php加密解密处理类
8. = 版 本：1.0
9. = 参 考：Discuz论坛的passport相关函数
10. =------------------------------------------------------------
11. = Script Written By PHPWMS项目组
12. = 最后更新：xinge
13. = 最后日期：2007-12-09
14. ---------------------------------------=*/
16. class SysCrypt {
17. private $crypt_key;
19. // 构造函数
20. public function __construct($crypt_key) {
21. $this -> crypt_key = $crypt_key;
22. }
24. public function php_encrypt($txt) {
25. srand((double)microtime() * 1000000);
26. $encrypt_key = md5(rand(0,32000));
27. $ctr = 0;
28. $tmp = '';
29. for($i = 0;$i $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
30. $tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
31. }
32. return base64_encode(self::__key($tmp,$this -> crypt_key));
33. }
35. public function php_decrypt($txt) {
36. $txt = self::__key(base64_decode($txt),$this -> crypt_key);
37. $tmp = '';
38. for($i = 0;$i $md5 = $txt[$i];
39. $tmp .= $txt[++$i] ^ $md5;
40. }
41. return $tmp;
42. }
44. private function __key($txt,$encrypt_key) {
45. $encrypt_key = md5($encrypt_key);
46. $ctr = 0;
47. $tmp = '';
48. for($i = 0; $i $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
49. $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
50. }
51. return $tmp;
52. }
54. public function __destruct() {
55. $this -> crypt_key = null;
56. }
57. }
59. #--调用示例
60. $sc = new SysCrypt('phpwms');
61. $text = '110';
62. print($sc -> php_encrypt($text));
63. print('
    ');
64. print($sc -> php_decrypt($sc -> php_encrypt($text)));
65. ?>

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