<?php
02
/*===========================================================
03
= 版權協議：
04
= GPL (The GNU GENERAL PUBLIC LICENSE Version 2, June 1991)
05
=------------------------------------------------------------
06
= 文件名稱：cls.sys_crypt.php
07
= 摘 要：php加密解密處理類
08
= 版 本：1.0
09
= 參 考：Discuz論壇的passport相關函數
10
=------------------------------------------------------------
11
= Script Written By PHPWMS項目組
12
= 最後更新：xinge
13
= 最後日期：2007-12-09
14
============================================================*/
15
16
class SysCrypt {
17
18
private $crypt_key;
19
20
// 構造函數
21
public function __construct($crypt_key) {
22
$this -> crypt_key = $crypt_key;
23
}
24
25
public function php_encrypt($txt) {
26
srand((double)microtime() * 1000000);
27
$encrypt_key = md5(rand(0,32000));
28
$ctr = 0;
29
$tmp = '';
30
for($i = 0;$i<strlen($txt);$i++) {
31
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
32
$tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
33
}
34
return base64_encode(self::__key($tmp,$this -> crypt_key));
35
}
36
37
public function php_decrypt($txt) {
38
$txt = self::__key(base64_decode($txt),$this -> crypt_key);
39
$tmp = '';
40
for($i = 0;$i < strlen($txt); $i++) {
41
$md5 = $txt[$i];
42
$tmp .= $txt[++$i] ^ $md5;
43
}
44
return $tmp;
45
}
46
47
private function __key($txt,$encrypt_key) {
48
$encrypt_key = md5($encrypt_key);
49
$ctr = 0;
50
$tmp = '';
51
for($i = 0; $i < strlen($txt); $i++) {
52
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
53
$tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
54
}
55
return $tmp;
56
}
57
58
public function __destruct() {
59
$this -> crypt_key = null;
60
}
61
}
62
63
64
$sc = new SysCrypt('phpwms');
65
$text = '110';
66
print($sc -> php_encrypt($text));
67
print('<br>');
68
print($sc -> php_decrypt($sc -> php_encrypt($text)));
69
?>
