1. function dsetcookie($var, $value, $life = 0, $prefix = 1) {
2. global $cookiedomain, $cookiepath, $addtime, $_server;
3. setcookie($var, $value,$life ? $addtime + $life : 0, $cookiepath,$cookiedomain, $_server['server_port'] == 443 ? 1 : 0);
4. }
5. function authcode($string, $operation = 'decode', $key = '', $expiry = 0) {
6. global $webaddr;
7. $auth_key=md5($webaddr);
8. $ckey_length = 4;
9. $key = md5($key ? $key : $auth_key);
10. $keya = md5(substr($key, 0, 16));
11. $keyb = md5(substr($key, 16, 16));
12. $keyc = $ckey_length ? ($operation == 'decode' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
13. $cryptkey = $keya.md5($keya.$keyc);
14. $key_length = strlen($cryptkey);
15. $string = $operation == 'decode' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
16. $string_length = strlen($string);
17. $result = '';
18. $box = range(0, 255);
19. $rndkey = array();
20. for($i = 0; $i <= 255; $i++) {
21. $rndkey[$i] = ord($cryptkey[$i % $key_length]);
22. }
23. for($j = $i = 0; $i < 256; $i++) {
24. $j = ($j + $box[$i] + $rndkey[$i]) % 256;
25. $tmp = $box[$i];
26. $box[$i] = $box[$j];
27. $box[$j] = $tmp;
28. }
29. for($a = $j = $i = 0; $i < $string_length; $i++) {
30. $a = ($a + 1) % 256;
31. $j = ($j + $box[$a]) % 256;
32. $tmp = $box[$a];
33. $box[$a] = $box[$j];
34. $box[$j] = $tmp;
35. $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
36. }
37. if($operation == 'decode') {
38. if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {//开源代码phpfensi.com
39. return substr($result, 26);
40. } else {
41. return '';
42. }
43. } else {
44. return $keyc.str_replace('=', '', base64_encode($result));
45. }
46. }