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¿µÊ¢µÄ authcode º¯Êý¿ÉÒÔ˵¶ÔÖйúµÄPHP½ç×÷³öÁËÖØ´ó¹±Ïס£°üÀ¨¿µÊ¢×Ô¼ºµÄ²úÆ·£¬ÒÔ¼°´ó²¿·ÖÖйúʹÓÃPHPµÄ¹«Ë¾¶¼ÓÃÕâ¸öº¯Êý½øÐмÓÃÜ£¬authcode ÊÇʹÓÃÒì»òÔËËã½øÐмÓÃܺͽâÃÜ¡£
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Ãܳףº1110 0011
ÃÜÎÄ£º0100 1010
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Ãܳףº1110 0011
Ã÷ÎÄ£º1010 1001
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1.// ²ÎÊý½âÊÍ
2.// $string£º Ã÷ÎÄ »ò ÃÜÎÄ
3.// $operation£ºDECODE±íʾ½âÃÜ,ÆäËü±íʾ¼ÓÃÜ
4.// $key£º Ãܳ×
5.// $expiry£ºÃÜÎÄÓÐЧÆÚ
6.function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
7. // ¶¯Ì¬Ãܳ׳¤¶È£¬ÏàͬµÄÃ÷ÎÄ»áÉú³É²»Í¬ÃÜÎľÍÊÇÒÀ¿¿¶¯Ì¬Ãܳ×
8. $ckey_length = 4;
9.
10. // Ãܳ×
11. $key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
12.
13. // Ãܳ×a»á²ÎÓë¼Ó½âÃÜ
14. $keya = md5(substr($key, 0, 16));
15. // Ãܳ×b»áÓÃÀ´×öÊý¾ÝÍêÕûÐÔÑéÖ¤
16. $keyb = md5(substr($key, 16, 16));
17. // Ãܳ×cÓÃÓڱ仯Éú³ÉµÄÃÜÎÄ
18. $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
19. // ²ÎÓëÔËËãµÄÃܳ×
20. $cryptkey = $keya.md5($keya.$keyc);
21. $key_length = strlen($cryptkey);
22. // Ã÷ÎÄ£¬Ç°10λÓÃÀ´±£´æÊ±¼ä´Á£¬½âÃÜʱÑéÖ¤Êý¾ÝÓÐЧÐÔ£¬10µ½26λÓÃÀ´±£´æ$keyb(Ãܳ×b)£¬½âÃÜʱ»áͨ¹ýÕâ¸öÃܳ×ÑéÖ¤Êý¾ÝÍêÕûÐÔ
23. // Èç¹ûÊǽâÂëµÄ»°£¬»á´ÓµÚ$ckey_lengthλ¿ªÊ¼£¬ÒòΪÃÜÎÄǰ$ckey_lengthλ±£´æ ¶¯Ì¬Ãܳף¬ÒÔ±£Ö¤½âÃÜÕýÈ·
24. $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
25. $string_length = strlen($string);
26. $result = '';
27. $box = range(0, 255);
28. $rndkey = array();
29. // ²úÉúÃܳײ¾
30. for($i = 0; $i <= 255; $i++) {
31.


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