UCenter authcode 解密
首先 只要$key正确 Discuz的authcode加密是可逆的
以X31为例 登录成功时
dsetcookie('auth', authcode("{$member['password']}\t{$member['uid']}", 'ENCODE'), $cookietime, 1, true);
此处省略了参数$key 则默认使用$_G['authkey']
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
$ckey_length = 4;
$key = md5($key != '' ? $key : getglobal('authkey'));
$_G['authkey']在哪？source/class/discuz/discuz_application
$this->var['authkey'] = md5($this->var['config']['security']['authkey'].$this->var['cookie']['saltkey']);
如果想在外部解密这个串 写上Discuz里取得的authkey就O了
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