【網路安全實務與社會實踐】作業一#

1
<?php
2
include('flag.php');
3

4
$A = $_GET['A'];
5
$B = $_GET['B'];
6

7
highlight_file(__FILE__);
8
echo '<hr>';
9

10
if (isset($A) && isset($B))
11
    if ($A != $B)
12
        if (strcmp($A, $B) == 0)
13
            if (md5($A) == md5($B))
14
                echo $flag;
15
            else die('ERROR: MD5(A) != MD5(B)');
16
        else die('ERROR: strcmp(A, B) != 0');
17
    else die('ERROR: A == B');
18
else die('ERROR: A, B should be given');