Question

Ok, so I’m trying to figure out how to go from hexadecimal encryption to string and back, but for some reason the when I encrypt, i’m not getting the same password that was passed in, but its close…weird right? I’m sure my syntax is wrong somewhere. Help?

Here’s a link to test a little random password. I’ve set ‘pw’ as the hexadecimal version and pass that in: view demo

$encoded  = (string)$_GET['pw'];  
$literals = explode(' ', wordwrap($encoded, 2, ' ', 2));  
$password = '';  

for ($i = 0; $i < count($literals); $i++) {  
    $password .= chr(hexdec($literals[$i]) - $i);  
}

echo $password . '<br />';
print_r($literals) . '<br />';
$passarray = str_split($password);

echo '<pre>';
print_r($passarray);
echo '</pre>';

for($i = 0; $i < count($passarray); $i++) {
    $newpassword .= bin2hex($passarray[$i]);
}
echo $newpassword;

UPDATE:

.I’m actually not trying to “encrypt” for security per se…I’m actually trying to automate the creation of Dreamweaver Site Definition files and this is the “encryption” they use to semi-hide the password. I can do this already by copying the file and inserting different usernames, but I’d like to issue and new password each time as well. just FYI

Answer 1

Look closer at this line:

$password .= chr(hexdec($literals[$i]) - $i);

You’re decreasing the value by $i. So every increment, the value will be $literals[$i] - $i.

This is the reverse of the above:

$newpassword .= dechex(ord($passarray[$i]) + $i);