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Anyway to reverse this?

Code:

function hex2bin($data) {

     $len = strlen($data);

     return pack("H" . $len, $data); 

} 



function check_key($input){

    $iv = "qe3jigneqfrgnqw2egfmas4qetjkn5lg";

    $key = "589752d5b0f4217747bd721111be9057"; 

    $text = hex2bin($input);

    $domain = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);

    echo $input. '<br/>' .$domain;

}

What do you mean by reverse? Are you talking about an algorithmic reversal or the possibility of reverse engineering?

For an algorithmic reversal, the reverse would be taking the output contained in $domain, running it through mcrypt_encrypt() using the same key, IV, and mode, then running the output from that through a bin2hex function.

As for reverse engineering, you have no worries about anything provided your key and IV are secure.

PHP Code:


		
			
<?

function hex2bin($data) {
     $len = strlen($data);
     return pack("H" . $len, $data); 
} 

function bin2hex2($data) {
     return unpack("H*",$data);
}

function check_key($input){
    $iv = "qe3jigneqfrgnqw2egfmas4qetjkn5lg";
    $key = "589752d5b0f4217747bd721111be9057"; 
    $text = hex2bin($input);
    $domain = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
    return $domain;
}

function make_key($input)    {
    $iv = "qe3jigneqfrgnqw2egfmas4qetjkn5lg";
    $key = "589752d5b0f4217747bd721111be9057"; 
    $domain = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $input, MCRYPT_MODE_ECB, $iv);
    $key = bin2hex2($domain);
    return $key[1];
}


$key = make_key($_REQUEST['domain']);
echo "Key is ".$key."<br /><br />\n\n";
echo "Decode Check: ".check_key($key);


?>

page.php?domain=test.com