win7 product key decoder

decode-product-key.php

<?php

$str = <<<EOTXT

SUPER SECRET STUFF HERE

EOTXT;

$bin = Array();
$hex = Array();
$tmp = explode("\n", $str);
foreach ( $tmp as $s ) {
  if ( $s = trim($s) ) {
    $foo = explode(" ", $s);

    for ( $i = 3; $i < 20; $i++ ) {
      if ( $foo[$i] != "-" ) {
        $hex[] = $foo[$i];
        $bin[] = (int) hexdec($foo[$i]);
      }
    }
  }
}

var_dump(implode("", $hex));

$keyOffset = 52;
$i = 28;
$chars = "BCDFGHJKMPQRTVWXY2346789";
$kout = "";

do {
  $cur = 0;
  $x = 14;

  do {
    $tmp = $x + $keyOffset;

    $cur = $cur * 256;
    $cur = $bin[$tmp] + $cur;
    $bin[$tmp] = ($cur / 24) & 255;
    $cur = $cur % 24;
    $x--;
  } while ( $x >= 0 );

  $i--;

  $tmp = substr($chars, $cur, 1);
  $kout = "{$tmp}{$kout}";
  if ( ((29 - $i) % 6 == 0) && ($i != -1) ) {
    $i--;
    $kout = "-{$kout}";
  }

} while ( $i >= 0 );

var_dump($kout);