#! /usr/bin/php
<?php

// argv[1] - bin file
// argv[2] - output file
// argv[3] - serial number

$data = file_get_contents($argv[1]);

if ($argc > 3) {
    $serialNumber = pack("a16", $argv[3]);
} else {
    $serialNumber = $data[108];
    $serialNumber = strtoupper($serialNumber);
    $serialNumber = $serialNumber . date("ymdHis");
}

$max = 16;
if (strlen($serialNumber) < 16) {
    $max = strlen($serialNumber);
}
for ($i = 0; $i < $max; $i++) {
    $data[$i + 42] = $serialNumber[$i];
}

// $data[108] . $data[109] are the "key id" used to sign
$vid = "FPP" . $serialNumber . $data[108] . $data[109];
$vid = base64_encode(md5( $vid, true));
for ($i = 0; $i < 22; $i++) {
    $data[$i + 78] = $vid[$i];
}
$vid = substr($vid, 0, 22);
$serialNumber = trim($serialNumber);
echo "SN: " . $serialNumber . "   Key: " . $vid . "\n";

file_put_contents($argv[2], $data);

$txt = $argv[1] . "\t" . $serialNumber . "\t" . $vid;
file_put_contents('serialNumbers.txt', $txt.PHP_EOL , FILE_APPEND | LOCK_EX);
?>