<?php

define('PART', 1); // 1 or 2

$pos = 0;
$skip = 0;
$list = range(0, 255);
$size = count($list);
$run = 0;

// $input = '1,2,3';
$input = '83,0,193,1,254,237,187,40,88,27,2,255,149,29,42,100';

if(PART == 1)
{
	foreach(explode(',', $input) as $length)
	{
		$length = intval($length);

		$indices = array();
		for($i = 0; $i < $length; $i += 1)
		{
			$indices[] = ($pos + $i) % $size;
		}

		$reversed = array();
		foreach($indices as $idx)
		{
			$reversed[] = $list[$idx];
		}
		$reversed = array_reverse($reversed);

		foreach($indices as $i => $idx)
		{
			$list[$idx] = $reversed[$i];
		}

		$pos = ($pos + $length + $skip) % $size;
		$skip += 1;
	}

	echo $list[0].' x '.$list[1].' = '.$list[0] * $list[1]."\r\n";
}
else
{
	$actual_input = array();
	foreach(str_split($input) as $char)
	{
		$actual_input[] = ord($char);
	}
	$actual_input = array_merge($actual_input, array(17, 31, 73, 47, 23));

	while($run < 64)
	{
		foreach($actual_input as $length)
		{
			$length = intval($length);

			$indices = array();
			for($i = 0; $i < $length; $i += 1)
			{
				$indices[] = ($pos + $i) % $size;
			}

			$reversed = array();
			foreach($indices as $idx)
			{
				$reversed[] = $list[$idx];
			}
			$reversed = array_reverse($reversed);

			foreach($indices as $i => $idx)
			{
				$list[$idx] = $reversed[$i];
			}

			$pos = ($pos + $length + $skip) % $size;
			$skip += 1;
		}

		$run += 1;
	}

	$dense = array();
	foreach(array_chunk($list, 16) as $part)
	{
		$result = 0;
		foreach($part as $number)
		{
			$result ^= $number;
		}
		$dense[] = $result;
	}

	$output = '';
	foreach($dense as $d)
	{
		$output .= dechex($d);
	}

	echo 'Result: '.$output."\r\n";
}

?>