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<?php

$crc32_table = array_fill(0, 256, 0);
$POLY = 0xC00D3BAD; // you know the poly dude!!

function build_crc_tables() {
    global $crc32_table, $POLY;
    for ($i=0; $i < 256; $i++) {
        $fwd = $i;
        $j = 8;
        while ($j > 0) {
            if (($fwd & 1) == 1)
                $fwd = ($fwd >> 1) ^ $POLY;
            else
                $fwd >>= 1;
            $crc32_table[$i] = $fwd;
            $j--;
        }
    }
}

function custom_crc($s) {
	global $crc32_table;
	$crc = 0xffffffff;
	foreach (str_split($s) as $v) {
		$crc = ($crc >> 8) ^ $crc32_table[$crc & 0xff ^ ord($v)];
	}
	return $crc ^ 0xffffffff;
}

function digest($crc) {
	return dechex($crc);
}
build_crc_tables();
?>