Need help to reverse engineer checksum algorithm

[flamsk]

Hi there, i have some files which ends with 2 bytes of checksum. I need to find out which checksum algorithm that has been used.

File 1: - Checksum is 3038 in hex
ASCII "1221929508"

File 2: - Checksum is 6F97
ASCII "4"

File 3: - Checksum is 2DD5
ASCII
"<?xml version="1.0"?>
<!DOCTYPE ProxyList SYSTEM "proxylist.dtd">
<ProxyList>
<!-- Use no proxies by default -->
</ProxyList>
"

I know that the checksum in all files has been generatet with the same algorithm,
but which one ?

Please write if out have ideas to solve this.

best regards

[myhexhax]

Please consolidate your posts :[
http://www.hackthissite.org/forums/viewtopic.php?f=33&t=1881

Didn't I read this somewhere else?

Edit: Ah, here it is viewtopic.php?f=28&t=1883

(If people don't help you in one area, posting in more than one probably won't get you better results. You may want to check other forums, or perhaps do a little research.. as you've probably noticed, these forums aren't incredibly active, and your time would probably be spent elsewhere, (though I don't suggest abandoning that thread, as something may come of it, of course))