Xref: utzoo comp.protocols.tcp-ip:7655 comp.protocols.misc:616
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!think!cayman!brad
From: brad@cayman.COM (Brad Parker)
Newsgroups: comp.protocols.tcp-ip,comp.protocols.misc
Subject: CRC calc for Ethernet; How?
Keywords: CRC Ethernet
Message-ID: <3371@cayman.COM>
Date: 12 Jul 89 03:05:45 GMT
Followup-To: poster
Organization: Cayman Systems Inc., Cambridge Ma
Lines: 18

I need a simple way to calculate the CRC used in Ethernet packets.
This is (from what I can see) using the "AUTODON II" polynomial.

I found some nice pictures in the Ethernet spec blue book, but
they assume a bit stream (and seem easy to implement if you are
doing VLSI, but not C code!)

Anyone have a hints for a some way to do this in C? I do not need
speed, just a correct algorithm. I assume there are some tricks
which can be exploited for 8 or 16 (or even 32) bit computation
machines.

thanks
-brad
-- 

Brad Parker
Cayman Systems, Inc.		Cambridge, Ma.			brad@cayman.com