From owner-freebsd-hackers  Thu Jan 23 04:59:33 1997
Return-Path: <owner-hackers>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.5/8.8.5) id EAA17917
          for hackers-outgoing; Thu, 23 Jan 1997 04:59:33 -0800 (PST)
Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120])
          by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id EAA17912
          for <hackers@freebsd.org>; Thu, 23 Jan 1997 04:59:30 -0800 (PST)
Received: (from msmith@localhost) by genesis.atrad.adelaide.edu.au (8.8.2/8.7.3) id XAA21523 for hackers@freebsd.org; Thu, 23 Jan 1997 23:29:28 +1030 (CST)
From: Michael Smith <msmith@atrad.adelaide.edu.au>
Message-Id: <199701231259.XAA21523@genesis.atrad.adelaide.edu.au>
Subject: CRC-16 algorithms?
To: hackers@freebsd.org
Date: Thu, 23 Jan 1997 23:29:27 +1030 (CST)
X-Mailer: ELM [version 2.4ME+ PL28 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk


(Yes, this is FreeBSD-related 8)

I'm looking for any implementations of various CRC-16 polynomials; I'm
trying to compute a checksum for a parameter save area for a
peripheral, which is documented as "CRC-16", but no details of the
polynomial are given. 8(

If you're into cracking these sorts of things, here's the parameter space :

00000000  00 39 3c 3e 01 02 03 00  80 00 00 00 00 00 00 00  |.9<>............|
00000010  08 00 0e 20 3d 4b 00 00  00 00 00 00 00 02 01 00  |... =K..........|
00000020  01 03 00 de ad 01 00 00  00 00 00 00 00 00 00 01  |....-...........|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 01 26 3c aa  |.............&<.|

The bytes at 0x3d and 0x3e are the CRC-16 of the bytes from 0-0x3c
inclusive.  Any help here will help make the DOS configuration utility
for this device unnecessary, which would be nice 8)

-- 
]] Mike Smith, Software Engineer        msmith@gsoft.com.au             [[
]] Genesis Software                     genesis@gsoft.com.au            [[
]] High-speed data acquisition and      (GSM mobile)     0411-222-496   [[
]] realtime instrument control.         (ph)          +61-8-8267-3493   [[
]] Unix hardware collector.             "Where are your PEZ?" The Tick  [[