>I've come across 2 CRCs so far - a 32 bit one used on the Class A cards,
>and a 16 bit one used on the Class B cards. I've tried a standard crc32
>routine (stolen from ssh), but it doesn't match the CRC reported by the
>router. Is there anyone good at understanding CRC routines who can help me
>reverse-engineer the cisco CRC, or perhaps does someone have some inside
>information they would like to share?
After some suggestions from various people, I tried uploading a few test
files onto a Cisco and seeing how the CRCs worked out. It turns out it's
not a true CRC at all, but rather a variation on the TCP checksum
algorithm.
>Please don't ask me for the code yet! I'll let the list know when it's
>available...
v0.1 of the code is now available (read only at the moment):
ftp://ftp.bbc.co.uk/pub/ciscoflash/
Enjoy,
Simon
-- Simon Lockhart | Tel: +44 (0)1737 839676 Internet Engineering Manager | Fax: +44 (0)1737 839516 BBC Internet Services | Email: Simon.Lockhart@bbc.co.uk Kingswood Warren,Tadworth,Surrey,UK | URL: http://support.bbc.co.uk/
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