[ucc] Vending machine authentication ideas?

[Bernard Blackham]

On Wed, Jun 23, 2004 at 09:30:01AM +1000, Mikolaj Habryn wrote:
> On Wed, 2004-06-23 at 05:23, Bernard Blackham wrote:
> > Can anybody suggest something suitable?
> 
> Send(Data):
> 	MIC = SHA-1(Data, Secret)
> 	Send(Data, MIC)

Thanks, but googling for a SHA1 implementation for the HC11 doesn't
show up much. Compiling a public domain implementation (stolen from
mppe sources) complains that the HC11 doesn't have enough registers
to cope. Soft registers on HC11 are still a little flaky. I could
spent time beating the implementation to be smarter, but is there an
lighter-weight option?

What other digests might be attainable?

Bernard.

-- 
 Bernard Blackham <bernard at blackham dot com dot au>