You should probably check this page:
http://www.brouhaha.com/~eric/crypto/
 
Peter van Hoof

Philip Pemberton philpem@dsl.pipex.com wrote:
 
> I'm toying with the idea of implementing SHA-1 on a PIC16F or PIC18F chip.
> Just out of curiosity, has anyone done this before?
> It looks like it'll need about 300 bytes of RAM, so that pretty much limits
> it to the higher-end chips, but in theory it should be doable...

> What about other crypto/hash algorithms - I'm thinking along the lines of
> Skipjack, Blowfish, MD5, etc. Maybe even RSA?

> Thanks.
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