Philip Pemberton wrote:

>Hi,
>  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...
>  
>
The problem is that actually several buffers are needed, as well as 
lotsa code space
making it ALMOST impossible on PIC16, unless you use an external SPI 
EEROM Memory
arrayed as 32Kx8, and have plenty of buffer space.

>  What about other crypto/hash algorithms - I'm thinking along the lines of
>Skipjack, Blowfish, MD5, etc. Maybe even RSA?
>  
>
Are you sure you need this much security? Couldn't a scrambling 
algorithm work OK, as
long as you have good security for the algorithm itself?

--Bob


>Thanks.
>  
>


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