[Cryptech Tech] new Novena I2C interface

[Joachim Strömbergson]

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Aloha!

Great work! I will start working on the Novena more actively now that
the TRNG seems to work so using your new i2c if will be a good start.

I will also look at the EIM code. Have you checked in the EIM baseline
in Cryptech so we can do cleanup and adaptations?

Yours
JoachimS

Paul Selkirk wrote:
> I just committed a new version of the Novena I2C interface. I
> actually finished it last week, but have been letting it ripen (not
> unlike surströmming).
> 
> Instead of sending commands to write 4 bytes at a time, you simply 
> write() 64 bytes or 128 bytes of block data, and read() the digest.
> All the init/next/ready/valid signalling is handled internally. Each
> hash core is a separate virtual I2C device, including the variations
> on SHA-512.
> 
> Repeated writes to the same SHA core will be added to the same
> digest; the act of reading the digest resets the internal state, so
> that the next write will start a new digest.
> 
> I also added a generic file-hashing utility to both versions of the 
> Novena project, so we can make some speed comparisons. The "simple" 
> version is 6.5 times faster than the "classic" version, because it
> skips the overhead of the command/response system, and starts hashing
> as soon as all block data are present. The hash.c app is also about
> half the size in the "simple" version.
> 
> In the long term, we still want to be using EIM (which I've been
> banging my head against), but this gives us another tool in the
> toolbox.
> 
> paul _______________________________________________ Tech mailing
> list Tech at cryptech.is https://lists.cryptech.is/listinfo/tech


- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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