[Cryptech Tech] EIM: mostly working

[Joachim Strömbergson]

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Aloha!

Paul Selkirk wrote:
> Given that all 3 of the hash cores produce correct digests for
> single and double block tests most of the time, I'm pretty confident
> in both of these things. But I think we're riding the edge of our
> timing tolerances, and it's biting us most often in the 1000-block
> test (while the other tests hash 18 blocks in total).

I've just gone through the main cores and implemented them for the
Spartan-6 device on the Novena. The Maxf you can get from them are:

ChaCha: 67 MHz
SHA-1: 100 MHz
SHA-256: 70 MHz
SHA-512: 57 MHz

This is a best case that allows ISE to do best effort implementation of
the core. This means that these cores will not be able to meet timing
when driven by a clock running at higher clock frequency. In fact, on
the Novena with a lot of pin constraints and other blocks fighting for
resources, the achievable clock frequency will be lower. A clock
frequency target of 50 MHz or even 33 MHz might be a good start.

- -- 
Med vänlig hälsning, Yours

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