[Cryptech Tech] Updated sha256 core - now much more compact, better performance.

[Joachim Strömbergson]

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Aloha!

I've done an update of the sha256 core that quite drastically changed
the implementation results. The W memory is now based on a 16 word
sliding window. This cut down the logic resources by 2.5x and number of
registers by 1.8x. The design also reaches a few MHz better performance.
The testbenches has been updated in accordance with the design change.

If you were doing any testing or auditing of the sha256 core, please
pull the new version and use that one. It is much better.

(The sha1 core will get a similar face-lift today or so.)

- -- 
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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