[Cryptech Tech] Cleanup of chacha

[Joachim Strömbergson]

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Aloha!

I've just merged a cleaned up version of the chacha core to Cryptech.
The API has not changed (besides bumping version minor from 80 to 81),
but the code is substantially more compact.

The major behavioral change is that while the core includes four QR
modules, the way they were used they really didn't work in parallel
which meant that performance was much lower that what it should be. For
Cryptech this means that random number generation (and thus key
generation etc) should see improved performance.

Implementation wise, the API address logic has been simplified.
Registers for key and data has also been changed syntax wise to use
Verilog two dimensional arrays. All tools (simulators, synthesis/build
tools) I have access to including ISE, ModelSim, Quartus parses this
correctly.

The _core previously sampled inputs into registers. These registers has
been removed which means that if _core is used without the top, the
caller must ensure that the inputs are stable.


- -- 
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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