[Cryptech Core] New version of chacha

[Joachim Strömbergson]

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Aloha!

As part of a side project to implement a complete core for the
chacha20-poly1305 aead cipher according to RFC 7539 I have done some
quite substantial cleanup and rework of the chacha core. The core uses
less logic resources, about half the number of registers and can be
clocked 10% faster. There are no API changes and the core (naturally)
generates the same results for the given test vectors in the testbenches.

I'm thinking of merging the updates core into cryptech. Sounds ok?

- -- 
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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