[Cryptech Tech] ChaCha now in Cryptech

[Joachim Strömbergson]

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Aloha!

As a preparation for the upcoming TRNG core have I just added the ChaCha
stream cipher core to Cryptech. This version of ChaCha allows setting of
the initial value of the block counter to a given number. This will be
used in the TRNG design.

The top level wrapper, which is also included in the chacha core source
files sets the initial value hard to all zero which makes the cipher
conform to known tests. This means that the ChaCha core is not specific
to the TRNG core, but can be used in any HW application that needs it.

Finally there is a Python model included.

- -- 
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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