[Cryptech Tech] trng ready for play

[Joachim Strömbergson]

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Aloha!

The working trng is now in the repo and ready for testing. This version
of the trng includes:

- - A debug port that can extract the output from entropy sources as well
as the csprng. Which of them are source can be controlled via the API.
Also the update rate of the debug port can be controlled. Mainly used as
blinkenlights to be able to see that things are alive. Yes the port
leaks info and should be disabled or even removed in future versions.

- - Entropy timeout. Since we are using strict round robin policy between
the entropy providers, the collector could potentially hang waiting for
entropy from a provider that is enabled (and thus should deliver entropy
to the collector). The entropy timout function removes the livelock
situation by forcing the collector to move to the next entropy source.

Since each entropy provider must supply several words of entropy until
the seed can be generated, the timeout can happen several times.

I have recorded a video where I show how fast complete reseed takes with
both entropy providers running (parts of a second). I then pull the wire
to the avalanche noise board and starts a new reseed. This time the
timeout comes into use and reseed takes several seconds. Reconnecting
the wire again and reseed once more goes really fast.

The actual timeout time can be set via API. The default value is 1.6
seconds.

Thanks to Randy for pointing out the need for the timeout functionality.

BTW: If there in an interest I could upload the video somewhere
(suggestions welcome). It is 160 MBytes. The plot isn't very contrived
and no animals was hurt during filming.

- -- 
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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