[Cryptech Tech] core size in cryptech.h

[Joachim Strömbergson]

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Aloha!

Павел Шатов wrote:
> Speaking of core sizes, as far as I remember, we wanted to have 
> different segments for different types of cores. All hashes can be
> in one segment and have the same size. ECDSA is a signature core, we
> can place it in a different segment, where all cores will have
> different size and so on.

Yes. And as long as we don't run out of address space in a segment I
think grouping cores makes sence. We have five out of eight possible
segments allocated so we do have a lot of headroom still. The globals
segment could probably be squeezed a bit if it starts getting cramped.
But for now I think we should just use what we have. As long as we can
have the core sizes a bit different for modexp, ecdsa for example.

We could also bikeshed a bit about if math is the best name for the
segmemt that supports rsa, ecdsa. I don't know how generic re curves
your core. But for modexp the name works.

One similar issue is cipher modes. Having things like ctr, gcm in
ciphers is straight forward. But should keywrap also be there. And for
keywrap I would appreciate thoughts from you, Rob, Paul and anyone else
how the use case should be.

Basically we want to be able to write read and write wrapped keys and
wrap/unwrap keys stored in RAM inside the FPGA. But we then would also
like to be able to send unwrapped keys to the other cores (or have them
read from a common key memory.) (Having the CPU transfer the unwrapped
keys would make the wrapping rather meaningless ;-)

This might mean that we need to add an internal top level controller/DMA
unit (which could have addresses in the globals.) inside the FPHA. The
controller can perform read/writes on the internal bus for us. Or some
other mechanism. Thie controller would then also be able to access
addresses the CPU can't.



> Joachim, we really need to write down what cores we have right now.
> Can you update that memory map, that I created along with baseline
> project?

Sure. I will update the cryptech.h and the RTL with all cores (aes,
chacha are the main ones not in there). Where is the document in the repo?

- -- 
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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