[Cryptech Core] modexp optimization plans

[Joachim Strömbergson]

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Aloha!

Randy Bush wrote:
> i view needing an extra word for the result as the same as a double 
> entry bookkeeping error of one cent.  we know there is something
> wrong but we do not know the magnitude of the problem or the cause.
> it could be two complementary errors, one of $1,000.01 and one of
> ($1,000.00). it scares me and should, imiho, scare you.

It is MSB overflow in the last word only.


> i can pretend to understand.  but does verilog not give you nanguage 
> constucts so you do not have to rearrange everything manually?

To some degree. And when doing the change from 32->64 moving to
compile/build time generic word with is the way to do it. Places where
one needs to be careful is the API memory implementations and counters.
Moving from 64->128 or 64->256 should be fast.

- -- 
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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