[Cryptech Core] meeting 28th and 29th

[Joachim Strömbergson]

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Aloha!

Rob Austein wrote:
> To put a bit more of a conceptual framework around this: sha1_core.v 
> is part of the portable core code, while the other stuff is part of 
> what we used to call the "Board Support Package" (BSP).

Yes, a working analogy. Or having (for example) an Ethernet card
connected via PCI vs ISA vs USB. The Ethernet functionality is the same,
but the system interface can be quite different.


> The point of all this is just that it may be a useful concept to
> keep in mind when structuring our repositories and thinking about
> APIs.

Exactly. Right now the cores have a register based 32-bit data
interface. Performing a SHA-256 operation requires writing the current
block to several different registers followed by writing to a control
register. Getting the digest out requires reading from several other
registers.

Furthermore coretest multiplexes these register accesses over a UART.
And Paul will multiplex them over I2C between the CPU and the cores.

For a simple MCU (A Raspberry Pi or an Arduino for example) connected to
a FPGA device, having register based access might be the right thing.
With Novena we might instead use memory mapping and more complex data
structures to allow more efficient SW and HW and thus better performance.

- -- 
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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