Roy, Anindya (Anindya) wrote:
-Original Message-
From: Neil Costigan
I have recently used it to work with the IBM Cell processor
I'd recommend the GMP engine as a starting point
any specific questions or issues ?
/Neil
Hi Neil,
Its good to know that I am not alone :). I don't understand
what is GMP engine ?
From my experience the the GMP engine (it is an interface to the GNU
multi-precision library) is the easiest starting point to take as a
working example.
Its software only and easy to follow to get the basics of the
interfaces, calling order and data structures etc.
The process is
- initialize,
- convert parameters to local 'big number' representation,
- process,
- convert results back to openssl bn format
- clean up.
however your problem is a bit more advanced as you are dealing with
hardware.
If I remember rightly If you look through the engine samples you'll see
one or two more examples with similar IOCTL requirements
Basically, I am trying to interface with the Freescale MPC8555. The
crypto driver expects each crypto request be invoked as a ioctl
callback, where the crypto request is passed as a driver specific
structure pointer. Since the openssl engine does not provide any
interface to do this, this makes me think that I have to write the
mapping of the openssl crypto api's to its equivalent ioctl call.
Did you also have to write a similar mapping to make it driver
compatible ?
I think you have guessed correctly.
my problems was not exactly the same but I think the process was similar.
I had to map the openssl engine calls to Cell SPU thread calls and
organize DMA transfers of the parameters.
See how you can use the (RSA_CTX?) engine data structures to pass
pointers to your own data structures from the initializations through
the various calls to clean-up.
have a look at the GMP engine for an example of this
So I was wondering if you could kindly share how to best use the Engine
interface.
if it is of any help
I have a preprint of my work on the Cryptology ePrint Archive
http://eprint.iacr.org/2007/061
good luck with it and let us know how you get on.
/Neil
Anindya
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