About import/export.
The problem with HW is that it always handles 64 byte blocks except last
one.
So until finup/final it is not known if it is the last data. So some
buffer is kept in context.
With DMA it is very inefficient to have small buffer.
I use page 4k for that.
So after a certain update there is a data in the cache.
Doing export means that we need to get out intermediate hash and that
buffer.
Any suggestion?
Thanks
On 13/04/10 17:48, ext Herbert Xu wrote:
On Tue, Apr 13, 2010 at 04:44:35PM +0300, Dmitry Kasatkin wrote:
Well it can... if reqa occupied hw all other requests will fallback to
sw sha1.
That is unacceptable. If we had a user-space API that would
mean a single request can tie up the hardware indefinitely.
If your hardware is not able to produce a non-finalised hash,
then you should only do finup/final in hardware, and use a software
fallback to implement the rest.
If your hardware is also not able to accept an initial state,
then the only thing you can implement is digest. The rest would
have to fall back to software.
Cheers,
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