Re: [Ocf-linux-users] hardware acceleration question

[David M. <Dav...@se...>]

Jivin Max lays it down ...
> Hello.
> 
> After additional investigation it appeared that cryptotest choose wrong
> crypto_driver: after manually changing crypto_newsession() in crypto.c
> as follows:
> for (hid = 1; hid < crypto_drivers_num; hid++)...
> // note that hid is starting with 1 - that's where desired driver was 
> // registered
> I was able to run cryptotest on aes-7108 driver (only once however -
> after that /dev/crypto also disappeared).
> Unfortunately results were bad: I got "decrypt mismatch" error.

Ok that is the bug.

Attached is an older version that may still work for your kernel but fix
this problem.

> The next question is - what is the "iv" parameter printed by cryptotest?

http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation

> In order to clarify situation a bit I'd like to use reference aes
> implementation and to do so I need to get cleartext, cyphertext and key.
> That's pretty obvious except where is the key in cryptotest operations?

Load the cryptosoft driver instead of the aes-7108 driver.

Run cryptotest -v -a aes

That should get you the cleartext and cipher text.

To make it consistent, change the rdigit in cryptotest.c function to
return fixed values (there is an ifdef).

Cheers
Davidm

-- 
David McCullough,  dav...@se...,  Ph:+61 734352815
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