On Tue, Oct 02, 2007 at 09:05:12PM +0200, Sebastian Siewior ([EMAIL PROTECTED])
wrote:
> >DES currently does not pass tcrypt's multipage test, since HIFN adapter
> >can not work with non-blocksize aligned chunks, although crypto alignmask
> >is set to 3, tcrypt provides a block of size 2 in its multipage test,
> >which fails.
> I recalled now that I forgot to point this out. You set the align mask to
> the block size of the algorithm but it is almost unused / useless.
> Let me explain:
> - it is ensured that the key you get (in the setkey function) is
> properly aligned. This doesn't matter in your case because you
> memcpy() the key away to your private struct.
> - your private struct is pointer aligned (if I remember correctly). You
> memcpy() your key away so it looks like you don't need the ctx
> aligned according to your mask (but it would be possible :))
> - the proper alignment of src, dst and the IV that you get is _not_
> ensured. This would be the case if you would develop a blkcipher and
> use blkcipher_walk_init(), blkcipher_walk_virt(), ....
>
> Now. If you pass your AES-tcrypt-test (where you need 16 bytes alignment)
> than this is pure luck. If you really need aligned src,dst or the IV
> than you have to do it by yourself :(
It has to be multiple of blocksize. I.e. it is impossible to
crypt one byte - hardware will stall, DES test provides two bytes as
input - this will not work. If that is going to be handled in driver,
then it will relocate. I'm not sure it is the right decision.
--
Evgeniy Polyakov
-
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
