[dm-crypt] why nbytes for block cipher encrypt/decrypt is only 512 bytes

Rodel Miguel rodelfmiguel at gmail.com
Fri Apr 20 12:55:53 CEST 2012


Hi Arno , thanks for the reply. What if I trick the system to have block
size of say 128 instead of the default 16 for my AES driver? Do you know
what the side effect could be?

Thanks!
On Apr 20, 2012 6:23 PM, "Arno Wagner" <arno at wagner.name> wrote:

> I think you cannot. As long as the block-size for the IV scheme
> is 512 bytes, you are stuck with encrypting 512 bytes at a time,
> as they have their own IV.
>
> Arno
>
>
> On Fri, Apr 20, 2012 at 05:28:54PM +0800, Rodel Miguel wrote:
> > Hi,
> >
> > I am implementing a hardware encryption driver but I am having some
> > performance issues.  One of the areas of performance improvement that I
> am
> > thinking is to increase the number of bytes (unsigned int nbytes) that my
> > block cipher driver's encrypt/decrypt function gets; from 512 to 4096
> > bytes.  My hardware can be maximized to 4kbytes.  Do you have any
> > suggestions how I can maximize the en/decrypt performance by getting more
> > than 512 bytes of data every time the block cipher's encrypt/decrypt is
> > called?
> >
> > Thank you very much for your help!
> >
> > Kind Regards,
> > Rodel
>
> > _______________________________________________
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> > dm-crypt at saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt
>
>
> --
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email:
> arno at wagner.name
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> 338F
> ----
> One of the painful things about our time is that those who feel certainty
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