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

Arno Wagner arno at wagner.name
Fri Apr 20 12:22:44 CEST 2012

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. 


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

> _______________________________________________
> dm-crypt mailing list
> 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 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
One of the painful things about our time is that those who feel certainty 
are stupid, and those with any imagination and understanding are filled 
with doubt and indecision. -- Bertrand Russell 

More information about the dm-crypt mailing list