[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. 

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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-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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