What happend to aes586?

[Clemens Eisserer]

Hi,

I've recently switched to dmcrypt with aes cipher, which works quite well
except for beeing a little bit slow (~40mb/s read/write), where even weaker
CPUs in an old comparison I found yield ~60-80mb/s.

A few times AES586 is mentioned beeing a hand optimized assembler version of
the generic AES module, but I wasn't able to find it. Is it not part of the
Fedora15 default kernel, or has it been removed from vanilla as well?

Thank you in advance, Clemens

[James Matthews]

You can find it here

http://www.opensource.apple.com/source/OpenSSL098/OpenSSL098-35/src/crypt...

It has it's asm inline but be wary of any encryption algo and always confirm
that it is the right thing (by comparing the bytes of other implementations.

)

James

On Sun, Jul 31, 2011 at 6:25 PM, Clemens Eisserer <linuxhippy(a)gmail.com&gt;wrote:

>  Hi,
>
>  I've recently switched to dmcrypt with aes cipher, which works quite well
>  except for beeing a little bit slow (~40mb/s read/write), where even weaker
>  CPUs in an old comparison I found yield ~60-80mb/s.
>
>  A few times AES586 is mentioned beeing a hand optimized assembler version
>  of the generic AES module, but I wasn't able to find it. Is it not part of
>  the Fedora15 default kernel, or has it been removed from vanilla as well?
>
>  Thank you in advance, Clemens
>
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[Bryn M. Reeves]

On 08/02/2011 02:49 AM, James Matthews wrote:
>  You can find it here
>  
>
> http://www.opensource.apple.com/source/OpenSSL098/OpenSSL098-35/src/crypt...
>  
>  It has it's asm inline but be wary of any encryption algo and always confirm 
>  that it is the right thing (by comparing the bytes of other implementations. 
Similar name but that's not the same thing - this is part of the OpenSSL project.

The module Clemens was asking about is a kernel module that provides
arch-specific acceleration for the in-kernel crypto API.

>  On Sun, Jul 31, 2011 at 6:25 PM, Clemens Eisserer
> <linuxhippy(a)gmail.com 
>      A few times AES586 is mentioned beeing a hand optimized assembler version of
>      the generic AES module, but I wasn't able to find it. Is it not part of the
>      Fedora15 default kernel, or has it been removed from vanilla as well? 
It was there as a module in the f15 GA i686 kernel package:

$ rpm -qlp /tmp/kernel-2.6.38.6-26.rc1.fc15.i686.rpm|grep aes-i586
/lib/modules/2.6.38.6-26.rc1.fc15.i686/kernel/arch/x86/crypto/aes-i586.ko

But the equivalent on x86_64 was a built-in:

$ grep AES_X86_64 /boot/config-2.6.38.8-35.fc15.x86_64
CONFIG_CRYPTO_AES_X86_64=y

This was changed in an f15 update:

* Wed Jun 15 2011 Kyle McMartin <kmcmartin(a)redhat.com&gt;
- Build in aesni-intel on i686 for symmetry with 64-bit.

So the functionality is still there, it's just not built as a module any more.

Regards,
Bryn.