Re: [PATCH v3 4/7] crypto: AF_ALG: add AEAD support

[Stephan Mueller <smueller-T9tCv8IpfcWELgA04lAiVw@public.gmane.org>]

Am Dienstag, 25. November 2014, 22:58:50 schrieb Herbert Xu:

Hi Herbert,

>On Mon, Nov 24, 2014 at 03:58:34PM +0100, Stephan Mueller wrote:
>> Ok. But in the code you see that skcipher is a 100% subset of AEAD.
>> For AEAD, all we need to do in addition to normal symmetric ciphers
>> is to select the AEAD kernel crypto API calls, to locate and use the
>> AD and to ensure we have the right memory size to process the tag.
>
>There is still one fundamental difference between AEAD and ciphers.
>Namely that ciphers can operate as you go while AEAD requests must
>be done in one lot.  So that should make the AEAD code simpler vs.
>ciphers.

Yes, that is a key difference.
>
>I think the best course of action for now is to start with sharing
>no code and then chop bits off as we see fit.

Ok, I will create a new patch set with a separate algif_aead.c. I guess 
the entire sgl handling logic will be gone in AEAD.
>
>Cheers,


Ciao
Stephan