linux-kernel - Re: [PATCH v2 02/10] crypto: AF_ALG: user space interface for cipher info

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Date:	Thu, 20 Nov 2014 08:05:52 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Stephan Mueller <smueller@...onox.de>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	Daniel Borkmann <dborkman@...hat.com>,
	<quentin.gouchet@...il.com>, LKML <linux-kernel@...r.kernel.org>,
	<linux-crypto@...r.kernel.org>, ABI/API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 02/10] crypto: AF_ALG: user space interface for cipher
 info

On Thu, Nov 20, 2014 at 05:03:24AM +0100, Stephan Mueller wrote:
> Am Dienstag, 18. November 2014, 22:08:23 schrieb Herbert Xu:
> 
> Hi Herbert, Steffen,
> 
> > 
> > We already have crypto_user so you should be extending that to
> > cover what's missing.
> 
> After playing a bit with the interface, I think it falls short supporting 
> AF_ALG in the following way:
> 
> crypto_user cannot be applied to the currently active cipher that one has open 
> with AF_ALG. For getting information, one has to call crypto_user with the 
> cra_driver_name of a cipher. (Why is that limitation, btw (see crypto_report 
> and the use of cru_driver_name?)

crypto_report() was intended to provide informations of one implementation
of a algorithm, so it was required to specify this algorithm exactly with
cru_driver_name.

We could extend crypto_report() to provide informations of the algorithm
with the highest priority that matches cra_name.

Or, we also have crypto_dump_report(). This basically provides informations
on all instantiated algorithms, similar to /proc/crypto. We could extend
this in a way that you can provide a cra_name. Then it can dump out the
informations of all algorithms that match cra_name.

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