linux-kernel - Re: [PATCH 1/2] crypto: export crypto_alg

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Message-ID: <20150813073031.GC13352@js1304-P5Q-DELUXE>
Date:	Thu, 13 Aug 2015 16:30:31 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>
Subject: Re: [PATCH 1/2] crypto: export crypto_alg_list and rwsem

On Thu, Aug 13, 2015 at 02:38:23PM +0800, Herbert Xu wrote:
> On Thu, Aug 13, 2015 at 03:37:55PM +0900, Joonsoo Kim wrote:
> >
> > Is there any way to access netlink interface and get the output from
> > kernel-side? I'd like to show information through
> > "/sys/block/zramX/comp_algorithm", because some user program can be
> > broken if we change output of userspace exposed interface.
> 
> You could simply deprecate that interface but keep it for existing
> algorithms.  Any new algorithms can then be queried through the
> crypto_user interface.
> 
> The other option is to have a defined list of algorithms which is
> independent of the crypto API.  For example, have a look at what
> IPsec does in net/xfrm/xfrm_algo.c.  IPsec needs its own list
> because they come with annotations.

Hmm... they looks suboptimal.

How about introducing new functions to search supported algorithm in
kernel-side? As crypto API is used in more places, this interface
would be requested more. Defined list weaken the advantage of strong
point of generic crypto API.

Thanks.
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