From: Steffen Klassert <steffen.klassert@secunet.com>
To: Chaoxing Lin <Chaoxing.Lin@ultra-3eti.com>
Cc: "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
Horia Geanta <horia.geanta@freescale.com>
Subject: Re: authencesn compatibility problemn between software crypto and talitos driver
Date: Mon, 11 Mar 2013 08:15:18 +0100 [thread overview]
Message-ID: <20130311071518.GD21448@secunet.com> (raw)
In-Reply-To: <BD54DDEB2546894FAB0731EA7B0EDF8D07C583E5@RockMX01.rock.corp>
Ccing Horia Geanta, he did the esn implementation for talitos.
On Fri, Mar 08, 2013 at 03:27:48PM +0000, Chaoxing Lin wrote:
> 1. Can any one point me which RFC describe how exactly authencesn should work?
>
The ESN algorithm is described in RFC 4303 IP Encapsulating Security
Payload (ESP).
> 2. I test Ipsec with "esp=aes256-sha512-esn!" options and found compatibility issue between kernel software crypto and talitos driver.
> Talitos <---->talitos Good
> Soft crypto<---->soft crypto Good
> Soft crypto<---->talitos link established but no traffic can pass through.
>
> 3. Looking at source code of latest stable kernel 3.8.2, I found that these two implementations don't agree on what's to be hashed in ESN case.
> Talitos driver is more intuitive in that "assoc (SPI, SN-hi, SN-low) + IV + payload" are hashed.
The ESN implementation of the talitos driver looks rather scary,
it just renames authenc to authencesn in talitos_probe(). The
algorithm pretends to be authencesn but still does authenc, of course.
authencesn has to be implemented, it is not sufficient to change
the name, really.
> Kernel software crypto is counter-intuitive in that "hsg(SPI, SN-low) + sg(IV + payload) + tsg(SN-hi" are hashed.
This might look counterintuitive, but that's what RFC 4303 describes
for ESN if separate encryption and integrity algorithms are used.
next prev parent reply other threads:[~2013-03-11 7:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 15:27 authencesn compatibility problemn between software crypto and talitos driver Chaoxing Lin
2013-03-11 7:15 ` Steffen Klassert [this message]
2013-03-12 17:04 ` Horia Geantă
2013-03-12 20:57 ` Chaoxing Lin
2013-03-14 10:21 ` Horia Geantă
2013-03-14 23:34 ` Kim Phillips
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