linux-kernel - Re: [PATCH v2 3/4] secure_seq: use siphash24 instead of md5

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Date:   Wed, 14 Dec 2016 18:49:26 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Netdev <netdev@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Andi Kleen <ak@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] secure_seq: use siphash24 instead of md5_transform

On Wed, Dec 14, 2016 at 3:47 PM, David Laight <David.Laight@...lab.com> wrote:
> Just remove the __packed and ensure that the structure is 'nice'.
> This includes ensuring there is no 'tail padding'.
> In some cases you'll need to put the port number into a 32bit field.

I'd rather not. There's no point in wasting extra cycles on hashing
useless data, just for some particular syntactic improvement. __packed
__aligned(8) will do what we want perfectly, I think.

> I'd also require that the key be aligned.

Yep, I'll certainly do this for the siphash24_aligned version in the v3.