linux-kernel - Re: [PATCH v3 1/3] siphash: add cryptographically secure hashtable function

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Message-ID: <alpine.DEB.2.20.99.1612171601430.31470@trent.utfs.org>
Date:   Sat, 17 Dec 2016 16:06:15 -0800 (PST)
From:   Christian Kujau <lists@...dbynature.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
cc:     Tom Herbert <tom@...bertland.com>, Netdev <netdev@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        "Daniel J . Bernstein" <djb@...yp.to>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH v3 1/3] siphash: add cryptographically secure hashtable
 function

On Thu, 15 Dec 2016, Jason A. Donenfeld wrote:
> > I'd still drop the "24" unless you really think we're going to have
> > multiple variants coming into the kernel.
> 
> Okay. I don't have a problem with this, unless anybody has some reason
> to the contrary.

What if the 2/4-round version falls and we need more rounds to withstand 
future cryptoanalysis? We'd then have siphash_ and siphash48_ functions, 
no? My amateurish bike-shedding argument would be "let's keep the 24 then" :-)

C.
-- 
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Chewing gum on /dev/sd3c