linux-kernel - Re: [kernel-hardening] Re: [PATCH v5 1/4] siphash: add cryptographically secure PRF

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Message-ID: <1481921067.1054.6.camel@gmail.com>
Date:   Fri, 16 Dec 2016 15:44:27 -0500
From:   Daniel Micay <danielmicay@...il.com>
To:     kernel-hardening@...ts.openwall.com,
        "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        George Spelvin <linux@...encehorizons.net>,
        Andi Kleen <ak@...ux.intel.com>,
        David Miller <davem@...emloft.net>,
        David Laight <David.Laight@...lab.com>,
        Eric Biggers <ebiggers3@...il.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Netdev <netdev@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Theodore Ts'o <tytso@....edu>, vegard.nossum@...il.com,
        "Daniel J . Bernstein" <djb@...yp.to>
Subject: Re: [kernel-hardening] Re: [PATCH v5 1/4] siphash: add
 cryptographically secure PRF

On Fri, 2016-12-16 at 11:47 -0800, Tom Herbert wrote:
> 
> That's about 3x of jhash speed (7 nsecs). So that might closer
> to a more palatable replacement for jhash. Do we lose any security
> advantages with halfsiphash?

Have you tested a lower round SipHash? Probably best to stick with the
usual construction for non-DoS mitigation, but why not try SipHash 1-3,
1-2, etc. for DoS mitigation?

Rust and Swift both went with SipHash 1-3 for hash tables.
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