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Subject: Re: [kernel-hardening] Re: HalfSipHash Acceptable Usage
To: kernel-hardening@lists.openwall.com, "Theodore Ts'o" <tytso@mit.edu>,
        George Spelvin <linux@sciencehorizons.net>,
        Eric Dumazet <eric.dumazet@gmail.com>, Jason <Jason@zx2c4.com>,
        Andi Kleen <ak@linux.intel.com>, David Miller <davem@davemloft.net>,
        David Laight <David.Laight@aculab.com>,
        "Daniel J . Bernstein" <djb@cr.yp.to>,
        Eric Biggers <ebiggers3@gmail.com>,
        Hannes Frederic Sowa <hannes@stressinduktion.org>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
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        Andy Lutomirski <luto@amacapital.net>, Netdev <netdev@vger.kernel.org>,
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        Linus Torvalds <torvalds@linux-foundation.org>,
        Vegard Nossum <vegard.nossum@gmail.com>
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On Wed, Dec 21, 2016 at 11:27 PM, Theodore Ts'o <tytso@mit.edu> wrote:
> And "with enough registers" includes ARM and MIPS, right?  So the only
> real problem is 32-bit x86, and you're right, at that point, only
> people who might care are people who are using a space-radiation
> hardened 386 --- and they're not likely to be doing high throughput
> TCP connections.  :-)

Plus the benchmark was bogus anyway, and when I built a more specific
harness -- actually comparing the TCP sequence number functions --
SipHash was faster than MD5, even on register starved x86. So I think
we're fine and this chapter of the discussion can come to a close, in
order to move on to more interesting things.