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Message-Id: <1481922923.2204853.821591377.2CD623CB@webmail.messagingengine.com>
Date: Fri, 16 Dec 2016 22:15:23 +0100
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: "Jason A. Donenfeld" <Jason@...c4.com>,
kernel-hardening@...ts.openwall.com, "Theodore Ts'o" <tytso@....edu>,
George Spelvin <linux@...encehorizons.net>,
Andi Kleen <ak@...ux.intel.com>, David Miller <davem@...emloft.net>,
David Laight <David.Laight@...lab.com>,
"Daniel J . Bernstein" <djb@...yp.to>,
Eric Biggers <ebiggers3@...il.com>,
"Jean-Philippe Aumasson" <jeanphilippe.aumasson@...il.com>,
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>,
Tom Herbert <tom@...bertland.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: Re: [PATCH v5 1/4] siphash: add cryptographically
secure PRF
On Fri, Dec 16, 2016, at 22:01, Jason A. Donenfeld wrote:
> Yes, on x86-64. But on i386 chacha20 incurs nearly the same kind of
> slowdown as siphash, so I expect the comparison to be more or less
> equal. There's another thing I really didn't like about your chacha20
> approach which is that it uses the /dev/urandom pool, which means
> various things need to kick in in the background to refill this.
> Additionally, having to refill the buffered chacha output every 32 or
> so longs isn't nice. These things together make for inconsistent and
> hard to understand general operating system performance, because
> get_random_long is called at every process startup for ASLR. So, in
> the end, I believe there's another reason for going with the siphash
> approach: deterministic performance.
*Hust*, so from where do you generate your key for siphash if called
early from ASLR?
Bye,
Hannes
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