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

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Date:   Tue, 13 Dec 2016 00:04:27 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        George Spelvin <linux@...izon.com>,
        Scott Bauer <sbauer@....utah.edu>,
        Andy Lutomirski <luto@...capital.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        "Daniel J . Bernstein" <djb@...yp.to>
Subject: Re: [PATCH v3] siphash: add cryptographically secure hashtable function

On Tue, Dec 13, 2016 at 12:01 AM, Andi Kleen <ak@...ux.intel.com> wrote:
> It would be nice if the network code could be converted to use siphash
> for the secure sequence numbers. Right now it pulls in a lot of code
> for bigger secure hashes just for that, which is a problem for tiny
> kernels.

Indeed this would be a great first candidate. There are lots of places
where MD5 (!!) is pulled in for this sort of thing, when SipHash could
be a faster and leaner replacement (and arguably more secure than
rusty MD5).