This is the reference implementation of siphash-2-4 from https://131002.net/siphash/siphash24.c
as of 2013-06-27.

/*
   SipHash reference C implementation

   Written in 2012 by 
   Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
   Daniel J. Bernstein <djb@cr.yp.to>

   To the extent possible under law, the author(s) have dedicated all copyright
   and related and neighboring rights to this software to the public domain
   worldwide. This software is distributed without any warranty.

   You should have received a copy of the CC0 Public Domain Dedication along with
   this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
*/

This is the basis for the siphash24 code incorporated in the CCNx library.