/usr/include/gf2x/gf2x_mul2.h is in libgf2x-dev 1.2-5.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | /* This file is part of the gf2x library.
Copyright 2007, 2008, 2009, 2010, 2013, 2015
Richard Brent, Pierrick Gaudry, Emmanuel Thome', Paul Zimmermann
This program is free software; you can redistribute it and/or modify it
under the terms of either:
- If the archive contains a file named toom-gpl.c (not a trivial
placeholder), the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
- If the archive contains a file named toom-gpl.c which is a trivial
placeholder, the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the license text for more details.
You should have received a copy of the GNU General Public License as
well as the GNU Lesser General Public License along with this program;
see the files COPYING and COPYING.LIB. If not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#ifndef GF2X_MUL2_H_
#define GF2X_MUL2_H_
#include "gf2x.h"
/* All gf2x source files for lowlevel functions must include gf2x-small.h
* This is mandatory for the tuning mechanism. */
#include "gf2x/gf2x-small.h"
GF2X_STORAGE_CLASS_mul2 void gf2x_mul2(unsigned long *c, const unsigned long *a, const unsigned long *b)
{
unsigned long t;
unsigned long u[2];
gf2x_mul1 (c, a[0], b[0]);
gf2x_mul1 (c+2, a[1], b[1]);
t = c[1]^c[2];
gf2x_mul1 (u, a[0]^a[1], b[0]^b[1]);
c[1] = c[0]^u[0]^t;
c[2] = c[3]^u[1]^t;
}
#endif /* GF2X_MUL2_H_ */
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