/usr/include/gf2x.h is in libgf2x-dev 1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | /* This file is part of the gf2x library.
Copyright 2007, 2008, 2009
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 the GNU General Public License as published by the
Free Software Foundation; either version 2 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 GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along
with this program; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02111-1307, USA.
*/
/* Multiplication over GF(2)[x] */
#ifndef GF2X_H_
#define GF2X_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h> /* size_t */
/* This is the toplevel multiplication routine, the only one that really
* matters. a and b point to polynomials whose coefficients span an and
* bn machine words (unsigned longs).
*
* c must have enough room to hold an+bn words.
*
* The destination pointer c may alias either a or b (that is, one may
* have c==a or c==b), but any other kind of overlap is unsupported).
*/
extern void gf2x_mul(unsigned long *c,
const unsigned long *a, unsigned int an,
const unsigned long *b, unsigned int bn);
/* The second version is reentrant */
struct gf2x_mul_pool_s {
unsigned long * stk;
size_t stk_size;
};
typedef struct gf2x_mul_pool_s gf2x_mul_pool_t[1];
extern void gf2x_mul_pool_init(gf2x_mul_pool_t);
extern void gf2x_mul_pool_clear(gf2x_mul_pool_t);
extern void gf2x_mul_r(unsigned long *c,
const unsigned long *a, unsigned int an,
const unsigned long *b, unsigned int bn, gf2x_mul_pool_t);
#ifdef __cplusplus
}
#endif
#endif /* GF2X_H_ */
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