1/*	$NetBSD: bn_mp_neg.c,v 1.1.1.1 2011/04/13 18:14:54 elric Exp $	*/
2
3#include <tommath.h>
4#ifdef BN_MP_NEG_C
5/* LibTomMath, multiple-precision integer library -- Tom St Denis
6 *
7 * LibTomMath is a library that provides multiple-precision
8 * integer arithmetic as well as number theoretic functionality.
9 *
10 * The library was designed directly after the MPI library by
11 * Michael Fromberger but has been written from scratch with
12 * additional optimizations in place.
13 *
14 * The library is free for all purposes without any express
15 * guarantee it works.
16 *
17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
18 */
19
20/* b = -a */
21int mp_neg (mp_int * a, mp_int * b)
22{
23  int     res;
24  if (a != b) {
25     if ((res = mp_copy (a, b)) != MP_OKAY) {
26        return res;
27     }
28  }
29
30  if (mp_iszero(b) != MP_YES) {
31     b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
32  } else {
33     b->sign = MP_ZPOS;
34  }
35
36  return MP_OKAY;
37}
38#endif
39
40/* Source: /cvs/libtom/libtommath/bn_mp_neg.c,v */
41/* Revision: 1.4 */
42/* Date: 2006/12/28 01:25:13 */
43