comparison libtommath/bn_mp_neg.c @ 1692:1051e4eea25a

Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents f52919ffd3b1
children
comparison
equal deleted inserted replaced
1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h" 1 #include "tommath_private.h"
2 #ifdef BN_MP_NEG_C 2 #ifdef BN_MP_NEG_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
4 * 4 /* SPDX-License-Identifier: Unlicense */
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * SPDX-License-Identifier: Unlicense
13 */
14 5
15 /* b = -a */ 6 /* b = -a */
16 int mp_neg(const mp_int *a, mp_int *b) 7 mp_err mp_neg(const mp_int *a, mp_int *b)
17 { 8 {
18 int res; 9 mp_err err;
19 if (a != b) { 10 if (a != b) {
20 if ((res = mp_copy(a, b)) != MP_OKAY) { 11 if ((err = mp_copy(a, b)) != MP_OKAY) {
21 return res; 12 return err;
22 } 13 }
23 } 14 }
24 15
25 if (mp_iszero(b) != MP_YES) { 16 if (!MP_IS_ZERO(b)) {
26 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; 17 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
27 } else { 18 } else {
28 b->sign = MP_ZPOS; 19 b->sign = MP_ZPOS;
29 } 20 }
30 21
31 return MP_OKAY; 22 return MP_OKAY;
32 } 23 }
33 #endif 24 #endif
34
35 /* ref: HEAD -> master, tag: v1.1.0 */
36 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
37 /* commit time: 2019-01-28 20:32:32 +0100 */