/src/dropbear/libtommath/bn_mp_neg.c
Line | Count | Source |
1 | | #include "tommath_private.h" |
2 | | #ifdef BN_MP_NEG_C |
3 | | /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
4 | | /* SPDX-License-Identifier: Unlicense */ |
5 | | |
6 | | /* b = -a */ |
7 | | mp_err mp_neg(const mp_int *a, mp_int *b) |
8 | 0 | { |
9 | 0 | mp_err err; |
10 | 0 | if (a != b) { |
11 | 0 | if ((err = mp_copy(a, b)) != MP_OKAY) { |
12 | 0 | return err; |
13 | 0 | } |
14 | 0 | } |
15 | | |
16 | 0 | if (!MP_IS_ZERO(b)) { |
17 | 0 | b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; |
18 | 0 | } else { |
19 | 0 | b->sign = MP_ZPOS; |
20 | 0 | } |
21 | |
|
22 | 0 | return MP_OKAY; |
23 | 0 | } |
24 | | #endif |