Line data Source code
1 : #include <tommath.h>
2 : #ifdef BN_MP_NEG_C
3 : /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 : *
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 : * The library is free for all purposes without any express
13 : * guarantee it works.
14 : *
15 : * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
16 : */
17 :
18 : /* b = -a */
19 0 : int mp_neg (mp_int * a, mp_int * b)
20 : {
21 : int res;
22 0 : if (a != b) {
23 0 : if ((res = mp_copy (a, b)) != MP_OKAY) {
24 0 : return res;
25 : }
26 : }
27 :
28 0 : if (mp_iszero(b) != MP_YES) {
29 0 : b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
30 : } else {
31 0 : b->sign = MP_ZPOS;
32 : }
33 :
34 0 : return MP_OKAY;
35 : }
36 : #endif
37 :
38 : /* $Source: /cvs/libtom/libtommath/bn_mp_neg.c,v $ */
39 : /* $Revision: 1.4 $ */
40 : /* $Date: 2006/12/28 01:25:13 $ */
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