1 /* $NetBSD: bn_mp_neg.c,v 1.2 2017/01/28 21:31:47 christos 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 */ mp_neg(mp_int * a,mp_int * b)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