39 lines
921 B
C
39 lines
921 B
C
#include "tommath_private.h"
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#ifdef BN_MP_NEG_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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/* b = -a */
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int mp_neg(const mp_int *a, mp_int *b)
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{
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int res;
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if (a != b) {
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if ((res = mp_copy(a, b)) != MP_OKAY) {
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return res;
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}
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}
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if (mp_iszero(b) != MP_YES) {
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b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
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} else {
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b->sign = MP_ZPOS;
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}
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return MP_OKAY;
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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