26 lines
689 B
C
26 lines
689 B
C
#include "amplify_tommath_private.h"
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#ifdef AMPLIFY_BN_MP_NEG_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/* Modifications Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. */
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/* b = -a */
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amplify_mp_err amplify_mp_neg(const amplify_mp_int *a, amplify_mp_int *b)
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{
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amplify_mp_err err;
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if (a != b) {
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if ((err = amplify_mp_copy(a, b)) != AMPLIFY_MP_OKAY) {
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return err;
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}
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}
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if (!AMPLIFY_MP_IS_ZERO(b)) {
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b->sign = (a->sign == AMPLIFY_MP_ZPOS) ? AMPLIFY_MP_NEG : AMPLIFY_MP_ZPOS;
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} else {
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b->sign = AMPLIFY_MP_ZPOS;
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}
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return AMPLIFY_MP_OKAY;
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}
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#endif
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