30 lines
628 B
C
30 lines
628 B
C
#include "tommath_private.h"
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#ifdef MP_COPY_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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/* copy, b = a */
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mp_err mp_copy(const mp_int *a, mp_int *b)
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{
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mp_err err;
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/* if dst == src do nothing */
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if (a == b) {
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return MP_OKAY;
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}
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/* grow dest */
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if ((err = mp_grow(b, a->used)) != MP_OKAY) {
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return err;
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}
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/* copy everything over and zero high digits */
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s_mp_copy_digs(b->dp, a->dp, a->used);
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s_mp_zero_digs(b->dp + a->used, b->used - a->used);
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b->used = a->used;
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b->sign = a->sign;
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return MP_OKAY;
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}
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#endif
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