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48 lines
900 B
48 lines
900 B
#include "tommath_private.h"
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#ifdef BN_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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int n;
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mp_digit *tmpa, *tmpb;
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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 (b->alloc < a->used) {
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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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}
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/* zero b and copy the parameters over */
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/* pointer aliases */
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/* source */
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tmpa = a->dp;
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/* destination */
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tmpb = b->dp;
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/* copy all the digits */
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for (n = 0; n < a->used; n++) {
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*tmpb++ = *tmpa++;
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}
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/* clear high digits */
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MP_ZERO_DIGITS(tmpb, b->used - n);
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/* copy used count and sign */
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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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