Mercurial > dropbear

annotate libtommath/bn_mp_copy.c @ 1792:2bf1e97ba3cd

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Update INSTALL (#113) Make Git/Mercurial instructions easier to understand
author Xenhat <commits@xenh.at>
date Thu, 17 Dec 2020 04:35:48 -0500
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_COPY_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* copy, b = a */
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7 mp_err mp_copy(const mp_int *a, mp_int *b)
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8 {
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9 int n;
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10 mp_digit *tmpa, *tmpb;
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11 mp_err err;
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13 /* if dst == src do nothing */
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14 if (a == b) {
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15 return MP_OKAY;
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16 }
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18 /* grow dest */
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19 if (b->alloc < a->used) {
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20 if ((err = mp_grow(b, a->used)) != MP_OKAY) {
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21 return err;
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22 }
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23 }
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25 /* zero b and copy the parameters over */
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26 /* pointer aliases */
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28 /* source */
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29 tmpa = a->dp;
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31 /* destination */
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32 tmpb = b->dp;
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34 /* copy all the digits */
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35 for (n = 0; n < a->used; n++) {
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36 *tmpb++ = *tmpa++;
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37 }
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38
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39 /* clear high digits */
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40 MP_ZERO_DIGITS(tmpb, b->used - n);
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42 /* copy used count and sign */
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43 b->used = a->used;
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44 b->sign = a->sign;
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45 return MP_OKAY;
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46 }
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47 #endif