Mercurial > dropbear

annotate libtommath/bn_mp_copy.c @ 1664:871484eac157

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merge
author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Mar 2020 23:33:30 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* copy, b = a */
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16 int mp_copy(const mp_int *a, mp_int *b)
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17 {
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18 int res, n;
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20 /* if dst == src do nothing */
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21 if (a == b) {
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22 return MP_OKAY;
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23 }
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25 /* grow dest */
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26 if (b->alloc < a->used) {
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27 if ((res = mp_grow(b, a->used)) != MP_OKAY) {
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28 return res;
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29 }
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30 }
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32 /* zero b and copy the parameters over */
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33 {
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34 mp_digit *tmpa, *tmpb;
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36 /* pointer aliases */
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38 /* source */
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39 tmpa = a->dp;
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41 /* destination */
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42 tmpb = b->dp;
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44 /* copy all the digits */
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45 for (n = 0; n < a->used; n++) {
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46 *tmpb++ = *tmpa++;
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47 }
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49 /* clear high digits */
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50 for (; n < b->used; n++) {
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51 *tmpb++ = 0;
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52 }
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53 }
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54
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55 /* copy used count and sign */
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56 b->used = a->used;
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57 b->sign = a->sign;
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58 return MP_OKAY;
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59 }
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60 #endif
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61
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62 /* ref: HEAD -> master, tag: v1.1.0 */
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63 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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64 /* commit time: 2019-01-28 20:32:32 +0100 */