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annotate libtommath/bn_mp_and.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_AND_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 /* AND two ints together */
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16 int mp_and(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 int res, ix, px;
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19 mp_int t;
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20 const mp_int *x;
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21
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22 if (a->used > b->used) {
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23 if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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24 return res;
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25 }
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26 px = b->used;
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27 x = b;
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28 } else {
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29 if ((res = mp_init_copy(&t, b)) != MP_OKAY) {
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30 return res;
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31 }
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32 px = a->used;
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33 x = a;
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34 }
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35
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36 for (ix = 0; ix < px; ix++) {
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37 t.dp[ix] &= x->dp[ix];
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38 }
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39
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40 /* zero digits above the last from the smallest mp_int */
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41 for (; ix < t.used; ix++) {
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42 t.dp[ix] = 0;
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43 }
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44
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45 mp_clamp(&t);
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46 mp_exch(c, &t);
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47 mp_clear(&t);
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48 return MP_OKAY;
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49 }
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50 #endif
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51
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52 /* ref: HEAD -> master, tag: v1.1.0 */
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53 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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54 /* commit time: 2019-01-28 20:32:32 +0100 */