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annotate libtommath/bn_mp_xor.c @ 1669:3080aed32bf1

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scp.c: Port OpenSSH CVE-2018-20685 fix (#80)
author Haelwenn Monnier <contact+github.com@hacktivis.me>
date Mon, 25 May 2020 14:54:29 +0200
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_XOR_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 /* XOR two ints together */
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16 int mp_xor(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 mp_clamp(&t);
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40 mp_exch(c, &t);
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41 mp_clear(&t);
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42 return MP_OKAY;
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43 }
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44 #endif
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45
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46 /* ref: HEAD -> master, tag: v1.1.0 */
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47 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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48 /* commit time: 2019-01-28 20:32:32 +0100 */