Mercurial > dropbear

annotate libtommath/bn_mp_and.c @ 378:a124aff0cbf1

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merge of '182c2d8dbd5321ef4d1df8758936f4dc7127015f' and '31dcd7a22983ef19d6c63248e415e71d292dd0ec'
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Dec 2006 13:11:41 +0000
parents eed26cff980b
children 5ff8218bcee9
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284
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1 #include <tommath.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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
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16 */
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17
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18 /* AND two ints together */
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19 int
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20 mp_and (mp_int * a, mp_int * b, mp_int * c)
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21 {
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22 int res, ix, px;
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23 mp_int t, *x;
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24
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25 if (a->used > b->used) {
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26 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
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27 return res;
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28 }
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29 px = b->used;
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30 x = b;
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31 } else {
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32 if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
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33 return res;
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34 }
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35 px = a->used;
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36 x = a;
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37 }
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38
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39 for (ix = 0; ix < px; ix++) {
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40 t.dp[ix] &= x->dp[ix];
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41 }
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42
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43 /* zero digits above the last from the smallest mp_int */
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44 for (; ix < t.used; ix++) {
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45 t.dp[ix] = 0;
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46 }
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47
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48 mp_clamp (&t);
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49 mp_exch (c, &t);
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50 mp_clear (&t);
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51 return MP_OKAY;
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52 }
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53 #endif