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comparison libtommath/bn_mp_or.c @ 284:eed26cff980b

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
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children 5ff8218bcee9
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283:bd240aa12ba7 284:eed26cff980b
1 #include <tommath.h>
2 #ifdef BN_MP_OR_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
16 */
17
18 /* OR two ints together */
19 int mp_or (mp_int * a, mp_int * b, mp_int * c)
20 {
21 int res, ix, px;
22 mp_int t, *x;
23
24 if (a->used > b->used) {
25 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
26 return res;
27 }
28 px = b->used;
29 x = b;
30 } else {
31 if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
32 return res;
33 }
34 px = a->used;
35 x = a;
36 }
37
38 for (ix = 0; ix < px; ix++) {
39 t.dp[ix] |= x->dp[ix];
40 }
41 mp_clamp (&t);
42 mp_exch (c, &t);
43 mp_clear (&t);
44 return MP_OKAY;
45 }
46 #endif