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comparison bn_mp_or.c @ 2:86e0b50a9b58 libtommath-orig ltm-0.30-orig

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ltm 0.30 orig import
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:22 +0000
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children d29b64170cf0
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-1:000000000000 2:86e0b50a9b58
1 /* LibTomMath, multiple-precision integer library -- Tom St Denis
2 *
3 * LibTomMath is a library that provides multiple-precision
4 * integer arithmetic as well as number theoretic functionality.
5 *
6 * The library was designed directly after the MPI library by
7 * Michael Fromberger but has been written from scratch with
8 * additional optimizations in place.
9 *
10 * The library is free for all purposes without any express
11 * guarantee it works.
12 *
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org
14 */
15 #include <tommath.h>
16
17 /* OR two ints together */
18 int mp_or (mp_int * a, mp_int * b, mp_int * c)
19 {
20 int res, ix, px;
21 mp_int t, *x;
22
23 if (a->used > b->used) {
24 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
25 return res;
26 }
27 px = b->used;
28 x = b;
29 } else {
30 if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
31 return res;
32 }
33 px = a->used;
34 x = a;
35 }
36
37 for (ix = 0; ix < px; ix++) {
38 t.dp[ix] |= x->dp[ix];
39 }
40 mp_clamp (&t);
41 mp_exch (c, &t);
42 mp_clear (&t);
43 return MP_OKAY;
44 }