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comparison libtommath/bn_mp_xor.c @ 293:9d110777f345 contrib-blacklist

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propagate from branch 'au.asn.ucc.matt.dropbear' (head 7ad1775ed65e75dbece27fe6b65bf1a234db386a) to branch 'au.asn.ucc.matt.dropbear.contrib.blacklist' (head 1d86a4f0a401cc68c2670d821a2f6366c37af143)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 10 Mar 2006 06:31:29 +0000
parents eed26cff980b
children 5ff8218bcee9
comparison
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247:c07de41b53d7 293:9d110777f345
1 #include <tommath.h>
2 #ifdef BN_MP_XOR_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 /* XOR two ints together */
19 int
20 mp_xor (mp_int * a, mp_int * b, mp_int * c)
21 {
22 int res, ix, px;
23 mp_int t, *x;
24
25 if (a->used > b->used) {
26 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
27 return res;
28 }
29 px = b->used;
30 x = b;
31 } else {
32 if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
33 return res;
34 }
35 px = a->used;
36 x = a;
37 }
38
39 for (ix = 0; ix < px; ix++) {
40 t.dp[ix] ^= x->dp[ix];
41 }
42 mp_clamp (&t);
43 mp_exch (c, &t);
44 mp_clear (&t);
45 return MP_OKAY;
46 }
47 #endif