1#include <tommath.h>
2#ifdef BN_MP_AND_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, tomstdenis@gmail.com, http://libtom.org
16 */
17
18/* AND two ints together */
19int
20mp_and (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
43  /* zero digits above the last from the smallest mp_int */
44  for (; ix < t.used; ix++) {
45    t.dp[ix] = 0;
46  }
47
48  mp_clamp (&t);
49  mp_exch (c, &t);
50  mp_clear (&t);
51  return MP_OKAY;
52}
53#endif
54
55/* $Source$ */
56/* $Revision$ */
57/* $Date$ */
58