crypto/external/bsd/heimdal/dist/lib/hcrypto/libtommath/bn_mp_and.c

   1 /*      $NetBSD: bn_mp_and.c,v 1.1.1.2 2014/04/24 12:45:31 pettai Exp $ */
   2
   3 #include <tommath.h>
   4 #ifdef BN_MP_AND_C
   5 /* LibTomMath, multiple-precision integer library -- Tom St Denis
   6  *
   7  * LibTomMath is a library that provides multiple-precision
   8  * integer arithmetic as well as number theoretic functionality.
   9  *
  10  * The library was designed directly after the MPI library by
  11  * Michael Fromberger but has been written from scratch with
  12  * additional optimizations in place.
  13  *
  14  * The library is free for all purposes without any express
  15  * guarantee it works.
  16  *
  17  * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
  18  */
  19
  20 /* AND two ints together */
  21 int
  22 mp_and (mp_int * a, mp_int * b, mp_int * c)
  23 {
  24   int     res, ix, px;
  25   mp_int  t, *x;
  26
  27   if (a->used > b->used) {
  28     if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
  29       return res;
  30     }
  31     px = b->used;
  32     x = b;
  33   } else {
  34     if ((res = mp_init_copy (&t, b)) != MP_OKAY) {
  35       return res;
  36     }
  37     px = a->used;
  38     x = a;
  39   }
  40
  41   for (ix = 0; ix < px; ix++) {
  42     t.dp[ix] &= x->dp[ix];
  43   }
  44
  45   /* zero digits above the last from the smallest mp_int */
  46   for (; ix < t.used; ix++) {
  47     t.dp[ix] = 0;
  48   }
  49
  50   mp_clamp (&t);
  51   mp_exch (c, &t);
  52   mp_clear (&t);
  53   return MP_OKAY;
  54 }
  55 #endif
  56
  57 /* Source: /cvs/libtom/libtommath/bn_mp_and.c,v  */
  58 /* Revision: 1.4  */
  59 /* Date: 2006/12/28 01:25:13  */