1/* $NetBSD: bn_mp_and.c,v 1.2 2017/01/28 21:31:47 christos 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 */ 21int 22mp_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 */ 60