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, tomstdenis@gmail.com, http://math.libtomcrypt.com 16 */ 17 18/* XOR two ints together */ 19int 20mp_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 48 49/* $Source: /cvs/libtom/libtommath/bn_mp_xor.c,v $ */ 50/* $Revision: 1.3 $ */ 51/* $Date: 2006/03/31 14:18:44 $ */ 52