1 #include <tommath.h> 2 #ifdef BN_MP_MULMOD_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 (at) gmail.com, http://math.libtomcrypt.com 16 */ 17 18 /* d = a * b (mod c) */ 19 int mp_mulmod (mp_int * a, mp_int * b, mp_int * c, mp_int * d) 20 { 21 int res; 22 mp_int t; 23 24 if ((res = mp_init (&t)) != MP_OKAY) { 25 return res; 26 } 27 28 if ((res = mp_mul (a, b, &t)) != MP_OKAY) { 29 mp_clear (&t); 30 return res; 31 } 32 res = mp_mod (&t, c, d); 33 mp_clear (&t); 34 return res; 35 } 36 #endif 37 38 /* $Source: /cvs/libtom/libtommath/bn_mp_mulmod.c,v $ */ 39 /* $Revision: 1.4 $ */ 40 /* $Date: 2006/03/31 14:18:44 $ */ 41
