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@gmail.com, http://math.libtomcrypt.com
16 */
17
18 /* d = a * b (mod c) */
mp_mulmod(mp_int * a,mp_int * b,mp_int * c,mp_int * d)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