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      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