1 /*	$NetBSD: bn_mp_submod.c,v 1.1.1.1 2011/04/13 18:14:54 elric Exp $	*/
2 
3 #include <tommath.h>
4 #ifdef BN_MP_SUBMOD_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 /* d = a - b (mod c) */
21 int
22 mp_submod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
23 {
24   int     res;
25   mp_int  t;
26 
27 
28   if ((res = mp_init (&t)) != MP_OKAY) {
29     return res;
30   }
31 
32   if ((res = mp_sub (a, b, &t)) != MP_OKAY) {
33     mp_clear (&t);
34     return res;
35   }
36   res = mp_mod (&t, c, d);
37   mp_clear (&t);
38   return res;
39 }
40 #endif
41 
42 /* Source: /cvs/libtom/libtommath/bn_mp_submod.c,v */
43 /* Revision: 1.4 */
44 /* Date: 2006/12/28 01:25:13 */
45