1/*	$NetBSD: bn_mp_mod.c,v 1.2 2017/01/28 21:31:47 christos Exp $	*/
2
3#include <tommath.h>
4#ifdef BN_MP_MOD_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/* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
21int
22mp_mod (mp_int * a, mp_int * b, mp_int * c)
23{
24  mp_int  t;
25  int     res;
26
27  if ((res = mp_init (&t)) != MP_OKAY) {
28    return res;
29  }
30
31  if ((res = mp_div (a, b, NULL, &t)) != MP_OKAY) {
32    mp_clear (&t);
33    return res;
34  }
35
36  if (mp_iszero(&t) || t.sign == b->sign) {
37    res = MP_OKAY;
38    mp_exch (&t, c);
39  } else {
40    res = mp_add (b, &t, c);
41  }
42
43  mp_clear (&t);
44  return res;
45}
46#endif
47
48/* Source: /cvs/libtom/libtommath/bn_mp_mod.c,v  */
49/* Revision: 1.4  */
50/* Date: 2006/12/28 01:25:13  */
51