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comparison 3rdparty/libtommath/bn_mp_mod.c @ 0:2cf249471370

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author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Tue, 08 May 2018 16:09:12 +0900
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-1:000000000000 0:2cf249471370
1 #include <tommath_private.h>
2 #ifdef BN_MP_MOD_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, tstdenis82@gmail.com, http://libtom.org
16 */
17
18 /* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
19 int
20 mp_mod (mp_int * a, mp_int * b, mp_int * c)
21 {
22 mp_int t;
23 int res;
24
25 if ((res = mp_init (&t)) != MP_OKAY) {
26 return res;
27 }
28
29 if ((res = mp_div (a, b, NULL, &t)) != MP_OKAY) {
30 mp_clear (&t);
31 return res;
32 }
33
34 if ((mp_iszero(&t) != MP_NO) || (t.sign == b->sign)) {
35 res = MP_OKAY;
36 mp_exch (&t, c);
37 } else {
38 res = mp_add (b, &t, c);
39 }
40
41 mp_clear (&t);
42 return res;
43 }
44 #endif
45
46 /* $Source$ */
47 /* $Revision$ */
48 /* $Date$ */