49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#include <tommath_private.h>
|
|
#ifdef BN_MP_MOD_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis
|
|
*
|
|
* LibTomMath is a library that provides multiple-precision
|
|
* integer arithmetic as well as number theoretic functionality.
|
|
*
|
|
* The library was designed directly after the MPI library by
|
|
* Michael Fromberger but has been written from scratch with
|
|
* additional optimizations in place.
|
|
*
|
|
* The library is free for all purposes without any express
|
|
* guarantee it works.
|
|
*
|
|
* Tom St Denis, tstdenis82@gmail.com, http://libtom.org
|
|
*/
|
|
|
|
/* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
|
|
int
|
|
mp_mod (mp_int * a, mp_int * b, mp_int * c)
|
|
{
|
|
mp_int t;
|
|
int res;
|
|
|
|
if ((res = mp_init_size (&t, b->used)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
if ((res = mp_div (a, b, NULL, &t)) != MP_OKAY) {
|
|
mp_clear (&t);
|
|
return res;
|
|
}
|
|
|
|
if ((mp_iszero(&t) != MP_NO) || (t.sign == b->sign)) {
|
|
res = MP_OKAY;
|
|
mp_exch (&t, c);
|
|
} else {
|
|
res = mp_add (b, &t, c);
|
|
}
|
|
|
|
mp_clear (&t);
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|