tommath/bn_mp_reduce_setup.c

33 lines
927 B
C
Raw Normal View History

#include "tommath_private.h"
2004-10-29 18:07:18 -04:00
#ifdef BN_MP_REDUCE_SETUP_C
2003-08-04 21:24:44 -04:00
/* 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.
*/
/* pre-calculate the value required for Barrett reduction
* For a given modulus "b" it calulates the value required in "a"
*/
2017-09-20 10:59:43 -04:00
int mp_reduce_setup(mp_int *a, const mp_int *b)
2003-08-04 21:24:44 -04:00
{
2017-08-30 13:13:53 -04:00
int res;
2017-08-29 23:51:11 -04:00
2017-08-30 13:13:53 -04:00
if ((res = mp_2expt(a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
return res;
}
return mp_div(a, b, a, NULL);
2003-08-04 21:24:44 -04:00
}
2004-10-29 18:07:18 -04:00
#endif
2005-08-01 12:37:28 -04:00
2017-08-28 10:27:26 -04:00
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */