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/* LibTomMath, multiple-precision integer library -- Tom St Denis
* LibTomMath is library that provides for multiple-precision
* integer arithmetic as well as number theoretic functionality.
* The library is 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,,
#include <tommath.h>
/* pre-calculate the value required for Barrett reduction
* For a given modulus "b" it calulates the value required in "a"
mp_reduce_setup (mp_int * a, mp_int * b)
int res;
if ((res = mp_2expt (a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
return res;
return mp_div (a, b, a, NULL);
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