2 #ifdef BN_MP_REDUCE_SETUP_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
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.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
18 /* pre-calculate the value required for Barrett reduction
19 * For a given modulus "b" it calulates the value required in "a"
21 int mp_reduce_setup (mp_int * a, mp_int * b)
25 if ((res = mp_2expt (a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
28 return mp_div (a, b, a, NULL);