| #include <tommath.h> |
| #ifdef BN_MP_REDUCE_SETUP_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, tomstdenis@iahu.ca, http://math.libtomcrypt.org |
| */ |
| |
| /* pre-calculate the value required for Barrett reduction |
| * For a given modulus "b" it calulates the value required in "a" |
| */ |
| int 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); |
| } |
| #endif |
