Skip to content


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

43 lines (37 sloc) 1.007 kb
/* 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,,
#include <tommath.h>
/* determines the setup value */
mp_reduce_2k_setup(mp_int *a, mp_digit *d)
int res, p;
mp_int tmp;
if ((res = mp_init(&tmp)) != MP_OKAY) {
return res;
p = mp_count_bits(a);
if ((res = mp_2expt(&tmp, p)) != MP_OKAY) {
return res;
if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
return res;
*d = tmp.dp[0];
return MP_OKAY;
Jump to Line
Something went wrong with that request. Please try again.