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#include <tommath.h>
/* 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,,
/* c = a * a (mod b) */
mp_sqrmod (mp_int * a, mp_int * b, mp_int * c)
int res;
mp_int t;
if ((res = mp_init (&t)) != MP_OKAY) {
return res;
if ((res = mp_sqr (a, &t)) != MP_OKAY) {
mp_clear (&t);
return res;
res = mp_mod (&t, b, c);
mp_clear (&t);
return res;
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