tommath/bn_mp_shrink.c
2010-07-15 17:25:39 +02:00

30 lines
812 B
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
*/
#include <tommath.h>
/* shrink a bignum */
int mp_shrink (mp_int * a)
{
mp_digit *tmp;
if (a->alloc != a->used) {
if ((tmp = OPT_CAST XREALLOC (a->dp, sizeof (mp_digit) * a->used)) == NULL) {
return MP_MEM;
}
a->dp = tmp;
a->alloc = a->used;
}
return MP_OKAY;
}