tommath/bn_mp_init_size.c

49 lines
1.1 KiB
C
Raw Normal View History

#include <tommath_private.h>
2004-10-29 18:07:18 -04:00
#ifdef BN_MP_INIT_SIZE_C
2003-02-28 11:08:34 -05:00
/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
2003-08-04 21:24:44 -04:00
* LibTomMath is a library that provides multiple-precision
2003-02-28 11:08:34 -05:00
* integer arithmetic as well as number theoretic functionality.
*
2003-08-04 21:24:44 -04:00
* The library was designed directly after the MPI library by
2003-02-28 11:08:34 -05:00
* 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, tstdenis82@gmail.com, http://libtom.org
2003-02-28 11:08:34 -05:00
*/
2003-08-04 21:24:44 -04:00
/* init an mp_init for a given size */
2003-12-24 13:59:22 -05:00
int mp_init_size (mp_int * a, int size)
2003-02-28 11:08:34 -05:00
{
2004-10-29 18:07:18 -04:00
int x;
2003-03-29 13:16:01 -05:00
/* pad size so there are always extra digits */
2017-08-29 23:51:11 -04:00
size += (MP_PREC * 2) - (size % MP_PREC);
2003-03-29 13:16:01 -05:00
/* alloc mem */
2004-10-29 18:07:18 -04:00
a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size);
2003-02-28 11:08:34 -05:00
if (a->dp == NULL) {
return MP_MEM;
}
2004-10-29 18:07:18 -04:00
/* set the members */
2003-08-04 21:24:44 -04:00
a->used = 0;
2003-02-28 11:08:34 -05:00
a->alloc = size;
2003-08-04 21:24:44 -04:00
a->sign = MP_ZPOS;
2003-02-28 11:08:34 -05:00
2004-10-29 18:07:18 -04:00
/* zero the digits */
for (x = 0; x < size; x++) {
a->dp[x] = 0;
}
2003-02-28 11:08:34 -05:00
return MP_OKAY;
}
2004-10-29 18:07:18 -04:00
#endif
2005-08-01 12:37:28 -04:00
2017-08-28 10:27:26 -04:00
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */