mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-15 19:48:56 +00:00
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#include <tommath.h>
|
|
#ifdef BN_MP_REDUCE_2K_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@gmail.com, http://math.libtomcrypt.com
|
|
*/
|
|
|
|
/* determines the setup value */
|
|
int 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) {
|
|
mp_clear(&tmp);
|
|
return res;
|
|
}
|
|
|
|
if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
|
|
mp_clear(&tmp);
|
|
return res;
|
|
}
|
|
|
|
*d = tmp.dp[0];
|
|
mp_clear(&tmp);
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* $Source: /cvs/libtom/libtommath/bn_mp_reduce_2k_setup.c,v $ */
|
|
/* $Revision: 1.3 $ */
|
|
/* $Date: 2006/03/31 14:18:44 $ */
|