mirror of
http://galexander.org/git/simplesshd.git
synced 2024-11-30 19:28:10 +00:00
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#include <tommath.h>
|
|
#ifdef BN_MP_RAND_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
|
|
*/
|
|
|
|
/* makes a pseudo-random int of a given size */
|
|
int
|
|
mp_rand (mp_int * a, int digits)
|
|
{
|
|
int res;
|
|
mp_digit d;
|
|
|
|
mp_zero (a);
|
|
if (digits <= 0) {
|
|
return MP_OKAY;
|
|
}
|
|
|
|
/* first place a random non-zero digit */
|
|
do {
|
|
d = ((mp_digit) abs (rand ())) & MP_MASK;
|
|
} while (d == 0);
|
|
|
|
if ((res = mp_add_d (a, d, a)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
while (--digits > 0) {
|
|
if ((res = mp_lshd (a, 1)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
if ((res = mp_add_d (a, ((mp_digit) abs (rand ())), a)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* $Source: /cvs/libtom/libtommath/bn_mp_rand.c,v $ */
|
|
/* $Revision: 1.3 $ */
|
|
/* $Date: 2006/03/31 14:18:44 $ */
|