1/* mpn_random -- Generate random numbers.
2
3Copyright 2001, 2002 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include "gmp.h"
21#include "gmp-impl.h"
22
23void
24mpn_random (mp_ptr ptr, mp_size_t size)
25{
26  gmp_randstate_ptr  rands;
27
28  /* FIXME: Is size==0 supposed to be allowed? */
29  ASSERT (size >= 0);
30
31  if (size == 0)
32    return;
33
34  rands = RANDS;
35  _gmp_rand (ptr, rands, size * GMP_NUMB_BITS);
36
37  /* Make sure the most significant limb is non-zero.  */
38  while (ptr[size-1] == 0)
39    _gmp_rand (&ptr[size-1], rands, GMP_NUMB_BITS);
40}
41