xref: /netbsd-src/external/lgpl3/gmp/dist/mpz/urandomb.c (revision a8c74629f602faa0ccf8a463757d7baf858bbf3a)
1 /* mpz_urandomb (rop, state, n) -- Generate a uniform pseudorandom
2    integer in the range 0 to 2^N - 1, inclusive, using STATE as the
3    random state previously initialized by a call to gmp_randinit().
4 
5 Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
6 
7 This file is part of the GNU MP Library.
8 
9 The GNU MP Library is free software; you can redistribute it and/or modify
10 it under the terms of either:
11 
12   * the GNU Lesser General Public License as published by the Free
13     Software Foundation; either version 3 of the License, or (at your
14     option) any later version.
15 
16 or
17 
18   * the GNU General Public License as published by the Free Software
19     Foundation; either version 2 of the License, or (at your option) any
20     later version.
21 
22 or both in parallel, as here.
23 
24 The GNU MP Library is distributed in the hope that it will be useful, but
25 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
26 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
27 for more details.
28 
29 You should have received copies of the GNU General Public License and the
30 GNU Lesser General Public License along with the GNU MP Library.  If not,
31 see https://www.gnu.org/licenses/.  */
32 
33 #include "gmp-impl.h"
34 
35 void
36 mpz_urandomb (mpz_ptr rop, gmp_randstate_t rstate, mp_bitcnt_t nbits)
37 {
38   mp_ptr rp;
39   mp_size_t size;
40 
41   size = BITS_TO_LIMBS (nbits);
42   rp = MPZ_NEWALLOC (rop, size);
43 
44   _gmp_rand (rp, rstate, nbits);
45   MPN_NORMALIZE (rp, size);
46   SIZ (rop) = size;
47 }
48