1 /* gmp_urandomb_ui -- random bits returned in a ulong. 2 3 Copyright 2003, 2004 Free Software Foundation, Inc. 4 5 This file is part of the GNU MP Library. 6 7 The GNU MP Library is free software; you can redistribute it and/or modify 8 it under the terms of either: 9 10 * the GNU Lesser General Public License as published by the Free 11 Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 or 15 16 * the GNU General Public License as published by the Free Software 17 Foundation; either version 2 of the License, or (at your option) any 18 later version. 19 20 or both in parallel, as here. 21 22 The GNU MP Library is distributed in the hope that it will be useful, but 23 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25 for more details. 26 27 You should have received copies of the GNU General Public License and the 28 GNU Lesser General Public License along with the GNU MP Library. If not, 29 see https://www.gnu.org/licenses/. */ 30 31 #include "gmp-impl.h" 32 33 34 /* Currently bits>=BITS_PER_ULONG is quietly truncated to BITS_PER_ULONG, 35 maybe this should raise an exception or something. */ 36 37 unsigned long 38 gmp_urandomb_ui (gmp_randstate_ptr rstate, unsigned long bits) 39 { 40 mp_limb_t a[LIMBS_PER_ULONG]; 41 42 /* start with zeros, since if bits==0 then _gmp_rand will store nothing at 43 all, or if bits <= GMP_NUMB_BITS then it will store only a[0] */ 44 a[0] = 0; 45 #if LIMBS_PER_ULONG > 1 46 a[1] = 0; 47 #endif 48 49 _gmp_rand (a, rstate, MIN (bits, BITS_PER_ULONG)); 50 51 #if LIMBS_PER_ULONG == 1 52 return a[0]; 53 #else 54 return a[0] | (a[1] << GMP_NUMB_BITS); 55 #endif 56 } 57
Indexes created Sat Feb 28 05:31:39 UTC 2026