lib/rand-isaac.h

   1 /* Bob Jenkins's cryptographic random number generator, ISAAC.
   2
   3    Copyright (C) 1999-2005 Free Software Foundation, Inc.
   4    Copyright (C) 1997, 1998, 1999 Colin Plumb.
   5
   6    This program is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation, either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19    Written by Colin Plumb.  */
  20
  21 #ifndef RAND_ISAAC_H
  22 # define RAND_ISAAC_H
  23
  24 # include <stdint.h>
  25
  26 /* Size of the state tables to use.  ISAAC_LOG should be at least 3,
  27    and smaller values give less security.  */
  28 # define ISAAC_LOG 8
  29 # define ISAAC_WORDS (1 << ISAAC_LOG)
  30 # define ISAAC_BYTES (ISAAC_WORDS * sizeof (uint32_t))
  31
  32 /* RNG state variables.  The members of this structure are private.  */
  33 struct isaac_state
  34   {
  35     uint32_t mm[ISAAC_WORDS];   /* Main state array */
  36     uint32_t iv[8];             /* Seeding initial vector */
  37     uint32_t a, b, c;           /* Extra index variables */
  38   };
  39
  40 void isaac_seed (struct isaac_state *);
  41 void isaac_refill (struct isaac_state *, uint32_t[ISAAC_WORDS]);
  42
  43 #endif