diff options
Diffstat (limited to 'gl/lib/rand-isaac.h')
| -rw-r--r-- | gl/lib/rand-isaac.h | 53 |
1 files changed, 37 insertions, 16 deletions
diff --git a/gl/lib/rand-isaac.h b/gl/lib/rand-isaac.h index 052dc9f3a..6e5af0676 100644 --- a/gl/lib/rand-isaac.h +++ b/gl/lib/rand-isaac.h @@ -1,4 +1,4 @@ -/* Bob Jenkins's cryptographic random number generator, ISAAC. +/* Bob Jenkins's cryptographic random number generators, ISAAC and ISAAC64. Copyright (C) 1999-2005, 2009-2010 Free Software Foundation, Inc. Copyright (C) 1997, 1998, 1999 Colin Plumb. @@ -16,29 +16,50 @@ You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. - Written by Colin Plumb. */ + Written by Colin Plumb and Paul Eggert. */ -#ifndef RAND_ISAAC_H -# define RAND_ISAAC_H +#ifndef _GL_RAND_ISAAC_H +#define _GL_RAND_ISAAC_H -# include <stddef.h> -# include <stdint.h> +#include <stddef.h> +#include <stdint.h> -/* Size of the state tables to use. ISAAC_LOG should be at least 3, +/* Log base 2 of the number of useful bits in an ISAAC word. It must + be either 5 or 6. By default, this uses a value that should be + faster for this architecture. */ +#ifndef ISAAC_BITS_LOG + #if SIZE_MAX >> 31 >> 31 < 3 /* SIZE_MAX < 2**64 - 1 */ + #define ISAAC_BITS_LOG 5 + #else + #define ISAAC_BITS_LOG 6 + #endif +#endif + +/* The number of bits in an ISAAC word. */ +#define ISAAC_BITS (1 << ISAAC_BITS_LOG) + +#if ISAAC_BITS == 32 + typedef uint_least32_t isaac_word; +#else + typedef uint_least64_t isaac_word; +#endif + +/* Size of the state tables to use. ISAAC_WORDS_LOG should be at least 3, and smaller values give less security. */ -# define ISAAC_LOG 8 -# define ISAAC_WORDS (1 << ISAAC_LOG) -# define ISAAC_BYTES (ISAAC_WORDS * sizeof (uint32_t)) +#define ISAAC_WORDS_LOG 8 +#define ISAAC_WORDS (1 << ISAAC_WORDS_LOG) +#define ISAAC_BYTES (ISAAC_WORDS * sizeof (isaac_word)) -/* RNG state variables. The members of this structure are private. */ +/* State variables for the random number generator. The M member + should be seeded with nonce data before calling isaac_seed. The + other members are private. */ struct isaac_state { - uint32_t mm[ISAAC_WORDS]; /* Main state array */ - uint32_t iv[8]; /* Seeding initial vector */ - uint32_t a, b, c; /* Extra index variables */ + isaac_word m[ISAAC_WORDS]; /* Main state array */ + isaac_word a, b, c; /* Extra variables */ }; -void isaac_seed (struct isaac_state *, int, size_t); -void isaac_refill (struct isaac_state *, uint32_t[ISAAC_WORDS]); +void isaac_seed (struct isaac_state *); +void isaac_refill (struct isaac_state *, isaac_word[ISAAC_WORDS]); #endif |