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/*
* prng.h: Pseudo Random Number Generator abstractions for nwipe.
*
* Copyright Darik Horn <dajhorn-dban@vanadac.com>.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#ifndef PRNG_H_
#define PRNG_H_
#include <sys/types.h>
/* A chunk of random data. */
typedef struct
{
size_t length; // Length of the entropy string in bytes.
u8* s; // The actual bytes of the entropy string.
} nwipe_entropy_t;
#define NWIPE_PRNG_INIT_SIGNATURE void **state, nwipe_entropy_t *seed
#define NWIPE_PRNG_READ_SIGNATURE void **state, void *buffer, size_t count
/* Function pointers for PRNG actions. */
typedef int ( *nwipe_prng_init_t )( NWIPE_PRNG_INIT_SIGNATURE );
typedef int ( *nwipe_prng_read_t )( NWIPE_PRNG_READ_SIGNATURE );
/* The generic PRNG definition. */
typedef struct
{
const char* label; // The name of the pseudo random number generator.
nwipe_prng_init_t init; // Inialize the prng state with the seed.
nwipe_prng_read_t read; // Read data from the prng.
} nwipe_prng_t;
/* Mersenne Twister prototypes. */
int nwipe_twister_init( NWIPE_PRNG_INIT_SIGNATURE );
int nwipe_twister_read( NWIPE_PRNG_READ_SIGNATURE );
/* ISAAC prototypes. */
int nwipe_isaac_init( NWIPE_PRNG_INIT_SIGNATURE );
int nwipe_isaac_read( NWIPE_PRNG_READ_SIGNATURE );
int nwipe_isaac64_init( NWIPE_PRNG_INIT_SIGNATURE );
int nwipe_isaac64_read( NWIPE_PRNG_READ_SIGNATURE );
/* Size of the twister is not derived from the architecture, but it is strictly 4 bytes */
#define SIZE_OF_TWISTER 4
/* Size of the isaac/isaac64 is not derived from the architecture, but it is strictly 4 or 8 bytes */
#define SIZE_OF_ISAAC 4
#define SIZE_OF_ISAAC64 8
#endif /* PRNG_H_ */
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