mirror of
https://github.com/martijnvanbrummelen/nwipe.git
synced 2026-02-20 13:42:14 +00:00
76ca47f2cb
Use RANDIZL=8 as recommended by ISAAC author. Fixed possible buffer overflow in nwipe_isaac_read(). Slight performance improvement.
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*
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* prng.h: Pseudo Random Number Generator abstractions for nwipe.
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*
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* Copyright Darik Horn <dajhorn-dban@vanadac.com>.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef PRNG_H_
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#define PRNG_H_
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#include <sys/types.h>
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/* A chunk of random data. */
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typedef struct
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{
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size_t length; // Length of the entropy string in bytes.
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u8* s; // The actual bytes of the entropy string.
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} nwipe_entropy_t;
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#define NWIPE_PRNG_INIT_SIGNATURE void **state, nwipe_entropy_t *seed
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#define NWIPE_PRNG_READ_SIGNATURE void **state, void *buffer, size_t count
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/* Function pointers for PRNG actions. */
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typedef int ( *nwipe_prng_init_t )( NWIPE_PRNG_INIT_SIGNATURE );
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typedef int ( *nwipe_prng_read_t )( NWIPE_PRNG_READ_SIGNATURE );
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/* The generic PRNG definition. */
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typedef struct
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{
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const char* label; // The name of the pseudo random number generator.
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nwipe_prng_init_t init; // Inialize the prng state with the seed.
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nwipe_prng_read_t read; // Read data from the prng.
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} nwipe_prng_t;
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/* Mersenne Twister prototypes. */
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int nwipe_twister_init( NWIPE_PRNG_INIT_SIGNATURE );
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int nwipe_twister_read( NWIPE_PRNG_READ_SIGNATURE );
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/* ISAAC prototypes. */
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int nwipe_isaac_init( NWIPE_PRNG_INIT_SIGNATURE );
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int nwipe_isaac_read( NWIPE_PRNG_READ_SIGNATURE );
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int nwipe_isaac64_init( NWIPE_PRNG_INIT_SIGNATURE );
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int nwipe_isaac64_read( NWIPE_PRNG_READ_SIGNATURE );
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/* Size of the twister is not derived from the architecture, but it is strictly 4 bytes */
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#define SIZE_OF_TWISTER 4
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/* Size of the isaac/isaac64 is not derived from the architecture, but it is strictly 4 or 8 bytes */
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#define SIZE_OF_ISAAC 4
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#define SIZE_OF_ISAAC64 8
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#endif /* PRNG_H_ */
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