74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup rng rng
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* @{ @ingroup crypto
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*/
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#ifndef RNG_H_
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#define RNG_H_
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typedef enum rng_quality_t rng_quality_t;
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typedef struct rng_t rng_t;
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#include <library.h>
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/**
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* Quality of generated random bytes.
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*/
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enum rng_quality_t {
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/** weak randomness, usable for nonces, IVs */
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RNG_WEAK,
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/** stronger randomness, usable for session keys */
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RNG_STRONG,
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/** true random key material */
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RNG_TRUE,
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};
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/**
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* enum name for rng_quality_t.
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*/
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extern enum_name_t *rng_quality_names;
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/**
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* Generic interface for random number generators.
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*/
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struct rng_t {
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/**
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* Generates random bytes and writes them in the buffer.
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*
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* @param len number of bytes to get
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* @param buffer pointer where the generated bytes will be written
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*/
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void (*get_bytes) (rng_t *this, size_t len, u_int8_t *buffer);
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/**
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* Generates random bytes and allocate space for them.
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*
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* @param len number of bytes to get
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* @param chunk chunk which will hold generated bytes
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*/
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void (*allocate_bytes) (rng_t *this, size_t len, chunk_t *chunk);
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/**
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* Destroys a rng object.
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*/
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void (*destroy) (rng_t *this);
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};
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#endif /** RNG_H_ @}*/
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