random.h

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/*
 * Copyright (C) 2022 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef ASCON_RANDOM_H
#define ASCON_RANDOM_H
 
#include <ascon/xof.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct
{
    ascon_xof_state_t xof;
 
    uint32_t counter;
 
    uint32_t reserved;
 
} ascon_random_state_t;
 
int ascon_random(unsigned char *out, size_t outlen);
 
int ascon_random_init(ascon_random_state_t *state);
 
void ascon_random_free(ascon_random_state_t *state);
 
void ascon_random_fetch
    (ascon_random_state_t *state, unsigned char *out, size_t outlen);
 
int ascon_random_reseed(ascon_random_state_t *state);
 
void ascon_random_feed
    (ascon_random_state_t *state, const unsigned char *entropy, size_t size);
 
#ifdef __cplusplus
}
#endif
 
#endif