grain-prng.h

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/*
 * Copyright (C) 2021 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 LWCRYPTO_GRAIN_PRNG_H
#define LWCRYPTO_GRAIN_PRNG_H

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef union
{
    struct {
        unsigned char state[32]; 
        size_t rekeys; 
        size_t count;  
        size_t limit;  
    } s;               
    unsigned long long align; 
} grain_prng_state_t;

void grain_prng_add_ident(const unsigned char *data, size_t size);

int grain_prng_init(grain_prng_state_t *state);

void grain_prng_free(grain_prng_state_t *state);

int grain_prng_reseed(grain_prng_state_t *state);

void grain_prng_feed
    (grain_prng_state_t *state, const unsigned char *data, size_t size);

int grain_prng_fetch
    (grain_prng_state_t *state, unsigned char *data, size_t size);

int grain_prng_generate(unsigned char *data, size_t size);

#ifdef __cplusplus
}
#endif

#endif