rt-thread/bsp/bl808/m0/libraries/platform/hosal/include/hosal_rng.h

/*
 * Copyright (c) 2016-2022 Bouffalolab.
 *
 * This file is part of
 *     *** Bouffalolab Software Dev Kit ***
 *      (see www.bouffalolab.com).
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
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 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *   3. Neither the name of Bouffalo Lab nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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 */
#ifndef HAL_RNG_H
#define HAL_RNG_H

#ifdef __cplusplus
extern "C" {
#endif

/** @addtogroup hosal_rng RNG
 *  HOSAL RNG API
 *
 *  @{
 */

#include <stdint.h>

/**
 * @brief init rng
 *
 * @return  
 *     -  0 : success
 *     - other: fail
 */
int hosal_rng_init(void);

/**
 * @brief Fill in a memory buffer with random data
 *
 * @param[out]  buf          Point to a valid memory buffer, this function will fill
 *                           in this memory with random numbers after executed
 * @param[in]   bytes        Length of the memory buffer (bytes)
 *
 * @return  
 *     -  0 : success
 *     - other: fail
 */
int hosal_random_num_read(void *buf, uint32_t bytes);

/** @} */

#ifdef __cplusplus
}
#endif

#endif /* HAL_RNG_H */