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/* Copyright 2015 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __EC_INCLUDE_TRNG_H
#define __EC_INCLUDE_TRNG_H
#include <stddef.h>
#include <stdint.h>
#include <common.h>
#ifdef CONFIG_ZEPHYR
/*
* Zephyr driver is responsible for initializing, enabling and disabling
* hardware. In this case, trng_init() and trng_exit() does nothing.
*/
#define trng_init()
#define trng_exit()
#else
/**
* Initialize the true random number generator.
*
* Not supported by all platforms.
**/
void trng_init(void);
/**
* Shutdown the true random number generator.
*
* The opposite operation of trng_init(), disable the hardware resources
* used by the TRNG to save power.
*
* Not supported by all platforms.
**/
void trng_exit(void);
#endif /* CONFIG_ZEPHYR */
/**
* Output len random bytes into buffer.
*
* Not supported on all platforms.
**/
void trng_rand_bytes(void *buffer, size_t len);
#endif /* __EC_INCLUDE_TRNG_H */
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