ascon-select-trng.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
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 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef ASCON_SELECT_TRNG_H
#define ASCON_SELECT_TRNG_H
 
#if defined(_WIN32) || defined(__WIN32__) || defined(_WIN64) || \
    defined(__CYGWIN__) || defined(__CYGWIN32__)
 
/* Use the Windows CryptGenRandom() function */
#define ASCON_TRNG_WINDOWS 1
#define ASCON_TRNG_MIXER 1
 
#elif defined(__linux__) || defined(__APPLE__) || defined(__MACH__) || \
      defined(__FreeBSD__) || defined(__unix__) || defined(__ANDROID__) || \
      defined(__OpenBSD__)
 
/* Unix-like system with access to a /dev/urandom or /dev/random device */
#define ASCON_TRNG_DEV_RANDOM 1
#define ASCON_TRNG_MIXER 1
 
#elif defined(__zephyr__)
 
/* Zephyr RTOS.  Use the sys_csrand_get() function if it is
 * available, or use bt_rand() if Bluetooth is enabled. */
#include <zephyr/kernel.h>
#if defined(CONFIG_CTR_DRBG_CSPRNG_GENERATOR) || \
    defined(CONFIG_HARDWARE_DEVICE_CS_GENERATOR)
#define ASCON_TRNG_ZEPHYR_CSRAND 1
#elif defined(CONFIG_BT)
#define ASCON_TRNG_ZEPHYR_BTRAND 1
#else
/* Zephyr does not have a cryptographically secure RNG enabled */
#define ASCON_TRNG_NONE 1
#endif
#define ASCON_TRNG_MIXER 1
 
#elif defined(USE_HAL_DRIVER)
 
/* STM32 platform with HAL libraries.  Detecting the TRNG is complicated. */
#include "ascon-trng-stm32.h"
 
#elif defined(__arm__) && defined(__SAM3X8E__) && defined(ARDUINO)
 
/* TRNG on the Arduino Due */
#define ASCON_TRNG_DUE 1
 
#elif defined(ESP8266) || defined(ESP32)
 
/* TRNG on ESP8266 and ESP32 modules */
#define ASCON_TRNG_ESP 1
 
#else
 
/* No idea how to generate random numbers on this device yet */
#define ASCON_TRNG_NONE 1
#define ASCON_TRNG_MIXER 1
 
#endif
 
#endif