mirror of
https://github.com/espressif/openthread.git
synced 2026-07-11 14:50:18 +00:00
Jonathan Hui
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2016, The OpenThread Authors.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the copyright holder nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* 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 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* This file implements true random number generator.
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include <openthread/platform/random.h>
|
|
|
|
#include "platform-da15000.h"
|
|
|
|
#include "hw_trng.h"
|
|
#include "sdk_defs.h"
|
|
|
|
#define RANDOM_SIZE_OF_BUFFER 32
|
|
|
|
static uint32_t sRandomNumbers[RANDOM_SIZE_OF_BUFFER];
|
|
static uint8_t sRandomNextNumberIndex = 0;
|
|
static bool sRandomGeneratorStarted = false;
|
|
|
|
static void RandomCallback(void)
|
|
{
|
|
hw_trng_get_numbers(sRandomNumbers, RANDOM_SIZE_OF_BUFFER);
|
|
sRandomNextNumberIndex = 0;
|
|
hw_trng_stop();
|
|
hw_trng_disable_clk();
|
|
hw_trng_disable_interrupt();
|
|
sRandomGeneratorStarted = false;
|
|
}
|
|
|
|
static void StartGenerator(void)
|
|
{
|
|
hw_trng_enable(RandomCallback);
|
|
sRandomGeneratorStarted = true;
|
|
}
|
|
|
|
void da15000RandomInit(void)
|
|
{
|
|
StartGenerator();
|
|
}
|
|
|
|
uint32_t otPlatRandomGet(void)
|
|
{
|
|
uint32_t randomNumber;
|
|
bool randomGet = false;
|
|
|
|
do
|
|
{
|
|
GLOBAL_INT_DISABLE();
|
|
|
|
if (sRandomNextNumberIndex < RANDOM_SIZE_OF_BUFFER)
|
|
{
|
|
randomNumber = sRandomNumbers[sRandomNextNumberIndex++];
|
|
randomGet = true;
|
|
|
|
if (sRandomNextNumberIndex == RANDOM_SIZE_OF_BUFFER)
|
|
{
|
|
StartGenerator();
|
|
}
|
|
}
|
|
else if (hw_trng_get_fifo_level() > 0)
|
|
{
|
|
randomNumber = hw_trng_get_number();
|
|
randomGet = true;
|
|
}
|
|
else if (!sRandomGeneratorStarted)
|
|
{
|
|
StartGenerator();
|
|
}
|
|
|
|
GLOBAL_INT_RESTORE();
|
|
} while (!randomGet);
|
|
|
|
return randomNumber;
|
|
}
|
|
|
|
otError otPlatRandomGetTrue(uint8_t *aOutput, uint16_t aOutputLength)
|
|
{
|
|
uint32_t randomNumber;
|
|
|
|
while (aOutputLength)
|
|
{
|
|
randomNumber = otPlatRandomGet();
|
|
|
|
if (aOutputLength < 4)
|
|
{
|
|
memcpy(aOutput, &randomNumber, aOutputLength);
|
|
aOutputLength = 0;
|
|
}
|
|
else
|
|
{
|
|
memcpy(aOutput, &randomNumber, 4);
|
|
aOutputLength -= 4;
|
|
aOutput += 4;
|
|
}
|
|
}
|
|
|
|
return OT_ERROR_NONE;
|
|
}
|