90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/**************************************************************************//**
|
|
*
|
|
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2020-3-4 CHChen First version
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <rtconfig.h>
|
|
|
|
#if (defined(BSP_USING_TRNG) && defined(RT_HWCRYPTO_USING_RNG))
|
|
|
|
#include <rtdevice.h>
|
|
#include "NuMicro.h"
|
|
#include <stdlib.h>
|
|
|
|
#define NU_CRYPTO_TRNG_NAME "nu_TRNG"
|
|
|
|
/* Private variables ------------------------------------------------------------*/
|
|
static struct rt_mutex s_TRNG_mutex;
|
|
static int s_i32TRNGEnable = 0;
|
|
|
|
static rt_uint32_t nu_trng_run(void)
|
|
{
|
|
uint32_t u32RNGValue;
|
|
rt_err_t result;
|
|
|
|
result = rt_mutex_take(&s_TRNG_mutex, RT_WAITING_FOREVER);
|
|
RT_ASSERT(result == RT_EOK);
|
|
|
|
TRNG_Open();
|
|
|
|
if (TRNG_GenWord(&u32RNGValue) < 0)
|
|
{
|
|
//Failed, use software rand
|
|
u32RNGValue = rand();
|
|
}
|
|
|
|
result = rt_mutex_release(&s_TRNG_mutex);
|
|
RT_ASSERT(result == RT_EOK);
|
|
|
|
return u32RNGValue;
|
|
}
|
|
|
|
rt_err_t nu_trng_init(void)
|
|
{
|
|
rt_err_t result;
|
|
|
|
result = rt_mutex_init(&s_TRNG_mutex, NU_CRYPTO_TRNG_NAME, RT_IPC_FLAG_PRIO);
|
|
RT_ASSERT(result == RT_EOK);
|
|
|
|
if ((SYS->CSERVER & SYS_CSERVER_VERSION_Msk) == 0x0)
|
|
{
|
|
rt_kprintf("This chip does not support TRNG!\n");
|
|
return -RT_ERROR;
|
|
}
|
|
|
|
s_i32TRNGEnable = 1;
|
|
SYS_ResetModule(TRNG_RST);
|
|
return RT_EOK;
|
|
}
|
|
|
|
void nu_trng_open(void)
|
|
{
|
|
#if defined(NU_PRNG_USE_SEED)
|
|
srand(NU_PRNG_SEED_VALUE);
|
|
#else
|
|
srand(rt_tick_get());
|
|
#endif
|
|
}
|
|
|
|
rt_uint32_t nu_trng_rand(struct hwcrypto_rng *ctx)
|
|
{
|
|
if (!s_i32TRNGEnable)
|
|
{
|
|
uint32_t u32RNGValue;
|
|
//use software rand
|
|
u32RNGValue = rand();
|
|
return u32RNGValue;
|
|
}
|
|
|
|
return nu_trng_run();
|
|
}
|
|
|
|
#endif //#if (defined(BSP_USING_TRNG) && defined(RT_HWCRYPTO_USING_RNG))
|