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