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/**************************************************************************//**
* @file trng.c
* @version V3.00
* @brief M460 series TRNG driver source file
*
* @copyright SPDX-License-Identifier: Apache-2.0
* @copyright Copyright (C) 2021 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NuMicro.h"
/** @addtogroup Standard_Driver Standard Driver
@{
*/
/** @addtogroup TRNG_Driver TRNG Driver
@{
*/
/** @addtogroup TRNG_EXPORTED_FUNCTIONS TRNG Exported Functions
@{
*/
/**
* @brief Initialize TRNG hardware.
* @return TRNG hardware enable success or failed.
* @retval 0 Success
* @retval -1 Time-out. TRNG hardware may not be enabled.
*/
int32_t TRNG_Open(void)
{
uint32_t u32TimeOutCount = SystemCoreClock; /* 1 second time-out */
SYS->IPRST1 |= SYS_IPRST1_TRNGRST_Msk;
SYS->IPRST1 ^= SYS_IPRST1_TRNGRST_Msk;
TRNG->CTL |= TRNG_CTL_TRNGEN_Msk;
TRNG->ACT |= TRNG_ACT_ACT_Msk;
/* Waiting for ready */
while ((TRNG->CTL & TRNG_CTL_READY_Msk) == 0)
{
if (--u32TimeOutCount == 0) return -1; /* Time-out error */
}
return 0;
}
/**
* @brief Generate a 32-bits random number word.
* @param[out] u32RndNum The output 32-bits word random number.
*
* @return Success or time-out.
* @retval 0 Success
* @retval -1 Time-out. TRNG hardware may not be enabled.
*/
int32_t TRNG_GenWord(uint32_t *u32RndNum)
{
uint32_t i, u32Reg, timeout;
*u32RndNum = 0;
u32Reg = TRNG->CTL;
for (i = 0; i < 4; i++)
{
TRNG->CTL = TRNG_CTL_TRNGEN_Msk | u32Reg;
/* TRNG should generate one byte per 125*8 us */
for (timeout = (CLK_GetHCLKFreq() / 100); timeout > 0; timeout--)
{
if (TRNG->CTL & TRNG_CTL_DVIF_Msk)
break;
}
if (timeout == 0)
return -1;
*u32RndNum |= ((TRNG->DATA & 0xff) << i * 8);
}
return 0;
}
/**
* @brief Generate a big number in binary format.
* @param[out] u8BigNum The output big number.
* @param[in] i32Len Request bit length of the output big number. It must be multiple of 8.
*
* @return Success or time-out.
* @retval 0 Success
* @retval -1 Time-out. TRNG hardware may not be enabled.
*/
int32_t TRNG_GenBignum(uint8_t u8BigNum[], int32_t i32Len)
{
uint32_t i, u32Reg, timeout;
u32Reg = TRNG->CTL;
for (i = 0; i < i32Len / 8; i++)
{
TRNG->CTL = TRNG_CTL_TRNGEN_Msk | u32Reg;
/* TRNG should generate one byte per 125*8 us */
for (timeout = (CLK_GetHCLKFreq() / 100); timeout > 0; timeout--)
{
if (TRNG->CTL & TRNG_CTL_DVIF_Msk)
break;
}
if (timeout == 0)
return -1;
u8BigNum[i] = (TRNG->DATA & 0xff);
}
return 0;
}
/**
* @brief Generate a big number in hex format.
* @param[out] cBigNumHex The output hex format big number.
* @param[in] i32Len Request bit length of the output big number. It must be multiple of 8.
*
* @return Success or time-out.
* @retval 0 Success
* @retval -1 Time-out. TRNG hardware may not be enabled.
*/
int32_t TRNG_GenBignumHex(char cBigNumHex[], int32_t i32Len)
{
uint32_t i, idx, u32Reg, timeout;
uint32_t data;
u32Reg = TRNG->CTL;
idx = 0;
for (i = 0; i < i32Len / 8; i++)
{
TRNG->CTL = TRNG_CTL_TRNGEN_Msk | u32Reg;
/* TRNG should generate one byte per 125*8 us */
for (timeout = (CLK_GetHCLKFreq() / 100); timeout > 0; timeout--)
{
if (TRNG->CTL & TRNG_CTL_DVIF_Msk)
break;
}
if (timeout == 0)
return -1;
data = (TRNG->DATA & 0xff);
if (data >= 0xA0)
cBigNumHex[idx++] = ((data >> 4) & 0xf) - 10 + 'A';
else
cBigNumHex[idx++] = ((data >> 4) & 0xf) + '0';
data &= 0xf;
if (data >= 0xA)
cBigNumHex[idx++] = data - 10 + 'A';
else
cBigNumHex[idx++] = data + '0';
}
cBigNumHex[idx] = 0;
return 0;
}
/*@}*/ /* end of group TRNG_EXPORTED_FUNCTIONS */
/*@}*/ /* end of group TRNG_Driver */
/*@}*/ /* end of group Standard_Driver */
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