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|
/**************************************************************************//**
* @file rng.c
* @version V3.00
* @brief Show how to get true random number.
*
* @copyright SPDX-License-Identifier: Apache-2.0
* @copyright Copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NuMicro.h"
/** @addtogroup Standard_Driver Standard Driver
@{
*/
/** @addtogroup RNG_Driver RNG Driver
@{
*/
/** @addtogroup RNG_EXPORTED_FUNCTIONS RNG Exported Functions
@{
*/
typedef enum _RNG_KEY_SIZE
{
KEY_128 = 0,
KEY_192 = 2,
KEY_224 = 3,
KEY_233 = 4,
KEY_255 = 5,
KEY_256 = 6,
KEY_283 = 7,
KEY_384 = 8,
KEY_409 = 9,
KEY_512 = 10,
KEY_521 = 11,
KEY_571 = 12
} eRNG_SZ;
/**
* @brief Open random number generator
*
* @return 0 Successful
* -1 Failed
*
* @details The function is used to disable rng interrupt.
*/
int32_t RNG_Open(void)
{
int32_t i;
int32_t timeout = 0x1000000;
/* Basic Configuration */
CLK->AHBCLK |= CLK_AHBCLK_CRPTCKEN_Msk;
CLK->APBCLK1 |= CLK_APBCLK1_TRNGCKEN_Msk;
CLK->APBCLK0 |= CLK_APBCLK0_RTCCKEN_Msk;
RTC->LXTCTL |= (RTC_LXTCTL_C32KSEL_Msk | RTC_LXTCTL_LIRC32KEN_Msk); //To use LIRC32K
TRNG->ACT |= TRNG_ACT_ACT_Msk;
/* Waiting for ready */
i = 0;
while((TRNG->CTL & TRNG_CTL_READY_Msk) == 0)
{
if(i++ > timeout)
{
/* TRNG ready timeout */
return -1;
}
}
TRNG->CTL = (0 << TRNG_CTL_CLKPSC_Pos);
/* Enable SEEDGEN */
TRNG->CTL |= (1 << 8);
/* Waiting for seed ready */
i = 0;
while((TRNG->CTL & (1 << 9)) == 0)
{
if(i++ > timeout)
{
/* seed ready timeout */
return -1;
}
}
// Waiting for PRNG busy
i = 0;
while(CRPT->PRNG_CTL & (1 << 8))
{
if(i++ > timeout)
{
/* PRNG busy timeout */
return -1;
}
}
/* Set seed select to TRNG */
CRPT->PRNG_CTL = CRPT_PRNG_CTL_SEEDSEL_Msk;
/* Waiting for seed src ok */
i = 0;
while((CRPT->PRNG_CTL & CRPT_PRNG_CTL_SEEDSRC_Msk) == 0)
{
if(i++ > timeout)
{
/* PRNG src timeout */
return -1; // Timeout
}
}
/* Reload seed only at first time */
CRPT->PRNG_CTL |= (PRNG_KEY_SIZE_256 << CRPT_PRNG_CTL_KEYSZ_Pos) | CRPT_PRNG_CTL_START_Msk | CRPT_PRNG_CTL_SEEDRLD_Msk;
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
{
/* busy timeout */
return -1;
}
}
return 0;
}
/**
* @brief Get random words
*
* @param[in] pu32Buf Buffer pointer to store the random number
*
* @param[in] nWords Buffer size in word count. nWords must <= 8
*
* @return Word count of random number in buffer
*
* @details The function is used to generate random numbers
*/
int32_t RNG_Random(uint32_t *pu32Buf, int32_t nWords)
{
int32_t i;
int32_t timeout = 0x10000;
/* Waiting for Busy */
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk) {}
if(nWords > 8)
nWords = 8;
/* Trig to generate seed 256 bits random number */
CRPT->PRNG_CTL = (6 << CRPT_PRNG_CTL_KEYSZ_Pos) | CRPT_PRNG_CTL_START_Msk;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(timeout-- < 0)
return 0;
}
for(i = 0; i < nWords; i++)
{
pu32Buf[i] = CRPT->PRNG_KEY[i];
}
return nWords;
}
/**
* @brief To generate a key to KS SRAM for ECDSA.
*
* @param[in] u32KeySize It could be PRNG_KEY_SIZE_128 ~ PRNG_KEY_SIZE_571
*
* @param[in] au32ECC_N The N value of specified ECC curve.
*
* @return -1 Failed
* Others The key number in KS SRAM
*
* @details The function is used to generate a key to KS SRAM for ECDSA.
* This key is necessary for ECDSA+Key Store function of ECC.
*/
int32_t RNG_ECDSA_Init(uint32_t u32KeySize, uint32_t au32ECC_N[18])
{
int32_t i;
int32_t timeout = 0x1000000;
/* Basic Configuration */
CLK->AHBCLK |= CLK_AHBCLK_CRPTCKEN_Msk;
CLK->APBCLK1 |= CLK_APBCLK1_TRNGCKEN_Msk;
CLK->APBCLK0 |= CLK_APBCLK0_RTCCKEN_Msk;
RTC->LXTCTL |= (RTC_LXTCTL_C32KSEL_Msk | RTC_LXTCTL_LIRC32KEN_Msk); //To use LIRC32K
TRNG->ACT |= TRNG_ACT_ACT_Msk;
/* Waiting for ready */
i = 0;
while((TRNG->CTL & TRNG_CTL_READY_Msk) == 0)
{
if(i++ > timeout)
{
return -1; // Timeout
}
}
TRNG->CTL = (0 << TRNG_CTL_CLKPSC_Pos);
/* Reset seed select of PRNG */
CRPT->PRNG_CTL = 0;
/* Enable SEEDGEN */
TRNG->CTL |= TRNG_CTL_SEEDGEN_Msk;
/* Waiting for seed ready */
i = 0;
while((TRNG->CTL & TRNG_CTL_SEEDRDY_Msk) == 0)
{
if(i++ > timeout)
{
return -1; // Timeout
}
}
// Waiting for PRNG busy
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
{
return -1; // Timeout
}
}
// Set seed select to TRNG
CRPT->PRNG_CTL = 1 << CRPT_PRNG_CTL_SEEDSEL_Pos;
// Waiting for seed src ok
i = 0;
while((CRPT->PRNG_CTL & CRPT_PRNG_CTL_SEEDSRC_Msk) == 0)
{
if(i++ > timeout)
{
return -1; // Timeout
}
}
/* It is necessary to set ECC_N for ECDSA */
for(i = 0; i < 18; i++)
CRPT->ECC_N[i] = au32ECC_N[i];
CRPT->PRNG_KSCTL = 0;
/* Reload seed only at first time */
CRPT->PRNG_CTL |= (u32KeySize << CRPT_PRNG_CTL_KEYSZ_Pos) |
CRPT_PRNG_CTL_START_Msk | CRPT_PRNG_CTL_SEEDRLD_Msk;
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
{
return -1; // Timeout
}
}
CRPT->PRNG_KSCTL = (KS_OWNER_ECC << CRPT_PRNG_KSCTL_OWNER_Pos) |
CRPT_PRNG_KSCTL_ECDSA_Msk |
(CRPT_PRNG_KSCTL_WDST_Msk) |
(KS_SRAM << CRPT_PRNG_KSCTL_WSDST_Pos);
return 0;
}
/**
* @brief To generate a key to KS SRAM for ECDSA.
*
* @return -1 Failed
* Others The key number in KS SRAM
*
* @details The function is used to generate a key to KS SRAM for ECDSA.
* This key is necessary for ECDSA+Key Store function of ECC.
*/
int32_t RNG_ECDSA(uint32_t u32KeySize)
{
int32_t timeout;
int32_t i;
/* Reload seed only at first time */
CRPT->PRNG_CTL = (u32KeySize << CRPT_PRNG_CTL_KEYSZ_Pos) |
0xc0 |
CRPT_PRNG_CTL_START_Msk;
timeout = 0x10000;
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
{
//printf("busy timeout\n");
return -1; // Timeout
}
}
if(CRPT->PRNG_KSSTS & CRPT_PRNG_KSSTS_KCTLERR_Msk)
{
//printf("KCTLERR!\n");
return -1;
}
return (CRPT->PRNG_KSSTS & CRPT_PRNG_KSCTL_NUM_Msk);
}
/**
* @brief To generate a key to KS SRAM for ECDH.
*
* @param[in] u32KeySize It could be PRNG_KEY_SIZE_128 ~ PRNG_KEY_SIZE_571
*
* @param[in] au32ECC_N The N value of specified ECC curve.
*
* @return -1 Failed
* Others The key number in KS SRAM
*
* @details The function is used to generate a key to KS SRAM for ECDH.
* This key is necessary for ECDH+Key Store function of ECC.
*/
int32_t RNG_ECDH_Init(uint32_t u32KeySize, uint32_t au32ECC_N[18])
{
int32_t i;
int32_t timeout = 0x1000000;
/* Basic Configuration */
CLK->AHBCLK |= CLK_AHBCLK_CRPTCKEN_Msk;
CLK->APBCLK1 |= CLK_APBCLK1_TRNGCKEN_Msk;
CLK->APBCLK0 |= CLK_APBCLK0_RTCCKEN_Msk;
RTC->LXTCTL |= (RTC_LXTCTL_C32KSEL_Msk | RTC_LXTCTL_LIRC32KEN_Msk); //To use LIRC32K
TRNG->ACT |= TRNG_ACT_ACT_Msk;
/* Waiting for ready */
i = 0;
while((TRNG->CTL & TRNG_CTL_READY_Msk) == 0)
{
if(i++ > timeout)
{
/* TRNG ready timeout */
return -1;
}
}
TRNG->CTL = (0 << TRNG_CTL_CLKPSC_Pos);
/* Enable SEEDGEN */
TRNG->CTL |= TRNG_CTL_SEEDGEN_Msk;
/* Waiting for seed ready */
i = 0;
while((TRNG->CTL & TRNG_CTL_SEEDRDY_Msk) == 0)
{
if(i++ > timeout)
{
/* seed ready timeout */
return -1;
}
}
/* Waiting for PRNG busy */
i = 0;
while(CRPT->PRNG_CTL & TRNG_CTL_SEEDGEN_Msk)
{
if(i++ > timeout)
{
/* PRNG busy timeout */
return -1;
}
}
/* Set seed select to TRNG */
CRPT->PRNG_CTL = (1 << 6);
// Waiting for seed src ok
i = 0;
while((CRPT->PRNG_CTL & (1 << 7)) == 0)
{
if(i++ > timeout)
{
/* PRNG src timeout */
return -1;
}
}
/* It is necessary to set ECC_N for ECDSA */
for(i = 0; i < 18; i++)
CRPT->ECC_N[i] = au32ECC_N[i];
CRPT->PRNG_KSCTL = 0;
/* Reload seed only at first time */
CRPT->PRNG_CTL |= (u32KeySize << CRPT_PRNG_CTL_KEYSZ_Pos) |
CRPT_PRNG_CTL_START_Msk | CRPT_PRNG_CTL_SEEDRLD_Msk;
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
{
/* busy timeout */
return -1;
}
}
CRPT->PRNG_KSCTL = (KS_OWNER_ECC << CRPT_PRNG_KSCTL_OWNER_Pos) |
(CRPT_PRNG_KSCTL_ECDH_Msk) |
(CRPT_PRNG_KSCTL_WDST_Msk) |
(KS_SRAM << CRPT_PRNG_KSCTL_WSDST_Pos);
return 0;
}
/**
* @brief To generate a key to KS SRAM for ECDH.
*
* @return -1 Failed
* Others The key number in KS SRAM
*
* @details The function is used to generate a key to KS SRAM for ECDH.
* This key is necessary for ECDH+Key Store function of ECC.
*/
int32_t RNG_ECDH(uint32_t u32KeySize)
{
int32_t timeout;
int32_t i;
/* Reload seed only at first time */
CRPT->PRNG_CTL = (u32KeySize << CRPT_PRNG_CTL_KEYSZ_Pos) |
0xc0 |
CRPT_PRNG_CTL_START_Msk;
timeout = 0x10000;
i = 0;
while(CRPT->PRNG_CTL & CRPT_PRNG_CTL_BUSY_Msk)
{
if(i++ > timeout)
return -1;
}
if(CRPT->PRNG_KSSTS & CRPT_PRNG_KSSTS_KCTLERR_Msk)
return -1;
return (CRPT->PRNG_KSSTS & CRPT_PRNG_KSCTL_NUM_Msk);
}
/**@}*/ /* end of group RNG_EXPORTED_FUNCTIONS */
/**@}*/ /* end of group RNG_Driver */
/**@}*/ /* end of group Standard_Driver */
|
