flipperzero-firmware/firmware/targets/f7/furi_hal/furi_hal_random.c

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#include "furi_hal_random.h"
#include <furi.h>
#include <furi_hal.h>
#include <stm32wbxx_ll_rng.h>
#include <stm32wbxx_ll_hsem.h>
#include <hw_conf.h>
#define TAG "FuriHalRandom"
uint32_t furi_hal_random_get() {
while(LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID))
;
LL_RNG_Enable(RNG);
while(!LL_RNG_IsActiveFlag_DRDY(RNG))
;
if((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
furi_crash("TRNG error");
}
uint32_t random_val = LL_RNG_ReadRandData32(RNG);
LL_RNG_Disable(RNG);
LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
return random_val;
}
void furi_hal_random_fill_buf(uint8_t* buf, uint32_t len) {
while(LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID))
;
LL_RNG_Enable(RNG);
for(uint32_t i = 0; i < len; i += 4) {
while(!LL_RNG_IsActiveFlag_DRDY(RNG))
;
if((LL_RNG_IsActiveFlag_CECS(RNG)) || (LL_RNG_IsActiveFlag_SECS(RNG))) {
furi_crash("TRNG error");
}
uint32_t random_val = LL_RNG_ReadRandData32(RNG);
uint8_t len_cur = ((i + 4) < len) ? (4) : (len - i);
memcpy(&buf[i], &random_val, len_cur);
}
LL_RNG_Disable(RNG);
LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
}
void srand(unsigned seed) {
UNUSED(seed);
}
int rand() {
return (furi_hal_random_get() & RAND_MAX);
}
long random() {
return (furi_hal_random_get() & RAND_MAX);
}