33 lines
805 B
C
33 lines
805 B
C
// Important: RF *must* be activated on ESP board
|
|
// https://techtutorialsx.com/2017/12/22/esp32-arduino-random-number-generation/
|
|
#ifdef ESP32
|
|
#include <esp_system.h>
|
|
#endif
|
|
|
|
#ifdef ARDUINO
|
|
#include <Arduino.h>
|
|
#endif
|
|
|
|
static int
|
|
hydro_random_init(void)
|
|
{
|
|
const char ctx[hydro_hash_CONTEXTBYTES] = { 'h', 'y', 'd', 'r', 'o', 'P', 'R', 'G' };
|
|
hydro_hash_state st;
|
|
uint16_t ebits = 0;
|
|
|
|
hydro_hash_init(&st, ctx, NULL);
|
|
|
|
while (ebits < 256) {
|
|
uint32_t r = esp_random();
|
|
|
|
delay(10);
|
|
hydro_hash_update(&st, (const uint32_t *) &r, sizeof r);
|
|
ebits += 32;
|
|
}
|
|
|
|
hydro_hash_final(&st, hydro_random_context.state, sizeof hydro_random_context.state);
|
|
hydro_random_context.counter = ~LOAD64_LE(hydro_random_context.state);
|
|
|
|
return 0;
|
|
}
|