27 lines
842 B
C
27 lines
842 B
C
|
// Note: All particle platforms except for the Spark Core have a HW RNG. Only allow building on
|
||
|
// supported platforms for now. PLATFORM_ID definitions:
|
||
|
// https://github.com/particle-iot/device-os/blob/mesh-develop/hal/shared/platforms.h
|
||
|
|
||
|
#include <Particle.h>
|
||
|
|
||
|
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 = HAL_RNG_GetRandomNumber();
|
||
|
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;
|
||
|
}
|