mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 07:18:09 +00:00
33 lines
539 B
C
33 lines
539 B
C
/*
|
|
* Copyright (c) Pavol Rusnak, SatoshiLabs
|
|
*
|
|
* Licensed under TREZOR License
|
|
* see LICENSE file for details
|
|
*/
|
|
|
|
#include "rand.h"
|
|
#include "rng.h"
|
|
|
|
uint32_t random32(void)
|
|
{
|
|
return rng_get();
|
|
}
|
|
|
|
uint32_t random_uniform(uint32_t n)
|
|
{
|
|
uint32_t x, max = 0xFFFFFFFF - (0xFFFFFFFF % n);
|
|
while ((x = random32()) >= max);
|
|
return x / (max / n);
|
|
}
|
|
|
|
void random_buffer(uint8_t *buf, size_t len)
|
|
{
|
|
uint32_t r = 0;
|
|
for (size_t i = 0; i < len; i++) {
|
|
if (i % 4 == 0) {
|
|
r = random32();
|
|
}
|
|
buf[i] = (r >> ((i % 4) * 8)) & 0xFF;
|
|
}
|
|
}
|