mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-30 10:08:18 +00:00
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/*
|
|
* This file is part of the Trezor project, https://trezor.io/
|
|
*
|
|
* Copyright (c) SatoshiLabs
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "common.h"
|
|
#include "rng.h"
|
|
|
|
uint32_t rng_get(void) {
|
|
static FILE *frand = NULL;
|
|
if (!frand) {
|
|
frand = fopen("/dev/urandom", "r");
|
|
}
|
|
ensure(sectrue * (frand != NULL), "fopen failed");
|
|
uint32_t r;
|
|
ensure(sectrue * (sizeof(r) == fread(&r, 1, sizeof(r), frand)),
|
|
"fread failed");
|
|
return r;
|
|
}
|