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trezor-firmware/embed/unix/rng.c
2018-02-26 14:07:37 +01:00

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;
}