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