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trezor-firmware/legacy/emulator/rng.c
2019-06-17 20:28:29 +02:00

33 lines
997 B
C

/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2017 Saleem Rashid <trezor@saleemrashid.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "rng.h"
uint32_t random32(void) {
static uint32_t last = 0;
uint32_t new;
do {
emulatorRandom(&new, sizeof(new));
} while (last == new);
last = new;
return new;
}