/* * 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 "random_delays.h" #include "common.h" #include "rng.h" #include "util.h" void wait_random(void) { int wait = random32() & 0xff; volatile int i = 0; volatile int j = wait; while (i < wait) { if (i + j != wait) { shutdown(); } ++i; --j; } // Double-check loop completion. if (i != wait || j != 0) { shutdown(); } }