mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-22 07:28:10 +00:00
42 lines
1.1 KiB
C
42 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 "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();
|
|
}
|
|
}
|