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trezor-firmware/legacy/firmware/pinmatrix.c

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/*
* This file is part of the Trezor project, https://trezor.io/
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*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.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 <string.h>
#include "layout2.h"
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#include "oled.h"
#include "pinmatrix.h"
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#include "rng.h"
static char pinmatrix_perm[10] = "XXXXXXXXX";
void pinmatrix_draw(const char *text) {
const BITMAP *bmp_digits[10] = {
&bmp_digit0, &bmp_digit1, &bmp_digit2, &bmp_digit3, &bmp_digit4,
&bmp_digit5, &bmp_digit6, &bmp_digit7, &bmp_digit8, &bmp_digit9,
};
layoutSwipe();
const int w = bmp_digit0.width, h = bmp_digit0.height, pad = 2;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
// use (2 - j) instead of j to achieve 789456123 layout
int k = pinmatrix_perm[i + (2 - j) * 3] - '0';
if (text) {
oledDrawStringCenter(OLED_WIDTH / 2, 0, text, FONT_STANDARD);
}
oledDrawBitmap((OLED_WIDTH - 3 * w - 2 * pad) / 2 + i * (w + pad),
OLED_HEIGHT - 3 * h - 2 * pad + j * (h + pad),
bmp_digits[k]);
}
}
for (int i = 0; i < 3; i++) {
// 36 is the maximum pixels used for a pin matrix pixel row
// but we use 56 pixels to add some extra
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oledSCAInside(12 + i * (h + pad), 12 + i * (h + pad) + h - 1, 56, 38,
OLED_WIDTH - 38);
}
oledRefresh();
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}
void pinmatrix_start(const char *text) {
for (int i = 0; i < 9; i++) {
pinmatrix_perm[i] = '1' + i;
}
pinmatrix_perm[9] = 0;
random_permute(pinmatrix_perm, 9);
pinmatrix_draw(text);
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}
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secbool pinmatrix_done(char *pin) {
int i = 0, k = 0;
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secbool ret = sectrue;
while (pin && pin[i]) {
k = pin[i] - '1';
if (k >= 0 && k <= 8) {
pin[i] = pinmatrix_perm[k];
} else {
pin[i] = 'X';
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ret = secfalse;
}
i++;
}
memset(pinmatrix_perm, 'X', sizeof(pinmatrix_perm) - 1);
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return ret;
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}
#if DEBUG_LINK
const char *pinmatrix_get(void) { return pinmatrix_perm; }
#endif