mirror of
https://github.com/trezor/trezor-firmware.git
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175 lines
4.6 KiB
C
175 lines
4.6 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) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "reset.h"
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#include "storage.h"
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#include "rng.h"
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#include "sha2.h"
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#include "messages.h"
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#include "fsm.h"
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#include "layout2.h"
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#include "types.pb.h"
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#include "protect.h"
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#include "bip39.h"
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#include "util.h"
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#include "gettext.h"
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static uint32_t strength;
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static uint8_t int_entropy[32];
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static bool awaiting_entropy = false;
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static bool skip_backup = false;
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void reset_init(bool display_random, uint32_t _strength, bool passphrase_protection, bool pin_protection, const char *language, const char *label, uint32_t u2f_counter, bool _skip_backup)
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{
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if (_strength != 128 && _strength != 192 && _strength != 256) return;
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strength = _strength;
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skip_backup = _skip_backup;
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random_buffer(int_entropy, 32);
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char ent_str[4][17];
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data2hex(int_entropy , 8, ent_str[0]);
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data2hex(int_entropy + 8, 8, ent_str[1]);
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data2hex(int_entropy + 16, 8, ent_str[2]);
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data2hex(int_entropy + 24, 8, ent_str[3]);
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if (display_random) {
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layoutDialogSwipe(&bmp_icon_info, _("Cancel"), _("Continue"), NULL, _("Internal entropy:"), ent_str[0], ent_str[1], ent_str[2], ent_str[3], NULL);
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if (!protectButton(ButtonRequestType_ButtonRequest_ResetDevice, false)) {
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fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
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layoutHome();
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return;
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}
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}
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if (pin_protection && !protectChangePin()) {
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fsm_sendFailure(FailureType_Failure_PinMismatch, NULL);
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layoutHome();
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return;
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}
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storage_setPassphraseProtection(passphrase_protection);
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storage_setLanguage(language);
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storage_setLabel(label);
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storage_setU2FCounter(u2f_counter);
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storage_update();
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EntropyRequest resp;
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memset(&resp, 0, sizeof(EntropyRequest));
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msg_write(MessageType_MessageType_EntropyRequest, &resp);
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awaiting_entropy = true;
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}
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void reset_entropy(const uint8_t *ext_entropy, uint32_t len)
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{
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if (!awaiting_entropy) {
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fsm_sendFailure(FailureType_Failure_UnexpectedMessage, _("Not in Reset mode"));
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return;
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}
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SHA256_CTX ctx;
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sha256_Init(&ctx);
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sha256_Update(&ctx, int_entropy, 32);
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sha256_Update(&ctx, ext_entropy, len);
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sha256_Final(&ctx, int_entropy);
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storage_setNeedsBackup(true);
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storage_setMnemonic(mnemonic_from_data(int_entropy, strength / 8));
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memset(int_entropy, 0, 32);
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awaiting_entropy = false;
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if (skip_backup) {
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storage_update();
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fsm_sendSuccess(_("Device successfully initialized"));
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layoutHome();
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} else {
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reset_backup(false);
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}
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}
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static char current_word[10];
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// separated == true if called as a separate workflow via BackupMessage
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void reset_backup(bool separated)
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{
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if (!storage_needsBackup()) {
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fsm_sendFailure(FailureType_Failure_UnexpectedMessage, _("Seed already backed up"));
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return;
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}
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storage_setUnfinishedBackup(true);
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storage_setNeedsBackup(false);
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if (separated) {
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storage_update();
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}
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const char *mnemonic = storage_getMnemonic();
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for (int pass = 0; pass < 2; pass++) {
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int i = 0, word_pos = 1;
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while (mnemonic[i] != 0) {
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// copy current_word
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int j = 0;
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while (mnemonic[i] != ' ' && mnemonic[i] != 0 && j + 1 < (int)sizeof(current_word)) {
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current_word[j] = mnemonic[i];
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i++; j++;
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}
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current_word[j] = 0;
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if (mnemonic[i] != 0) {
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i++;
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}
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layoutResetWord(current_word, pass, word_pos, mnemonic[i] == 0);
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if (!protectButton(ButtonRequestType_ButtonRequest_ConfirmWord, true)) {
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if (!separated) {
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storage_clear_update();
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session_clear(true);
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}
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layoutHome();
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fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
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return;
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}
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word_pos++;
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}
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}
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storage_setUnfinishedBackup(false);
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if (separated) {
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fsm_sendSuccess(_("Seed successfully backed up"));
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} else {
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storage_update();
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fsm_sendSuccess(_("Device successfully initialized"));
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}
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layoutHome();
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}
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#if DEBUG_LINK
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uint32_t reset_get_int_entropy(uint8_t *entropy) {
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memcpy(entropy, int_entropy, 32);
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return 32;
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}
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const char *reset_get_word(void) {
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return current_word;
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}
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#endif
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