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trezor-firmware/legacy/firmware/reset.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 "reset.h"
#include "bip39.h"
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#include "config.h"
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#include "fsm.h"
#include "gettext.h"
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#include "layout2.h"
#include "memzero.h"
#include "messages.h"
#include "messages.pb.h"
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#include "oled.h"
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#include "protect.h"
#include "rng.h"
#include "sha2.h"
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#include "util.h"
static uint32_t strength;
static uint8_t int_entropy[32];
static bool awaiting_entropy = false;
static bool skip_backup = false;
static bool no_backup = false;
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void reset_init(uint32_t _strength, bool passphrase_protection,
bool pin_protection, const char *language, const char *label,
uint32_t u2f_counter, bool _skip_backup, bool _no_backup) {
if (_strength != 128 && _strength != 192 && _strength != 256) return;
strength = _strength;
skip_backup = _skip_backup;
no_backup = _no_backup;
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Do you really want to"), _("create a new wallet?"), NULL,
_("By continuing you"), _("agree to trezor.io/tos"), NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
layoutHome();
return;
}
random_buffer(int_entropy, 32);
if (pin_protection && !protectChangePin(false)) {
layoutHome();
return;
}
config_setPassphraseProtection(passphrase_protection);
config_setLanguage(language);
config_setLabel(label);
config_setU2FCounter(u2f_counter);
EntropyRequest resp = {0};
memzero(&resp, sizeof(EntropyRequest));
msg_write(MessageType_MessageType_EntropyRequest, &resp);
awaiting_entropy = true;
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}
void reset_entropy(const uint8_t *ext_entropy, uint32_t len) {
if (!awaiting_entropy) {
fsm_sendFailure(FailureType_Failure_UnexpectedMessage,
_("Not in Reset mode"));
return;
}
awaiting_entropy = false;
SHA256_CTX ctx = {0};
sha256_Init(&ctx);
sha256_Update(&ctx, int_entropy, 32);
sha256_Update(&ctx, ext_entropy, len);
sha256_Final(&ctx, int_entropy);
const char *mnemonic = mnemonic_from_data(int_entropy, strength / 8);
memzero(int_entropy, 32);
if (skip_backup || no_backup) {
if (no_backup) {
config_setNoBackup();
} else {
config_setNeedsBackup(true);
}
if (config_setMnemonic(mnemonic)) {
fsm_sendSuccess(_("Device successfully initialized"));
} else {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Failed to store mnemonic"));
}
layoutHome();
} else {
reset_backup(false, mnemonic);
}
mnemonic_clear();
}
static char current_word[10];
// separated == true if called as a separate workflow via BackupMessage
void reset_backup(bool separated, const char *mnemonic) {
if (separated) {
bool needs_backup = false;
config_getNeedsBackup(&needs_backup);
if (!needs_backup) {
fsm_sendFailure(FailureType_Failure_UnexpectedMessage,
_("Seed already backed up"));
return;
}
config_setUnfinishedBackup(true);
config_setNeedsBackup(false);
}
for (int pass = 0; pass < 2; pass++) {
int i = 0, word_pos = 1;
while (mnemonic[i] != 0) {
// copy current_word
int j = 0;
while (mnemonic[i] != ' ' && mnemonic[i] != 0 &&
j + 1 < (int)sizeof(current_word)) {
current_word[j] = mnemonic[i];
i++;
j++;
}
current_word[j] = 0;
if (mnemonic[i] != 0) {
i++;
}
layoutResetWord(current_word, pass, word_pos, mnemonic[i] == 0);
if (!protectButton(ButtonRequestType_ButtonRequest_ConfirmWord, true)) {
if (!separated) {
session_clear(true);
}
layoutHome();
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
return;
}
word_pos++;
}
}
config_setUnfinishedBackup(false);
if (separated) {
fsm_sendSuccess(_("Seed successfully backed up"));
} else {
config_setNeedsBackup(false);
if (config_setMnemonic(mnemonic)) {
fsm_sendSuccess(_("Device successfully initialized"));
} else {
fsm_sendFailure(FailureType_Failure_ProcessError,
_("Failed to store mnemonic"));
}
}
layoutHome();
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}
#if DEBUG_LINK
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uint32_t reset_get_int_entropy(uint8_t *entropy) {
memcpy(entropy, int_entropy, 32);
return 32;
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}
const char *reset_get_word(void) { return current_word; }
#endif