trezor-firmware/firmware/fsm_msg_common.h

void fsm_msgInitialize(Initialize *msg)
{
	recovery_abort();
	signing_abort();
	if (msg && msg->has_state && msg->state.size == 64) {
		uint8_t i_state[64];
		if (!session_getState(msg->state.bytes, i_state, NULL)) {
			session_clear(false); // do not clear PIN
		} else {
			if (0 != memcmp(msg->state.bytes, i_state, 64)) {
				session_clear(false); // do not clear PIN
			}
		}
	} else {
		session_clear(false); // do not clear PIN
	}
	layoutHome();
	fsm_msgGetFeatures(0);
}

void fsm_msgGetFeatures(GetFeatures *msg)
{
	(void)msg;
	RESP_INIT(Features);
	resp->has_vendor = true;         strlcpy(resp->vendor, "bitcointrezor.com", sizeof(resp->vendor));
	resp->has_major_version = true;  resp->major_version = VERSION_MAJOR;
	resp->has_minor_version = true;  resp->minor_version = VERSION_MINOR;
	resp->has_patch_version = true;  resp->patch_version = VERSION_PATCH;
	resp->has_device_id = true;      strlcpy(resp->device_id, storage_uuid_str, sizeof(resp->device_id));
	resp->has_pin_protection = true; resp->pin_protection = storage_hasPin();
	resp->has_passphrase_protection = true; resp->passphrase_protection = storage_hasPassphraseProtection();
#ifdef SCM_REVISION
	int len = sizeof(SCM_REVISION) - 1;
	resp->has_revision = true; memcpy(resp->revision.bytes, SCM_REVISION, len); resp->revision.size = len;
#endif
	resp->has_bootloader_hash = true; resp->bootloader_hash.size = memory_bootloader_hash(resp->bootloader_hash.bytes);
	if (storage_getLanguage()) {
		resp->has_language = true;
		strlcpy(resp->language, storage_getLanguage(), sizeof(resp->language));
	}
	if (storage_getLabel()) {
		resp->has_label = true;
		strlcpy(resp->label, storage_getLabel(), sizeof(resp->label));
	}
	
	_Static_assert(pb_arraysize(Features, coins) >= COINS_COUNT, "Features.coins max_count not large enough");

	resp->coins_count = COINS_COUNT;
	for (int i = 0; i < COINS_COUNT; i++) {
		if (coins[i].coin_name) {
			resp->coins[i].has_coin_name = true;
			strlcpy(resp->coins[i].coin_name, coins[i].coin_name, sizeof(resp->coins[i].coin_name));
		}
		if (coins[i].coin_shortcut) {
			resp->coins[i].has_coin_shortcut = true;
			strlcpy(resp->coins[i].coin_shortcut, coins[i].coin_shortcut + 1, sizeof(resp->coins[i].coin_shortcut));
		}
		resp->coins[i].has_address_type = coins[i].has_address_type;
		resp->coins[i].address_type = coins[i].address_type;
		resp->coins[i].has_maxfee_kb = true;
		resp->coins[i].maxfee_kb = coins[i].maxfee_kb;
		resp->coins[i].has_address_type_p2sh = coins[i].has_address_type_p2sh;
		resp->coins[i].address_type_p2sh = coins[i].address_type_p2sh;
		resp->coins[i].has_xpub_magic = coins[i].xpub_magic != 0;
		resp->coins[i].xpub_magic = coins[i].xpub_magic;
		resp->coins[i].has_xprv_magic = coins[i].xprv_magic != 0;
		resp->coins[i].xprv_magic = coins[i].xprv_magic;
		resp->coins[i].has_segwit = true;
		resp->coins[i].segwit = coins[i].has_segwit;
		resp->coins[i].has_forkid = coins[i].has_forkid;
		resp->coins[i].forkid = coins[i].forkid;
		resp->coins[i].has_force_bip143 = true;
		resp->coins[i].force_bip143 = coins[i].force_bip143;
	}
	resp->has_initialized = true; resp->initialized = storage_isInitialized();
	resp->has_imported = true; resp->imported = storage_isImported();
	resp->has_pin_cached = true; resp->pin_cached = session_isPinCached();
	resp->has_passphrase_cached = true; resp->passphrase_cached = session_isPassphraseCached();
	resp->has_needs_backup = true; resp->needs_backup = storage_needsBackup();
	resp->unfinished_backup = true; resp->unfinished_backup = storage_unfinishedBackup();
	resp->has_flags = true; resp->flags = storage_getFlags();
	resp->has_model = true; strlcpy(resp->model, "1", sizeof(resp->model));

	msg_write(MessageType_MessageType_Features, resp);
}

void fsm_msgPing(Ping *msg)
{
	RESP_INIT(Success);

	if (msg->has_button_protection && msg->button_protection) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("answer to ping?"), NULL, NULL, NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}

	if (msg->has_pin_protection && msg->pin_protection) {
		CHECK_PIN
	}

	if (msg->has_passphrase_protection && msg->passphrase_protection) {
		if (!protectPassphrase()) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			return;
		}
	}

	if (msg->has_message) {
		resp->has_message = true;
		memcpy(&(resp->message), &(msg->message), sizeof(resp->message));
	}
	msg_write(MessageType_MessageType_Success, resp);
	layoutHome();
}

void fsm_msgChangePin(ChangePin *msg)
{
	bool removal = msg->has_remove && msg->remove;
	if (removal) {
		if (storage_hasPin()) {
			layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("remove current PIN?"), NULL, NULL, NULL, NULL);
		} else {
			fsm_sendSuccess(_("PIN removed"));
			return;
		}
	} else {
		if (storage_hasPin()) {
			layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("change current PIN?"), NULL, NULL, NULL, NULL);
		} else {
			layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("set new PIN?"), NULL, NULL, NULL, NULL);
		}
	}
	if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
		fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
		layoutHome();
		return;
	}

	CHECK_PIN_UNCACHED

	if (removal) {
		storage_setPin("");
		storage_update();
		fsm_sendSuccess(_("PIN removed"));
	} else {
		if (protectChangePin()) {
			fsm_sendSuccess(_("PIN changed"));
		} else {
			fsm_sendFailure(FailureType_Failure_PinMismatch, NULL);
		}
	}
	layoutHome();
}

void fsm_msgWipeDevice(WipeDevice *msg)
{
	(void)msg;
	layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("wipe the device?"), NULL, _("All data will be lost."), NULL, NULL);
	if (!protectButton(ButtonRequestType_ButtonRequest_WipeDevice, false)) {
		fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
		layoutHome();
		return;
	}
	storage_wipe();
	// the following does not work on Mac anyway :-/ Linux/Windows are fine, so it is not needed
	// usbReconnect(); // force re-enumeration because of the serial number change
	fsm_sendSuccess(_("Device wiped"));
	layoutHome();
}

void fsm_msgGetEntropy(GetEntropy *msg)
{
#if !DEBUG_RNG
	layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("send entropy?"), NULL, NULL, NULL, NULL);
	if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
		fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
		layoutHome();
		return;
	}
#endif
	RESP_INIT(Entropy);
	uint32_t len = msg->size;
	if (len > 1024) {
		len = 1024;
	}
	resp->entropy.size = len;
	random_buffer(resp->entropy.bytes, len);
	msg_write(MessageType_MessageType_Entropy, resp);
	layoutHome();
}

void fsm_msgLoadDevice(LoadDevice *msg)
{
	CHECK_NOT_INITIALIZED

	layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("I take the risk"), NULL, _("Loading private seed"), _("is not recommended."), _("Continue only if you"), _("know what you are"), _("doing!"), NULL);
	if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
		fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
		layoutHome();
		return;
	}

	if (msg->has_mnemonic && !(msg->has_skip_checksum && msg->skip_checksum) ) {
		if (!mnemonic_check(msg->mnemonic)) {
			fsm_sendFailure(FailureType_Failure_DataError, _("Mnemonic with wrong checksum provided"));
			layoutHome();
			return;
		}
	}

	storage_loadDevice(msg);
	fsm_sendSuccess(_("Device loaded"));
	layoutHome();
}

void fsm_msgResetDevice(ResetDevice *msg)
{
	CHECK_NOT_INITIALIZED

	CHECK_PARAM(!msg->has_strength || msg->strength == 128 || msg->strength == 192 || msg->strength == 256, _("Invalid seed strength"));

	reset_init(
		msg->has_display_random && msg->display_random,
		msg->has_strength ? msg->strength : 128,
		msg->has_passphrase_protection && msg->passphrase_protection,
		msg->has_pin_protection && msg->pin_protection,
		msg->has_language ? msg->language : 0,
		msg->has_label ? msg->label : 0,
		msg->has_u2f_counter ? msg->u2f_counter : 0,
		msg->has_skip_backup ? msg->skip_backup : false
	);
}

void fsm_msgEntropyAck(EntropyAck *msg)
{
	if (msg->has_entropy) {
		reset_entropy(msg->entropy.bytes, msg->entropy.size);
	} else {
		reset_entropy(0, 0);
	}
}

void fsm_msgBackupDevice(BackupDevice *msg)
{
	CHECK_INITIALIZED

	CHECK_PIN_UNCACHED

	(void)msg;
	reset_backup(true);
}

void fsm_msgCancel(Cancel *msg)
{
	(void)msg;
	recovery_abort();
	signing_abort();
	ethereum_signing_abort();
	fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
}

void fsm_msgClearSession(ClearSession *msg)
{
	(void)msg;
	session_clear(true); // clear PIN as well
	layoutScreensaver();
	fsm_sendSuccess(_("Session cleared"));
}

void fsm_msgApplySettings(ApplySettings *msg)
{
	CHECK_PARAM(msg->has_label || msg->has_language || msg->has_use_passphrase || msg->has_homescreen || msg->has_auto_lock_delay_ms,
				_("No setting provided"));

	CHECK_PIN

	if (msg->has_label) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("change name to"), msg->label, "?", NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}
	if (msg->has_language) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("change language to"), msg->language, "?", NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}
	if (msg->has_use_passphrase) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), msg->use_passphrase ? _("enable passphrase") : _("disable passphrase"), _("encryption?"), NULL, NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}
	if (msg->has_homescreen) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("change the home"), _("screen?"), NULL, NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}

	if (msg->has_auto_lock_delay_ms) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("change auto-lock"), _("delay?"), NULL, NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}

	if (msg->has_label) {
		storage_setLabel(msg->label);
	}
	if (msg->has_language) {
		storage_setLanguage(msg->language);
	}
	if (msg->has_use_passphrase) {
		storage_setPassphraseProtection(msg->use_passphrase);
	}
	if (msg->has_homescreen) {
		storage_setHomescreen(msg->homescreen.bytes, msg->homescreen.size);
	}
	if (msg->has_auto_lock_delay_ms) {
		storage_setAutoLockDelayMs(msg->auto_lock_delay_ms);
	}
	storage_update();
	fsm_sendSuccess(_("Settings applied"));
	layoutHome();
}

void fsm_msgApplyFlags(ApplyFlags *msg)
{
	if (msg->has_flags) {
		storage_applyFlags(msg->flags);
		storage_update();
	}
	fsm_sendSuccess(_("Flags applied"));
}

void fsm_msgRecoveryDevice(RecoveryDevice *msg)
{
	const bool dry_run = msg->has_dry_run ? msg->dry_run : false;
	if (dry_run) {
		CHECK_PIN
	} else {
		CHECK_NOT_INITIALIZED
	}

	CHECK_PARAM(!msg->has_word_count || msg->word_count == 12 || msg->word_count == 18 || msg->word_count == 24, _("Invalid word count"));

	if (!dry_run) {
		layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you really want to"), _("recover the device?"), NULL, NULL, NULL, NULL);
		if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return;
		}
	}

	recovery_init(
		msg->has_word_count ? msg->word_count : 12,
		msg->has_passphrase_protection && msg->passphrase_protection,
		msg->has_pin_protection && msg->pin_protection,
		msg->has_language ? msg->language : 0,
		msg->has_label ? msg->label : 0,
		msg->has_enforce_wordlist && msg->enforce_wordlist,
		msg->has_type ? msg->type : 0,
		msg->has_u2f_counter ? msg->u2f_counter : 0,
		dry_run
	);
}

void fsm_msgWordAck(WordAck *msg)
{
	recovery_word(msg->word);
}

void fsm_msgSetU2FCounter(SetU2FCounter *msg)
{
	layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL, _("Do you want to set"), _("the U2F counter?"), NULL, NULL, NULL, NULL);
	if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
		fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
		layoutHome();
		return;
	}
	storage_setU2FCounter(msg->u2f_counter);
	storage_update();
	fsm_sendSuccess(_("U2F counter set"));
	layoutHome();
}