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Add the possibility to export private view key for fast scan.

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On client startup the device asks for authorization to export the private view key.
If user agree, the client hold the private view key allowing a fast blockchain scan.
If the user does not agree, the blockchain scan is fully done via the device.
pull/88/head
cslashm 6 years ago
parent da5de484f2
commit 0f3ff8ce2c
7 changed files with 200 additions and 93 deletions
Show Stats Download Patch File Download Diff File

22
src/device/device.hpp
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@ -78,6 +78,7 @@ namespace hw {
return false;
}
class device {
protected:
std::string name;
@ -89,10 +90,12 @@ namespace hw {
virtual ~device() {}
explicit virtual operator bool() const = 0;
static const int SIGNATURE_REAL = 0;
static const int SIGNATURE_FAKE = 1;
enum device_mode {
NONE,
TRANSACTION_CREATE_REAL,
TRANSACTION_CREATE_FAKE,
TRANSACTION_PARSE
};
/* ======================================================================= */
/* SETUP/TEARDOWN */
@ -106,6 +109,9 @@ namespace hw {
virtual bool connect(void) = 0;
virtual bool disconnect(void) = 0;
virtual bool set_mode(device_mode mode) = 0;
/* ======================================================================= */
/* LOCKER */
/* ======================================================================= */
@ -166,8 +172,6 @@ namespace hw {
virtual bool open_tx(crypto::secret_key &tx_key) = 0;
virtual bool set_signature_mode(unsigned int sig_mode) = 0;
virtual bool encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) = 0;
bool decrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key)
{
@ -191,6 +195,12 @@ namespace hw {
virtual bool close_tx(void) = 0;
} ;
struct reset_mode {
device& hwref;
reset_mode(hw::device& dev) : hwref(dev) { }
~reset_mode() { hwref.set_mode(hw::device::NONE);}
};
device& get_device(const std::string device_descriptor) ;
}

7
src/device/device_default.cpp
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@ -81,6 +81,9 @@ namespace hw {
dfns();
}
bool device_default::set_mode(device_mode mode) {
return true;
}
/* ======================================================================= */
/* LOCKER */
@ -273,10 +276,6 @@ namespace hw {
return true;
}
bool device_default::set_signature_mode(unsigned int sig_mode) {
return true;
}
bool device_default::encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) {
crypto::key_derivation derivation;
crypto::hash hash;

5
src/device/device_default.hpp
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@ -58,6 +58,8 @@ namespace hw {
bool connect(void) override;
bool disconnect() override;
bool set_mode(device_mode mode) override;
/* ======================================================================= */
/* LOCKER */
@ -104,9 +106,6 @@ namespace hw {
bool open_tx(crypto::secret_key &tx_key) override;
//bool get_additional_key(const bool subaddr, cryptonote::keypair &additional_txkey) override;
bool set_signature_mode(unsigned int sig_mode) override;
bool encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) override;
bool ecdhEncode(rct::ecdhTuple & unmasked, const rct::key & sharedSec) override;

171
src/device/device_ledger.cpp
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@ -58,8 +58,8 @@ namespace hw {
#define ASSERT_T0(exp) CHECK_AND_ASSERT_THROW_MES(exp, "Protocol assert failure: "#exp ) ;
#ifdef DEBUG_HWDEVICE
crypto::secret_key viewkey;
crypto::secret_key spendkey;
crypto::secret_key dbg_viewkey;
crypto::secret_key dbg_spendkey;
#endif
/* ===================================================================== */
@ -119,7 +119,14 @@ namespace hw {
#endif
/* ===================================================================== */
/* === Device ==== */
/* === Internal Helpers ==== */
/* ===================================================================== */
static bool is_fake_view_key(const crypto::secret_key &sec) {
return sec == crypto::null_skey;
}
/* ===================================================================== */
/* === Device ==== */
/* ===================================================================== */
static int device_id = 0;
@ -197,6 +204,8 @@ namespace hw {
this->hCard = 0;
this->hContext = 0;
this->reset_buffer();
this->mode = NONE;
this->has_view_key = false;
MDEBUG( "Device "<<this->id <<" Created");
}
@ -403,10 +412,10 @@ namespace hw {
#ifdef DEBUG_HWDEVICE
cryptonote::account_public_address pubkey;
this->get_public_address(pubkey);
#endif
crypto::secret_key vkey;
crypto::secret_key skey;
this->get_secret_keys(vkey,skey);
#endif
return rv==SCARD_S_SUCCESS;
}
@ -420,6 +429,47 @@ namespace hw {
return true;
}
bool device_ledger::set_mode(device_mode mode) {
AUTO_LOCK_CMD();
int offset;
reset_buffer();
switch(mode) {
case TRANSACTION_CREATE_REAL:
case TRANSACTION_CREATE_FAKE:
this->buffer_send[0] = 0x00;
this->buffer_send[1] = INS_SET_SIGNATURE_MODE;
this->buffer_send[2] = 0x01;
this->buffer_send[3] = 0x00;
this->buffer_send[4] = 0x00;
offset = 5;
//options
this->buffer_send[offset] = 0x00;
offset += 1;
//account
this->buffer_send[offset] = mode;
offset += 1;
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
this->mode = mode;
break;
case TRANSACTION_PARSE:
case NONE:
this->mode = mode;
break;
default:
CHECK_AND_ASSERT_THROW_MES(false, " device_ledger::set_mode(unsigned int mode): invalid mode: "<<mode);
}
MDEBUG("Switch to mode: " <<mode);
return true;
}
/* ======================================================================= */
/* WALLET & ADDRESS */
@ -451,12 +501,13 @@ namespace hw {
return true;
}
bool device_ledger::get_secret_keys(crypto::secret_key &viewkey , crypto::secret_key &spendkey) {
bool device_ledger::get_secret_keys(crypto::secret_key &vkey , crypto::secret_key &skey) {
AUTO_LOCK_CMD();
memset(viewkey.data, 0x00, 32);
memset(spendkey.data, 0xFF, 32);
#ifdef DEBUG_HWDEVICE
//secret key are represented as fake key on the wallet side
memset(vkey.data, 0x00, 32);
memset(skey.data, 0xFF, 32);
//spcialkey, normal conf handled in decrypt
int offset;
reset_buffer();
@ -475,12 +526,22 @@ namespace hw {
this->length_send = offset;
this->exchange();
//clear key
memmove(ledger::viewkey.data, this->buffer_recv+64, 32);
memmove(ledger::spendkey.data, this->buffer_recv+96, 32);
//View key is retrievied, if allowed, to speed up blockchain parsing
memmove(this->viewkey.data, this->buffer_recv+0, 32);
if (is_fake_view_key(this->viewkey)) {
MDEBUG("Have Not view key");
this->has_view_key = false;
} else {
MDEBUG("Have view key");
this->has_view_key = true;
}
#ifdef DEBUG_HWDEVICE
memmove(dbg_viewkey.data, this->buffer_recv+0, 32);
memmove(dbg_spendkey.data, this->buffer_recv+32, 32);
#endif
#endif
return true;
return true;
}
bool device_ledger::generate_chacha_key(const cryptonote::account_keys &keys, crypto::chacha_key &key) {
@ -525,11 +586,14 @@ namespace hw {
bool device_ledger::derive_subaddress_public_key(const crypto::public_key &pub, const crypto::key_derivation &derivation, const std::size_t output_index, crypto::public_key &derived_pub){
AUTO_LOCK_CMD();
int offset;
#ifdef DEBUG_HWDEVICE
const crypto::public_key pub_x = pub;
const crypto::key_derivation derivation_x = hw::ledger::decrypt(derivation);
crypto::key_derivation derivation_x;
if ((this->mode == TRANSACTION_PARSE) && has_view_key) {
derivation_x = derivation;
} else {
derivation_x = hw::ledger::decrypt(derivation);
}
const std::size_t output_index_x = output_index;
crypto::public_key derived_pub_x;
hw::ledger::log_hexbuffer("derive_subaddress_public_key: [[IN]] pub ", pub_x.data, 32);
@ -539,6 +603,15 @@ namespace hw {
hw::ledger::log_hexbuffer("derive_subaddress_public_key: [[OUT]] derived_pub", derived_pub_x.data, 32);
#endif
if ((this->mode == TRANSACTION_PARSE) && has_view_key) {
//If we are in TRANSACTION_PARSE, the given derivation has been retrieved uncrypted (wihtout the help
//of the device), so continue that way.
MDEBUG( "derive_subaddress_public_key : PARSE mode with known viewkey");
crypto::derive_subaddress_public_key(pub, derivation, output_index,derived_pub);
} else {
int offset =0;
reset_buffer();
this->buffer_send[0] = 0x00;
@ -569,10 +642,10 @@ namespace hw {
//pub key
memmove(derived_pub.data, &this->buffer_recv[0], 32);
#ifdef DEBUG_HWDEVICE
hw::ledger::check32("derive_subaddress_public_key", "derived_pub", derived_pub_x.data, derived_pub.data);
#endif
}
#ifdef DEBUG_HWDEVICE
hw::ledger::check32("derive_subaddress_public_key", "derived_pub", derived_pub_x.data, derived_pub.data);
#endif
return true;
}
@ -959,7 +1032,7 @@ namespace hw {
bool device_ledger::generate_key_derivation(const crypto::public_key &pub, const crypto::secret_key &sec, crypto::key_derivation &derivation) {
AUTO_LOCK_CMD();
int offset;
bool r = false;
#ifdef DEBUG_HWDEVICE
const crypto::public_key pub_x = pub;
@ -971,6 +1044,17 @@ namespace hw {
hw::ledger::log_hexbuffer("generate_key_derivation: [[OUT]] derivation", derivation_x.data, 32);
#endif
if ((this->mode == TRANSACTION_PARSE) && has_view_key) {
//A derivation is resquested in PASRE mode and we have the view key,
//so do that wihtout the device and return the derivation unencrypted.
MDEBUG( "generate_key_derivation : PARSE mode with known viewkey");
//Note derivation in PARSE mode can only happen with viewkey, so assert it!
assert(is_fake_view_key(sec));
r = crypto::generate_key_derivation(pub, this->viewkey, derivation);
} else {
int offset;
reset_buffer();
this->buffer_send[0] = 0x00;
@ -995,14 +1079,19 @@ namespace hw {
//derivattion data
memmove(derivation.data, &this->buffer_recv[0], 32);
r = true;
}
#ifdef DEBUG_HWDEVICE
crypto::key_derivation derivation_clear ;
if ((this->mode == TRANSACTION_PARSE) && has_view_key) {
derivation_clear = derivation;
}else {
derivation_clear = hw::ledger::decrypt(derivation);
}
hw::ledger::check32("generate_key_derivation", "derivation", derivation_x.data, derivation_clear.data);
#endif
#ifdef DEBUG_HWDEVICE
crypto::key_derivation derivation_clear = hw::ledger::decrypt(derivation);
hw::ledger::check32("generate_key_derivation", "derivation", derivation_x.data, derivation_clear.data);
#endif
return true;
return r;
}
bool device_ledger::derivation_to_scalar(const crypto::key_derivation &derivation, const size_t output_index, crypto::ec_scalar &res) {
@ -1290,32 +1379,6 @@ namespace hw {
return true;
}
bool device_ledger::set_signature_mode(unsigned int sig_mode) {
AUTO_LOCK_CMD();
int offset ;
reset_buffer();
this->buffer_send[0] = 0x00;
this->buffer_send[1] = INS_SET_SIGNATURE_MODE;
this->buffer_send[2] = 0x01;
this->buffer_send[3] = 0x00;
this->buffer_send[4] = 0x00;
offset = 5;
//options
this->buffer_send[offset] = 0x00;
offset += 1;
//account
this->buffer_send[offset] = sig_mode;
offset += 1;
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
return true;
}
bool device_ledger::encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) {
AUTO_LOCK_CMD();
int offset;

23
src/device/device_ledger.hpp
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@ -32,7 +32,6 @@
#include <cstddef>
#include <string>
#include <mutex>
#include "device.hpp"
#include <PCSC/winscard.h>
#include <PCSC/wintypes.h>
@ -94,15 +93,21 @@ namespace hw {
DWORD length_recv;
BYTE buffer_recv[BUFFER_RECV_SIZE];
unsigned int id;
Keymap key_map;
void logCMD(void);
void logRESP(void);
unsigned int exchange(unsigned int ok=0x9000, unsigned int mask=0xFFFF);
void reset_buffer(void);
// hw running mode
device_mode mode;
// map public destination key to ephemeral destination key
Keymap key_map;
// To speed up blockchain parsing the view key maybe handle here.
crypto::secret_key viewkey;
bool has_view_key;
//extra debug
#ifdef DEBUG_HWDEVICE
device *controle_device;
#endif
@ -129,6 +134,7 @@ namespace hw {
bool connect(void) override;
bool disconnect() override;
bool set_mode(device_mode mode) override;
/* ======================================================================= */
/* LOCKER */
@ -175,8 +181,6 @@ namespace hw {
bool open_tx(crypto::secret_key &tx_key) override;
bool set_signature_mode(unsigned int sig_mode) override;
bool encrypt_payment_id(crypto::hash8 &payment_id, const crypto::public_key &public_key, const crypto::secret_key &secret_key) override;
bool ecdhEncode(rct::ecdhTuple & unmasked, const rct::key & sharedSec) override;
@ -197,10 +201,9 @@ namespace hw {
};
#ifdef DEBUG_HWDEVICE
extern crypto::secret_key viewkey;
extern crypto::secret_key spendkey;
extern crypto::secret_key dbg_viewkey;
extern crypto::secret_key dbg_spendkey;
#endif
#endif //WITH_DEVICE_LEDGER

10
src/device/log.cpp
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@ -56,8 +56,8 @@ namespace hw {
}
#ifdef DEBUG_HWDEVICE
extern crypto::secret_key viewkey;
extern crypto::secret_key spendkey;
extern crypto::secret_key dbg_viewkey;
extern crypto::secret_key dbg_spendkey;
void decrypt(char* buf, size_t len) {
@ -69,7 +69,7 @@ namespace hw {
if (buf[i] != 0) break;
}
if (i == 32) {
memmove(buf, hw::ledger::viewkey.data, 32);
memmove(buf, hw::ledger::dbg_viewkey.data, 32);
return;
}
//spend key?
@ -77,7 +77,7 @@ namespace hw {
if (buf[i] != (char)0xff) break;
}
if (i == 32) {
memmove(buf, hw::ledger::spendkey.data, 32);
memmove(buf, hw::ledger::dbg_spendkey.data, 32);
return;
}
}
@ -161,4 +161,4 @@ namespace hw {
}
#endif //WITH_DEVICE_LEDGER
}
}

55
src/wallet/wallet2.cpp
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@ -1007,13 +1007,16 @@ void wallet2::set_unspent(size_t idx)
//----------------------------------------------------------------------------------------------------
void wallet2::check_acc_out_precomp(const tx_out &o, const crypto::key_derivation &derivation, const std::vector<crypto::key_derivation> &additional_derivations, size_t i, tx_scan_info_t &tx_scan_info) const
{
hw::device &hwdev = m_account.get_device();
std::unique_lock<hw::device> hwdev_lock (hwdev);
hwdev.set_mode(hw::device::TRANSACTION_PARSE);
if (o.target.type() != typeid(txout_to_key))
{
tx_scan_info.error = true;
LOG_ERROR("wrong type id in transaction out");
return;
}
tx_scan_info.received = is_out_to_acc_precomp(m_subaddresses, boost::get<txout_to_key>(o.target).key, derivation, additional_derivations, i, m_account.get_device());
tx_scan_info.received = is_out_to_acc_precomp(m_subaddresses, boost::get<txout_to_key>(o.target).key, derivation, additional_derivations, i, hwdev);
if(tx_scan_info.received)
{
tx_scan_info.money_transfered = o.amount; // may be 0 for ringct outputs
@ -1080,9 +1083,15 @@ void wallet2::scan_output(const cryptonote::transaction &tx, const crypto::publi
//----------------------------------------------------------------------------------------------------
void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote::transaction& tx, const std::vector<uint64_t> &o_indices, uint64_t height, uint64_t ts, bool miner_tx, bool pool, bool double_spend_seen)
{
// In this function, tx (probably) only contains the base information
// (that is, the prunable stuff may or may not be included)
//ensure device is let in NONE mode in any case
hw::device &hwdev = m_account.get_device();
std::unique_lock<hw::device> hwdev_lock (hwdev);
hw::reset_mode rst(hwdev);
hwdev_lock.unlock();
// In this function, tx (probably) only contains the base information
// (that is, the prunable stuff may or may not be included)
if (!miner_tx && !pool)
process_unconfirmed(txid, tx, height);
std::vector<size_t> outs;
@ -1119,8 +1128,10 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
tools::threadpool& tpool = tools::threadpool::getInstance();
tools::threadpool::waiter waiter;
const cryptonote::account_keys& keys = m_account.get_keys();
hw::device &hwdev = m_account.get_device();
crypto::key_derivation derivation;
hwdev_lock.lock();
hwdev.set_mode(hw::device::TRANSACTION_PARSE);
if (!hwdev.generate_key_derivation(tx_pub_key, keys.m_view_secret_key, derivation))
{
MWARNING("Failed to generate key derivation from tx pubkey, skipping");
@ -1140,6 +1151,7 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
additional_derivations.pop_back();
}
}
hwdev_lock.unlock();
if (miner_tx && m_refresh_type == RefreshNoCoinbase)
{
@ -1161,16 +1173,19 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
std::ref(tx_scan_info[i])));
}
waiter.wait();
// then scan all outputs from 0
hwdev_lock.lock();
hwdev.set_mode(hw::device::NONE);
for (size_t i = 0; i < tx.vout.size(); ++i)
{
THROW_WALLET_EXCEPTION_IF(tx_scan_info[i].error, error::acc_outs_lookup_error, tx, tx_pub_key, m_account.get_keys());
if (tx_scan_info[i].received)
{
hwdev.generate_key_derivation(tx_pub_key, keys.m_view_secret_key, tx_scan_info[i].received->derivation);
scan_output(tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs);
}
}
hwdev_lock.unlock();
}
}
else if (tx.vout.size() > 1 && tools::threadpool::getInstance().get_max_concurrency() > 1)
@ -1181,14 +1196,19 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
std::ref(tx_scan_info[i])));
}
waiter.wait();
hwdev_lock.lock();
hwdev.set_mode(hw::device::NONE);
for (size_t i = 0; i < tx.vout.size(); ++i)
{
THROW_WALLET_EXCEPTION_IF(tx_scan_info[i].error, error::acc_outs_lookup_error, tx, tx_pub_key, m_account.get_keys());
if (tx_scan_info[i].received)
{
hwdev.generate_key_derivation(tx_pub_key, keys.m_view_secret_key, tx_scan_info[i].received->derivation);
scan_output(tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs);
}
}
hwdev_lock.unlock();
}
else
{
@ -1198,7 +1218,11 @@ void wallet2::process_new_transaction(const crypto::hash &txid, const cryptonote
THROW_WALLET_EXCEPTION_IF(tx_scan_info[i].error, error::acc_outs_lookup_error, tx, tx_pub_key, m_account.get_keys());
if (tx_scan_info[i].received)
{
hwdev_lock.lock();
hwdev.set_mode(hw::device::NONE);
hwdev.generate_key_derivation(tx_pub_key, keys.m_view_secret_key, tx_scan_info[i].received->derivation);
scan_output(tx, tx_pub_key, i, tx_scan_info[i], num_vouts_received, tx_money_got_in_outs, outs);
hwdev_lock.unlock();
}
}
}
@ -7259,6 +7283,11 @@ bool wallet2::light_wallet_key_image_is_ours(const crypto::key_image& key_image,
// usable balance.
std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryptonote::tx_destination_entry> dsts, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t>& extra, uint32_t subaddr_account, std::set<uint32_t> subaddr_indices, bool trusted_daemon)
{
//ensure device is let in NONE mode in any case
hw::device &hwdev = m_account.get_device();
std::unique_lock<hw::device> hwdev_lock (hwdev);
hw::reset_mode rst(hwdev);
if(m_light_wallet) {
// Populate m_transfers
light_wallet_get_unspent_outs();
@ -7476,8 +7505,8 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
unsigned int original_output_index = 0;
std::vector<size_t>* unused_transfers_indices = &unused_transfers_indices_per_subaddr[0].second;
std::vector<size_t>* unused_dust_indices = &unused_dust_indices_per_subaddr[0].second;
hw::device &hwdev = m_account.get_device();
hwdev.set_signature_mode(hw::device::SIGNATURE_FAKE);
hwdev.set_mode(hw::device::TRANSACTION_CREATE_FAKE);
while ((!dsts.empty() && dsts[0].amount > 0) || adding_fee || !preferred_inputs.empty() || should_pick_a_second_output(use_rct, txes.back().selected_transfers.size(), *unused_transfers_indices, *unused_dust_indices)) {
TX &tx = txes.back();
@ -7706,7 +7735,7 @@ skip_tx:
LOG_PRINT_L1("Done creating " << txes.size() << " transactions, " << print_money(accumulated_fee) <<
" total fee, " << print_money(accumulated_change) << " total change");
hwdev.set_signature_mode(hw::device::SIGNATURE_REAL);
hwdev.set_mode(hw::device::TRANSACTION_CREATE_REAL);
for (std::vector<TX>::iterator i = txes.begin(); i != txes.end(); ++i)
{
TX &tx = *i;
@ -7837,6 +7866,11 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_single(const crypt
std::vector<wallet2::pending_tx> wallet2::create_transactions_from(const cryptonote::account_public_address &address, bool is_subaddress, std::vector<size_t> unused_transfers_indices, std::vector<size_t> unused_dust_indices, const size_t fake_outs_count, const uint64_t unlock_time, uint32_t priority, const std::vector<uint8_t>& extra, bool trusted_daemon)
{
//ensure device is let in NONE mode in any case
hw::device &hwdev = m_account.get_device();
std::unique_lock<hw::device> hwdev_lock (hwdev);
hw::reset_mode rst(hwdev);
uint64_t accumulated_fee, accumulated_outputs, accumulated_change;
struct TX {
std::vector<size_t> selected_transfers;
@ -7869,8 +7903,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_from(const crypton
needed_fee = 0;
// while we have something to send
hw::device &hwdev = m_account.get_device();
hwdev.set_signature_mode(hw::device::SIGNATURE_FAKE);
hwdev.set_mode(hw::device::TRANSACTION_CREATE_FAKE);
while (!unused_dust_indices.empty() || !unused_transfers_indices.empty()) {
TX &tx = txes.back();
@ -7956,7 +7989,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_from(const crypton
LOG_PRINT_L1("Done creating " << txes.size() << " transactions, " << print_money(accumulated_fee) <<
" total fee, " << print_money(accumulated_change) << " total change");
hwdev.set_signature_mode(hw::device::SIGNATURE_REAL);
hwdev.set_mode(hw::device::TRANSACTION_CREATE_REAL);
for (std::vector<TX>::iterator i = txes.begin(); i != txes.end(); ++i)
{
TX &tx = *i;

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