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Add hmac over encrypted value during transaction

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This commit is contained in:
cslashm 2019-09-25 14:31:14 +02:00
parent b8643752c1
commit d25acd7a1d
3 changed files with 190 additions and 106 deletions
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6
src/cryptonote_core/cryptonote_tx_utils.cpp
View File

@ -612,7 +612,7 @@ namespace cryptonote
{
hw::device &hwdev = sender_account_keys.get_device();
hwdev.open_tx(tx_key);
try {
// figure out if we need to make additional tx pubkeys
size_t num_stdaddresses = 0;
size_t num_subaddresses = 0;
@ -629,6 +629,10 @@ namespace cryptonote
bool r = construct_tx_with_tx_key(sender_account_keys, subaddresses, sources, destinations, change_addr, extra, tx, unlock_time, tx_key, additional_tx_keys, rct, rct_config, msout);
hwdev.close_tx();
return r;
} catch(...) {
hwdev.close_tx();
throw;
}
}
//---------------------------------------------------------------
bool construct_tx(const account_keys& sender_account_keys, std::vector<tx_source_entry>& sources, const std::vector<tx_destination_entry>& destinations, const boost::optional<cryptonote::account_public_address>& change_addr, const std::vector<uint8_t> &extra, transaction& tx, uint64_t unlock_time)

209
src/device/device_ledger.cpp
View File

@ -64,6 +64,41 @@ namespace hw {
crypto::secret_key dbg_spendkey;
#endif
/* ===================================================================== */
/* === hmacmap ==== */
/* ===================================================================== */
SecHMAC::SecHMAC(const uint8_t s[32], const uint8_t h[32]) {
memcpy(this->sec, s, 32);
memcpy(this->hmac, h, 32);
}
void HMACmap::find_mac(const uint8_t sec[32], uint8_t hmac[32]) {
size_t sz = hmacs.size();
log_hexbuffer("find_mac: lookup for ", (char*)sec,32);
for (size_t i=0; i<sz; i++) {
log_hexbuffer("find_mac: - try ",(char*)hmacs[i].sec,32);
if (memcmp(sec, hmacs[i].sec, 32) == 0) {
memcpy(hmac, hmacs[i].hmac, 32);
log_hexbuffer("find_mac: - found ",(char*)hmacs[i].hmac,32);
return;
}
}
throw std::runtime_error("Protocol error: try to send untrusted secret");
}
void HMACmap::add_mac(const uint8_t sec[32], const uint8_t hmac[32]) {
log_hexbuffer("add_mac: sec ", (char*)sec,32);
log_hexbuffer("add_mac: hmac ", (char*)hmac,32);
hmacs.push_back(SecHMAC(sec,hmac));
}
void HMACmap::clear() {
hmacs.clear();
}
/* ===================================================================== */
/* === Keymap ==== */
/* ===================================================================== */
@ -205,6 +240,7 @@ namespace hw {
this->reset_buffer();
this->mode = NONE;
this->has_view_key = false;
this->tx_in_progress = false;
MDEBUG( "Device "<<this->id <<" Created");
}
@ -317,6 +353,26 @@ namespace hw {
}
}
void device_ledger::send_secret(const unsigned char sec[32], int &offset) {
MDEBUG("send_secret: " << this->tx_in_progress);
memmove(this->buffer_send+offset, sec, 32);
offset +=32;
if (this->tx_in_progress) {
this->hmac_map.find_mac((uint8_t*)sec, this->buffer_send+offset);
offset += 32;
}
}
void device_ledger::receive_secret(unsigned char sec[32], int &offset) {
MDEBUG("receive_secret: " << this->tx_in_progress);
memmove(sec, this->buffer_recv+offset, 32);
offset += 32;
if (this->tx_in_progress) {
this->hmac_map.add_mac((uint8_t*)sec, this->buffer_recv+offset);
offset += 32;
}
}
bool device_ledger::reset() {
reset_buffer();
int offset = set_command_header_noopt(INS_RESET);
@ -573,8 +629,7 @@ namespace hw {
memmove(this->buffer_send+offset, pub.data, 32);
offset += 32;
//derivation
memmove(this->buffer_send+offset, derivation.data, 32);
offset += 32;
this->send_secret((unsigned char*)derivation.data, offset);
//index
this->buffer_send[offset+0] = output_index>>24;
this->buffer_send[offset+1] = output_index>>16;
@ -706,8 +761,7 @@ namespace hw {
int offset = set_command_header_noopt(INS_GET_SUBADDRESS_SECRET_KEY);
//sec
memmove(this->buffer_send+offset, sec.data, 32);
offset += 32;
this->send_secret((unsigned char*)sec.data, offset);
//index
static_assert(sizeof(cryptonote::subaddress_index) == 8, "cryptonote::subaddress_index shall be 8 bytes length");
memmove(this->buffer_send+offset, &index, sizeof(cryptonote::subaddress_index));
@ -717,7 +771,8 @@ namespace hw {
this->length_send = offset;
this->exchange();
memmove(sub_sec.data, &this->buffer_recv[0], 32);
offset = 0;
this->receive_secret((unsigned char*)sub_sec.data, offset);
#ifdef DEBUG_HWDEVICE
crypto::secret_key sub_sec_clear = hw::ledger::decrypt(sub_sec);
@ -737,8 +792,7 @@ namespace hw {
offset = set_command_header_noopt(INS_VERIFY_KEY);
//sec
memmove(this->buffer_send+offset, secret_key.data, 32);
offset += 32;
this->send_secret((unsigned char*)secret_key.data, offset);
//pub
memmove(this->buffer_send+offset, public_key.data, 32);
offset += 32;
@ -774,9 +828,7 @@ namespace hw {
memmove(this->buffer_send+offset, P.bytes, 32);
offset += 32;
//sec
memmove(this->buffer_send+offset, a.bytes, 32);
offset += 32;
this->send_secret(a.bytes, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -805,8 +857,7 @@ namespace hw {
int offset = set_command_header_noopt(INS_SECRET_SCAL_MUL_BASE);
//sec
memmove(this->buffer_send+offset, a.bytes, 32);
offset += 32;
this->send_secret(a.bytes, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -824,6 +875,7 @@ namespace hw {
bool device_ledger::sc_secret_add( crypto::secret_key &r, const crypto::secret_key &a, const crypto::secret_key &b) {
AUTO_LOCK_CMD();
int offset;
#ifdef DEBUG_HWDEVICE
const crypto::secret_key a_x = hw::ledger::decrypt(a);
@ -836,20 +888,19 @@ namespace hw {
log_hexbuffer("sc_secret_add: [[OUT]] aG", (char*)r_x.data, 32);
#endif
int offset = set_command_header_noopt(INS_SECRET_KEY_ADD);
offset = set_command_header_noopt(INS_SECRET_KEY_ADD);
//sec key
memmove(this->buffer_send+offset, a.data, 32);
offset += 32;
this->send_secret((unsigned char*)a.data, offset);
//sec key
memmove(this->buffer_send+offset, b.data, 32);
offset += 32;
this->send_secret((unsigned char*)b.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
//pub key
memmove(r.data, &this->buffer_recv[0], 32);
//sec key
offset = 0;
this->receive_secret((unsigned char*)r.data, offset);
#ifdef DEBUG_HWDEVICE
crypto::secret_key r_clear = hw::ledger::decrypt(r);
@ -861,6 +912,8 @@ namespace hw {
crypto::secret_key device_ledger::generate_keys(crypto::public_key &pub, crypto::secret_key &sec, const crypto::secret_key& recovery_key, bool recover) {
AUTO_LOCK_CMD();
int offset;
if (recover) {
throw std::runtime_error("device generate key does not support recover");
}
@ -877,9 +930,11 @@ namespace hw {
send_simple(INS_GENERATE_KEYPAIR);
offset = 0;
//pub key
memmove(pub.data, &this->buffer_recv[0], 32);
memmove(sec.data, &this->buffer_recv[32], 32);
offset += 32;
this->receive_secret((unsigned char*)sec.data, offset);
#ifdef DEBUG_HWDEVICE
crypto::secret_key sec_clear = hw::ledger::decrypt(sec);
@ -922,15 +977,16 @@ namespace hw {
memmove(this->buffer_send+offset, pub.data, 32);
offset += 32;
//sec
memmove(this->buffer_send+offset, sec.data, 32);
offset += 32;
this->send_secret((unsigned char*)sec.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
offset = 0;
//derivattion data
memmove(derivation.data, &this->buffer_recv[0], 32);
this->receive_secret((unsigned char*)derivation.data, offset);
r = true;
}
#ifdef DEBUG_HWDEVICE
@ -978,9 +1034,9 @@ namespace hw {
#endif
int offset = set_command_header_noopt(INS_DERIVATION_TO_SCALAR);
//derivattion
memmove(this->buffer_send+offset, derivation.data, 32);
offset += 32;
//derivation
this->send_secret((unsigned char*)derivation.data, offset);
//index
this->buffer_send[offset+0] = output_index>>24;
this->buffer_send[offset+1] = output_index>>16;
@ -992,8 +1048,9 @@ namespace hw {
this->length_send = offset;
this->exchange();
//derivattion data
memmove(res.data, &this->buffer_recv[0], 32);
//derivation data
offset = 0;
this->receive_secret((unsigned char*)res.data, offset);
#ifdef DEBUG_HWDEVICE
crypto::ec_scalar res_clear = hw::ledger::decrypt(res);
@ -1020,8 +1077,7 @@ namespace hw {
int offset = set_command_header_noopt(INS_DERIVE_SECRET_KEY);
//derivation
memmove(this->buffer_send+offset, derivation.data, 32);
offset += 32;
this->send_secret((unsigned char*)derivation.data, offset);
//index
this->buffer_send[offset+0] = output_index>>24;
this->buffer_send[offset+1] = output_index>>16;
@ -1029,15 +1085,15 @@ namespace hw {
this->buffer_send[offset+3] = output_index>>0;
offset += 4;
//sec
memmove(this->buffer_send+offset, sec.data, 32);
offset += 32;
this->send_secret((unsigned char*)sec.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
//pub key
memmove(derived_sec.data, &this->buffer_recv[0], 32);
offset = 0;
//sec key
this->receive_secret((unsigned char*)derived_sec.data, offset);
#ifdef DEBUG_HWDEVICE
crypto::secret_key derived_sec_clear = hw::ledger::decrypt(derived_sec);
@ -1064,8 +1120,7 @@ namespace hw {
int offset = set_command_header_noopt(INS_DERIVE_PUBLIC_KEY);
//derivation
memmove(this->buffer_send+offset, derivation.data, 32);
offset += 32;
this->send_secret((unsigned char*)derivation.data, offset);
//index
this->buffer_send[offset+0] = output_index>>24;
this->buffer_send[offset+1] = output_index>>16;
@ -1106,8 +1161,7 @@ namespace hw {
int offset = set_command_header_noopt(INS_SECRET_KEY_TO_PUBLIC_KEY);
//sec key
memmove(this->buffer_send+offset, sec.data, 32);
offset += 32;
this->send_secret((unsigned char*)sec.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1141,8 +1195,7 @@ namespace hw {
memmove(this->buffer_send+offset, pub.data, 32);
offset += 32;
//sec
memmove(this->buffer_send+offset, sec.data, 32);
offset += 32;
this->send_secret((unsigned char*)sec.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1211,8 +1264,7 @@ namespace hw {
memmove(&this->buffer_send[offset], D.data, 32);
offset += 32;
// r
memmove(&this->buffer_send[offset], r.data, 32);
offset += 32;
this->send_secret((unsigned char*)r.data, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1233,8 +1285,10 @@ namespace hw {
bool device_ledger::open_tx(crypto::secret_key &tx_key) {
AUTO_LOCK_CMD();
this->lock();
key_map.clear();
hmac_map.clear();
this->tx_in_progress = true;
int offset = set_command_header_noopt(INS_OPEN_TX, 0x01);
//account
@ -1248,7 +1302,13 @@ namespace hw {
this->length_send = offset;
this->exchange();
memmove(tx_key.data, &this->buffer_recv[32], 32);
//skip R, receive: r, r_hmac, fake_a, a_hmac, fake_b, hmac_b
unsigned char tmp[32];
offset = 32;
this->receive_secret((unsigned char*)tx_key.data, offset);
this->receive_secret(tmp, offset);
this->receive_secret(tmp, offset);
#ifdef DEBUG_HWDEVICE
const crypto::secret_key r_x = hw::ledger::decrypt(tx_key);
log_hexbuffer("open_tx: [[OUT]] R ", (char*)&this->buffer_recv[0], 32);
@ -1276,8 +1336,7 @@ namespace hw {
memmove(&this->buffer_send[offset], public_key.data, 32);
offset += 32;
//sec
memmove(&this->buffer_send[offset], secret_key.data, 32);
offset += 32;
this->send_secret((unsigned char*)secret_key.data, offset);
//id
memmove(&this->buffer_send[offset], payment_id.data, 8);
offset += 8;
@ -1365,8 +1424,7 @@ namespace hw {
this->buffer_send[offset+3] = tx_version>>0;
offset += 4;
//tx_key
memmove(&this->buffer_send[offset], tx_key.data, 32);
offset += 32;
this->send_secret((unsigned char*)tx_key.data, offset);
//txkey_pub
memmove(&this->buffer_send[offset], txkey_pub.data, 32);
offset += 32;
@ -1394,11 +1452,11 @@ namespace hw {
offset++;
//additional_tx_key
if (need_additional_txkeys) {
memmove(&this->buffer_send[offset], additional_txkey.sec.data, 32);
this->send_secret((unsigned char*)additional_txkey.sec.data, offset);
} else {
memset(&this->buffer_send[offset], 0, 32);
}
offset += 32;
}
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1411,9 +1469,8 @@ namespace hw {
{
ASSERT_X(recv_len>=32, "Not enought data from device");
crypto::secret_key scalar1;
memmove(scalar1.data, &this->buffer_recv[offset],32);
this->receive_secret((unsigned char*)scalar1.data, offset);
amount_keys.push_back(rct::sk2rct(scalar1));
offset += 32;
recv_len -= 32;
}
ASSERT_X(recv_len>=32, "Not enought data from device");
@ -1464,8 +1521,7 @@ namespace hw {
rct::key mask;
int offset = set_command_header_noopt(INS_GEN_COMMITMENT_MASK);
// AKout
memmove(this->buffer_send+offset, AKout.bytes, 32);
offset += 32;
this->send_secret(AKout.bytes, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1494,8 +1550,7 @@ namespace hw {
this->buffer_send[offset] = short_amount?0x02:0x00;
offset += 1;
// AKout
memmove(this->buffer_send+offset, AKout.bytes, 32);
offset += 32;
this->send_secret(AKout.bytes, offset);
//mask k
memmove(this->buffer_send+offset, unmasked.mask.bytes, 32);
offset += 32;
@ -1535,8 +1590,7 @@ namespace hw {
this->buffer_send[offset] = short_amount?0x02:0x00;
offset += 1;
// AKout
memmove(this->buffer_send+offset, AKout.bytes, 32);
offset += 32;
this->send_secret(AKout.bytes, offset);
//mask k
memmove(this->buffer_send+offset, masked.mask.bytes, 32);
offset += 32;
@ -1649,7 +1703,6 @@ namespace hw {
this->buffer_send[offset] = (i==outputs_size-1)? 0x00:0x80 ;
this->buffer_send[offset] |= (type==rct::RCTTypeBulletproof2)?0x02:0x00;
offset += 1;
if (found) {
//is_subaddress
this->buffer_send[offset] = outKeys.is_subaddress;
offset++;
@ -1663,12 +1716,8 @@ namespace hw {
memmove(this->buffer_send+offset, outKeys.Bout.bytes, 32);
offset+=32;
//AKout
memmove(this->buffer_send+offset, outKeys.AKout.bytes, 32);
offset+=32;
} else {
// dummy: is_subaddress Aout Bout AKout
offset += 2+32*3;
}
this->send_secret(outKeys.AKout.bytes, offset);
//C
memmove(this->buffer_send+offset, data+C_offset,32);
offset += 32;
@ -1760,17 +1809,19 @@ namespace hw {
memmove(this->buffer_send+offset, H.bytes, 32);
offset += 32;
//mask xin
memmove(this->buffer_send+offset, xx.bytes, 32);
offset += 32;
this->send_secret(xx.bytes, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
this->exchange();
memmove(a.bytes, &this->buffer_recv[32*0], 32);
memmove(aG.bytes, &this->buffer_recv[32*1], 32);
memmove(aHP.bytes, &this->buffer_recv[32*2], 32);
memmove(II.bytes, &this->buffer_recv[32*3], 32);
offset = 0;
this->receive_secret(a.bytes, offset);
memmove(aG.bytes, &this->buffer_recv[offset], 32);
offset +=32;
memmove(aHP.bytes, &this->buffer_recv[offset], 32);
offset +=32;
memmove(II.bytes, &this->buffer_recv[offset], 32);
#ifdef DEBUG_HWDEVICE
a_x = hw::ledger::decrypt(a);
@ -1788,6 +1839,7 @@ namespace hw {
bool device_ledger::mlsag_prepare(rct::key &a, rct::key &aG) {
AUTO_LOCK_CMD();
int offset;
#ifdef DEBUG_HWDEVICE
rct::key a_x;
@ -1796,8 +1848,9 @@ namespace hw {
send_simple(INS_MLSAG, 0x01);
memmove(a.bytes, &this->buffer_recv[32*0], 32);
memmove(aG.bytes, &this->buffer_recv[32*1], 32);
offset = 0;
this->receive_secret(a.bytes, offset);
memmove(aG.bytes, &this->buffer_recv[offset], 32);
#ifdef DEBUG_HWDEVICE
a_x = hw::ledger::decrypt(a);
@ -1870,11 +1923,9 @@ namespace hw {
}
offset += 1;
//xx
memmove(this->buffer_send+offset, xx[j].bytes, 32);
offset += 32;
this->send_secret(xx[j].bytes, offset);
//alpa
memmove(this->buffer_send+offset, alpha[j].bytes, 32);
offset += 32;
this->send_secret(alpha[j].bytes, offset);
this->buffer_send[4] = offset-5;
this->length_send = offset;
@ -1900,6 +1951,10 @@ namespace hw {
bool device_ledger::close_tx() {
AUTO_LOCK_CMD();
send_simple(INS_CLOSE_TX);
key_map.clear();
hmac_map.clear();
this->tx_in_progress = false;
this->unlock();
return true;
}

27
src/device/device_ledger.hpp
View File

@ -90,6 +90,25 @@ namespace hw {
void log();
};
class SecHMAC {
public:
uint32_t sec[32];
uint32_t hmac[32];
SecHMAC(const uint8_t s[32], const uint8_t m[32]);
};
class HMACmap {
public:
std::vector<SecHMAC> hmacs;
void find_mac(const uint8_t sec[32], uint8_t hmac[32]) ;
void add_mac(const uint8_t sec[32], const uint8_t hmac[32]) ;
void clear() ;
};
#define BUFFER_SEND_SIZE 262
#define BUFFER_RECV_SIZE 262
@ -115,15 +134,21 @@ namespace hw {
int set_command_header(unsigned char ins, unsigned char p1 = 0x00, unsigned char p2 = 0x00);
int set_command_header_noopt(unsigned char ins, unsigned char p1 = 0x00, unsigned char p2 = 0x00);
void send_simple(unsigned char ins, unsigned char p1 = 0x00);
void send_secret(const unsigned char sec[32], int &offset);
void receive_secret(unsigned char sec[32], int &offset);
// hw running mode
device_mode mode;
bool tx_in_progress;
// map public destination key to ephemeral destination key
Keymap key_map;
bool add_output_key_mapping(const crypto::public_key &Aout, const crypto::public_key &Bout, const bool is_subaddress, const bool is_change,
const bool need_additional, const size_t real_output_index,
const rct::key &amount_key, const crypto::public_key &out_eph_public_key);
//hmac for some encrypted value
HMACmap hmac_map;
// To speed up blockchain parsing the view key maybe handle here.
crypto::secret_key viewkey;
bool has_view_key;