Host-customized fork of https://github.com/tecnovert/basicswap/
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2020-2023 tecnovert
# Distributed under the MIT software license, see the accompanying
# file LICENSE or http://www.opensource.org/licenses/mit-license.php.
import hashlib
from enum import IntEnum
from basicswap.contrib.test_framework.messages import (
CTxOutPart,
)
from basicswap.contrib.test_framework.script import (
CScript,
OP_0,
OP_DUP, OP_HASH160, OP_EQUALVERIFY, OP_CHECKSIG
)
from basicswap.util import (
i2b,
ensure,
make_int,
TemporaryError,
)
from basicswap.util.script import (
getP2WSH,
getCompactSizeLen,
getWitnessElementLen,
)
from basicswap.util.address import (
toWIF,
encodeStealthAddress)
from basicswap.chainparams import Coins, chainparams
from .btc import BTCInterface
class BalanceTypes(IntEnum):
PLAIN = 1
BLIND = 2
ANON = 3
class PARTInterface(BTCInterface):
@staticmethod
def coin_type():
return Coins.PART
@staticmethod
def balance_type():
return BalanceTypes.PLAIN
@staticmethod
def witnessScaleFactor() -> int:
return 2
@staticmethod
def txVersion() -> int:
return 0xa0
@staticmethod
def xmr_swap_alock_spend_tx_vsize() -> int:
return 213
@staticmethod
def txoType():
return CTxOutPart
def __init__(self, coin_settings, network, swap_client=None):
super().__init__(coin_settings, network, swap_client)
self.setAnonTxRingSize(int(coin_settings.get('anon_tx_ring_size', 12)))
def setAnonTxRingSize(self, value):
ensure(value >= 3 and value < 33, 'Invalid anon_tx_ring_size value')
self._anon_tx_ring_size = value
def knownWalletSeed(self):
# TODO: Double check
return True
def getNewAddress(self, use_segwit, label='swap_receive') -> str:
return self.rpc_callback('getnewaddress', [label])
def getNewStealthAddress(self, label='swap_stealth') -> str:
return self.rpc_callback('getnewstealthaddress', [label])
def haveSpentIndex(self):
version = self.getDaemonVersion()
index_info = self.rpc_callback('getinsightinfo' if int(str(version)[:2]) > 19 else 'getindexinfo')
return index_info['spentindex']
def initialiseWallet(self, key):
raise ValueError('TODO')
def withdrawCoin(self, value, addr_to, subfee):
params = [addr_to, value, '', '', subfee, '', True, self._conf_target]
return self.rpc_callback('sendtoaddress', params)
def sendTypeTo(self, type_from, type_to, value, addr_to, subfee):
params = [type_from, type_to,
[{'address': addr_to, 'amount': value, 'subfee': subfee}, ],
'', '', self._anon_tx_ring_size, 1, False,
{'conf_target': self._conf_target}]
return self.rpc_callback('sendtypeto', params)
def getScriptForPubkeyHash(self, pkh):
return CScript([OP_DUP, OP_HASH160, pkh, OP_EQUALVERIFY, OP_CHECKSIG])
def formatStealthAddress(self, scan_pubkey, spend_pubkey) -> str:
prefix_byte = chainparams[self.coin_type()][self._network]['stealth_key_prefix']
return encodeStealthAddress(prefix_byte, scan_pubkey, spend_pubkey)
def getWitnessStackSerialisedLength(self, witness_stack):
length = getCompactSizeLen(len(witness_stack))
for e in witness_stack:
length += getWitnessElementLen(len(e) // 2) # hex -> bytes
return length
def getWalletRestoreHeight(self) -> int:
start_time = self.rpc_callback('getwalletinfo')['keypoololdest']
blockchaininfo = self.rpc_callback('getblockchaininfo')
best_block = blockchaininfo['bestblockhash']
chain_synced = round(blockchaininfo['verificationprogress'], 3)
if chain_synced < 1.0:
raise ValueError('{} chain isn\'t synced.'.format(self.coin_name()))
self._log.debug('Finding block at time: {}'.format(start_time))
block_hash = self.rpc_callback('getblockhashafter', [start_time])
block_header = self.rpc_callback('getblockheader', [block_hash])
return block_header['height']
def isValidAddress(self, address: str) -> bool:
try:
rv = self.rpc_callback('validateaddress', [address])
if rv['isvalid'] is True:
return True
except Exception as ex:
self._log.debug('validateaddress failed: {}'.format(address))
return False
class PARTInterfaceBlind(PARTInterface):
@staticmethod
def balance_type():
return BalanceTypes.BLIND
def coin_name(self):
return super().coin_name() + ' Blind'
def getScriptLockTxNonce(self, data):
return hashlib.sha256(data + bytes('locktx', 'utf-8')).digest()
def getScriptLockRefundTxNonce(self, data):
return hashlib.sha256(data + bytes('lockrefundtx', 'utf-8')).digest()
def findOutputByNonce(self, tx_obj, nonce):
blinded_info = None
output_n = None
for txo in tx_obj['vout']:
if txo['type'] != 'blind':
continue
try:
blinded_info = self.rpc_callback('rewindrangeproof', [txo['rangeproof'], txo['valueCommitment'], nonce.hex()])
output_n = txo['n']
self.rpc_callback('rewindrangeproof', [txo['rangeproof'], txo['valueCommitment'], nonce.hex()])
break
except Exception as e:
self._log.debug('Searching for locked output: {}'.format(str(e)))
continue
# Should not be possible for commitment not to match
v = self.rpc_callback('verifycommitment', [txo['valueCommitment'], blinded_info['blind'], blinded_info['amount']])
ensure(v['result'] is True, 'verifycommitment failed')
return output_n, blinded_info
def createSCLockTx(self, value: int, script: bytearray, vkbv) -> bytes:
# Nonce is derived from vkbv, ephemeral_key isn't used
ephemeral_key = i2b(self.getNewSecretKey())
ephemeral_pubkey = self.getPubkey(ephemeral_key)
assert (len(ephemeral_pubkey) == 33)
nonce = self.getScriptLockTxNonce(vkbv)
p2wsh_addr = self.encode_p2wsh(getP2WSH(script))
inputs = []
outputs = [{'type': 'blind', 'amount': self.format_amount(value), 'address': p2wsh_addr, 'nonce': nonce.hex(), 'data': ephemeral_pubkey.hex()}]
params = [inputs, outputs]
rv = self.rpc_callback('createrawparttransaction', params)
tx_bytes = bytes.fromhex(rv['hex'])
return tx_bytes
def fundSCLockTx(self, tx_bytes, feerate, vkbv):
feerate_str = self.format_amount(feerate)
# TODO: unlock unspents if bid cancelled
tx_hex = tx_bytes.hex()
nonce = self.getScriptLockTxNonce(vkbv)
tx_obj = self.rpc_callback('decoderawtransaction', [tx_hex])
assert (len(tx_obj['vout']) == 1)
txo = tx_obj['vout'][0]
blinded_info = self.rpc_callback('rewindrangeproof', [txo['rangeproof'], txo['valueCommitment'], nonce.hex()])
outputs_info = {0: {'value': blinded_info['amount'], 'blind': blinded_info['blind'], 'nonce': nonce.hex()}}
options = {
'lockUnspents': True,
'feeRate': feerate_str,
}
rv = self.rpc_callback('fundrawtransactionfrom', ['blind', tx_hex, {}, outputs_info, options])
return bytes.fromhex(rv['hex'])
def createSCLockRefundTx(self, tx_lock_bytes, script_lock, Kal, Kaf, lock1_value, csv_val, tx_fee_rate, vkbv):
lock_tx_obj = self.rpc_callback('decoderawtransaction', [tx_lock_bytes.hex()])
assert (self.getTxid(tx_lock_bytes).hex() == lock_tx_obj['txid'])
# Nonce is derived from vkbv, ephemeral_key isn't used
ephemeral_key = i2b(self.getNewSecretKey())
ephemeral_pubkey = self.getPubkey(ephemeral_key)
assert (len(ephemeral_pubkey) == 33)
nonce = self.getScriptLockTxNonce(vkbv)
output_nonce = self.getScriptLockRefundTxNonce(vkbv)
# Find the output of the lock tx to spend
spend_n, input_blinded_info = self.findOutputByNonce(lock_tx_obj, nonce)
ensure(spend_n is not None, 'Output not found in tx')
locked_coin = input_blinded_info['amount']
tx_lock_id = lock_tx_obj['txid']
refund_script = self.genScriptLockRefundTxScript(Kal, Kaf, csv_val)
p2wsh_addr = self.encode_p2wsh(getP2WSH(refund_script))
inputs = [{'txid': tx_lock_id, 'vout': spend_n, 'sequence': lock1_value, 'blindingfactor': input_blinded_info['blind']}]
outputs = [{'type': 'blind', 'amount': locked_coin, 'address': p2wsh_addr, 'nonce': output_nonce.hex(), 'data': ephemeral_pubkey.hex()}]
params = [inputs, outputs]
rv = self.rpc_callback('createrawparttransaction', params)
lock_refund_tx_hex = rv['hex']
# Set dummy witness data for fee estimation
dummy_witness_stack = self.getScriptLockTxDummyWitness(script_lock)
# Use a junk change pubkey to avoid adding unused keys to the wallet
zero_change_key = i2b(self.getNewSecretKey())
zero_change_pubkey = self.getPubkey(zero_change_key)
inputs_info = {'0': {'value': input_blinded_info['amount'], 'blind': input_blinded_info['blind'], 'witnessstack': dummy_witness_stack}}
outputs_info = rv['amounts']
options = {
'changepubkey': zero_change_pubkey.hex(),
'feeRate': self.format_amount(tx_fee_rate),
'subtractFeeFromOutputs': [0, ]
}
rv = self.rpc_callback('fundrawtransactionfrom', ['blind', lock_refund_tx_hex, inputs_info, outputs_info, options])
lock_refund_tx_hex = rv['hex']
for vout, txo in rv['output_amounts'].items():
if txo['value'] > 0:
refunded_value = txo['value']
return bytes.fromhex(lock_refund_tx_hex), refund_script, refunded_value
def createSCLockRefundSpendTx(self, tx_lock_refund_bytes, script_lock_refund, pkh_refund_to, tx_fee_rate, vkbv):
# Returns the coinA locked coin to the leader
# The follower will sign the multisig path with a signature encumbered by the leader's coinB spend pubkey
# If the leader publishes the decrypted signature the leader's coinB spend privatekey will be revealed to the follower
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [tx_lock_refund_bytes.hex()])
# Nonce is derived from vkbv
nonce = self.getScriptLockRefundTxNonce(vkbv)
# Find the output of the lock refund tx to spend
spend_n, input_blinded_info = self.findOutputByNonce(lock_refund_tx_obj, nonce)
ensure(spend_n is not None, 'Output not found in tx')
tx_lock_refund_id = lock_refund_tx_obj['txid']
addr_out = self.pkh_to_address(pkh_refund_to)
addr_info = self.rpc_callback('getaddressinfo', [addr_out])
output_pubkey_hex = addr_info['pubkey']
# Follower won't be able to decode output to check amount, shouldn't matter as fee is public and output is to leader, sum has to balance
inputs = [{'txid': tx_lock_refund_id, 'vout': spend_n, 'sequence': 0, 'blindingfactor': input_blinded_info['blind']}]
outputs = [{'type': 'blind', 'amount': input_blinded_info['amount'], 'address': addr_out, 'pubkey': output_pubkey_hex}]
params = [inputs, outputs]
rv = self.rpc_callback('createrawparttransaction', params)
lock_refund_spend_tx_hex = rv['hex']
# Set dummy witness data for fee estimation
dummy_witness_stack = self.getScriptLockRefundSpendTxDummyWitness(script_lock_refund)
# Use a junk change pubkey to avoid adding unused keys to the wallet
zero_change_key = i2b(self.getNewSecretKey())
zero_change_pubkey = self.getPubkey(zero_change_key)
inputs_info = {'0': {'value': input_blinded_info['amount'], 'blind': input_blinded_info['blind'], 'witnessstack': dummy_witness_stack}}
outputs_info = rv['amounts']
options = {
'changepubkey': zero_change_pubkey.hex(),
'feeRate': self.format_amount(tx_fee_rate),
'subtractFeeFromOutputs': [0, ]
}
rv = self.rpc_callback('fundrawtransactionfrom', ['blind', lock_refund_spend_tx_hex, inputs_info, outputs_info, options])
lock_refund_spend_tx_hex = rv['hex']
return bytes.fromhex(lock_refund_spend_tx_hex)
def verifySCLockTx(self, tx_bytes, script_out,
swap_value,
Kal, Kaf,
feerate,
check_lock_tx_inputs, vkbv):
lock_tx_obj = self.rpc_callback('decoderawtransaction', [tx_bytes.hex()])
lock_txid_hex = lock_tx_obj['txid']
self._log.info('Verifying lock tx: {}.'.format(lock_txid_hex))
ensure(lock_tx_obj['version'] == self.txVersion(), 'Bad version')
ensure(lock_tx_obj['locktime'] == 0, 'Bad nLockTime')
# Find the output of the lock tx to verify
nonce = self.getScriptLockTxNonce(vkbv)
lock_output_n, blinded_info = self.findOutputByNonce(lock_tx_obj, nonce)
ensure(lock_output_n is not None, 'Output not found in tx')
# Check value
locked_txo_value = make_int(blinded_info['amount'])
ensure(locked_txo_value == swap_value, 'Bad locked value')
# Check script
lock_txo_scriptpk = bytes.fromhex(lock_tx_obj['vout'][lock_output_n]['scriptPubKey']['hex'])
script_pk = CScript([OP_0, hashlib.sha256(script_out).digest()])
ensure(lock_txo_scriptpk == script_pk, 'Bad output script')
A, B = self.extractScriptLockScriptValues(script_out)
ensure(A == Kal, 'Bad script leader pubkey')
ensure(B == Kaf, 'Bad script follower pubkey')
# TODO: Check that inputs are unspent, rangeproofs and commitments sum
# Verify fee rate
vsize = lock_tx_obj['vsize']
fee_paid = make_int(lock_tx_obj['vout'][0]['ct_fee'])
fee_rate_paid = fee_paid * 1000 // vsize
self._log.info('tx amount, vsize, feerate: %ld, %ld, %ld', locked_txo_value, vsize, fee_rate_paid)
if not self.compareFeeRates(fee_rate_paid, feerate):
self._log.warning('feerate paid doesn\'t match expected: %ld, %ld', fee_rate_paid, feerate)
# TODO: Display warning to user
return bytes.fromhex(lock_txid_hex), lock_output_n
def verifySCLockRefundTx(self, tx_bytes, lock_tx_bytes, script_out,
prevout_id, prevout_n, prevout_seq, prevout_script,
Kal, Kaf, csv_val_expect, swap_value, feerate, vkbv):
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [tx_bytes.hex()])
lock_refund_txid_hex = lock_refund_tx_obj['txid']
self._log.info('Verifying lock refund tx: {}.'.format(lock_refund_txid_hex))
ensure(lock_refund_tx_obj['version'] == self.txVersion(), 'Bad version')
ensure(lock_refund_tx_obj['locktime'] == 0, 'Bad nLockTime')
ensure(len(lock_refund_tx_obj['vin']) == 1, 'tx doesn\'t have one input')
txin = lock_refund_tx_obj['vin'][0]
ensure(txin['sequence'] == prevout_seq, 'Bad input nSequence')
ensure(txin['scriptSig']['hex'] == '', 'Input scriptsig not empty')
ensure(txin['txid'] == prevout_id.hex() and txin['vout'] == prevout_n, 'Input prevout mismatch')
ensure(len(lock_refund_tx_obj['vout']) == 3, 'tx doesn\'t have three outputs')
# Find the output of the lock refund tx to verify
nonce = self.getScriptLockRefundTxNonce(vkbv)
lock_refund_output_n, blinded_info = self.findOutputByNonce(lock_refund_tx_obj, nonce)
ensure(lock_refund_output_n is not None, 'Output not found in tx')
lock_refund_txo_value = make_int(blinded_info['amount'])
# Check script
lock_refund_txo_scriptpk = bytes.fromhex(lock_refund_tx_obj['vout'][lock_refund_output_n]['scriptPubKey']['hex'])
script_pk = CScript([OP_0, hashlib.sha256(script_out).digest()])
ensure(lock_refund_txo_scriptpk == script_pk, 'Bad output script')
A, B, csv_val, C = self.extractScriptLockRefundScriptValues(script_out)
ensure(A == Kal, 'Bad script pubkey')
ensure(B == Kaf, 'Bad script pubkey')
ensure(csv_val == csv_val_expect, 'Bad script csv value')
ensure(C == Kaf, 'Bad script pubkey')
# Check rangeproofs and commitments sum
lock_tx_obj = self.rpc_callback('decoderawtransaction', [lock_tx_bytes.hex()])
prevout = lock_tx_obj['vout'][prevout_n]
prevtxns = [{'txid': prevout_id.hex(), 'vout': prevout_n, 'scriptPubKey': prevout['scriptPubKey']['hex'], 'amount_commitment': prevout['valueCommitment']}]
rv = self.rpc_callback('verifyrawtransaction', [tx_bytes.hex(), prevtxns])
ensure(rv['outputs_valid'] is True, 'Invalid outputs')
ensure(rv['inputs_valid'] is True, 'Invalid inputs')
# Check value
fee_paid = make_int(lock_refund_tx_obj['vout'][0]['ct_fee'])
ensure(swap_value - lock_refund_txo_value == fee_paid, 'Bad output value')
# Check fee rate
dummy_witness_stack = self.getScriptLockTxDummyWitness(prevout_script)
witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack)
vsize = self.getTxVSize(self.loadTx(tx_bytes), add_witness_bytes=witness_bytes)
fee_rate_paid = fee_paid * 1000 // vsize
self._log.info('vsize, feerate: %ld, %ld', vsize, fee_rate_paid)
ensure(self.compareFeeRates(fee_rate_paid, feerate), 'Bad fee rate, expected: {}'.format(feerate))
return bytes.fromhex(lock_refund_txid_hex), lock_refund_txo_value, lock_refund_output_n
def verifySCLockRefundSpendTx(self, tx_bytes, lock_refund_tx_bytes,
lock_refund_tx_id, prevout_script,
Kal,
prevout_n, prevout_value, feerate, vkbv):
lock_refund_spend_tx_obj = self.rpc_callback('decoderawtransaction', [tx_bytes.hex()])
lock_refund_spend_txid_hex = lock_refund_spend_tx_obj['txid']
self._log.info('Verifying lock refund spend tx: {}.'.format(lock_refund_spend_txid_hex))
ensure(lock_refund_spend_tx_obj['version'] == self.txVersion(), 'Bad version')
ensure(lock_refund_spend_tx_obj['locktime'] == 0, 'Bad nLockTime')
ensure(len(lock_refund_spend_tx_obj['vin']) == 1, 'tx doesn\'t have one input')
txin = lock_refund_spend_tx_obj['vin'][0]
ensure(txin['sequence'] == 0, 'Bad input nSequence')
ensure(txin['scriptSig']['hex'] == '', 'Input scriptsig not empty')
ensure(txin['txid'] == lock_refund_tx_id.hex() and txin['vout'] == prevout_n, 'Input prevout mismatch')
ensure(len(lock_refund_spend_tx_obj['vout']) == 3, 'tx doesn\'t have three outputs')
# Leader picks output destinations
# Follower is not concerned with them as they pay to leader
# Check rangeproofs and commitments sum
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [lock_refund_tx_bytes.hex()])
prevout = lock_refund_tx_obj['vout'][prevout_n]
prevtxns = [{'txid': lock_refund_tx_id.hex(), 'vout': prevout_n, 'scriptPubKey': prevout['scriptPubKey']['hex'], 'amount_commitment': prevout['valueCommitment']}]
rv = self.rpc_callback('verifyrawtransaction', [tx_bytes.hex(), prevtxns])
ensure(rv['outputs_valid'] is True, 'Invalid outputs')
ensure(rv['inputs_valid'] is True, 'Invalid inputs')
# Check fee rate
dummy_witness_stack = self.getScriptLockRefundSpendTxDummyWitness(prevout_script)
witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack)
vsize = self.getTxVSize(self.loadTx(tx_bytes), add_witness_bytes=witness_bytes)
fee_paid = make_int(lock_refund_spend_tx_obj['vout'][0]['ct_fee'])
fee_rate_paid = fee_paid * 1000 // vsize
ensure(self.compareFeeRates(fee_rate_paid, feerate), 'Bad fee rate, expected: {}'.format(feerate))
return True
def getLockTxSwapOutputValue(self, bid, xmr_swap):
lock_tx_obj = self.rpc_callback('decoderawtransaction', [xmr_swap.a_lock_tx.hex()])
nonce = self.getScriptLockTxNonce(xmr_swap.vkbv)
output_n, _ = self.findOutputByNonce(lock_tx_obj, nonce)
ensure(output_n is not None, 'Output not found in tx')
return bytes.fromhex(lock_tx_obj['vout'][output_n]['valueCommitment'])
def getLockRefundTxSwapOutputValue(self, bid, xmr_swap):
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [xmr_swap.a_lock_refund_tx.hex()])
nonce = self.getScriptLockRefundTxNonce(xmr_swap.vkbv)
output_n, _ = self.findOutputByNonce(lock_refund_tx_obj, nonce)
ensure(output_n is not None, 'Output not found in tx')
return bytes.fromhex(lock_refund_tx_obj['vout'][output_n]['valueCommitment'])
def getLockRefundTxSwapOutput(self, xmr_swap):
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [xmr_swap.a_lock_refund_tx.hex()])
nonce = self.getScriptLockRefundTxNonce(xmr_swap.vkbv)
output_n, _ = self.findOutputByNonce(lock_refund_tx_obj, nonce)
ensure(output_n is not None, 'Output not found in tx')
return output_n
def createSCLockSpendTx(self, tx_lock_bytes, script_lock, pk_dest, tx_fee_rate, vkbv):
lock_tx_obj = self.rpc_callback('decoderawtransaction', [tx_lock_bytes.hex()])
lock_txid_hex = lock_tx_obj['txid']
ensure(lock_tx_obj['version'] == self.txVersion(), 'Bad version')
ensure(lock_tx_obj['locktime'] == 0, 'Bad nLockTime')
# Find the output of the lock tx to verify
nonce = self.getScriptLockTxNonce(vkbv)
spend_n, blinded_info = self.findOutputByNonce(lock_tx_obj, nonce)
ensure(spend_n is not None, 'Output not found in tx')
addr_out = self.pubkey_to_address(pk_dest)
inputs = [{'txid': lock_txid_hex, 'vout': spend_n, 'sequence': 0, 'blindingfactor': blinded_info['blind']}]
outputs = [{'type': 'blind', 'amount': blinded_info['amount'], 'address': addr_out, 'pubkey': pk_dest.hex()}]
params = [inputs, outputs]
rv = self.rpc_callback('createrawparttransaction', params)
lock_spend_tx_hex = rv['hex']
# Set dummy witness data for fee estimation
dummy_witness_stack = self.getScriptLockTxDummyWitness(script_lock)
# Use a junk change pubkey to avoid adding unused keys to the wallet
zero_change_key = i2b(self.getNewSecretKey())
zero_change_pubkey = self.getPubkey(zero_change_key)
inputs_info = {'0': {'value': blinded_info['amount'], 'blind': blinded_info['blind'], 'witnessstack': dummy_witness_stack}}
outputs_info = rv['amounts']
options = {
'changepubkey': zero_change_pubkey.hex(),
'feeRate': self.format_amount(tx_fee_rate),
'subtractFeeFromOutputs': [0, ]
}
rv = self.rpc_callback('fundrawtransactionfrom', ['blind', lock_spend_tx_hex, inputs_info, outputs_info, options])
lock_spend_tx_hex = rv['hex']
lock_spend_tx_obj = self.rpc_callback('decoderawtransaction', [lock_spend_tx_hex])
vsize = lock_spend_tx_obj['vsize']
pay_fee = make_int(lock_spend_tx_obj['vout'][0]['ct_fee'])
actual_tx_fee_rate = pay_fee * 1000 // vsize
self._log.info('createSCLockSpendTx %s:\n fee_rate, vsize, fee: %ld, %ld, %ld.',
lock_spend_tx_obj['txid'], actual_tx_fee_rate, vsize, pay_fee)
return bytes.fromhex(lock_spend_tx_hex)
def verifySCLockSpendTx(self, tx_bytes,
lock_tx_bytes, lock_tx_script,
a_pk_f, feerate, vkbv):
lock_spend_tx_obj = self.rpc_callback('decoderawtransaction', [tx_bytes.hex()])
lock_spend_txid_hex = lock_spend_tx_obj['txid']
self._log.info('Verifying lock spend tx: {}.'.format(lock_spend_txid_hex))
ensure(lock_spend_tx_obj['version'] == self.txVersion(), 'Bad version')
ensure(lock_spend_tx_obj['locktime'] == 0, 'Bad nLockTime')
ensure(len(lock_spend_tx_obj['vin']) == 1, 'tx doesn\'t have one input')
lock_tx_obj = self.rpc_callback('decoderawtransaction', [lock_tx_bytes.hex()])
lock_txid_hex = lock_tx_obj['txid']
# Find the output of the lock tx to verify
nonce = self.getScriptLockTxNonce(vkbv)
spend_n, input_blinded_info = self.findOutputByNonce(lock_tx_obj, nonce)
ensure(spend_n is not None, 'Output not found in tx')
txin = lock_spend_tx_obj['vin'][0]
ensure(txin['sequence'] == 0, 'Bad input nSequence')
ensure(txin['scriptSig']['hex'] == '', 'Input scriptsig not empty')
ensure(txin['txid'] == lock_txid_hex and txin['vout'] == spend_n, 'Input prevout mismatch')
ensure(len(lock_spend_tx_obj['vout']) == 3, 'tx doesn\'t have three outputs')
addr_out = self.pubkey_to_address(a_pk_f)
privkey = self.rpc_callback('dumpprivkey', [addr_out])
# Find output:
output_blinded_info = None
output_n = None
for txo in lock_spend_tx_obj['vout']:
if txo['type'] != 'blind':
continue
try:
output_blinded_info = self.rpc_callback('rewindrangeproof', [txo['rangeproof'], txo['valueCommitment'], privkey, txo['data_hex']])
output_n = txo['n']
break
except Exception as e:
self._log.debug('Searching for locked output: {}'.format(str(e)))
pass
ensure(output_n is not None, 'Output not found in tx')
# Commitment
v = self.rpc_callback('verifycommitment', [lock_spend_tx_obj['vout'][output_n]['valueCommitment'], output_blinded_info['blind'], output_blinded_info['amount']])
ensure(v['result'] is True, 'verifycommitment failed')
# Check rangeproofs and commitments sum
prevout = lock_tx_obj['vout'][spend_n]
prevtxns = [{'txid': lock_txid_hex, 'vout': spend_n, 'scriptPubKey': prevout['scriptPubKey']['hex'], 'amount_commitment': prevout['valueCommitment']}]
rv = self.rpc_callback('verifyrawtransaction', [tx_bytes.hex(), prevtxns])
ensure(rv['outputs_valid'] is True, 'Invalid outputs')
ensure(rv['inputs_valid'] is True, 'Invalid inputs')
# Check amount
fee_paid = make_int(lock_spend_tx_obj['vout'][0]['ct_fee'])
amount_difference = make_int(input_blinded_info['amount']) - make_int(output_blinded_info['amount'])
ensure(fee_paid == amount_difference, 'Invalid output amount')
# Check fee
dummy_witness_stack = self.getScriptLockTxDummyWitness(lock_tx_script)
witness_bytes = self.getWitnessStackSerialisedLength(dummy_witness_stack)
vsize = self.getTxVSize(self.loadTx(tx_bytes), add_witness_bytes=witness_bytes)
fee_rate_paid = fee_paid * 1000 // vsize
self._log.info('vsize, feerate: %ld, %ld', vsize, fee_rate_paid)
if not self.compareFeeRates(fee_rate_paid, feerate):
raise ValueError('Bad fee rate, expected: {}'.format(feerate))
return True
def createSCLockRefundSpendToFTx(self, tx_lock_refund_bytes, script_lock_refund, pkh_dest, tx_fee_rate, vkbv):
# lock refund swipe tx
# Sends the coinA locked coin to the follower
lock_refund_tx_obj = self.rpc_callback('decoderawtransaction', [tx_lock_refund_bytes.hex()])
nonce = self.getScriptLockRefundTxNonce(vkbv)
# Find the output of the lock refund tx to spend
spend_n, input_blinded_info = self.findOutputByNonce(lock_refund_tx_obj, nonce)
ensure(spend_n is not None, 'Output not found in tx')
tx_lock_refund_id = lock_refund_tx_obj['txid']
addr_out = self.pkh_to_address(pkh_dest)
addr_info = self.rpc_callback('getaddressinfo', [addr_out])
output_pubkey_hex = addr_info['pubkey']
A, B, lock2_value, C = self.extractScriptLockRefundScriptValues(script_lock_refund)
# Follower won't be able to decode output to check amount, shouldn't matter as fee is public and output is to leader, sum has to balance
inputs = [{'txid': tx_lock_refund_id, 'vout': spend_n, 'sequence': lock2_value, 'blindingfactor': input_blinded_info['blind']}]
outputs = [{'type': 'blind', 'amount': input_blinded_info['amount'], 'address': addr_out, 'pubkey': output_pubkey_hex}]
params = [inputs, outputs]
rv = self.rpc_callback('createrawparttransaction', params)
lock_refund_swipe_tx_hex = rv['hex']
# Set dummy witness data for fee estimation
dummy_witness_stack = self.getScriptLockRefundSwipeTxDummyWitness(script_lock_refund)
# Use a junk change pubkey to avoid adding unused keys to the wallet
zero_change_key = i2b(self.getNewSecretKey())
zero_change_pubkey = self.getPubkey(zero_change_key)
inputs_info = {'0': {'value': input_blinded_info['amount'], 'blind': input_blinded_info['blind'], 'witnessstack': dummy_witness_stack}}
outputs_info = rv['amounts']
options = {
'changepubkey': zero_change_pubkey.hex(),
'feeRate': self.format_amount(tx_fee_rate),
'subtractFeeFromOutputs': [0, ]
}
rv = self.rpc_callback('fundrawtransactionfrom', ['blind', lock_refund_swipe_tx_hex, inputs_info, outputs_info, options])
lock_refund_swipe_tx_hex = rv['hex']
return bytes.fromhex(lock_refund_swipe_tx_hex)
def getSpendableBalance(self) -> int:
return self.make_int(self.rpc_callback('getbalances')['mine']['blind_trusted'])
def publishBLockTx(self, vkbv, Kbs, output_amount, feerate, delay_for: int = 10, unlock_time: int = 0) -> bytes:
Kbv = self.getPubkey(vkbv)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
self._log.debug('sx_addr: {}'.format(sx_addr))
# TODO: Fund from other balances
params = ['blind', 'blind',
[{'address': sx_addr, 'amount': self.format_amount(output_amount)}, ],
'', '', self._anon_tx_ring_size, 1, False,
{'conf_target': self._conf_target, 'blind_watchonly_visible': True}]
txid = self.rpc_callback('sendtypeto', params)
return bytes.fromhex(txid)
def findTxB(self, kbv, Kbs, cb_swap_value, cb_block_confirmed, restore_height, bid_sender):
Kbv = self.getPubkey(kbv)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
# Tx recipient must import the stealth address as watch only
if bid_sender:
cb_swap_value *= -1
else:
addr_info = self.rpc_callback('getaddressinfo', [sx_addr])
if not addr_info['iswatchonly']:
wif_prefix = self.chainparams_network()['key_prefix']
wif_scan_key = toWIF(wif_prefix, kbv)
self.rpc_callback('importstealthaddress', [wif_scan_key, Kbs.hex()])
self._log.info('Imported watch-only sx_addr: {}'.format(sx_addr))
self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
self.rpc_callback('rescanblockchain', [restore_height])
params = [{'include_watchonly': True, 'search': sx_addr}]
txns = self.rpc_callback('filtertransactions', params)
if len(txns) == 1:
tx = txns[0]
assert (tx['outputs'][0]['stealth_address'] == sx_addr) # Should not be possible
ensure(tx['outputs'][0]['type'] == 'blind', 'Output is not anon')
if make_int(tx['outputs'][0]['amount']) == cb_swap_value:
height = 0
if tx['confirmations'] > 0:
chain_height = self.rpc_callback('getblockcount')
height = chain_height - (tx['confirmations'] - 1)
return {'txid': tx['txid'], 'amount': cb_swap_value, 'height': height}
else:
self._log.warning('Incorrect amount detected for coin b lock txn: {}'.format(tx['txid']))
return -1
return None
def spendBLockTx(self, chain_b_lock_txid, address_to, kbv, kbs, cb_swap_value, b_fee, restore_height, spend_actual_balance=False):
Kbv = self.getPubkey(kbv)
Kbs = self.getPubkey(kbs)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
addr_info = self.rpc_callback('getaddressinfo', [sx_addr])
if not addr_info['ismine']:
wif_prefix = self.chainparams_network()['key_prefix']
wif_scan_key = toWIF(wif_prefix, kbv)
wif_spend_key = toWIF(wif_prefix, kbs)
self.rpc_callback('importstealthaddress', [wif_scan_key, wif_spend_key])
self._log.info('Imported spend key for sx_addr: {}'.format(sx_addr))
self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
self.rpc_callback('rescanblockchain', [restore_height])
# TODO: Remove workaround
# utxos = self.rpc_callback('listunspentblind', [1, 9999999, [sx_addr]])
utxos = []
all_utxos = self.rpc_callback('listunspentblind', [1, 9999999])
for utxo in all_utxos:
if utxo.get('stealth_address', '_') == sx_addr:
utxos.append(utxo)
if len(utxos) < 1:
raise TemporaryError('No spendable outputs')
elif len(utxos) > 1:
raise ValueError('Too many spendable outputs')
utxo = utxos[0]
utxo_sats = make_int(utxo['amount'])
if spend_actual_balance and utxo_sats != cb_swap_value:
self._log.warning('Spending actual balance {}, not swap value {}.'.format(utxo_sats, cb_swap_value))
cb_swap_value = utxo_sats
inputs = [{'tx': utxo['txid'], 'n': utxo['vout']}, ]
params = ['blind', 'blind',
[{'address': address_to, 'amount': self.format_amount(cb_swap_value), 'subfee': True}, ],
'', '', self._anon_tx_ring_size, 1, False,
{'conf_target': self._conf_target, 'inputs': inputs, 'show_fee': True}]
rv = self.rpc_callback('sendtypeto', params)
return bytes.fromhex(rv['txid'])
def findTxnByHash(self, txid_hex):
# txindex is enabled for Particl
try:
rv = self.rpc_callback('getrawtransaction', [txid_hex, True])
except Exception as ex:
self._log.debug('findTxnByHash getrawtransaction failed: {}'.format(txid_hex))
return None
if 'confirmations' in rv and rv['confirmations'] >= self.blocks_confirmed:
return {'txid': txid_hex, 'amount': 0, 'height': rv['height']}
return None
def createRawFundedTransaction(self, addr_to: str, amount: int, sub_fee: bool = False, lock_unspents: bool = True) -> str:
txn = self.rpc_callback('createrawtransaction', [[], {addr_to: self.format_amount(amount)}])
options = {
'lockUnspents': lock_unspents,
'conf_target': self._conf_target,
}
if sub_fee:
options['subtractFeeFromOutputs'] = [0,]
return self.rpc_callback('fundrawtransactionfrom', ['blind', txn, options])['hex']
class PARTInterfaceAnon(PARTInterface):
@staticmethod
def balance_type():
return BalanceTypes.ANON
@staticmethod
def depth_spendable() -> int:
return 12
def coin_name(self):
return super().coin_name() + ' Anon'
def publishBLockTx(self, kbv, Kbs, output_amount, feerate, delay_for: int = 10, unlock_time: int = 0) -> bytes:
Kbv = self.getPubkey(kbv)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
# TODO: Fund from other balances
params = ['anon', 'anon',
[{'address': sx_addr, 'amount': self.format_amount(output_amount)}, ],
'', '', self._anon_tx_ring_size, 1, False,
{'conf_target': self._conf_target, 'blind_watchonly_visible': True}]
txid = self.rpc_callback('sendtypeto', params)
return bytes.fromhex(txid)
def findTxB(self, kbv, Kbs, cb_swap_value, cb_block_confirmed, restore_height, bid_sender):
Kbv = self.getPubkey(kbv)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
self._log.debug('sx_addr: {}'.format(sx_addr))
# Tx recipient must import the stealth address as watch only
if bid_sender:
cb_swap_value *= -1
else:
addr_info = self.rpc_callback('getaddressinfo', [sx_addr])
if not addr_info['iswatchonly']:
wif_prefix = self.chainparams_network()['key_prefix']
wif_scan_key = toWIF(wif_prefix, kbv)
self.rpc_callback('importstealthaddress', [wif_scan_key, Kbs.hex()])
self._log.info('Imported watch-only sx_addr: {}'.format(sx_addr))
self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
self.rpc_callback('rescanblockchain', [restore_height])
params = [{'include_watchonly': True, 'search': sx_addr}]
txns = self.rpc_callback('filtertransactions', params)
if len(txns) == 1:
tx = txns[0]
assert (tx['outputs'][0]['stealth_address'] == sx_addr) # Should not be possible
ensure(tx['outputs'][0]['type'] == 'anon', 'Output is not anon')
if make_int(tx['outputs'][0]['amount']) == cb_swap_value:
height = 0
if tx['confirmations'] > 0:
chain_height = self.rpc_callback('getblockcount')
height = chain_height - (tx['confirmations'] - 1)
return {'txid': tx['txid'], 'amount': cb_swap_value, 'height': height}
else:
self._log.warning('Incorrect amount detected for coin b lock txn: {}'.format(tx['txid']))
return -1
return None
def spendBLockTx(self, chain_b_lock_txid, address_to, kbv, kbs, cb_swap_value, b_fee, restore_height, spend_actual_balance=False):
Kbv = self.getPubkey(kbv)
Kbs = self.getPubkey(kbs)
sx_addr = self.formatStealthAddress(Kbv, Kbs)
addr_info = self.rpc_callback('getaddressinfo', [sx_addr])
if not addr_info['ismine']:
wif_prefix = self.chainparams_network()['key_prefix']
wif_scan_key = toWIF(wif_prefix, kbv)
wif_spend_key = toWIF(wif_prefix, kbs)
self.rpc_callback('importstealthaddress', [wif_scan_key, wif_spend_key])
self._log.info('Imported spend key for sx_addr: {}'.format(sx_addr))
self._log.info('Rescanning {} chain from height: {}'.format(self.coin_name(), restore_height))
self.rpc_callback('rescanblockchain', [restore_height])
autxos = self.rpc_callback('listunspentanon', [1, 9999999, [sx_addr]])
if len(autxos) < 1:
raise TemporaryError('No spendable outputs')
elif len(autxos) > 1:
raise ValueError('Too many spendable outputs')
utxo = autxos[0]
utxo_sats = make_int(utxo['amount'])
if spend_actual_balance and utxo_sats != cb_swap_value:
self._log.warning('Spending actual balance {}, not swap value {}.'.format(utxo_sats, cb_swap_value))
cb_swap_value = utxo_sats
inputs = [{'tx': utxo['txid'], 'n': utxo['vout']}, ]
params = ['anon', 'anon',
[{'address': address_to, 'amount': self.format_amount(cb_swap_value), 'subfee': True}, ],
'', '', self._anon_tx_ring_size, 1, False,
{'conf_target': self._conf_target, 'inputs': inputs, 'show_fee': True}]
rv = self.rpc_callback('sendtypeto', params)
return bytes.fromhex(rv['txid'])
def findTxnByHash(self, txid_hex: str):
# txindex is enabled for Particl
try:
rv = self.rpc_callback('getrawtransaction', [txid_hex, True])
except Exception as ex:
self._log.debug('findTxnByHash getrawtransaction failed: {}'.format(txid_hex))
return None
if 'confirmations' in rv and rv['confirmations'] >= self.blocks_confirmed:
return {'txid': txid_hex, 'amount': 0, 'height': rv['height']}
return None
def getSpendableBalance(self) -> int:
return self.make_int(self.rpc_callback('getbalances')['mine']['anon_trusted'])