#!/usr/bin/env python # -*- coding: utf-8 -*- # Copyright (c) 2020-2022 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'): return self.rpc_callback('getnewaddress', [label]) def getNewStealthAddress(self, label='swap_stealth'): 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): 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): 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'] 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, Kal, Kaf, vkbv): script = self.genScriptLockTxScript(Kal, Kaf) # 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, script 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): return self.make_int(self.rpc_callback('getbalances')['mine']['blind_trusted']) 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): sx_addr = self.formatStealthAddress(Kbv, Kbs) self._log.debug('sx_addr: {}'.format(sx_addr)) # 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): # 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): return self.make_int(self.rpc_callback('getbalances')['mine']['anon_trusted'])