maxmustermann/dogecoin
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
dogecoin/test/functional/p2p_segwit.py
John Newbery eebcdfa86a [test] rename SegwitVersion1SignatureHash() 
The function implementing segwit v0 signature hash was originally named
SegwitVersion1SignatureHash() (presumably before segwit v0 was named
segwit v0). Rename it to SegwitV0SignatureHash().

Also rename SignatureHash() to LegacySignatureHash() for disambiguation.
2019-10-14 17:13:05 -04:00

2064 lines
93 KiB
Python
Executable file
Raw Blame History

#!/usr/bin/env python3
# Copyright (c) 2016-2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test segwit transactions and blocks on P2P network."""
import math
import random
import struct
import time
from test_framework.blocktools import create_block, create_coinbase, add_witness_commitment, get_witness_script, WITNESS_COMMITMENT_HEADER
from test_framework.key import ECKey
from test_framework.messages import (
BIP125_SEQUENCE_NUMBER,
CBlock,
CBlockHeader,
CInv,
COutPoint,
CTransaction,
CTxIn,
CTxInWitness,
CTxOut,
CTxWitness,
MAX_BLOCK_BASE_SIZE,
MSG_WITNESS_FLAG,
NODE_NETWORK,
NODE_WITNESS,
msg_no_witness_block,
msg_getdata,
msg_headers,
msg_inv,
msg_tx,
msg_block,
msg_witness_tx,
ser_uint256,
ser_vector,
sha256,
uint256_from_str,
FromHex,
)
from test_framework.mininode import (
P2PInterface,
mininode_lock,
)
from test_framework.script import (
CScript,
CScriptNum,
CScriptOp,
MAX_SCRIPT_ELEMENT_SIZE,
OP_0,
OP_1,
OP_16,
OP_2DROP,
OP_CHECKMULTISIG,
OP_CHECKSIG,
OP_DROP,
OP_DUP,
OP_ELSE,
OP_ENDIF,
OP_EQUAL,
OP_EQUALVERIFY,
OP_HASH160,
OP_IF,
OP_RETURN,
OP_TRUE,
SIGHASH_ALL,
SIGHASH_ANYONECANPAY,
SIGHASH_NONE,
SIGHASH_SINGLE,
SegwitV0SignatureHash,
LegacySignatureHash,
hash160,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
connect_nodes,
disconnect_nodes,
softfork_active,
hex_str_to_bytes,
assert_raises_rpc_error,
)
# The versionbit bit used to signal activation of SegWit
VB_WITNESS_BIT = 1
VB_PERIOD = 144
VB_TOP_BITS = 0x20000000
MAX_SIGOP_COST = 80000
SEGWIT_HEIGHT = 120
class UTXO():
"""Used to keep track of anyone-can-spend outputs that we can use in the tests."""
def __init__(self, sha256, n, value):
self.sha256 = sha256
self.n = n
self.nValue = value
def get_p2pkh_script(pubkeyhash):
"""Get the script associated with a P2PKH."""
return CScript([CScriptOp(OP_DUP), CScriptOp(OP_HASH160), pubkeyhash, CScriptOp(OP_EQUALVERIFY), CScriptOp(OP_CHECKSIG)])
def sign_p2pk_witness_input(script, tx_to, in_idx, hashtype, value, key):
"""Add signature for a P2PK witness program."""
tx_hash = SegwitV0SignatureHash(script, tx_to, in_idx, hashtype, value)
signature = key.sign_ecdsa(tx_hash) + chr(hashtype).encode('latin-1')
tx_to.wit.vtxinwit[in_idx].scriptWitness.stack = [signature, script]
tx_to.rehash()
def get_virtual_size(witness_block):
"""Calculate the virtual size of a witness block.
Virtual size is base + witness/4."""
base_size = len(witness_block.serialize(with_witness=False))
total_size = len(witness_block.serialize())
# the "+3" is so we round up
vsize = int((3 * base_size + total_size + 3) / 4)
return vsize
def test_transaction_acceptance(node, p2p, tx, with_witness, accepted, reason=None):
"""Send a transaction to the node and check that it's accepted to the mempool
- Submit the transaction over the p2p interface
- use the getrawmempool rpc to check for acceptance."""
reason = [reason] if reason else []
with node.assert_debug_log(expected_msgs=reason):
p2p.send_message(msg_witness_tx(tx) if with_witness else msg_tx(tx))
p2p.sync_with_ping()
assert_equal(tx.hash in node.getrawmempool(), accepted)
def test_witness_block(node, p2p, block, accepted, with_witness=True, reason=None):
"""Send a block to the node and check that it's accepted
- Submit the block over the p2p interface
- use the getbestblockhash rpc to check for acceptance."""
reason = [reason] if reason else []
with node.assert_debug_log(expected_msgs=reason):
p2p.send_message(msg_block(block) if with_witness else msg_no_witness_block(block))
p2p.sync_with_ping()
assert_equal(node.getbestblockhash() == block.hash, accepted)
class TestP2PConn(P2PInterface):
def __init__(self):
super().__init__()
self.getdataset = set()
def on_getdata(self, message):
for inv in message.inv:
self.getdataset.add(inv.hash)
def announce_tx_and_wait_for_getdata(self, tx, timeout=60, success=True):
with mininode_lock:
self.last_message.pop("getdata", None)
self.send_message(msg_inv(inv=[CInv(1, tx.sha256)]))
if success:
self.wait_for_getdata(timeout)
else:
time.sleep(timeout)
assert not self.last_message.get("getdata")
def announce_block_and_wait_for_getdata(self, block, use_header, timeout=60):
with mininode_lock:
self.last_message.pop("getdata", None)
self.last_message.pop("getheaders", None)
msg = msg_headers()
msg.headers = [CBlockHeader(block)]
if use_header:
self.send_message(msg)
else:
self.send_message(msg_inv(inv=[CInv(2, block.sha256)]))
self.wait_for_getheaders()
self.send_message(msg)
self.wait_for_getdata()
def request_block(self, blockhash, inv_type, timeout=60):
with mininode_lock:
self.last_message.pop("block", None)
self.send_message(msg_getdata(inv=[CInv(inv_type, blockhash)]))
self.wait_for_block(blockhash, timeout)
return self.last_message["block"].block
class SegWitTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 3
# This test tests SegWit both pre and post-activation, so use the normal BIP9 activation.
self.extra_args = [
["-whitelist=127.0.0.1", "-acceptnonstdtxn=1", "-segwitheight={}".format(SEGWIT_HEIGHT)],
["-whitelist=127.0.0.1", "-acceptnonstdtxn=0", "-segwitheight={}".format(SEGWIT_HEIGHT)],
["-whitelist=127.0.0.1", "-acceptnonstdtxn=1", "-segwitheight=-1"]
]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def setup_network(self):
self.setup_nodes()
connect_nodes(self.nodes[0], 1)
connect_nodes(self.nodes[0], 2)
self.sync_all()
# Helper functions
def build_next_block(self, version=4):
"""Build a block on top of node0's tip."""
tip = self.nodes[0].getbestblockhash()
height = self.nodes[0].getblockcount() + 1
block_time = self.nodes[0].getblockheader(tip)["mediantime"] + 1
block = create_block(int(tip, 16), create_coinbase(height), block_time)
block.nVersion = version
block.rehash()
return block
def update_witness_block_with_transactions(self, block, tx_list, nonce=0):
"""Add list of transactions to block, adds witness commitment, then solves."""
block.vtx.extend(tx_list)
add_witness_commitment(block, nonce)
block.solve()
def run_test(self):
# Setup the p2p connections
# self.test_node sets NODE_WITNESS|NODE_NETWORK
self.test_node = self.nodes[0].add_p2p_connection(TestP2PConn(), services=NODE_NETWORK | NODE_WITNESS)
# self.old_node sets only NODE_NETWORK
self.old_node = self.nodes[0].add_p2p_connection(TestP2PConn(), services=NODE_NETWORK)
# self.std_node is for testing node1 (fRequireStandard=true)
self.std_node = self.nodes[1].add_p2p_connection(TestP2PConn(), services=NODE_NETWORK | NODE_WITNESS)
assert self.test_node.nServices & NODE_WITNESS != 0
# Keep a place to store utxo's that can be used in later tests
self.utxo = []
self.log.info("Starting tests before segwit activation")
self.segwit_active = False
self.test_non_witness_transaction()
self.test_v0_outputs_arent_spendable()
self.test_block_relay()
self.test_getblocktemplate_before_lockin()
self.test_unnecessary_witness_before_segwit_activation()
self.test_witness_tx_relay_before_segwit_activation()
self.test_standardness_v0()
self.log.info("Advancing to segwit activation")
self.advance_to_segwit_active()
# Segwit status 'active'
self.test_p2sh_witness()
self.test_witness_commitments()
self.test_block_malleability()
self.test_witness_block_size()
self.test_submit_block()
self.test_extra_witness_data()
self.test_max_witness_push_length()
self.test_max_witness_program_length()
self.test_witness_input_length()
self.test_block_relay()
self.test_tx_relay_after_segwit_activation()
self.test_standardness_v0()
self.test_segwit_versions()
self.test_premature_coinbase_witness_spend()
self.test_uncompressed_pubkey()
self.test_signature_version_1()
self.test_non_standard_witness_blinding()
self.test_non_standard_witness()
self.test_upgrade_after_activation()
self.test_witness_sigops()
self.test_superfluous_witness()
# Individual tests
def subtest(func): # noqa: N805
"""Wraps the subtests for logging and state assertions."""
def func_wrapper(self, *args, **kwargs):
self.log.info("Subtest: {} (Segwit active = {})".format(func.__name__, self.segwit_active))
# Assert segwit status is as expected
assert_equal(softfork_active(self.nodes[0], 'segwit'), self.segwit_active)
func(self, *args, **kwargs)
# Each subtest should leave some utxos for the next subtest
assert self.utxo
self.sync_blocks()
# Assert segwit status is as expected at end of subtest
assert_equal(softfork_active(self.nodes[0], 'segwit'), self.segwit_active)
return func_wrapper
@subtest
def test_non_witness_transaction(self):
"""See if sending a regular transaction works, and create a utxo to use in later tests."""
# Mine a block with an anyone-can-spend coinbase,
# let it mature, then try to spend it.
block = self.build_next_block(version=1)
block.solve()
self.test_node.send_message(msg_no_witness_block(block))
self.test_node.sync_with_ping() # make sure the block was processed
txid = block.vtx[0].sha256
self.nodes[0].generate(99) # let the block mature
# Create a transaction that spends the coinbase
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(txid, 0), b""))
tx.vout.append(CTxOut(49 * 100000000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))
tx.calc_sha256()
# Check that serializing it with or without witness is the same
# This is a sanity check of our testing framework.
assert_equal(msg_tx(tx).serialize(), msg_witness_tx(tx).serialize())
self.test_node.send_message(msg_witness_tx(tx))
self.test_node.sync_with_ping() # make sure the tx was processed
assert tx.hash in self.nodes[0].getrawmempool()
# Save this transaction for later
self.utxo.append(UTXO(tx.sha256, 0, 49 * 100000000))
self.nodes[0].generate(1)
@subtest
def test_unnecessary_witness_before_segwit_activation(self):
"""Verify that blocks with witnesses are rejected before activation."""
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, CScript([OP_TRUE])))
tx.wit.vtxinwit.append(CTxInWitness())
tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([CScriptNum(1)])]
# Verify the hash with witness differs from the txid
# (otherwise our testing framework must be broken!)
tx.rehash()
assert tx.sha256 != tx.calc_sha256(with_witness=True)
# Construct a segwit-signaling block that includes the transaction.
block = self.build_next_block(version=(VB_TOP_BITS | (1 << VB_WITNESS_BIT)))
self.update_witness_block_with_transactions(block, [tx])
# Sending witness data before activation is not allowed (anti-spam
# rule).
test_witness_block(self.nodes[0], self.test_node, block, accepted=False, reason='unexpected-witness')
# But it should not be permanently marked bad...
# Resend without witness information.
self.test_node.send_message(msg_no_witness_block(block))
self.test_node.sync_with_ping()
assert_equal(self.nodes[0].getbestblockhash(), block.hash)
# Update our utxo list; we spent the first entry.
self.utxo.pop(0)
self.utxo.append(UTXO(tx.sha256, 0, tx.vout[0].nValue))
@subtest
def test_block_relay(self):
"""Test that block requests to NODE_WITNESS peer are with MSG_WITNESS_FLAG.
This is true regardless of segwit activation.
Also test that we don't ask for blocks from unupgraded peers."""
blocktype = 2 | MSG_WITNESS_FLAG
# test_node has set NODE_WITNESS, so all getdata requests should be for
# witness blocks.
# Test announcing a block via inv results in a getdata, and that
# announcing a version 4 or random VB block with a header results in a getdata
block1 = self.build_next_block()
block1.solve()
self.test_node.announce_block_and_wait_for_getdata(block1, use_header=False)
assert self.test_node.last_message["getdata"].inv[0].type == blocktype
test_witness_block(self.nodes[0], self.test_node, block1, True)
block2 = self.build_next_block(version=4)
block2.solve()
self.test_node.announce_block_and_wait_for_getdata(block2, use_header=True)
assert self.test_node.last_message["getdata"].inv[0].type == blocktype
test_witness_block(self.nodes[0], self.test_node, block2, True)
block3 = self.build_next_block(version=(VB_TOP_BITS | (1 << 15)))
block3.solve()
self.test_node.announce_block_and_wait_for_getdata(block3, use_header=True)
assert self.test_node.last_message["getdata"].inv[0].type == blocktype
test_witness_block(self.nodes[0], self.test_node, block3, True)
# Check that we can getdata for witness blocks or regular blocks,
# and the right thing happens.
if not self.segwit_active:
# Before activation, we should be able to request old blocks with
# or without witness, and they should be the same.
chain_height = self.nodes[0].getblockcount()
# Pick 10 random blocks on main chain, and verify that getdata's
# for MSG_BLOCK, MSG_WITNESS_BLOCK, and rpc getblock() are equal.
all_heights = list(range(chain_height + 1))
random.shuffle(all_heights)
all_heights = all_heights[0:10]
for height in all_heights:
block_hash = self.nodes[0].getblockhash(height)
rpc_block = self.nodes[0].getblock(block_hash, False)
block_hash = int(block_hash, 16)
block = self.test_node.request_block(block_hash, 2)
wit_block = self.test_node.request_block(block_hash, 2 | MSG_WITNESS_FLAG)
assert_equal(block.serialize(), wit_block.serialize())
assert_equal(block.serialize(), hex_str_to_bytes(rpc_block))
else:
# After activation, witness blocks and non-witness blocks should
# be different. Verify rpc getblock() returns witness blocks, while
# getdata respects the requested type.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [])
# This gives us a witness commitment.
assert len(block.vtx[0].wit.vtxinwit) == 1
assert len(block.vtx[0].wit.vtxinwit[0].scriptWitness.stack) == 1
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Now try to retrieve it...
rpc_block = self.nodes[0].getblock(block.hash, False)
non_wit_block = self.test_node.request_block(block.sha256, 2)
wit_block = self.test_node.request_block(block.sha256, 2 | MSG_WITNESS_FLAG)
assert_equal(wit_block.serialize(), hex_str_to_bytes(rpc_block))
assert_equal(wit_block.serialize(False), non_wit_block.serialize())
assert_equal(wit_block.serialize(), block.serialize())
# Test size, vsize, weight
rpc_details = self.nodes[0].getblock(block.hash, True)
assert_equal(rpc_details["size"], len(block.serialize()))
assert_equal(rpc_details["strippedsize"], len(block.serialize(False)))
weight = 3 * len(block.serialize(False)) + len(block.serialize())
assert_equal(rpc_details["weight"], weight)
# Upgraded node should not ask for blocks from unupgraded
block4 = self.build_next_block(version=4)
block4.solve()
self.old_node.getdataset = set()
# Blocks can be requested via direct-fetch (immediately upon processing the announcement)
# or via parallel download (with an indeterminate delay from processing the announcement)
# so to test that a block is NOT requested, we could guess a time period to sleep for,
# and then check. We can avoid the sleep() by taking advantage of transaction getdata's
# being processed after block getdata's, and announce a transaction as well,
# and then check to see if that particular getdata has been received.
# Since 0.14, inv's will only be responded to with a getheaders, so send a header
# to announce this block.
msg = msg_headers()
msg.headers = [CBlockHeader(block4)]
self.old_node.send_message(msg)
self.old_node.announce_tx_and_wait_for_getdata(block4.vtx[0])
assert block4.sha256 not in self.old_node.getdataset
@subtest
def test_v0_outputs_arent_spendable(self):
"""Test that v0 outputs aren't spendable before segwit activation.
~6 months after segwit activation, the SCRIPT_VERIFY_WITNESS flag was
backdated so that it applies to all blocks, going back to the genesis
block.
Consequently, version 0 witness outputs are never spendable without
witness, and so can't be spent before segwit activation (the point at which
blocks are permitted to contain witnesses)."""
# node2 doesn't need to be connected for this test.
# (If it's connected, node0 may propagate an invalid block to it over
# compact blocks and the nodes would have inconsistent tips.)
disconnect_nodes(self.nodes[0], 2)
# Create two outputs, a p2wsh and p2sh-p2wsh
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
p2sh_pubkey = hash160(script_pubkey)
p2sh_script_pubkey = CScript([OP_HASH160, p2sh_pubkey, OP_EQUAL])
value = self.utxo[0].nValue // 3
tx = CTransaction()
tx.vin = [CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b'')]
tx.vout = [CTxOut(value, script_pubkey), CTxOut(value, p2sh_script_pubkey)]
tx.vout.append(CTxOut(value, CScript([OP_TRUE])))
tx.rehash()
txid = tx.sha256
# Add it to a block
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
# Verify that segwit isn't activated. A block serialized with witness
# should be rejected prior to activation.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=True, reason='unexpected-witness')
# Now send the block without witness. It should be accepted
test_witness_block(self.nodes[0], self.test_node, block, accepted=True, with_witness=False)
# Now try to spend the outputs. This should fail since SCRIPT_VERIFY_WITNESS is always enabled.
p2wsh_tx = CTransaction()
p2wsh_tx.vin = [CTxIn(COutPoint(txid, 0), b'')]
p2wsh_tx.vout = [CTxOut(value, CScript([OP_TRUE]))]
p2wsh_tx.wit.vtxinwit.append(CTxInWitness())
p2wsh_tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])]
p2wsh_tx.rehash()
p2sh_p2wsh_tx = CTransaction()
p2sh_p2wsh_tx.vin = [CTxIn(COutPoint(txid, 1), CScript([script_pubkey]))]
p2sh_p2wsh_tx.vout = [CTxOut(value, CScript([OP_TRUE]))]
p2sh_p2wsh_tx.wit.vtxinwit.append(CTxInWitness())
p2sh_p2wsh_tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])]
p2sh_p2wsh_tx.rehash()
for tx in [p2wsh_tx, p2sh_p2wsh_tx]:
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
# When the block is serialized with a witness, the block will be rejected because witness
# data isn't allowed in blocks that don't commit to witness data.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=True, reason='unexpected-witness')
# When the block is serialized without witness, validation fails because the transaction is
# invalid (transactions are always validated with SCRIPT_VERIFY_WITNESS so a segwit v0 transaction
# without a witness is invalid).
# Note: The reject reason for this failure could be
# 'block-validation-failed' (if script check threads > 1) or
# 'non-mandatory-script-verify-flag (Witness program was passed an
# empty witness)' (otherwise).
# TODO: support multiple acceptable reject reasons.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False, with_witness=False)
connect_nodes(self.nodes[0], 2)
self.utxo.pop(0)
self.utxo.append(UTXO(txid, 2, value))
@subtest
def test_getblocktemplate_before_lockin(self):
txid = int(self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1), 16)
for node in [self.nodes[0], self.nodes[2]]:
gbt_results = node.getblocktemplate({"rules": ["segwit"]})
if node == self.nodes[2]:
# If this is a non-segwit node, we should not get a witness
# commitment.
assert 'default_witness_commitment' not in gbt_results
else:
# For segwit-aware nodes, check the witness
# commitment is correct.
assert 'default_witness_commitment' in gbt_results
witness_commitment = gbt_results['default_witness_commitment']
# Check that default_witness_commitment is present.
witness_root = CBlock.get_merkle_root([ser_uint256(0),
ser_uint256(txid)])
script = get_witness_script(witness_root, 0)
assert_equal(witness_commitment, script.hex())
# Clear out the mempool
self.nodes[0].generate(1)
self.sync_blocks()
@subtest
def test_witness_tx_relay_before_segwit_activation(self):
# Generate a transaction that doesn't require a witness, but send it
# with a witness. Should be rejected for premature-witness, but should
# not be added to recently rejected list.
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))
tx.wit.vtxinwit.append(CTxInWitness())
tx.wit.vtxinwit[0].scriptWitness.stack = [b'a']
tx.rehash()
tx_hash = tx.sha256
tx_value = tx.vout[0].nValue
# Verify that if a peer doesn't set nServices to include NODE_WITNESS,
# the getdata is just for the non-witness portion.
self.old_node.announce_tx_and_wait_for_getdata(tx)
assert self.old_node.last_message["getdata"].inv[0].type == 1
# Since we haven't delivered the tx yet, inv'ing the same tx from
# a witness transaction ought not result in a getdata.
self.test_node.announce_tx_and_wait_for_getdata(tx, timeout=2, success=False)
# Delivering this transaction with witness should fail (no matter who
# its from)
assert_equal(len(self.nodes[0].getrawmempool()), 0)
assert_equal(len(self.nodes[1].getrawmempool()), 0)
test_transaction_acceptance(self.nodes[0], self.old_node, tx, with_witness=True, accepted=False)
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=True, accepted=False)
# But eliminating the witness should fix it
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=False, accepted=True)
# Cleanup: mine the first transaction and update utxo
self.nodes[0].generate(1)
assert_equal(len(self.nodes[0].getrawmempool()), 0)
self.utxo.pop(0)
self.utxo.append(UTXO(tx_hash, 0, tx_value))
@subtest
def test_standardness_v0(self):
"""Test V0 txout standardness.
V0 segwit outputs and inputs are always standard.
V0 segwit inputs may only be mined after activation, but not before."""
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
p2sh_pubkey = hash160(witness_program)
p2sh_script_pubkey = CScript([OP_HASH160, p2sh_pubkey, OP_EQUAL])
# First prepare a p2sh output (so that spending it will pass standardness)
p2sh_tx = CTransaction()
p2sh_tx.vin = [CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b"")]
p2sh_tx.vout = [CTxOut(self.utxo[0].nValue - 1000, p2sh_script_pubkey)]
p2sh_tx.rehash()
# Mine it on test_node to create the confirmed output.
test_transaction_acceptance(self.nodes[0], self.test_node, p2sh_tx, with_witness=True, accepted=True)
self.nodes[0].generate(1)
self.sync_blocks()
# Now test standardness of v0 P2WSH outputs.
# Start by creating a transaction with two outputs.
tx = CTransaction()
tx.vin = [CTxIn(COutPoint(p2sh_tx.sha256, 0), CScript([witness_program]))]
tx.vout = [CTxOut(p2sh_tx.vout[0].nValue - 10000, script_pubkey)]
tx.vout.append(CTxOut(8000, script_pubkey)) # Might burn this later
tx.vin[0].nSequence = BIP125_SEQUENCE_NUMBER # Just to have the option to bump this tx from the mempool
tx.rehash()
# This is always accepted, since the mempool policy is to consider segwit as always active
# and thus allow segwit outputs
test_transaction_acceptance(self.nodes[1], self.std_node, tx, with_witness=True, accepted=True)
# Now create something that looks like a P2PKH output. This won't be spendable.
script_pubkey = CScript([OP_0, hash160(witness_hash)])
tx2 = CTransaction()
# tx was accepted, so we spend the second output.
tx2.vin = [CTxIn(COutPoint(tx.sha256, 1), b"")]
tx2.vout = [CTxOut(7000, script_pubkey)]
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
tx2.rehash()
test_transaction_acceptance(self.nodes[1], self.std_node, tx2, with_witness=True, accepted=True)
# Now update self.utxo for later tests.
tx3 = CTransaction()
# tx and tx2 were both accepted. Don't bother trying to reclaim the
# P2PKH output; just send tx's first output back to an anyone-can-spend.
self.sync_mempools([self.nodes[0], self.nodes[1]])
tx3.vin = [CTxIn(COutPoint(tx.sha256, 0), b"")]
tx3.vout = [CTxOut(tx.vout[0].nValue - 1000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE]))]
tx3.wit.vtxinwit.append(CTxInWitness())
tx3.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
tx3.rehash()
if not self.segwit_active:
# Just check mempool acceptance, but don't add the transaction to the mempool, since witness is disallowed
# in blocks and the tx is impossible to mine right now.
assert_equal(self.nodes[0].testmempoolaccept([tx3.serialize_with_witness().hex()]), [{'txid': tx3.hash, 'allowed': True}])
# Create the same output as tx3, but by replacing tx
tx3_out = tx3.vout[0]
tx3 = tx
tx3.vout = [tx3_out]
tx3.rehash()
assert_equal(self.nodes[0].testmempoolaccept([tx3.serialize_with_witness().hex()]), [{'txid': tx3.hash, 'allowed': True}])
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, with_witness=True, accepted=True)
self.nodes[0].generate(1)
self.sync_blocks()
self.utxo.pop(0)
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
assert_equal(len(self.nodes[1].getrawmempool()), 0)
@subtest
def advance_to_segwit_active(self):
"""Mine enough blocks to activate segwit."""
assert not softfork_active(self.nodes[0], 'segwit')
height = self.nodes[0].getblockcount()
self.nodes[0].generate(SEGWIT_HEIGHT - height - 2)
assert not softfork_active(self.nodes[0], 'segwit')
self.nodes[0].generate(1)
assert softfork_active(self.nodes[0], 'segwit')
self.segwit_active = True
@subtest
def test_p2sh_witness(self):
"""Test P2SH wrapped witness programs."""
# Prepare the p2sh-wrapped witness output
witness_program = CScript([OP_DROP, OP_TRUE])
witness_hash = sha256(witness_program)
p2wsh_pubkey = CScript([OP_0, witness_hash])
p2sh_witness_hash = hash160(p2wsh_pubkey)
script_pubkey = CScript([OP_HASH160, p2sh_witness_hash, OP_EQUAL])
script_sig = CScript([p2wsh_pubkey]) # a push of the redeem script
# Fund the P2SH output
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, script_pubkey))
tx.rehash()
# Verify mempool acceptance and block validity
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=False, accepted=True)
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True, with_witness=True)
self.sync_blocks()
# Now test attempts to spend the output.
spend_tx = CTransaction()
spend_tx.vin.append(CTxIn(COutPoint(tx.sha256, 0), script_sig))
spend_tx.vout.append(CTxOut(tx.vout[0].nValue - 1000, CScript([OP_TRUE])))
spend_tx.rehash()
# This transaction should not be accepted into the mempool pre- or
# post-segwit. Mempool acceptance will use SCRIPT_VERIFY_WITNESS which
# will require a witness to spend a witness program regardless of
# segwit activation. Note that older bitcoind's that are not
# segwit-aware would also reject this for failing CLEANSTACK.
with self.nodes[0].assert_debug_log(
expected_msgs=(spend_tx.hash, 'was not accepted: non-mandatory-script-verify-flag (Witness program was passed an empty witness)')):
test_transaction_acceptance(self.nodes[0], self.test_node, spend_tx, with_witness=False, accepted=False)
# Try to put the witness script in the scriptSig, should also fail.
spend_tx.vin[0].scriptSig = CScript([p2wsh_pubkey, b'a'])
spend_tx.rehash()
with self.nodes[0].assert_debug_log(
expected_msgs=(spend_tx.hash, 'was not accepted: mandatory-script-verify-flag-failed (Script evaluated without error but finished with a false/empty top stack element)')):
test_transaction_acceptance(self.nodes[0], self.test_node, spend_tx, with_witness=False, accepted=False)
# Now put the witness script in the witness, should succeed after
# segwit activates.
spend_tx.vin[0].scriptSig = script_sig
spend_tx.rehash()
spend_tx.wit.vtxinwit.append(CTxInWitness())
spend_tx.wit.vtxinwit[0].scriptWitness.stack = [b'a', witness_program]
# Verify mempool acceptance
test_transaction_acceptance(self.nodes[0], self.test_node, spend_tx, with_witness=True, accepted=True)
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [spend_tx])
# If we're after activation, then sending this with witnesses should be valid.
# This no longer works before activation, because SCRIPT_VERIFY_WITNESS
# is always set.
# TODO: rewrite this test to make clear that it only works after activation.
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Update self.utxo
self.utxo.pop(0)
self.utxo.append(UTXO(spend_tx.sha256, 0, spend_tx.vout[0].nValue))
@subtest
def test_witness_commitments(self):
"""Test witness commitments.
This test can only be run after segwit has activated."""
# First try a correct witness commitment.
block = self.build_next_block()
add_witness_commitment(block)
block.solve()
# Test the test -- witness serialization should be different
assert msg_block(block).serialize() != msg_no_witness_block(block).serialize()
# This empty block should be valid.
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Try to tweak the nonce
block_2 = self.build_next_block()
add_witness_commitment(block_2, nonce=28)
block_2.solve()
# The commitment should have changed!
assert block_2.vtx[0].vout[-1] != block.vtx[0].vout[-1]
# This should also be valid.
test_witness_block(self.nodes[0], self.test_node, block_2, accepted=True)
# Now test commitments with actual transactions
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
# Let's construct a witness program
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, script_pubkey))
tx.rehash()
# tx2 will spend tx1, and send back to a regular anyone-can-spend address
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, witness_program))
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
tx2.rehash()
block_3 = self.build_next_block()
self.update_witness_block_with_transactions(block_3, [tx, tx2], nonce=1)
# Add an extra OP_RETURN output that matches the witness commitment template,
# even though it has extra data after the incorrect commitment.
# This block should fail.
block_3.vtx[0].vout.append(CTxOut(0, CScript([OP_RETURN, WITNESS_COMMITMENT_HEADER + ser_uint256(2), 10])))
block_3.vtx[0].rehash()
block_3.hashMerkleRoot = block_3.calc_merkle_root()
block_3.rehash()
block_3.solve()
test_witness_block(self.nodes[0], self.test_node, block_3, accepted=False)
# Add a different commitment with different nonce, but in the
# right location, and with some funds burned(!).
# This should succeed (nValue shouldn't affect finding the
# witness commitment).
add_witness_commitment(block_3, nonce=0)
block_3.vtx[0].vout[0].nValue -= 1
block_3.vtx[0].vout[-1].nValue += 1
block_3.vtx[0].rehash()
block_3.hashMerkleRoot = block_3.calc_merkle_root()
block_3.rehash()
assert len(block_3.vtx[0].vout) == 4 # 3 OP_returns
block_3.solve()
test_witness_block(self.nodes[0], self.test_node, block_3, accepted=True)
# Finally test that a block with no witness transactions can
# omit the commitment.
block_4 = self.build_next_block()
tx3 = CTransaction()
tx3.vin.append(CTxIn(COutPoint(tx2.sha256, 0), b""))
tx3.vout.append(CTxOut(tx.vout[0].nValue - 1000, witness_program))
tx3.rehash()
block_4.vtx.append(tx3)
block_4.hashMerkleRoot = block_4.calc_merkle_root()
block_4.solve()
test_witness_block(self.nodes[0], self.test_node, block_4, with_witness=False, accepted=True)
# Update available utxo's for use in later test.
self.utxo.pop(0)
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
@subtest
def test_block_malleability(self):
# Make sure that a block that has too big a virtual size
# because of a too-large coinbase witness is not permanently
# marked bad.
block = self.build_next_block()
add_witness_commitment(block)
block.solve()
block.vtx[0].wit.vtxinwit[0].scriptWitness.stack.append(b'a' * 5000000)
assert get_virtual_size(block) > MAX_BLOCK_BASE_SIZE
# We can't send over the p2p network, because this is too big to relay
# TODO: repeat this test with a block that can be relayed
self.nodes[0].submitblock(block.serialize().hex())
assert self.nodes[0].getbestblockhash() != block.hash
block.vtx[0].wit.vtxinwit[0].scriptWitness.stack.pop()
assert get_virtual_size(block) < MAX_BLOCK_BASE_SIZE
self.nodes[0].submitblock(block.serialize().hex())
assert self.nodes[0].getbestblockhash() == block.hash
# Now make sure that malleating the witness reserved value doesn't
# result in a block permanently marked bad.
block = self.build_next_block()
add_witness_commitment(block)
block.solve()
# Change the nonce -- should not cause the block to be permanently
# failed
block.vtx[0].wit.vtxinwit[0].scriptWitness.stack = [ser_uint256(1)]
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Changing the witness reserved value doesn't change the block hash
block.vtx[0].wit.vtxinwit[0].scriptWitness.stack = [ser_uint256(0)]
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
@subtest
def test_witness_block_size(self):
# TODO: Test that non-witness carrying blocks can't exceed 1MB
# Skipping this test for now; this is covered in p2p-fullblocktest.py
# Test that witness-bearing blocks are limited at ceil(base + wit/4) <= 1MB.
block = self.build_next_block()
assert len(self.utxo) > 0
# Create a P2WSH transaction.
# The witness program will be a bunch of OP_2DROP's, followed by OP_TRUE.
# This should give us plenty of room to tweak the spending tx's
# virtual size.
NUM_DROPS = 200 # 201 max ops per script!
NUM_OUTPUTS = 50
witness_program = CScript([OP_2DROP] * NUM_DROPS + [OP_TRUE])
witness_hash = uint256_from_str(sha256(witness_program))
script_pubkey = CScript([OP_0, ser_uint256(witness_hash)])
prevout = COutPoint(self.utxo[0].sha256, self.utxo[0].n)
value = self.utxo[0].nValue
parent_tx = CTransaction()
parent_tx.vin.append(CTxIn(prevout, b""))
child_value = int(value / NUM_OUTPUTS)
for i in range(NUM_OUTPUTS):
parent_tx.vout.append(CTxOut(child_value, script_pubkey))
parent_tx.vout[0].nValue -= 50000
assert parent_tx.vout[0].nValue > 0
parent_tx.rehash()
child_tx = CTransaction()
for i in range(NUM_OUTPUTS):
child_tx.vin.append(CTxIn(COutPoint(parent_tx.sha256, i), b""))
child_tx.vout = [CTxOut(value - 100000, CScript([OP_TRUE]))]
for i in range(NUM_OUTPUTS):
child_tx.wit.vtxinwit.append(CTxInWitness())
child_tx.wit.vtxinwit[-1].scriptWitness.stack = [b'a' * 195] * (2 * NUM_DROPS) + [witness_program]
child_tx.rehash()
self.update_witness_block_with_transactions(block, [parent_tx, child_tx])
vsize = get_virtual_size(block)
additional_bytes = (MAX_BLOCK_BASE_SIZE - vsize) * 4
i = 0
while additional_bytes > 0:
# Add some more bytes to each input until we hit MAX_BLOCK_BASE_SIZE+1
extra_bytes = min(additional_bytes + 1, 55)
block.vtx[-1].wit.vtxinwit[int(i / (2 * NUM_DROPS))].scriptWitness.stack[i % (2 * NUM_DROPS)] = b'a' * (195 + extra_bytes)
additional_bytes -= extra_bytes
i += 1
block.vtx[0].vout.pop() # Remove old commitment
add_witness_commitment(block)
block.solve()
vsize = get_virtual_size(block)
assert_equal(vsize, MAX_BLOCK_BASE_SIZE + 1)
# Make sure that our test case would exceed the old max-network-message
# limit
assert len(block.serialize()) > 2 * 1024 * 1024
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now resize the second transaction to make the block fit.
cur_length = len(block.vtx[-1].wit.vtxinwit[0].scriptWitness.stack[0])
block.vtx[-1].wit.vtxinwit[0].scriptWitness.stack[0] = b'a' * (cur_length - 1)
block.vtx[0].vout.pop()
add_witness_commitment(block)
block.solve()
assert get_virtual_size(block) == MAX_BLOCK_BASE_SIZE
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Update available utxo's
self.utxo.pop(0)
self.utxo.append(UTXO(block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue))
@subtest
def test_submit_block(self):
"""Test that submitblock adds the nonce automatically when possible."""
block = self.build_next_block()
# Try using a custom nonce and then don't supply it.
# This shouldn't possibly work.
add_witness_commitment(block, nonce=1)
block.vtx[0].wit = CTxWitness() # drop the nonce
block.solve()
self.nodes[0].submitblock(block.serialize().hex())
assert self.nodes[0].getbestblockhash() != block.hash
# Now redo commitment with the standard nonce, but let bitcoind fill it in.
add_witness_commitment(block, nonce=0)
block.vtx[0].wit = CTxWitness()
block.solve()
self.nodes[0].submitblock(block.serialize().hex())
assert_equal(self.nodes[0].getbestblockhash(), block.hash)
# This time, add a tx with non-empty witness, but don't supply
# the commitment.
block_2 = self.build_next_block()
add_witness_commitment(block_2)
block_2.solve()
# Drop commitment and nonce -- submitblock should not fill in.
block_2.vtx[0].vout.pop()
block_2.vtx[0].wit = CTxWitness()
self.nodes[0].submitblock(block_2.serialize().hex())
# Tip should not advance!
assert self.nodes[0].getbestblockhash() != block_2.hash
@subtest
def test_extra_witness_data(self):
"""Test extra witness data in a transaction."""
block = self.build_next_block()
witness_program = CScript([OP_DROP, OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
# First try extra witness data on a tx that doesn't require a witness
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 2000, script_pubkey))
tx.vout.append(CTxOut(1000, CScript([OP_TRUE]))) # non-witness output
tx.wit.vtxinwit.append(CTxInWitness())
tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([])]
tx.rehash()
self.update_witness_block_with_transactions(block, [tx])
# Extra witness data should not be allowed.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Try extra signature data. Ok if we're not spending a witness output.
block.vtx[1].wit.vtxinwit = []
block.vtx[1].vin[0].scriptSig = CScript([OP_0])
block.vtx[1].rehash()
add_witness_commitment(block)
block.solve()
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Now try extra witness/signature data on an input that DOES require a
# witness
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b"")) # witness output
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 1), b"")) # non-witness
tx2.vout.append(CTxOut(tx.vout[0].nValue, CScript([OP_TRUE])))
tx2.wit.vtxinwit.extend([CTxInWitness(), CTxInWitness()])
tx2.wit.vtxinwit[0].scriptWitness.stack = [CScript([CScriptNum(1)]), CScript([CScriptNum(1)]), witness_program]
tx2.wit.vtxinwit[1].scriptWitness.stack = [CScript([OP_TRUE])]
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx2])
# This has extra witness data, so it should fail.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now get rid of the extra witness, but add extra scriptSig data
tx2.vin[0].scriptSig = CScript([OP_TRUE])
tx2.vin[1].scriptSig = CScript([OP_TRUE])
tx2.wit.vtxinwit[0].scriptWitness.stack.pop(0)
tx2.wit.vtxinwit[1].scriptWitness.stack = []
tx2.rehash()
add_witness_commitment(block)
block.solve()
# This has extra signature data for a witness input, so it should fail.
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now get rid of the extra scriptsig on the witness input, and verify
# success (even with extra scriptsig data in the non-witness input)
tx2.vin[0].scriptSig = b""
tx2.rehash()
add_witness_commitment(block)
block.solve()
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Update utxo for later tests
self.utxo.pop(0)
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
@subtest
def test_max_witness_push_length(self):
"""Test that witness stack can only allow up to 520 byte pushes."""
block = self.build_next_block()
witness_program = CScript([OP_DROP, OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, script_pubkey))
tx.rehash()
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, CScript([OP_TRUE])))
tx2.wit.vtxinwit.append(CTxInWitness())
# First try a 521-byte stack element
tx2.wit.vtxinwit[0].scriptWitness.stack = [b'a' * (MAX_SCRIPT_ELEMENT_SIZE + 1), witness_program]
tx2.rehash()
self.update_witness_block_with_transactions(block, [tx, tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now reduce the length of the stack element
tx2.wit.vtxinwit[0].scriptWitness.stack[0] = b'a' * (MAX_SCRIPT_ELEMENT_SIZE)
add_witness_commitment(block)
block.solve()
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Update the utxo for later tests
self.utxo.pop()
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
@subtest
def test_max_witness_program_length(self):
"""Test that witness outputs greater than 10kB can't be spent."""
MAX_PROGRAM_LENGTH = 10000
# This program is 19 max pushes (9937 bytes), then 64 more opcode-bytes.
long_witness_program = CScript([b'a' * 520] * 19 + [OP_DROP] * 63 + [OP_TRUE])
assert len(long_witness_program) == MAX_PROGRAM_LENGTH + 1
long_witness_hash = sha256(long_witness_program)
long_script_pubkey = CScript([OP_0, long_witness_hash])
block = self.build_next_block()
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, long_script_pubkey))
tx.rehash()
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, CScript([OP_TRUE])))
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [b'a'] * 44 + [long_witness_program]
tx2.rehash()
self.update_witness_block_with_transactions(block, [tx, tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Try again with one less byte in the witness program
witness_program = CScript([b'a' * 520] * 19 + [OP_DROP] * 62 + [OP_TRUE])
assert len(witness_program) == MAX_PROGRAM_LENGTH
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
tx.vout[0] = CTxOut(tx.vout[0].nValue, script_pubkey)
tx.rehash()
tx2.vin[0].prevout.hash = tx.sha256
tx2.wit.vtxinwit[0].scriptWitness.stack = [b'a'] * 43 + [witness_program]
tx2.rehash()
block.vtx = [block.vtx[0]]
self.update_witness_block_with_transactions(block, [tx, tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.utxo.pop()
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
@subtest
def test_witness_input_length(self):
"""Test that vin length must match vtxinwit length."""
witness_program = CScript([OP_DROP, OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
# Create a transaction that splits our utxo into many outputs
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
value = self.utxo[0].nValue
for i in range(10):
tx.vout.append(CTxOut(int(value / 10), script_pubkey))
tx.vout[0].nValue -= 1000
assert tx.vout[0].nValue >= 0
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Try various ways to spend tx that should all break.
# This "broken" transaction serializer will not normalize
# the length of vtxinwit.
class BrokenCTransaction(CTransaction):
def serialize_with_witness(self):
flags = 0
if not self.wit.is_null():
flags |= 1
r = b""
r += struct.pack("<i", self.nVersion)
if flags:
dummy = []
r += ser_vector(dummy)
r += struct.pack("<B", flags)
r += ser_vector(self.vin)
r += ser_vector(self.vout)
if flags & 1:
r += self.wit.serialize()
r += struct.pack("<I", self.nLockTime)
return r
tx2 = BrokenCTransaction()
for i in range(10):
tx2.vin.append(CTxIn(COutPoint(tx.sha256, i), b""))
tx2.vout.append(CTxOut(value - 3000, CScript([OP_TRUE])))
# First try using a too long vtxinwit
for i in range(11):
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[i].scriptWitness.stack = [b'a', witness_program]
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now try using a too short vtxinwit
tx2.wit.vtxinwit.pop()
tx2.wit.vtxinwit.pop()
block.vtx = [block.vtx[0]]
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now make one of the intermediate witnesses be incorrect
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[-1].scriptWitness.stack = [b'a', witness_program]
tx2.wit.vtxinwit[5].scriptWitness.stack = [witness_program]
block.vtx = [block.vtx[0]]
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Fix the broken witness and the block should be accepted.
tx2.wit.vtxinwit[5].scriptWitness.stack = [b'a', witness_program]
block.vtx = [block.vtx[0]]
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.utxo.pop()
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
@subtest
def test_tx_relay_after_segwit_activation(self):
"""Test transaction relay after segwit activation.
After segwit activates, verify that mempool:
- rejects transactions with unnecessary/extra witnesses
- accepts transactions with valid witnesses
and that witness transactions are relayed to non-upgraded peers."""
# Generate a transaction that doesn't require a witness, but send it
# with a witness. Should be rejected because we can't use a witness
# when spending a non-witness output.
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))
tx.wit.vtxinwit.append(CTxInWitness())
tx.wit.vtxinwit[0].scriptWitness.stack = [b'a']
tx.rehash()
tx_hash = tx.sha256
# Verify that unnecessary witnesses are rejected.
self.test_node.announce_tx_and_wait_for_getdata(tx)
assert_equal(len(self.nodes[0].getrawmempool()), 0)
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=True, accepted=False)
# Verify that removing the witness succeeds.
self.test_node.announce_tx_and_wait_for_getdata(tx)
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=False, accepted=True)
# Now try to add extra witness data to a valid witness tx.
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx_hash, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, script_pubkey))
tx2.rehash()
tx3 = CTransaction()
tx3.vin.append(CTxIn(COutPoint(tx2.sha256, 0), b""))
tx3.wit.vtxinwit.append(CTxInWitness())
# Add too-large for IsStandard witness and check that it does not enter reject filter
p2sh_program = CScript([OP_TRUE])
p2sh_pubkey = hash160(p2sh_program)
witness_program2 = CScript([b'a' * 400000])
tx3.vout.append(CTxOut(tx2.vout[0].nValue - 1000, CScript([OP_HASH160, p2sh_pubkey, OP_EQUAL])))
tx3.wit.vtxinwit[0].scriptWitness.stack = [witness_program2]
tx3.rehash()
# Node will not be blinded to the transaction
self.std_node.announce_tx_and_wait_for_getdata(tx3)
test_transaction_acceptance(self.nodes[1], self.std_node, tx3, True, False, 'tx-size')
self.std_node.announce_tx_and_wait_for_getdata(tx3)
test_transaction_acceptance(self.nodes[1], self.std_node, tx3, True, False, 'tx-size')
# Remove witness stuffing, instead add extra witness push on stack
tx3.vout[0] = CTxOut(tx2.vout[0].nValue - 1000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE]))
tx3.wit.vtxinwit[0].scriptWitness.stack = [CScript([CScriptNum(1)]), witness_program]
tx3.rehash()
test_transaction_acceptance(self.nodes[0], self.test_node, tx2, with_witness=True, accepted=True)
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, with_witness=True, accepted=False)
# Get rid of the extra witness, and verify acceptance.
tx3.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
# Also check that old_node gets a tx announcement, even though this is
# a witness transaction.
self.old_node.wait_for_inv([CInv(1, tx2.sha256)]) # wait until tx2 was inv'ed
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, with_witness=True, accepted=True)
self.old_node.wait_for_inv([CInv(1, tx3.sha256)])
# Test that getrawtransaction returns correct witness information
# hash, size, vsize
raw_tx = self.nodes[0].getrawtransaction(tx3.hash, 1)
assert_equal(int(raw_tx["hash"], 16), tx3.calc_sha256(True))
assert_equal(raw_tx["size"], len(tx3.serialize_with_witness()))
weight = len(tx3.serialize_with_witness()) + 3 * len(tx3.serialize_without_witness())
vsize = math.ceil(weight / 4)
assert_equal(raw_tx["vsize"], vsize)
assert_equal(raw_tx["weight"], weight)
assert_equal(len(raw_tx["vin"][0]["txinwitness"]), 1)
assert_equal(raw_tx["vin"][0]["txinwitness"][0], witness_program.hex())
assert vsize != raw_tx["size"]
# Cleanup: mine the transactions and update utxo for next test
self.nodes[0].generate(1)
assert_equal(len(self.nodes[0].getrawmempool()), 0)
self.utxo.pop(0)
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
@subtest
def test_segwit_versions(self):
"""Test validity of future segwit version transactions.
Future segwit versions are non-standard to spend, but valid in blocks.
Sending to future segwit versions is always allowed.
Can run this before and after segwit activation."""
NUM_SEGWIT_VERSIONS = 17 # will test OP_0, OP1, ..., OP_16
if len(self.utxo) < NUM_SEGWIT_VERSIONS:
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
split_value = (self.utxo[0].nValue - 4000) // NUM_SEGWIT_VERSIONS
for i in range(NUM_SEGWIT_VERSIONS):
tx.vout.append(CTxOut(split_value, CScript([OP_TRUE])))
tx.rehash()
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.utxo.pop(0)
for i in range(NUM_SEGWIT_VERSIONS):
self.utxo.append(UTXO(tx.sha256, i, split_value))
self.sync_blocks()
temp_utxo = []
tx = CTransaction()
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
assert_equal(len(self.nodes[1].getrawmempool()), 0)
for version in list(range(OP_1, OP_16 + 1)) + [OP_0]:
# First try to spend to a future version segwit script_pubkey.
script_pubkey = CScript([CScriptOp(version), witness_hash])
tx.vin = [CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b"")]
tx.vout = [CTxOut(self.utxo[0].nValue - 1000, script_pubkey)]
tx.rehash()
test_transaction_acceptance(self.nodes[1], self.std_node, tx, with_witness=True, accepted=False)
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=True, accepted=True)
self.utxo.pop(0)
temp_utxo.append(UTXO(tx.sha256, 0, tx.vout[0].nValue))
self.nodes[0].generate(1) # Mine all the transactions
self.sync_blocks()
assert len(self.nodes[0].getrawmempool()) == 0
# Finally, verify that version 0 -> version 1 transactions
# are standard
script_pubkey = CScript([CScriptOp(OP_1), witness_hash])
tx2 = CTransaction()
tx2.vin = [CTxIn(COutPoint(tx.sha256, 0), b"")]
tx2.vout = [CTxOut(tx.vout[0].nValue - 1000, script_pubkey)]
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
tx2.rehash()
# Gets accepted to both policy-enforcing nodes and others.
test_transaction_acceptance(self.nodes[0], self.test_node, tx2, with_witness=True, accepted=True)
test_transaction_acceptance(self.nodes[1], self.std_node, tx2, with_witness=True, accepted=True)
temp_utxo.pop() # last entry in temp_utxo was the output we just spent
temp_utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
# Spend everything in temp_utxo back to an OP_TRUE output.
tx3 = CTransaction()
total_value = 0
for i in temp_utxo:
tx3.vin.append(CTxIn(COutPoint(i.sha256, i.n), b""))
tx3.wit.vtxinwit.append(CTxInWitness())
total_value += i.nValue
tx3.wit.vtxinwit[-1].scriptWitness.stack = [witness_program]
tx3.vout.append(CTxOut(total_value - 1000, CScript([OP_TRUE])))
tx3.rehash()
# Spending a higher version witness output is not allowed by policy,
# even with fRequireStandard=false.
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, with_witness=True, accepted=False, reason="reserved for soft-fork upgrades")
# Building a block with the transaction must be valid, however.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx2, tx3])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.sync_blocks()
# Add utxo to our list
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
@subtest
def test_premature_coinbase_witness_spend(self):
block = self.build_next_block()
# Change the output of the block to be a witness output.
witness_program = CScript([OP_TRUE])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
block.vtx[0].vout[0].scriptPubKey = script_pubkey
# This next line will rehash the coinbase and update the merkle
# root, and solve.
self.update_witness_block_with_transactions(block, [])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
spend_tx = CTransaction()
spend_tx.vin = [CTxIn(COutPoint(block.vtx[0].sha256, 0), b"")]
spend_tx.vout = [CTxOut(block.vtx[0].vout[0].nValue, witness_program)]
spend_tx.wit.vtxinwit.append(CTxInWitness())
spend_tx.wit.vtxinwit[0].scriptWitness.stack = [witness_program]
spend_tx.rehash()
# Now test a premature spend.
self.nodes[0].generate(98)
self.sync_blocks()
block2 = self.build_next_block()
self.update_witness_block_with_transactions(block2, [spend_tx])
test_witness_block(self.nodes[0], self.test_node, block2, accepted=False)
# Advancing one more block should allow the spend.
self.nodes[0].generate(1)
block2 = self.build_next_block()
self.update_witness_block_with_transactions(block2, [spend_tx])
test_witness_block(self.nodes[0], self.test_node, block2, accepted=True)
self.sync_blocks()
@subtest
def test_uncompressed_pubkey(self):
"""Test uncompressed pubkey validity in segwit transactions.
Uncompressed pubkeys are no longer supported in default relay policy,
but (for now) are still valid in blocks."""
# Segwit transactions using uncompressed pubkeys are not accepted
# under default policy, but should still pass consensus.
key = ECKey()
key.generate(False)
pubkey = key.get_pubkey().get_bytes()
assert_equal(len(pubkey), 65) # This should be an uncompressed pubkey
utxo = self.utxo.pop(0)
# Test 1: P2WPKH
# First create a P2WPKH output that uses an uncompressed pubkey
pubkeyhash = hash160(pubkey)
script_pkh = CScript([OP_0, pubkeyhash])
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(utxo.sha256, utxo.n), b""))
tx.vout.append(CTxOut(utxo.nValue - 1000, script_pkh))
tx.rehash()
# Confirm it in a block.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Now try to spend it. Send it to a P2WSH output, which we'll
# use in the next test.
witness_program = CScript([pubkey, CScriptOp(OP_CHECKSIG)])
witness_hash = sha256(witness_program)
script_wsh = CScript([OP_0, witness_hash])
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, script_wsh))
script = get_p2pkh_script(pubkeyhash)
sig_hash = SegwitV0SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
signature = key.sign_ecdsa(sig_hash) + b'\x01' # 0x1 is SIGHASH_ALL
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [signature, pubkey]
tx2.rehash()
# Should fail policy test.
test_transaction_acceptance(self.nodes[0], self.test_node, tx2, True, False, 'non-mandatory-script-verify-flag (Using non-compressed keys in segwit)')
# But passes consensus.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Test 2: P2WSH
# Try to spend the P2WSH output created in last test.
# Send it to a P2SH(P2WSH) output, which we'll use in the next test.
p2sh_witness_hash = hash160(script_wsh)
script_p2sh = CScript([OP_HASH160, p2sh_witness_hash, OP_EQUAL])
script_sig = CScript([script_wsh])
tx3 = CTransaction()
tx3.vin.append(CTxIn(COutPoint(tx2.sha256, 0), b""))
tx3.vout.append(CTxOut(tx2.vout[0].nValue - 1000, script_p2sh))
tx3.wit.vtxinwit.append(CTxInWitness())
sign_p2pk_witness_input(witness_program, tx3, 0, SIGHASH_ALL, tx2.vout[0].nValue, key)
# Should fail policy test.
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, True, False, 'non-mandatory-script-verify-flag (Using non-compressed keys in segwit)')
# But passes consensus.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx3])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Test 3: P2SH(P2WSH)
# Try to spend the P2SH output created in the last test.
# Send it to a P2PKH output, which we'll use in the next test.
script_pubkey = get_p2pkh_script(pubkeyhash)
tx4 = CTransaction()
tx4.vin.append(CTxIn(COutPoint(tx3.sha256, 0), script_sig))
tx4.vout.append(CTxOut(tx3.vout[0].nValue - 1000, script_pubkey))
tx4.wit.vtxinwit.append(CTxInWitness())
sign_p2pk_witness_input(witness_program, tx4, 0, SIGHASH_ALL, tx3.vout[0].nValue, key)
# Should fail policy test.
test_transaction_acceptance(self.nodes[0], self.test_node, tx4, True, False, 'non-mandatory-script-verify-flag (Using non-compressed keys in segwit)')
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx4])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Test 4: Uncompressed pubkeys should still be valid in non-segwit
# transactions.
tx5 = CTransaction()
tx5.vin.append(CTxIn(COutPoint(tx4.sha256, 0), b""))
tx5.vout.append(CTxOut(tx4.vout[0].nValue - 1000, CScript([OP_TRUE])))
(sig_hash, err) = LegacySignatureHash(script_pubkey, tx5, 0, SIGHASH_ALL)
signature = key.sign_ecdsa(sig_hash) + b'\x01' # 0x1 is SIGHASH_ALL
tx5.vin[0].scriptSig = CScript([signature, pubkey])
tx5.rehash()
# Should pass policy and consensus.
test_transaction_acceptance(self.nodes[0], self.test_node, tx5, True, True)
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx5])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.utxo.append(UTXO(tx5.sha256, 0, tx5.vout[0].nValue))
@subtest
def test_signature_version_1(self):
key = ECKey()
key.generate()
pubkey = key.get_pubkey().get_bytes()
witness_program = CScript([pubkey, CScriptOp(OP_CHECKSIG)])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
# First create a witness output for use in the tests.
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, script_pubkey))
tx.rehash()
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=True, accepted=True)
# Mine this transaction in preparation for following tests.
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
self.sync_blocks()
self.utxo.pop(0)
# Test each hashtype
prev_utxo = UTXO(tx.sha256, 0, tx.vout[0].nValue)
for sigflag in [0, SIGHASH_ANYONECANPAY]:
for hashtype in [SIGHASH_ALL, SIGHASH_NONE, SIGHASH_SINGLE]:
hashtype |= sigflag
block = self.build_next_block()
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(prev_utxo.sha256, prev_utxo.n), b""))
tx.vout.append(CTxOut(prev_utxo.nValue - 1000, script_pubkey))
tx.wit.vtxinwit.append(CTxInWitness())
# Too-large input value
sign_p2pk_witness_input(witness_program, tx, 0, hashtype, prev_utxo.nValue + 1, key)
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Too-small input value
sign_p2pk_witness_input(witness_program, tx, 0, hashtype, prev_utxo.nValue - 1, key)
block.vtx.pop() # remove last tx
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Now try correct value
sign_p2pk_witness_input(witness_program, tx, 0, hashtype, prev_utxo.nValue, key)
block.vtx.pop()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
prev_utxo = UTXO(tx.sha256, 0, tx.vout[0].nValue)
# Test combinations of signature hashes.
# Split the utxo into a lot of outputs.
# Randomly choose up to 10 to spend, sign with different hashtypes, and
# output to a random number of outputs. Repeat NUM_SIGHASH_TESTS times.
# Ensure that we've tested a situation where we use SIGHASH_SINGLE with
# an input index > number of outputs.
NUM_SIGHASH_TESTS = 500
temp_utxos = []
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(prev_utxo.sha256, prev_utxo.n), b""))
split_value = prev_utxo.nValue // NUM_SIGHASH_TESTS
for i in range(NUM_SIGHASH_TESTS):
tx.vout.append(CTxOut(split_value, script_pubkey))
tx.wit.vtxinwit.append(CTxInWitness())
sign_p2pk_witness_input(witness_program, tx, 0, SIGHASH_ALL, prev_utxo.nValue, key)
for i in range(NUM_SIGHASH_TESTS):
temp_utxos.append(UTXO(tx.sha256, i, split_value))
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
block = self.build_next_block()
used_sighash_single_out_of_bounds = False
for i in range(NUM_SIGHASH_TESTS):
# Ping regularly to keep the connection alive
if (not i % 100):
self.test_node.sync_with_ping()
# Choose random number of inputs to use.
num_inputs = random.randint(1, 10)
# Create a slight bias for producing more utxos
num_outputs = random.randint(1, 11)
random.shuffle(temp_utxos)
assert len(temp_utxos) > num_inputs
tx = CTransaction()
total_value = 0
for i in range(num_inputs):
tx.vin.append(CTxIn(COutPoint(temp_utxos[i].sha256, temp_utxos[i].n), b""))
tx.wit.vtxinwit.append(CTxInWitness())
total_value += temp_utxos[i].nValue
split_value = total_value // num_outputs
for i in range(num_outputs):
tx.vout.append(CTxOut(split_value, script_pubkey))
for i in range(num_inputs):
# Now try to sign each input, using a random hashtype.
anyonecanpay = 0
if random.randint(0, 1):
anyonecanpay = SIGHASH_ANYONECANPAY
hashtype = random.randint(1, 3) | anyonecanpay
sign_p2pk_witness_input(witness_program, tx, i, hashtype, temp_utxos[i].nValue, key)
if (hashtype == SIGHASH_SINGLE and i >= num_outputs):
used_sighash_single_out_of_bounds = True
tx.rehash()
for i in range(num_outputs):
temp_utxos.append(UTXO(tx.sha256, i, split_value))
temp_utxos = temp_utxos[num_inputs:]
block.vtx.append(tx)
# Test the block periodically, if we're close to maxblocksize
if (get_virtual_size(block) > MAX_BLOCK_BASE_SIZE - 1000):
self.update_witness_block_with_transactions(block, [])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
block = self.build_next_block()
if (not used_sighash_single_out_of_bounds):
self.log.info("WARNING: this test run didn't attempt SIGHASH_SINGLE with out-of-bounds index value")
# Test the transactions we've added to the block
if (len(block.vtx) > 1):
self.update_witness_block_with_transactions(block, [])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
# Now test witness version 0 P2PKH transactions
pubkeyhash = hash160(pubkey)
script_pkh = CScript([OP_0, pubkeyhash])
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(temp_utxos[0].sha256, temp_utxos[0].n), b""))
tx.vout.append(CTxOut(temp_utxos[0].nValue, script_pkh))
tx.wit.vtxinwit.append(CTxInWitness())
sign_p2pk_witness_input(witness_program, tx, 0, SIGHASH_ALL, temp_utxos[0].nValue, key)
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), b""))
tx2.vout.append(CTxOut(tx.vout[0].nValue, CScript([OP_TRUE])))
script = get_p2pkh_script(pubkeyhash)
sig_hash = SegwitV0SignatureHash(script, tx2, 0, SIGHASH_ALL, tx.vout[0].nValue)
signature = key.sign_ecdsa(sig_hash) + b'\x01' # 0x1 is SIGHASH_ALL
# Check that we can't have a scriptSig
tx2.vin[0].scriptSig = CScript([signature, pubkey])
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx, tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=False)
# Move the signature to the witness.
block.vtx.pop()
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [signature, pubkey]
tx2.vin[0].scriptSig = b""
tx2.rehash()
self.update_witness_block_with_transactions(block, [tx2])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
temp_utxos.pop(0)
# Update self.utxos for later tests by creating two outputs
# that consolidate all the coins in temp_utxos.
output_value = sum(i.nValue for i in temp_utxos) // 2
tx = CTransaction()
index = 0
# Just spend to our usual anyone-can-spend output
tx.vout = [CTxOut(output_value, CScript([OP_TRUE]))] * 2
for i in temp_utxos:
# Use SIGHASH_ALL|SIGHASH_ANYONECANPAY so we can build up
# the signatures as we go.
tx.vin.append(CTxIn(COutPoint(i.sha256, i.n), b""))
tx.wit.vtxinwit.append(CTxInWitness())
sign_p2pk_witness_input(witness_program, tx, index, SIGHASH_ALL | SIGHASH_ANYONECANPAY, i.nValue, key)
index += 1
block = self.build_next_block()
self.update_witness_block_with_transactions(block, [tx])
test_witness_block(self.nodes[0], self.test_node, block, accepted=True)
for i in range(len(tx.vout)):
self.utxo.append(UTXO(tx.sha256, i, tx.vout[i].nValue))
@subtest
def test_non_standard_witness_blinding(self):
"""Test behavior of unnecessary witnesses in transactions does not blind the node for the transaction"""
# Create a p2sh output -- this is so we can pass the standardness
# rules (an anyone-can-spend OP_TRUE would be rejected, if not wrapped
# in P2SH).
p2sh_program = CScript([OP_TRUE])
p2sh_pubkey = hash160(p2sh_program)
script_pubkey = CScript([OP_HASH160, p2sh_pubkey, OP_EQUAL])
# Now check that unnecessary witnesses can't be used to blind a node
# to a transaction, eg by violating standardness checks.
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
tx.vout.append(CTxOut(self.utxo[0].nValue - 1000, script_pubkey))
tx.rehash()
test_transaction_acceptance(self.nodes[0], self.test_node, tx, False, True)
self.nodes[0].generate(1)
self.sync_blocks()
# We'll add an unnecessary witness to this transaction that would cause
# it to be non-standard, to test that violating policy with a witness
# doesn't blind a node to a transaction. Transactions
# rejected for having a witness shouldn't be added
# to the rejection cache.
tx2 = CTransaction()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, 0), CScript([p2sh_program])))
tx2.vout.append(CTxOut(tx.vout[0].nValue - 1000, script_pubkey))
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[0].scriptWitness.stack = [b'a' * 400]
tx2.rehash()
# This will be rejected due to a policy check:
# No witness is allowed, since it is not a witness program but a p2sh program
test_transaction_acceptance(self.nodes[1], self.std_node, tx2, True, False, 'bad-witness-nonstandard')
# If we send without witness, it should be accepted.
test_transaction_acceptance(self.nodes[1], self.std_node, tx2, False, True)
# Now create a new anyone-can-spend utxo for the next test.
tx3 = CTransaction()
tx3.vin.append(CTxIn(COutPoint(tx2.sha256, 0), CScript([p2sh_program])))
tx3.vout.append(CTxOut(tx2.vout[0].nValue - 1000, CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))
tx3.rehash()
test_transaction_acceptance(self.nodes[0], self.test_node, tx2, False, True)
test_transaction_acceptance(self.nodes[0], self.test_node, tx3, False, True)
self.nodes[0].generate(1)
self.sync_blocks()
# Update our utxo list; we spent the first entry.
self.utxo.pop(0)
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
@subtest
def test_non_standard_witness(self):
"""Test detection of non-standard P2WSH witness"""
pad = chr(1).encode('latin-1')
# Create scripts for tests
scripts = []
scripts.append(CScript([OP_DROP] * 100))
scripts.append(CScript([OP_DROP] * 99))
scripts.append(CScript([pad * 59] * 59 + [OP_DROP] * 60))
scripts.append(CScript([pad * 59] * 59 + [OP_DROP] * 61))
p2wsh_scripts = []
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
# For each script, generate a pair of P2WSH and P2SH-P2WSH output.
outputvalue = (self.utxo[0].nValue - 1000) // (len(scripts) * 2)
for i in scripts:
p2wsh = CScript([OP_0, sha256(i)])
p2sh = hash160(p2wsh)
p2wsh_scripts.append(p2wsh)
tx.vout.append(CTxOut(outputvalue, p2wsh))
tx.vout.append(CTxOut(outputvalue, CScript([OP_HASH160, p2sh, OP_EQUAL])))
tx.rehash()
txid = tx.sha256
test_transaction_acceptance(self.nodes[0], self.test_node, tx, with_witness=False, accepted=True)
self.nodes[0].generate(1)
self.sync_blocks()
# Creating transactions for tests
p2wsh_txs = []
p2sh_txs = []
for i in range(len(scripts)):
p2wsh_tx = CTransaction()
p2wsh_tx.vin.append(CTxIn(COutPoint(txid, i * 2)))
p2wsh_tx.vout.append(CTxOut(outputvalue - 5000, CScript([OP_0, hash160(hex_str_to_bytes(""))])))
p2wsh_tx.wit.vtxinwit.append(CTxInWitness())
p2wsh_tx.rehash()
p2wsh_txs.append(p2wsh_tx)
p2sh_tx = CTransaction()
p2sh_tx.vin.append(CTxIn(COutPoint(txid, i * 2 + 1), CScript([p2wsh_scripts[i]])))
p2sh_tx.vout.append(CTxOut(outputvalue - 5000, CScript([OP_0, hash160(hex_str_to_bytes(""))])))
p2sh_tx.wit.vtxinwit.append(CTxInWitness())
p2sh_tx.rehash()
p2sh_txs.append(p2sh_tx)
# Testing native P2WSH
# Witness stack size, excluding witnessScript, over 100 is non-standard
p2wsh_txs[0].wit.vtxinwit[0].scriptWitness.stack = [pad] * 101 + [scripts[0]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2wsh_txs[0], True, False, 'bad-witness-nonstandard')
# Non-standard nodes should accept
test_transaction_acceptance(self.nodes[0], self.test_node, p2wsh_txs[0], True, True)
# Stack element size over 80 bytes is non-standard
p2wsh_txs[1].wit.vtxinwit[0].scriptWitness.stack = [pad * 81] * 100 + [scripts[1]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2wsh_txs[1], True, False, 'bad-witness-nonstandard')
# Non-standard nodes should accept
test_transaction_acceptance(self.nodes[0], self.test_node, p2wsh_txs[1], True, True)
# Standard nodes should accept if element size is not over 80 bytes
p2wsh_txs[1].wit.vtxinwit[0].scriptWitness.stack = [pad * 80] * 100 + [scripts[1]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2wsh_txs[1], True, True)
# witnessScript size at 3600 bytes is standard
p2wsh_txs[2].wit.vtxinwit[0].scriptWitness.stack = [pad, pad, scripts[2]]
test_transaction_acceptance(self.nodes[0], self.test_node, p2wsh_txs[2], True, True)
test_transaction_acceptance(self.nodes[1], self.std_node, p2wsh_txs[2], True, True)
# witnessScript size at 3601 bytes is non-standard
p2wsh_txs[3].wit.vtxinwit[0].scriptWitness.stack = [pad, pad, pad, scripts[3]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2wsh_txs[3], True, False, 'bad-witness-nonstandard')
# Non-standard nodes should accept
test_transaction_acceptance(self.nodes[0], self.test_node, p2wsh_txs[3], True, True)
# Repeating the same tests with P2SH-P2WSH
p2sh_txs[0].wit.vtxinwit[0].scriptWitness.stack = [pad] * 101 + [scripts[0]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2sh_txs[0], True, False, 'bad-witness-nonstandard')
test_transaction_acceptance(self.nodes[0], self.test_node, p2sh_txs[0], True, True)
p2sh_txs[1].wit.vtxinwit[0].scriptWitness.stack = [pad * 81] * 100 + [scripts[1]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2sh_txs[1], True, False, 'bad-witness-nonstandard')
test_transaction_acceptance(self.nodes[0], self.test_node, p2sh_txs[1], True, True)
p2sh_txs[1].wit.vtxinwit[0].scriptWitness.stack = [pad * 80] * 100 + [scripts[1]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2sh_txs[1], True, True)
p2sh_txs[2].wit.vtxinwit[0].scriptWitness.stack = [pad, pad, scripts[2]]
test_transaction_acceptance(self.nodes[0], self.test_node, p2sh_txs[2], True, True)
test_transaction_acceptance(self.nodes[1], self.std_node, p2sh_txs[2], True, True)
p2sh_txs[3].wit.vtxinwit[0].scriptWitness.stack = [pad, pad, pad, scripts[3]]
test_transaction_acceptance(self.nodes[1], self.std_node, p2sh_txs[3], True, False, 'bad-witness-nonstandard')
test_transaction_acceptance(self.nodes[0], self.test_node, p2sh_txs[3], True, True)
self.nodes[0].generate(1) # Mine and clean up the mempool of non-standard node
# Valid but non-standard transactions in a block should be accepted by standard node
self.sync_blocks()
assert_equal(len(self.nodes[0].getrawmempool()), 0)
assert_equal(len(self.nodes[1].getrawmempool()), 0)
self.utxo.pop(0)
@subtest
def test_upgrade_after_activation(self):
"""Test the behavior of starting up a segwit-aware node after the softfork has activated."""
# Restart with the new binary
self.stop_node(2)
self.start_node(2, extra_args=["-segwitheight={}".format(SEGWIT_HEIGHT)])
connect_nodes(self.nodes[0], 2)
self.sync_blocks()
# Make sure that this peer thinks segwit has activated.
assert softfork_active(self.nodes[2], 'segwit')
# Make sure this peer's blocks match those of node0.
height = self.nodes[2].getblockcount()
while height >= 0:
block_hash = self.nodes[2].getblockhash(height)
assert_equal(block_hash, self.nodes[0].getblockhash(height))
assert_equal(self.nodes[0].getblock(block_hash), self.nodes[2].getblock(block_hash))
height -= 1
@subtest
def test_witness_sigops(self):
"""Test sigop counting is correct inside witnesses."""
# Keep this under MAX_OPS_PER_SCRIPT (201)
witness_program = CScript([OP_TRUE, OP_IF, OP_TRUE, OP_ELSE] + [OP_CHECKMULTISIG] * 5 + [OP_CHECKSIG] * 193 + [OP_ENDIF])
witness_hash = sha256(witness_program)
script_pubkey = CScript([OP_0, witness_hash])
sigops_per_script = 20 * 5 + 193 * 1
# We'll produce 2 extra outputs, one with a program that would take us
# over max sig ops, and one with a program that would exactly reach max
# sig ops
outputs = (MAX_SIGOP_COST // sigops_per_script) + 2
extra_sigops_available = MAX_SIGOP_COST % sigops_per_script
# We chose the number of checkmultisigs/checksigs to make this work:
assert extra_sigops_available < 100 # steer clear of MAX_OPS_PER_SCRIPT
# This script, when spent with the first
# N(=MAX_SIGOP_COST//sigops_per_script) outputs of our transaction,
# would push us just over the block sigop limit.
witness_program_toomany = CScript([OP_TRUE, OP_IF, OP_TRUE, OP_ELSE] + [OP_CHECKSIG] * (extra_sigops_available + 1) + [OP_ENDIF])
witness_hash_toomany = sha256(witness_program_toomany)
script_pubkey_toomany = CScript([OP_0, witness_hash_toomany])
# If we spend this script instead, we would exactly reach our sigop
# limit (for witness sigops).
witness_program_justright = CScript([OP_TRUE, OP_IF, OP_TRUE, OP_ELSE] + [OP_CHECKSIG] * (extra_sigops_available) + [OP_ENDIF])
witness_hash_justright = sha256(witness_program_justright)
script_pubkey_justright = CScript([OP_0, witness_hash_justright])
# First split our available utxo into a bunch of outputs
split_value = self.utxo[0].nValue // outputs
tx = CTransaction()
tx.vin.append(CTxIn(COutPoint(self.utxo[0].sha256, self.utxo[0].n), b""))
for i in range(outputs):
tx.vout.append(CTxOut(split_value, script_pubkey))
tx.vout[-2].scriptPubKey = script_pubkey_toomany
tx.vout[-1].scriptPubKey = script_pubkey_justright
tx.rehash()
block_1 = self.build_next_block()
self.update_witness_block_with_transactions(block_1, [tx])
test_witness_block(self.nodes[0], self.test_node, block_1, accepted=True)
tx2 = CTransaction()
# If we try to spend the first n-1 outputs from tx, that should be
# too many sigops.
total_value = 0
for i in range(outputs - 1):
tx2.vin.append(CTxIn(COutPoint(tx.sha256, i), b""))
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[-1].scriptWitness.stack = [witness_program]
total_value += tx.vout[i].nValue
tx2.wit.vtxinwit[-1].scriptWitness.stack = [witness_program_toomany]
tx2.vout.append(CTxOut(total_value, CScript([OP_TRUE])))
tx2.rehash()
block_2 = self.build_next_block()
self.update_witness_block_with_transactions(block_2, [tx2])
test_witness_block(self.nodes[0], self.test_node, block_2, accepted=False)
# Try dropping the last input in tx2, and add an output that has
# too many sigops (contributing to legacy sigop count).
checksig_count = (extra_sigops_available // 4) + 1
script_pubkey_checksigs = CScript([OP_CHECKSIG] * checksig_count)
tx2.vout.append(CTxOut(0, script_pubkey_checksigs))
tx2.vin.pop()
tx2.wit.vtxinwit.pop()
tx2.vout[0].nValue -= tx.vout[-2].nValue
tx2.rehash()
block_3 = self.build_next_block()
self.update_witness_block_with_transactions(block_3, [tx2])
test_witness_block(self.nodes[0], self.test_node, block_3, accepted=False)
# If we drop the last checksig in this output, the tx should succeed.
block_4 = self.build_next_block()
tx2.vout[-1].scriptPubKey = CScript([OP_CHECKSIG] * (checksig_count - 1))
tx2.rehash()
self.update_witness_block_with_transactions(block_4, [tx2])
test_witness_block(self.nodes[0], self.test_node, block_4, accepted=True)
# Reset the tip back down for the next test
self.sync_blocks()
for x in self.nodes:
x.invalidateblock(block_4.hash)
# Try replacing the last input of tx2 to be spending the last
# output of tx
block_5 = self.build_next_block()
tx2.vout.pop()
tx2.vin.append(CTxIn(COutPoint(tx.sha256, outputs - 1), b""))
tx2.wit.vtxinwit.append(CTxInWitness())
tx2.wit.vtxinwit[-1].scriptWitness.stack = [witness_program_justright]
tx2.rehash()
self.update_witness_block_with_transactions(block_5, [tx2])
test_witness_block(self.nodes[0], self.test_node, block_5, accepted=True)
# TODO: test p2sh sigop counting
def test_superfluous_witness(self):
# Serialization of tx that puts witness flag to 3 always
def serialize_with_bogus_witness(tx):
flags = 3
r = b""
r += struct.pack("<i", tx.nVersion)
if flags:
dummy = []
r += ser_vector(dummy)
r += struct.pack("<B", flags)
r += ser_vector(tx.vin)
r += ser_vector(tx.vout)
if flags & 1:
if (len(tx.wit.vtxinwit) != len(tx.vin)):
# vtxinwit must have the same length as vin
tx.wit.vtxinwit = tx.wit.vtxinwit[:len(tx.vin)]
for i in range(len(tx.wit.vtxinwit), len(tx.vin)):
tx.wit.vtxinwit.append(CTxInWitness())
r += tx.wit.serialize()
r += struct.pack("<I", tx.nLockTime)
return r
class msg_bogus_tx(msg_tx):
def serialize(self):
return serialize_with_bogus_witness(self.tx)
self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(address_type='bech32'), 5)
self.nodes[0].generate(1)
unspent = next(u for u in self.nodes[0].listunspent() if u['spendable'] and u['address'].startswith('bcrt'))
raw = self.nodes[0].createrawtransaction([{"txid": unspent['txid'], "vout": unspent['vout']}], {self.nodes[0].getnewaddress(): 1})
tx = FromHex(CTransaction(), raw)
assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].decoderawtransaction, serialize_with_bogus_witness(tx).hex())
with self.nodes[0].assert_debug_log(['Superfluous witness record']):
self.nodes[0].p2p.send_message(msg_bogus_tx(tx))
self.nodes[0].p2p.sync_with_ping()
raw = self.nodes[0].signrawtransactionwithwallet(raw)
assert raw['complete']
raw = raw['hex']
tx = FromHex(CTransaction(), raw)
assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].decoderawtransaction, serialize_with_bogus_witness(tx).hex())
with self.nodes[0].assert_debug_log(['Unknown transaction optional data']):
self.nodes[0].p2p.send_message(msg_bogus_tx(tx))
self.nodes[0].p2p.sync_with_ping()
if __name__ == '__main__':
SegWitTest().main()
Reference in a new issue View git blame Copy permalink