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#!/usr/bin/env python3
# Copyright (c) 2015-2021 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 BIP66 (DER SIG).
Test the DERSIG soft-fork activation on regtest.
"""
from test_framework.blocktools import (
create_block,
create_coinbase,
)
from test_framework.messages import msg_block
from test_framework.p2p import P2PInterface
from test_framework.script import CScript
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
)
from test_framework.wallet import (
MiniWallet,
MiniWalletMode,
)
# A canonical signature consists of:
# <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>
def unDERify(tx):
"""
Make the signature in vin 0 of a tx non-DER-compliant,
by adding padding after the S-value.
"""
scriptSig = CScript(tx.vin[0].scriptSig)
newscript = []
for i in scriptSig:
if (len(newscript) == 0):
newscript.append(i[0:-1] + b'\0' + i[-1:])
else:
newscript.append(i)
tx.vin[0].scriptSig = CScript(newscript)
DERSIG_HEIGHT = 102
class BIP66Test(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [[
f'-testactivationheight=dersig@{DERSIG_HEIGHT}',
'-whitelist=noban@127.0.0.1',
'-par=1', # Use only one script thread to get the exact log msg for testing
]]
self.setup_clean_chain = True
self.rpc_timeout = 240
def create_tx(self, input_txid):
utxo_to_spend = self.miniwallet.get_utxo(txid=input_txid, mark_as_spent=False)
return self.miniwallet.create_self_transfer(utxo_to_spend=utxo_to_spend)['tx']
def test_dersig_info(self, *, is_active):
assert_equal(self.nodes[0].getdeploymentinfo()['deployments']['bip66'],
{
"active": is_active,
"height": DERSIG_HEIGHT,
"type": "buried",
},
)
def run_test(self):
peer = self.nodes[0].add_p2p_connection(P2PInterface())
self.miniwallet = MiniWallet(self.nodes[0], mode=MiniWalletMode.RAW_P2PK)
self.test_dersig_info(is_active=False)
self.log.info("Mining %d blocks", DERSIG_HEIGHT - 2)
self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.generate(self.miniwallet, DERSIG_HEIGHT - 2)]
self.log.info("Test that a transaction with non-DER signature can still appear in a block")
spendtx = self.create_tx(self.coinbase_txids[0])
unDERify(spendtx)
spendtx.rehash()
tip = self.nodes[0].getbestblockhash()
block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
block = create_block(int(tip, 16), create_coinbase(DERSIG_HEIGHT - 1), block_time, txlist=[spendtx])
block.solve()
assert_equal(self.nodes[0].getblockcount(), DERSIG_HEIGHT - 2)
self.test_dersig_info(is_active=False) # Not active as of current tip and next block does not need to obey rules
peer.send_and_ping(msg_block(block))
assert_equal(self.nodes[0].getblockcount(), DERSIG_HEIGHT - 1)
self.test_dersig_info(is_active=True) # Not active as of current tip, but next block must obey rules
assert_equal(self.nodes[0].getbestblockhash(), block.hash)
self.log.info("Test that blocks must now be at least version 3")
tip = block.sha256
block_time += 1
block = create_block(tip, create_coinbase(DERSIG_HEIGHT), block_time, version=2)
block.solve()
with self.nodes[0].assert_debug_log(expected_msgs=[f'{block.hash}, bad-version(0x00000002)']):
peer.send_and_ping(msg_block(block))
assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
peer.sync_with_ping()
self.log.info("Test that transactions with non-DER signatures cannot appear in a block")
block.nVersion = 4
spendtx = self.create_tx(self.coinbase_txids[1])
unDERify(spendtx)
spendtx.rehash()
# First we show that this tx is valid except for DERSIG by getting it
# rejected from the mempool for exactly that reason.
assert_equal(
[{
'txid': spendtx.hash,
'wtxid': spendtx.getwtxid(),
'allowed': False,
'reject-reason': 'non-mandatory-script-verify-flag (Non-canonical DER signature)',
}],
self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0),
)
# Now we verify that a block with this transaction is also invalid.
block.vtx.append(spendtx)
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
with self.nodes[0].assert_debug_log(expected_msgs=[f'CheckInputScripts on {block.vtx[-1].hash} failed with non-mandatory-script-verify-flag (Non-canonical DER signature)']):
peer.send_and_ping(msg_block(block))
assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
peer.sync_with_ping()
self.log.info("Test that a block with a DERSIG-compliant transaction is accepted")
block.vtx[1] = self.create_tx(self.coinbase_txids[1])
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
self.test_dersig_info(is_active=True) # Not active as of current tip, but next block must obey rules
peer.send_and_ping(msg_block(block))
self.test_dersig_info(is_active=True) # Active as of current tip
assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
if __name__ == '__main__':
BIP66Test().main()
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