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#!/usr/bin/env python3
# Copyright (c) 2015-2019 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 BIP66 (DER SIG).
Test that the DERSIG soft-fork activates at (regtest) height 1251.
"""
from test_framework.blocktools import create_coinbase, create_block, create_transaction
from test_framework.messages import msg_block
from test_framework.mininode import mininode_lock, P2PInterface
from test_framework.script import CScript
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
wait_until,
)
DERSIG_HEIGHT = 1251
# Reject codes that we might receive in this test
REJECT_INVALID = 16
REJECT_NONSTANDARD = 64
# 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)
class BIP66Test(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [['-whitelist=127.0.0.1', '-par=1', '-enablebip61']] # Use only one script thread to get the exact reject reason for testing
self.setup_clean_chain = True
self.rpc_timeout = 120
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def test_dersig_info(self, *, is_active):
assert_equal(
next(s for s in self.nodes[0].getblockchaininfo()['softforks'] if s['id'] == 'bip66'),
{
"id": "bip66",
"version": 3,
"reject": {
"status": is_active
}
},
)
def run_test(self):
self.nodes[0].add_p2p_connection(P2PInterface())
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.nodes[0].generate(DERSIG_HEIGHT - 2)]
self.nodeaddress = self.nodes[0].getnewaddress()
self.log.info("Test that a transaction with non-DER signature can still appear in a block")
spendtx = create_transaction(self.nodes[0], self.coinbase_txids[0],
self.nodeaddress, amount=1.0)
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)
block.nVersion = 2
block.vtx.append(spendtx)
block.hashMerkleRoot = block.calc_merkle_root()
block.rehash()
block.solve()
self.test_dersig_info(is_active=False)
self.nodes[0].p2p.send_and_ping(msg_block(block))
self.test_dersig_info(is_active=False) # 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)
block.nVersion = 2
block.rehash()
block.solve()
with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000002)'.format(block.hash)]):
self.nodes[0].p2p.send_and_ping(msg_block(block))
assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
self.nodes[0].p2p.sync_with_ping()
self.log.info("Test that transactions with non-DER signatures cannot appear in a block")
block.nVersion = 3
spendtx = create_transaction(self.nodes[0], self.coinbase_txids[1],
self.nodeaddress, amount=1.0)
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, 'allowed': False, 'reject-reason': '64: 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.rehash()
block.solve()
with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputs on {} failed with non-mandatory-script-verify-flag (Non-canonical DER signature)'.format(block.vtx[-1].hash)]):
self.nodes[0].p2p.send_and_ping(msg_block(block))
assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
self.nodes[0].p2p.sync_with_ping()
wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
with mininode_lock:
assert self.nodes[0].p2p.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
assert b'Non-canonical DER signature' in self.nodes[0].p2p.last_message["reject"].reason
self.log.info("Test that a version 3 block with a DERSIG-compliant transaction is accepted")
block.vtx[1] = create_transaction(self.nodes[0], self.coinbase_txids[1], self.nodeaddress, amount=1.0)
block.hashMerkleRoot = block.calc_merkle_root()
block.rehash()
block.solve()
self.test_dersig_info(is_active=False) # Not active as of current tip, but next block must obey rules
self.nodes[0].p2p.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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