154 lines
6.2 KiB
Python
Executable file
154 lines
6.2 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2015-2019 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test BIP66 (DER SIG).
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Test that the DERSIG soft-fork activates at (regtest) height 1251.
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"""
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from test_framework.blocktools import create_coinbase, create_block, create_transaction
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from test_framework.messages import msg_block
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from test_framework.mininode import mininode_lock, P2PInterface
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from test_framework.script import CScript
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_equal,
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wait_until,
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)
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DERSIG_HEIGHT = 1251
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# Reject codes that we might receive in this test
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REJECT_INVALID = 16
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REJECT_NONSTANDARD = 64
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# A canonical signature consists of:
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# <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>
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def unDERify(tx):
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"""
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Make the signature in vin 0 of a tx non-DER-compliant,
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by adding padding after the S-value.
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"""
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scriptSig = CScript(tx.vin[0].scriptSig)
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newscript = []
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for i in scriptSig:
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if (len(newscript) == 0):
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newscript.append(i[0:-1] + b'\0' + i[-1:])
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else:
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newscript.append(i)
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tx.vin[0].scriptSig = CScript(newscript)
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class BIP66Test(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.extra_args = [['-whitelist=127.0.0.1', '-par=1', '-enablebip61']] # Use only one script thread to get the exact reject reason for testing
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self.setup_clean_chain = True
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self.rpc_timeout = 120
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def test_dersig_info(self, *, is_active):
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assert_equal(self.nodes[0].getblockchaininfo()['softforks']['bip66'],
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{
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"active": is_active,
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"height": DERSIG_HEIGHT,
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"type": "buried",
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},
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)
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def run_test(self):
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self.nodes[0].add_p2p_connection(P2PInterface())
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self.test_dersig_info(is_active=False)
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self.log.info("Mining %d blocks", DERSIG_HEIGHT - 2)
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self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.nodes[0].generate(DERSIG_HEIGHT - 2)]
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self.nodeaddress = self.nodes[0].getnewaddress()
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self.log.info("Test that a transaction with non-DER signature can still appear in a block")
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[0],
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self.nodeaddress, amount=1.0)
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unDERify(spendtx)
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spendtx.rehash()
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tip = self.nodes[0].getbestblockhash()
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block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
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block = create_block(int(tip, 16), create_coinbase(DERSIG_HEIGHT - 1), block_time)
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block.nVersion = 2
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.rehash()
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block.solve()
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self.test_dersig_info(is_active=False) # Not active as of current tip and next block does not need to obey rules
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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self.test_dersig_info(is_active=True) # Not active as of current tip, but next block must obey rules
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assert_equal(self.nodes[0].getbestblockhash(), block.hash)
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self.log.info("Test that blocks must now be at least version 3")
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tip = block.sha256
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block_time += 1
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block = create_block(tip, create_coinbase(DERSIG_HEIGHT), block_time)
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block.nVersion = 2
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block.rehash()
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block.solve()
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with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000002)'.format(block.hash)]):
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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self.nodes[0].p2p.sync_with_ping()
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self.log.info("Test that transactions with non-DER signatures cannot appear in a block")
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block.nVersion = 3
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[1],
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self.nodeaddress, amount=1.0)
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unDERify(spendtx)
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spendtx.rehash()
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# First we show that this tx is valid except for DERSIG by getting it
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# rejected from the mempool for exactly that reason.
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assert_equal(
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[{'txid': spendtx.hash, 'allowed': False, 'reject-reason': '64: non-mandatory-script-verify-flag (Non-canonical DER signature)'}],
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self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0)
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)
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# Now we verify that a block with this transaction is also invalid.
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.rehash()
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block.solve()
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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)]):
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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self.nodes[0].p2p.sync_with_ping()
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wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
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with mininode_lock:
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assert self.nodes[0].p2p.last_message["reject"].code in [REJECT_INVALID, REJECT_NONSTANDARD]
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assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
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assert b'Non-canonical DER signature' in self.nodes[0].p2p.last_message["reject"].reason
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self.log.info("Test that a version 3 block with a DERSIG-compliant transaction is accepted")
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block.vtx[1] = create_transaction(self.nodes[0], self.coinbase_txids[1], self.nodeaddress, amount=1.0)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.rehash()
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block.solve()
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self.test_dersig_info(is_active=True) # Not active as of current tip, but next block must obey rules
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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self.test_dersig_info(is_active=True) # Active as of current tip
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
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if __name__ == '__main__':
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BIP66Test().main()
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