#!/usr/bin/env python3 # Copyright (c) 2015-2020 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 ( DERSIG_HEIGHT, 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> <02> <02> 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=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(from_node=self.nodes[0], utxo_to_spend=utxo_to_spend)['tx'] def test_dersig_info(self, *, is_active): assert_equal(self.nodes[0].getblockchaininfo()['softforks']['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) block.nVersion = 2 block.vtx.append(spendtx) block.hashMerkleRoot = block.calc_merkle_root() block.rehash() 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) block.nVersion = 2 block.rehash() 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 = 3 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.rehash() 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 version 3 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.rehash() 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()