#!/usr/bin/env python3 # Copyright (c) 2015-2016 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. from test_framework.test_framework import ComparisonTestFramework from test_framework.util import * from test_framework.mininode import CTransaction, NetworkThread from test_framework.blocktools import create_coinbase, create_block from test_framework.comptool import TestInstance, TestManager from test_framework.script import CScript from io import BytesIO import time # 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) ''' This test is meant to exercise BIP66 (DER SIG). Connect to a single node. Mine 2 (version 2) blocks (save the coinbases for later). Generate 98 more version 2 blocks, verify the node accepts. Mine 749 version 3 blocks, verify the node accepts. Check that the new DERSIG rules are not enforced on the 750th version 3 block. Check that the new DERSIG rules are enforced on the 751st version 3 block. Mine 199 new version blocks. Mine 1 old-version block. Mine 1 new version block. Mine 1 old version block, see that the node rejects. ''' class BIP66Test(ComparisonTestFramework): def __init__(self): super().__init__() self.num_nodes = 1 def setup_network(self): # Must set the blockversion for this test self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args=[['-debug', '-whitelist=127.0.0.1', '-blockversion=2']], binary=[self.options.testbinary]) def run_test(self): test = TestManager(self, self.options.tmpdir) test.add_all_connections(self.nodes) NetworkThread().start() # Start up network handling in another thread test.run() def create_transaction(self, node, coinbase, to_address, amount): from_txid = node.getblock(coinbase)['tx'][0] inputs = [{ "txid" : from_txid, "vout" : 0}] outputs = { to_address : amount } rawtx = node.createrawtransaction(inputs, outputs) signresult = node.signrawtransaction(rawtx) tx = CTransaction() f = BytesIO(hex_str_to_bytes(signresult['hex'])) tx.deserialize(f) return tx def get_tests(self): self.coinbase_blocks = self.nodes[0].generate(2) height = 3 # height of the next block to build self.tip = int("0x" + self.nodes[0].getbestblockhash(), 0) self.nodeaddress = self.nodes[0].getnewaddress() self.last_block_time = int(time.time()) ''' 298 more version 2 blocks ''' test_blocks = [] for i in range(298): block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 2 block.rehash() block.solve() test_blocks.append([block, True]) self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance(test_blocks, sync_every_block=False) ''' Mine 749 version 3 blocks ''' test_blocks = [] for i in range(749): block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 3 block.rehash() block.solve() test_blocks.append([block, True]) self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance(test_blocks, sync_every_block=False) ''' Check that the new DERSIG rules are not enforced in the 750th version 3 block. ''' spendtx = self.create_transaction(self.nodes[0], self.coinbase_blocks[0], self.nodeaddress, 1.0) unDERify(spendtx) spendtx.rehash() block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 3 block.vtx.append(spendtx) block.hashMerkleRoot = block.calc_merkle_root() block.rehash() block.solve() self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance([[block, True]]) ''' Mine 199 new version blocks on last valid tip ''' test_blocks = [] for i in range(199): block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 3 block.rehash() block.solve() test_blocks.append([block, True]) self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance(test_blocks, sync_every_block=False) ''' Mine 1 old version block ''' block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 2 block.rehash() block.solve() self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance([[block, True]]) ''' Mine 1 new version block ''' block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 3 block.rehash() block.solve() self.last_block_time += 1 self.tip = block.sha256 height += 1 yield TestInstance([[block, True]]) ''' Check that the new DERSIG rules are enforced in the 951st version 3 block. ''' spendtx = self.create_transaction(self.nodes[0], self.coinbase_blocks[1], self.nodeaddress, 1.0) unDERify(spendtx) spendtx.rehash() block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 3 block.vtx.append(spendtx) block.hashMerkleRoot = block.calc_merkle_root() block.rehash() block.solve() self.last_block_time += 1 yield TestInstance([[block, False]]) ''' Mine 1 old version block, should be invalid ''' block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1) block.nVersion = 2 block.rehash() block.solve() self.last_block_time += 1 yield TestInstance([[block, False]]) if __name__ == '__main__': BIP66Test().main()