#!/usr/bin/env python3 import codecs import hashlib import random from test_framework.test_framework import BitcoinTestFramework from test_framework.util import (assert_raises_rpc_error, assert_equal, connect_nodes_bi) from test_framework import ( address, key, ) # Generate wallet import format from private key. def wif(pk): # Base58Check version for regtest WIF keys is 0xef = 239 return address.byte_to_base58(pk, 239) # The signblockscript is a Bitcoin Script k-of-n multisig script. def make_signblockscript(num_nodes, required_signers, keys): assert(num_nodes >= required_signers) script = "{}".format(50 + required_signers) for i in range(num_nodes): k = keys[i] script += "41" script += codecs.encode(k.get_pubkey(), 'hex_codec').decode("utf-8") script += "{}".format(50 + num_nodes) # num keys script += "ae" # OP_CHECKMULTISIG print('signblockscript', script) return script class BlockSignTest(BitcoinTestFramework): """ Test signed-blockchain-related RPC calls and functionality: - getnewblockhex - signblock - combineblocksigs - submitblock - testproposedblock - getcompactsketch - consumecompactsketch - consumegetblocktxn - finalizecompactblock As well as syncing blocks over p2p """ # Dynamically generate N keys to be used for block signing. def init_keys(self, num_keys): self.keys = [] self.wifs = [] for i in range(num_keys): k = key.CECKey() pk_bytes = hashlib.sha256(str(random.getrandbits(256)).encode('utf-8')).digest() k.set_secretbytes(pk_bytes) w = wif(pk_bytes) print("generated key {}: \n pub: {}\n wif: {}".format(i+1, codecs.encode(k.get_pubkey(), 'hex_codec').decode("utf-8"), w)) self.keys.append(k) self.wifs.append(wif(pk_bytes)) def set_test_params(self): self.num_nodes = 5 self.num_keys = 4 self.required_signers = 3 self.setup_clean_chain = True self.init_keys(self.num_nodes-1) # Last node cannot sign and is connected to all via p2p signblockscript = make_signblockscript(self.num_keys, self.required_signers, self.keys) self.extra_args = [[ "-signblockscript={}".format(signblockscript), "-con_max_block_sig_size={}".format(self.required_signers*74), "-anyonecanspendaremine=1" ]] * self.num_nodes def setup_network(self): self.setup_nodes() # Connect non-signing node to a single signing one (to not pass blocks between signers) connect_nodes_bi(self.nodes, 0, self.num_nodes-1) def check_height(self, expected_height): for n in self.nodes: assert_equal(n.getblockcount(), expected_height) def mine_block(self, make_transactions): # mine block in round robin sense: depending on the block number, a node # is selected to create the block, others sign it and the selected node # broadcasts it mineridx = self.nodes[0].getblockcount() % self.num_nodes # assuming in sync mineridx_next = (self.nodes[0].getblockcount() + 1) % self.num_nodes miner = self.nodes[mineridx] miner_next = self.nodes[mineridx_next] blockcount = miner.getblockcount() # Make a few transactions to make non-empty blocks for compact transmission if make_transactions: for i in range(5): miner.sendtoaddress(miner_next.getnewaddress(), int(miner.getbalance()/10), "", "", True) # miner makes a block block = miner.getnewblockhex() # other signing nodes get fed compact blocks for i in range(self.num_keys): if i == mineridx: continue sketch = miner.getcompactsketch(block) compact_response = self.nodes[i].consumecompactsketch(sketch) if make_transactions: block_txn = self.nodes[i].consumegetblocktxn(block, compact_response["block_tx_req"]) final_block = self.nodes[i].finalizecompactblock(sketch, block_txn, compact_response["found_transactions"]) else: # If there's only coinbase, it should succeed immediately final_block = compact_response["blockhex"] # Block should be complete, sans signatures self.nodes[i].testproposedblock(final_block) # non-signing node can not sign assert_raises_rpc_error(-25, "Could not sign the block.", self.nodes[-1].signblock, block) # collect num_keys signatures from signers, reduce to required_signers sigs during combine sigs = [] for i in range(self.num_keys): result = miner.combineblocksigs(block, sigs) sigs = sigs + self.nodes[i].signblock(block) assert_equal(result["complete"], i >= self.required_signers) # submitting should have no effect pre-threshhold if i < self.required_signers: miner.submitblock(result["hex"]) self.check_height(blockcount) result = miner.combineblocksigs(block, sigs) assert_equal(result["complete"], True) # All signing nodes must submit... we're not connected! self.nodes[0].submitblock(result["hex"]) early_proposal = self.nodes[0].getnewblockhex() # testproposedblock should reject # Submit blocks to all other signing nodes next, as well as too-early block proposal for i in range(1, self.num_keys): assert_raises_rpc_error(-25, "proposal was not based on our best chain", self.nodes[i].testproposedblock, early_proposal) self.nodes[i].submitblock(result["hex"]) # All nodes should be synced in blocks and transactions(mempool should be empty) self.sync_all() def mine_blocks(self, num_blocks, transactions): for i in range(num_blocks): self.mine_block(transactions) def run_test(self): # Have every node except last import its block signing private key. for i in range(self.num_keys): self.nodes[i].importprivkey(self.wifs[i]) self.check_height(0) # mine a block with no transactions print("Mining and signing 101 blocks to unlock funds") self.mine_blocks(101, False) # mine blocks with transactions print("Mining and signing non-empty blocks") self.mine_blocks(10, True) # Height check also makes sure non-signing, p2p connected node gets block self.check_height(111) # signblock rpc field stuff tip = self.nodes[0].getblockhash(self.nodes[0].getblockcount()) header = self.nodes[0].getblockheader(tip) block = self.nodes[0].getblock(tip) info = self.nodes[0].getblockchaininfo() assert('signblock_witness_asm' in header) assert('signblock_witness_hex' in header) assert('signblock_witness_asm' in block) assert('signblock_witness_hex' in block) signblockscript = make_signblockscript(self.num_keys, self.required_signers, self.keys) assert_equal(info['signblock_asm'], self.nodes[0].decodescript(signblockscript)['asm']) assert_equal(info['signblock_hex'], signblockscript) if __name__ == '__main__': BlockSignTest().main()