195 lines
6.8 KiB
Python
195 lines
6.8 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2015-2017 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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"""Utilities for manipulating blocks and transactions."""
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from .address import (
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key_to_p2sh_p2wpkh,
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key_to_p2wpkh,
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script_to_p2sh_p2wsh,
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script_to_p2wsh,
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)
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from .messages import (
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CBlock,
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COIN,
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COutPoint,
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CTransaction,
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CTxIn,
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CTxInWitness,
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CTxOut,
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FromHex,
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ToHex,
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bytes_to_hex_str,
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hash256,
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hex_str_to_bytes,
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ser_string,
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ser_uint256,
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sha256,
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uint256_from_str,
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)
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from .script import (
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CScript,
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OP_0,
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OP_1,
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OP_CHECKMULTISIG,
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OP_CHECKSIG,
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OP_RETURN,
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OP_TRUE,
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hash160,
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)
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from .util import assert_equal
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# From BIP141
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WITNESS_COMMITMENT_HEADER = b"\xaa\x21\xa9\xed"
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def create_block(hashprev, coinbase, ntime=None):
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"""Create a block (with regtest difficulty)."""
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block = CBlock()
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if ntime is None:
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import time
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block.nTime = int(time.time() + 600)
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else:
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block.nTime = ntime
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block.hashPrevBlock = hashprev
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block.nBits = 0x207fffff # difficulty retargeting is disabled in REGTEST chainparams
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block.vtx.append(coinbase)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.calc_sha256()
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return block
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def get_witness_script(witness_root, witness_nonce):
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witness_commitment = uint256_from_str(hash256(ser_uint256(witness_root) + ser_uint256(witness_nonce)))
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output_data = WITNESS_COMMITMENT_HEADER + ser_uint256(witness_commitment)
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return CScript([OP_RETURN, output_data])
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def add_witness_commitment(block, nonce=0):
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"""Add a witness commitment to the block's coinbase transaction.
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According to BIP141, blocks with witness rules active must commit to the
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hash of all in-block transactions including witness."""
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# First calculate the merkle root of the block's
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# transactions, with witnesses.
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witness_nonce = nonce
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witness_root = block.calc_witness_merkle_root()
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# witness_nonce should go to coinbase witness.
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block.vtx[0].wit.vtxinwit = [CTxInWitness()]
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block.vtx[0].wit.vtxinwit[0].scriptWitness.stack = [ser_uint256(witness_nonce)]
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# witness commitment is the last OP_RETURN output in coinbase
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block.vtx[0].vout.append(CTxOut(0, get_witness_script(witness_root, witness_nonce)))
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block.vtx[0].rehash()
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block.hashMerkleRoot = block.calc_merkle_root()
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block.rehash()
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def serialize_script_num(value):
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r = bytearray(0)
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if value == 0:
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return r
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neg = value < 0
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absvalue = -value if neg else value
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while (absvalue):
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r.append(int(absvalue & 0xff))
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absvalue >>= 8
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if r[-1] & 0x80:
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r.append(0x80 if neg else 0)
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elif neg:
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r[-1] |= 0x80
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return r
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def create_coinbase(height, pubkey=None):
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"""Create a coinbase transaction, assuming no miner fees.
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If pubkey is passed in, the coinbase output will be a P2PK output;
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otherwise an anyone-can-spend output."""
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coinbase = CTransaction()
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coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff),
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ser_string(serialize_script_num(height)), 0xffffffff))
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coinbaseoutput = CTxOut()
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coinbaseoutput.nValue = 50 * COIN
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halvings = int(height / 150) # regtest
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coinbaseoutput.nValue >>= halvings
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if (pubkey is not None):
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coinbaseoutput.scriptPubKey = CScript([pubkey, OP_CHECKSIG])
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else:
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coinbaseoutput.scriptPubKey = CScript([OP_TRUE])
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coinbase.vout = [coinbaseoutput]
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coinbase.calc_sha256()
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return coinbase
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def create_transaction(prevtx, n, sig, value, script_pub_key=CScript()):
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"""Create a transaction.
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If the script_pub_key is not specified, make it anyone-can-spend."""
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tx = CTransaction()
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assert(n < len(prevtx.vout))
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tx.vin.append(CTxIn(COutPoint(prevtx.sha256, n), sig, 0xffffffff))
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tx.vout.append(CTxOut(value, script_pub_key))
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tx.calc_sha256()
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return tx
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def get_legacy_sigopcount_block(block, accurate=True):
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count = 0
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for tx in block.vtx:
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count += get_legacy_sigopcount_tx(tx, accurate)
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return count
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def get_legacy_sigopcount_tx(tx, accurate=True):
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count = 0
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for i in tx.vout:
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count += i.scriptPubKey.GetSigOpCount(accurate)
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for j in tx.vin:
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# scriptSig might be of type bytes, so convert to CScript for the moment
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count += CScript(j.scriptSig).GetSigOpCount(accurate)
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return count
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def witness_script(use_p2wsh, pubkey):
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"""Create a scriptPubKey for a pay-to-wtiness TxOut.
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This is either a P2WPKH output for the given pubkey, or a P2WSH output of a
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1-of-1 multisig for the given pubkey. Returns the hex encoding of the
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scriptPubKey."""
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if not use_p2wsh:
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# P2WPKH instead
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pubkeyhash = hash160(hex_str_to_bytes(pubkey))
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pkscript = CScript([OP_0, pubkeyhash])
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else:
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# 1-of-1 multisig
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witness_program = CScript([OP_1, hex_str_to_bytes(pubkey), OP_1, OP_CHECKMULTISIG])
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scripthash = sha256(witness_program)
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pkscript = CScript([OP_0, scripthash])
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return bytes_to_hex_str(pkscript)
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def create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount):
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"""Return a transaction (in hex) that spends the given utxo to a segwit output.
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Optionally wrap the segwit output using P2SH."""
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if use_p2wsh:
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program = CScript([OP_1, hex_str_to_bytes(pubkey), OP_1, OP_CHECKMULTISIG])
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addr = script_to_p2sh_p2wsh(program) if encode_p2sh else script_to_p2wsh(program)
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else:
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addr = key_to_p2sh_p2wpkh(pubkey) if encode_p2sh else key_to_p2wpkh(pubkey)
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if not encode_p2sh:
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assert_equal(node.getaddressinfo(addr)['scriptPubKey'], witness_script(use_p2wsh, pubkey))
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return node.createrawtransaction([utxo], {addr: amount})
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def send_to_witness(use_p2wsh, node, utxo, pubkey, encode_p2sh, amount, sign=True, insert_redeem_script=""):
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"""Create a transaction spending a given utxo to a segwit output.
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The output corresponds to the given pubkey: use_p2wsh determines whether to
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use P2WPKH or P2WSH; encode_p2sh determines whether to wrap in P2SH.
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sign=True will have the given node sign the transaction.
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insert_redeem_script will be added to the scriptSig, if given."""
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tx_to_witness = create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount)
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if (sign):
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signed = node.signrawtransactionwithwallet(tx_to_witness)
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assert("errors" not in signed or len(["errors"]) == 0)
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return node.sendrawtransaction(signed["hex"])
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else:
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if (insert_redeem_script):
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tx = FromHex(CTransaction(), tx_to_witness)
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tx.vin[0].scriptSig += CScript([hex_str_to_bytes(insert_redeem_script)])
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tx_to_witness = ToHex(tx)
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return node.sendrawtransaction(tx_to_witness)
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