SomberNight
4 years ago
3 changed files with 3 additions and 171 deletions
@ -1,106 +0,0 @@ |
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# Copyright (C) 2018 The Electrum developers |
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# Distributed under the MIT software license, see the accompanying |
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# file LICENCE or http://www.opensource.org/licenses/mit-license.php |
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import copy |
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from typing import Union |
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from electrum import bitcoin |
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from electrum.bitcoin import push_script, int_to_hex, var_int |
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from electrum.transaction import (Transaction, PartialTransaction, PartialTxInput, |
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multisig_script, construct_witness) |
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from electrum.keystore import BIP32_KeyStore |
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from electrum.wallet import Multisig_Wallet |
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ELECTRUM_PARTIAL_TXN_HEADER_MAGIC = b'EPTF\xff' |
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PARTIAL_FORMAT_VERSION = b'\x00' |
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NO_SIGNATURE = b'\xff' |
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def get_xpubkey(keystore: BIP32_KeyStore, c, i) -> str: |
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def encode_path_int(path_int) -> str: |
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if path_int < 0xffff: |
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hex = bitcoin.int_to_hex(path_int, 2) |
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else: |
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hex = 'ffff' + bitcoin.int_to_hex(path_int, 4) |
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return hex |
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s = ''.join(map(encode_path_int, (c, i))) |
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return 'ff' + bitcoin.DecodeBase58Check(keystore.xpub).hex() + s |
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def serialize_tx_in_legacy_format(tx: PartialTransaction, *, wallet: Multisig_Wallet) -> str: |
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assert isinstance(tx, PartialTransaction) |
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# copy tx so we don't mutate the input arg |
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# monkey-patch method of tx instance to change serialization |
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tx = copy.deepcopy(tx) |
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def get_siglist(txin: 'PartialTxInput', *, estimate_size=False): |
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if txin.is_coinbase_input(): |
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return [], [] |
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if estimate_size: |
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try: |
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pubkey_size = len(txin.pubkeys[0]) |
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except IndexError: |
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pubkey_size = 33 # guess it is compressed |
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num_pubkeys = max(1, len(txin.pubkeys)) |
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pk_list = ["00" * pubkey_size] * num_pubkeys |
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# we assume that signature will be 0x48 bytes long |
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num_sig = max(txin.num_sig, num_pubkeys) |
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sig_list = [ "00" * 0x48 ] * num_sig |
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else: |
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pk_list = ["" for pk in txin.pubkeys] |
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for ks in wallet.get_keystores(): |
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my_pubkey, full_path = ks.find_my_pubkey_in_txinout(txin) |
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x_pubkey = get_xpubkey(ks, full_path[-2], full_path[-1]) |
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pubkey_index = txin.pubkeys.index(my_pubkey) |
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pk_list[pubkey_index] = x_pubkey |
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assert all(pk_list) |
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sig_list = [txin.part_sigs.get(pubkey, NO_SIGNATURE).hex() for pubkey in txin.pubkeys] |
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return pk_list, sig_list |
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def input_script(self, txin: PartialTxInput, *, estimate_size=False) -> str: |
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assert estimate_size is False |
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pubkeys, sig_list = get_siglist(txin, estimate_size=estimate_size) |
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script = ''.join(push_script(x) for x in sig_list) |
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if txin.script_type == 'p2sh': |
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# put op_0 before script |
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script = '00' + script |
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redeem_script = multisig_script(pubkeys, txin.num_sig) |
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script += push_script(redeem_script) |
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return script |
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elif txin.script_type == 'p2wsh': |
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return '' |
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raise Exception(f"unexpected type {txin.script_type}") |
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tx.input_script = input_script.__get__(tx, PartialTransaction) |
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def serialize_witness(self, txin: PartialTxInput, *, estimate_size=False): |
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assert estimate_size is False |
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if txin.witness is not None: |
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return txin.witness.hex() |
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if txin.is_coinbase_input(): |
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return '' |
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assert isinstance(txin, PartialTxInput) |
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if not self.is_segwit_input(txin): |
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return '00' |
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pubkeys, sig_list = get_siglist(txin, estimate_size=estimate_size) |
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if txin.script_type == 'p2wsh': |
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witness_script = multisig_script(pubkeys, txin.num_sig) |
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witness = construct_witness([0] + sig_list + [witness_script]) |
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else: |
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raise Exception(f"unexpected type {txin.script_type}") |
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if txin.is_complete() or estimate_size: |
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partial_format_witness_prefix = '' |
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else: |
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input_value = int_to_hex(txin.value_sats(), 8) |
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witness_version = int_to_hex(0, 2) |
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partial_format_witness_prefix = var_int(0xffffffff) + input_value + witness_version |
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return partial_format_witness_prefix + witness |
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tx.serialize_witness = serialize_witness.__get__(tx, PartialTransaction) |
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buf = ELECTRUM_PARTIAL_TXN_HEADER_MAGIC.hex() |
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buf += PARTIAL_FORMAT_VERSION.hex() |
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buf += tx.serialize_to_network() |
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return buf |
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