Differential D9273 Diff 27824 test/functional/test_framework/script.py

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test/functional/test_framework/script.py

	#!/usr/bin/env python3			#!/usr/bin/env python3
	# Copyright (c) 2015-2019 The Bitcoin Core developers			# Copyright (c) 2015-2019 The Bitcoin Core developers
	# Distributed under the MIT software license, see the accompanying			# Distributed under the MIT software license, see the accompanying
	# file COPYING or http://www.opensource.org/licenses/mit-license.php.			# file COPYING or http://www.opensource.org/licenses/mit-license.php.
	"""Functionality to build scripts, as well as SignatureHash().			"""Functionality to build scripts, as well as SignatureHash().

	This file is modified from python-bitcoinlib.			This file is modified from python-bitcoinlib.
	"""			"""

	import hashlib			import hashlib
	import struct			import struct
	import unittest			import unittest
				from typing import List, Dict

	from .messages import (			from .messages import (
	CTransaction,			CTransaction,
	CTxOut,			CTxOut,
	hash256,			hash256,
	ser_string,			ser_string,
	ser_uint256,			ser_uint256,
	sha256,			sha256,
	uint256_from_str,			uint256_from_str,
	)			)


	MAX_SCRIPT_ELEMENT_SIZE = 520			MAX_SCRIPT_ELEMENT_SIZE = 520
	OPCODE_NAMES = {}			OPCODE_NAMES: Dict["CScriptOp", str] = {}


	def hash160(s):			def hash160(s):
	return hashlib.new('ripemd160', sha256(s)).digest()			return hashlib.new('ripemd160', sha256(s)).digest()


	def bn2vch(v):			def bn2vch(v):
	"""Convert number to bitcoin-specific little endian format."""			"""Convert number to bitcoin-specific little endian format."""
	# We need v.bit_length() bits, plus a sign bit for every nonzero number.			# We need v.bit_length() bits, plus a sign bit for every nonzero number.
	n_bits = v.bit_length() + (v != 0)			n_bits = v.bit_length() + (v != 0)
	# The number of bytes for that is:			# The number of bytes for that is:
	n_bytes = (n_bits + 7) // 8			n_bytes = (n_bits + 7) // 8
	# Convert number to absolute value + sign in top bit.			# Convert number to absolute value + sign in top bit.
	encoded_v = 0 if v == 0 else abs(v) \| ((v < 0) << (n_bytes * 8 - 1))			encoded_v = 0 if v == 0 else abs(v) \| ((v < 0) << (n_bytes * 8 - 1))
	# Serialize to bytes			# Serialize to bytes
	return encoded_v.to_bytes(n_bytes, 'little')			return encoded_v.to_bytes(n_bytes, 'little')


	_opcode_instances = []			_opcode_instances: List["CScriptOp"] = []


	class CScriptOp(int):			class CScriptOp(int):
	"""A single script opcode"""			"""A single script opcode"""
	__slots__ = ()			__slots__ = ()

	@staticmethod			@staticmethod
	def encode_op_pushdata(d):			def encode_op_pushdata(d):
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