Differential D3557 Diff 10077 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) 2015-2016 The Bitcoin Core developers		# Copyright (c) 2015-2016 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.
"""		"""

from .bignum import bn2vch		from .bignum import bn2vch
from binascii import hexlify		from binascii import hexlify
import hashlib		import hashlib
import struct		import struct
import sys

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,
)		)

bchr = chr
bord = ord
if sys.version > '3':
long = int

def bchr(x): return bytes([x])

def bord(x): return x


MAX_SCRIPT_ELEMENT_SIZE = 520		MAX_SCRIPT_ELEMENT_SIZE = 520

OPCODE_NAMES = {}		OPCODE_NAMES = {}


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


_opcode_instances = []		_opcode_instances = []


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):
"""Encode a PUSHDATA op, returning bytes"""		"""Encode a PUSHDATA op, returning bytes"""
if len(d) < 0x4c:		if len(d) < 0x4c:
return b'' + bchr(len(d)) + d # OP_PUSHDATA		# OP_PUSHDATA
		return b'' + bytes([len(d)]) + d
elif len(d) <= 0xff:		elif len(d) <= 0xff:
return b'\x4c' + bchr(len(d)) + d # OP_PUSHDATA1		# OP_PUSHDATA1
		return b'\x4c' + bytes([len(d)]) + d
elif len(d) <= 0xffff:		elif len(d) <= 0xffff:
return b'\x4d' + struct.pack(b'<H', len(d)) + d # OP_PUSHDATA2		return b'\x4d' + struct.pack(b'<H', len(d)) + d # OP_PUSHDATA2
elif len(d) <= 0xffffffff:		elif len(d) <= 0xffffffff:
return b'\x4e' + struct.pack(b'<I', len(d)) + d # OP_PUSHDATA4		return b'\x4e' + struct.pack(b'<I', len(d)) + d # OP_PUSHDATA4
else:		else:
raise ValueError("Data too long to encode in a PUSHDATA op")		raise ValueError("Data too long to encode in a PUSHDATA op")

@staticmethod		@staticmethod
▲ Show 20 Lines • Show All 347 Lines • ▼ Show 20 Lines	def encode(obj):
absvalue = -obj.value if neg else obj.value		absvalue = -obj.value if neg else obj.value
while (absvalue):		while (absvalue):
r.append(absvalue & 0xff)		r.append(absvalue & 0xff)
absvalue >>= 8		absvalue >>= 8
if r[-1] & 0x80:		if r[-1] & 0x80:
r.append(0x80 if neg else 0)		r.append(0x80 if neg else 0)
elif neg:		elif neg:
r[-1] \|= 0x80		r[-1] \|= 0x80
return bytes(bchr(len(r)) + r)		return bytes(bytes([len(r)]) + r)


class CScript(bytes):		class CScript(bytes):
"""Serialized script		"""Serialized script

A bytes subclass, so you can use this directly whenever bytes are accepted.		A bytes subclass, so you can use this directly whenever bytes are accepted.
Note that this means that indexing does not work - you'll get an index by		Note that this means that indexing does not work - you'll get an index by
byte rather than opcode. This format was chosen for efficiency so that the		byte rather than opcode. This format was chosen for efficiency so that the
general case would not require creating a lot of little CScriptOP objects.		general case would not require creating a lot of little CScriptOP objects.

iter(script) however does iterate by opcode.		iter(script) however does iterate by opcode.
"""		"""
__slots__ = ()		__slots__ = ()

@classmethod		@classmethod
def __coerce_instance(cls, other):		def __coerce_instance(cls, other):
# Coerce other into bytes		# Coerce other into bytes
if isinstance(other, CScriptOp):		if isinstance(other, CScriptOp):
other = bchr(other)		other = bytes([other])
elif isinstance(other, CScriptNum):		elif isinstance(other, CScriptNum):
if (other.value == 0):		if (other.value == 0):
other = bchr(CScriptOp(OP_0))		other = bytes([CScriptOp(OP_0)])
else:		else:
other = CScriptNum.encode(other)		other = CScriptNum.encode(other)
elif isinstance(other, int):		elif isinstance(other, int):
if 0 <= other <= 16:		if 0 <= other <= 16:
other = bytes(bchr(CScriptOp.encode_op_n(other)))		other = bytes([CScriptOp.encode_op_n(other)])
elif other == -1:		elif other == -1:
other = bytes(bchr(OP_1NEGATE))		other = bytes([OP_1NEGATE])
else:		else:
other = CScriptOp.encode_op_pushdata(bn2vch(other))		other = CScriptOp.encode_op_pushdata(bn2vch(other))
elif isinstance(other, (bytes, bytearray)):		elif isinstance(other, (bytes, bytearray)):
other = CScriptOp.encode_op_pushdata(other)		other = CScriptOp.encode_op_pushdata(other)
return other		return other

def __add__(self, other):		def __add__(self, other):
# Do the coercion outside of the try block so that errors in it are		# Do the coercion outside of the try block so that errors in it are
Show All 27 Lines	def raw_iter(self):

Yields tuples of (opcode, data, sop_idx) so that the different possible		Yields tuples of (opcode, data, sop_idx) so that the different possible
PUSHDATA encodings can be accurately distinguished, as well as		PUSHDATA encodings can be accurately distinguished, as well as
determining the exact opcode byte indexes. (sop_idx)		determining the exact opcode byte indexes. (sop_idx)
"""		"""
i = 0		i = 0
while i < len(self):		while i < len(self):
sop_idx = i		sop_idx = i
opcode = bord(self[i])		opcode = self[i]
i += 1		i += 1

if opcode > OP_PUSHDATA4:		if opcode > OP_PUSHDATA4:
yield (opcode, None, sop_idx)		yield (opcode, None, sop_idx)
else:		else:
datasize = None		datasize = None
pushdata_type = None		pushdata_type = None
if opcode < OP_PUSHDATA1:		if opcode < OP_PUSHDATA1:
pushdata_type = 'PUSHDATA({})'.format(opcode)		pushdata_type = 'PUSHDATA({})'.format(opcode)
datasize = opcode		datasize = opcode

elif opcode == OP_PUSHDATA1:		elif opcode == OP_PUSHDATA1:
pushdata_type = 'PUSHDATA1'		pushdata_type = 'PUSHDATA1'
if i >= len(self):		if i >= len(self):
raise CScriptInvalidError(		raise CScriptInvalidError(
'PUSHDATA1: missing data length')		'PUSHDATA1: missing data length')
datasize = bord(self[i])		datasize = self[i]
i += 1		i += 1

elif opcode == OP_PUSHDATA2:		elif opcode == OP_PUSHDATA2:
pushdata_type = 'PUSHDATA2'		pushdata_type = 'PUSHDATA2'
if i + 1 >= len(self):		if i + 1 >= len(self):
raise CScriptInvalidError(		raise CScriptInvalidError(
'PUSHDATA2: missing data length')		'PUSHDATA2: missing data length')
datasize = bord(self[i]) + (bord(self[i + 1]) << 8)		datasize = self[i] + (self[i + 1] << 8)
i += 2		i += 2

elif opcode == OP_PUSHDATA4:		elif opcode == OP_PUSHDATA4:
pushdata_type = 'PUSHDATA4'		pushdata_type = 'PUSHDATA4'
if i + 3 >= len(self):		if i + 3 >= len(self):
raise CScriptInvalidError(		raise CScriptInvalidError(
'PUSHDATA4: missing data length')		'PUSHDATA4: missing data length')
datasize = bord(self[i]) + (bord(self[i + 1]) << 8) + \		datasize = self[i] + (self[i + 1] << 8) + \
(bord(self[i + 2]) << 16) + (bord(self[i + 3]) << 24)		(self[i + 2] << 16) + (self[i + 3] << 24)
i += 4		i += 4

else:		else:
assert False # shouldn't happen		assert False # shouldn't happen

data = bytes(self[i:i + datasize])		data = bytes(self[i:i + datasize])

# Check for truncation		# Check for truncation
▲ Show 20 Lines • Show All 196 Lines • Show Last 20 Lines