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script.py
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#!/usr/bin/env python3
# Copyright (c) 2015-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Functionality to build scripts, as well as signature hash functions.
This file is modified from python-bitcoinlib.
"""
from collections import namedtuple
import struct
import unittest
from typing import List, Dict
from .key import TaggedHash, tweak_add_pubkey
from .messages import (
CTransaction,
CTxOut,
CTxOutAsset,
CTxOutValue,
hash256,
ser_compact_size,
ser_string,
ser_uint256,
ser_vector,
sha256,
uint256_from_str,
)
from .ripemd160 import ripemd160
MAX_SCRIPT_ELEMENT_SIZE = 520
LOCKTIME_THRESHOLD = 500000000
ANNEX_TAG = 0x50
LEAF_VERSION_TAPSCRIPT = 0xc4
LEAF_VERSION_TAPSIMPLICITY = 0xbe
def hash160(s):
return ripemd160(sha256(s))
def bn2vch(v):
"""Convert number to bitcoin-specific little endian format."""
# We need v.bit_length() bits, plus a sign bit for every nonzero number.
n_bits = v.bit_length() + (v != 0)
# The number of bytes for that is:
n_bytes = (n_bits + 7) // 8
# Convert number to absolute value + sign in top bit.
encoded_v = 0 if v == 0 else abs(v) | ((v < 0) << (n_bytes * 8 - 1))
# Serialize to bytes
return encoded_v.to_bytes(n_bytes, 'little')
class CScriptOp(int):
"""A single script opcode"""
__slots__ = ()
@staticmethod
def encode_op_pushdata(d):
"""Encode a PUSHDATA op, returning bytes"""
if len(d) < 0x4c:
return b'' + bytes([len(d)]) + d # OP_PUSHDATA
elif len(d) <= 0xff:
return b'\x4c' + bytes([len(d)]) + d # OP_PUSHDATA1
elif len(d) <= 0xffff:
return b'\x4d' + struct.pack(b'<H', len(d)) + d # OP_PUSHDATA2
elif len(d) <= 0xffffffff:
return b'\x4e' + struct.pack(b'<I', len(d)) + d # OP_PUSHDATA4
else:
raise ValueError("Data too long to encode in a PUSHDATA op")
@staticmethod
def encode_op_n(n):
"""Encode a small integer op, returning an opcode"""
if not (0 <= n <= 16):
raise ValueError('Integer must be in range 0 <= n <= 16, got %d' % n)
if n == 0:
return OP_0
else:
return CScriptOp(OP_1 + n - 1)
def decode_op_n(self):
"""Decode a small integer opcode, returning an integer"""
if self == OP_0:
return 0
if not (self == OP_0 or OP_1 <= self <= OP_16):
raise ValueError('op %r is not an OP_N' % self)
return int(self - OP_1 + 1)
def is_small_int(self):
"""Return true if the op pushes a small integer to the stack"""
if 0x51 <= self <= 0x60 or self == 0:
return True
else:
return False
def __str__(self):
return repr(self)
def __repr__(self):
if self in OPCODE_NAMES:
return OPCODE_NAMES[self]
else:
return 'CScriptOp(0x%x)' % self
def __new__(cls, n):
try:
return _opcode_instances[n]
except IndexError:
assert len(_opcode_instances) == n
_opcode_instances.append(super().__new__(cls, n))
return _opcode_instances[n]
OPCODE_NAMES: Dict[CScriptOp, str] = {}
_opcode_instances: List[CScriptOp] = []
# Populate opcode instance table
for n in range(0xff + 1):
CScriptOp(n)
# push value
OP_0 = CScriptOp(0x00)
OP_FALSE = OP_0
OP_PUSHDATA1 = CScriptOp(0x4c)
OP_PUSHDATA2 = CScriptOp(0x4d)
OP_PUSHDATA4 = CScriptOp(0x4e)
OP_1NEGATE = CScriptOp(0x4f)
OP_RESERVED = CScriptOp(0x50)
OP_1 = CScriptOp(0x51)
OP_TRUE = OP_1
OP_2 = CScriptOp(0x52)
OP_3 = CScriptOp(0x53)
OP_4 = CScriptOp(0x54)
OP_5 = CScriptOp(0x55)
OP_6 = CScriptOp(0x56)
OP_7 = CScriptOp(0x57)
OP_8 = CScriptOp(0x58)
OP_9 = CScriptOp(0x59)
OP_10 = CScriptOp(0x5a)
OP_11 = CScriptOp(0x5b)
OP_12 = CScriptOp(0x5c)
OP_13 = CScriptOp(0x5d)
OP_14 = CScriptOp(0x5e)
OP_15 = CScriptOp(0x5f)
OP_16 = CScriptOp(0x60)
# control
OP_NOP = CScriptOp(0x61)
OP_VER = CScriptOp(0x62)
OP_IF = CScriptOp(0x63)
OP_NOTIF = CScriptOp(0x64)
OP_VERIF = CScriptOp(0x65)
OP_VERNOTIF = CScriptOp(0x66)
OP_ELSE = CScriptOp(0x67)
OP_ENDIF = CScriptOp(0x68)
OP_VERIFY = CScriptOp(0x69)
OP_RETURN = CScriptOp(0x6a)
# stack ops
OP_TOALTSTACK = CScriptOp(0x6b)
OP_FROMALTSTACK = CScriptOp(0x6c)
OP_2DROP = CScriptOp(0x6d)
OP_2DUP = CScriptOp(0x6e)
OP_3DUP = CScriptOp(0x6f)
OP_2OVER = CScriptOp(0x70)
OP_2ROT = CScriptOp(0x71)
OP_2SWAP = CScriptOp(0x72)
OP_IFDUP = CScriptOp(0x73)
OP_DEPTH = CScriptOp(0x74)
OP_DROP = CScriptOp(0x75)
OP_DUP = CScriptOp(0x76)
OP_NIP = CScriptOp(0x77)
OP_OVER = CScriptOp(0x78)
OP_PICK = CScriptOp(0x79)
OP_ROLL = CScriptOp(0x7a)
OP_ROT = CScriptOp(0x7b)
OP_SWAP = CScriptOp(0x7c)
OP_TUCK = CScriptOp(0x7d)
# splice ops
OP_CAT = CScriptOp(0x7e)
OP_SUBSTR = CScriptOp(0x7f)
OP_LEFT = CScriptOp(0x80)
OP_RIGHT = CScriptOp(0x81)
OP_SIZE = CScriptOp(0x82)
# bit logic
OP_INVERT = CScriptOp(0x83)
OP_AND = CScriptOp(0x84)
OP_OR = CScriptOp(0x85)
OP_XOR = CScriptOp(0x86)
OP_EQUAL = CScriptOp(0x87)
OP_EQUALVERIFY = CScriptOp(0x88)
OP_RESERVED1 = CScriptOp(0x89)
OP_RESERVED2 = CScriptOp(0x8a)
# numeric
OP_1ADD = CScriptOp(0x8b)
OP_1SUB = CScriptOp(0x8c)
OP_2MUL = CScriptOp(0x8d)
OP_2DIV = CScriptOp(0x8e)
OP_NEGATE = CScriptOp(0x8f)
OP_ABS = CScriptOp(0x90)
OP_NOT = CScriptOp(0x91)
OP_0NOTEQUAL = CScriptOp(0x92)
OP_ADD = CScriptOp(0x93)
OP_SUB = CScriptOp(0x94)
OP_MUL = CScriptOp(0x95)
OP_DIV = CScriptOp(0x96)
OP_MOD = CScriptOp(0x97)
OP_LSHIFT = CScriptOp(0x98)
OP_RSHIFT = CScriptOp(0x99)
OP_BOOLAND = CScriptOp(0x9a)
OP_BOOLOR = CScriptOp(0x9b)
OP_NUMEQUAL = CScriptOp(0x9c)
OP_NUMEQUALVERIFY = CScriptOp(0x9d)
OP_NUMNOTEQUAL = CScriptOp(0x9e)
OP_LESSTHAN = CScriptOp(0x9f)
OP_GREATERTHAN = CScriptOp(0xa0)
OP_LESSTHANOREQUAL = CScriptOp(0xa1)
OP_GREATERTHANOREQUAL = CScriptOp(0xa2)
OP_MIN = CScriptOp(0xa3)
OP_MAX = CScriptOp(0xa4)
OP_WITHIN = CScriptOp(0xa5)
# crypto
OP_RIPEMD160 = CScriptOp(0xa6)
OP_SHA1 = CScriptOp(0xa7)
OP_SHA256 = CScriptOp(0xa8)
OP_HASH160 = CScriptOp(0xa9)
OP_HASH256 = CScriptOp(0xaa)
OP_CODESEPARATOR = CScriptOp(0xab)
OP_CHECKSIG = CScriptOp(0xac)
OP_CHECKSIGVERIFY = CScriptOp(0xad)
OP_CHECKMULTISIG = CScriptOp(0xae)
OP_CHECKMULTISIGVERIFY = CScriptOp(0xaf)
OP_CHECKSIGFROMSTACK = CScriptOp(0xc1)
OP_CHECKSIGFROMSTACKVERIFY = CScriptOp(0xc2)
# expansion
OP_NOP1 = CScriptOp(0xb0)
OP_CHECKLOCKTIMEVERIFY = CScriptOp(0xb1)
OP_CHECKSEQUENCEVERIFY = CScriptOp(0xb2)
OP_NOP4 = CScriptOp(0xb3)
OP_NOP5 = CScriptOp(0xb4)
OP_NOP6 = CScriptOp(0xb5)
OP_NOP7 = CScriptOp(0xb6)
OP_NOP8 = CScriptOp(0xb7)
OP_NOP9 = CScriptOp(0xb8)
OP_NOP10 = CScriptOp(0xb9)
# BIP 342 opcodes (Tapscript)
OP_CHECKSIGADD = CScriptOp(0xba)
# Elements Tapscript extension
OP_SHA256INITIALIZE = CScriptOp(0xc4)
OP_SHA256UPDATE = CScriptOp(0xc5)
OP_SHA256FINALIZE = CScriptOp(0xc6)
# inputs
OP_INSPECTINPUTOUTPOINT = CScriptOp(0xc7)
OP_INSPECTINPUTASSET = CScriptOp(0xc8)
OP_INSPECTINPUTVALUE = CScriptOp(0xc9)
OP_INSPECTINPUTSCRIPTPUBKEY = CScriptOp(0xca)
OP_INSPECTINPUTSEQUENCE = CScriptOp(0xcb)
OP_INSPECTINPUTISSUANCE = CScriptOp(0xcc)
# current index
OP_PUSHCURRENTINPUTINDEX = CScriptOp(0xcd)
# outputs
OP_INSPECTOUTPUTASSET = CScriptOp(0xce)
OP_INSPECTOUTPUTVALUE = CScriptOp(0xcf)
OP_INSPECTOUTPUTNONCE = CScriptOp(0xd0)
OP_INSPECTOUTPUTSCRIPTPUBKEY = CScriptOp(0xd1)
# transaction
OP_INSPECTVERSION = CScriptOp(0xd2)
OP_INSPECTLOCKTIME = CScriptOp(0xd3)
OP_INSPECTNUMINPUTS = CScriptOp(0xd4)
OP_INSPECTNUMOUTPUTS = CScriptOp(0xd5)
OP_TXWEIGHT = CScriptOp(0xd6)
# Arithmetic opcodes
OP_ADD64 = CScriptOp(0xd7)
OP_SUB64 = CScriptOp(0xd8)
OP_MUL64 = CScriptOp(0xd9)
OP_DIV64 = CScriptOp(0xda)
OP_NEG64 = CScriptOp(0xdb)
OP_LESSTHAN64 = CScriptOp(0xdc)
OP_LESSTHANOREQUAL64 = CScriptOp(0xdd)
OP_GREATERTHAN64 = CScriptOp(0xde)
OP_GREATERTHANOREQUAL64 = CScriptOp(0xdf)
# Conversion opcodes
OP_SCRIPTNUMTOLE64 = CScriptOp(0xe0)
OP_LE64TOSCRIPTNUM = CScriptOp(0xe1)
OP_LE32TOLE64 = CScriptOp(0xe2)
# Tapscript crypto opcodes
OP_ECMULSCALARVERIFY = CScriptOp(0xe3)
OP_TWEAKVERIFY = CScriptOp(0xe4)
OP_INVALIDOPCODE = CScriptOp(0xff)
OPCODE_NAMES.update({
OP_0: 'OP_0',
OP_PUSHDATA1: 'OP_PUSHDATA1',
OP_PUSHDATA2: 'OP_PUSHDATA2',
OP_PUSHDATA4: 'OP_PUSHDATA4',
OP_1NEGATE: 'OP_1NEGATE',
OP_RESERVED: 'OP_RESERVED',
OP_1: 'OP_1',
OP_2: 'OP_2',
OP_3: 'OP_3',
OP_4: 'OP_4',
OP_5: 'OP_5',
OP_6: 'OP_6',
OP_7: 'OP_7',
OP_8: 'OP_8',
OP_9: 'OP_9',
OP_10: 'OP_10',
OP_11: 'OP_11',
OP_12: 'OP_12',
OP_13: 'OP_13',
OP_14: 'OP_14',
OP_15: 'OP_15',
OP_16: 'OP_16',
OP_NOP: 'OP_NOP',
OP_VER: 'OP_VER',
OP_IF: 'OP_IF',
OP_NOTIF: 'OP_NOTIF',
OP_VERIF: 'OP_VERIF',
OP_VERNOTIF: 'OP_VERNOTIF',
OP_ELSE: 'OP_ELSE',
OP_ENDIF: 'OP_ENDIF',
OP_VERIFY: 'OP_VERIFY',
OP_RETURN: 'OP_RETURN',
OP_TOALTSTACK: 'OP_TOALTSTACK',
OP_FROMALTSTACK: 'OP_FROMALTSTACK',
OP_2DROP: 'OP_2DROP',
OP_2DUP: 'OP_2DUP',
OP_3DUP: 'OP_3DUP',
OP_2OVER: 'OP_2OVER',
OP_2ROT: 'OP_2ROT',
OP_2SWAP: 'OP_2SWAP',
OP_IFDUP: 'OP_IFDUP',
OP_DEPTH: 'OP_DEPTH',
OP_DROP: 'OP_DROP',
OP_DUP: 'OP_DUP',
OP_NIP: 'OP_NIP',
OP_OVER: 'OP_OVER',
OP_PICK: 'OP_PICK',
OP_ROLL: 'OP_ROLL',
OP_ROT: 'OP_ROT',
OP_SWAP: 'OP_SWAP',
OP_TUCK: 'OP_TUCK',
OP_CAT: 'OP_CAT',
OP_SUBSTR: 'OP_SUBSTR',
OP_LEFT: 'OP_LEFT',
OP_RIGHT: 'OP_RIGHT',
OP_SIZE: 'OP_SIZE',
OP_INVERT: 'OP_INVERT',
OP_AND: 'OP_AND',
OP_OR: 'OP_OR',
OP_XOR: 'OP_XOR',
OP_EQUAL: 'OP_EQUAL',
OP_EQUALVERIFY: 'OP_EQUALVERIFY',
OP_RESERVED1: 'OP_RESERVED1',
OP_RESERVED2: 'OP_RESERVED2',
OP_1ADD: 'OP_1ADD',
OP_1SUB: 'OP_1SUB',
OP_2MUL: 'OP_2MUL',
OP_2DIV: 'OP_2DIV',
OP_NEGATE: 'OP_NEGATE',
OP_ABS: 'OP_ABS',
OP_NOT: 'OP_NOT',
OP_0NOTEQUAL: 'OP_0NOTEQUAL',
OP_ADD: 'OP_ADD',
OP_SUB: 'OP_SUB',
OP_MUL: 'OP_MUL',
OP_DIV: 'OP_DIV',
OP_MOD: 'OP_MOD',
OP_LSHIFT: 'OP_LSHIFT',
OP_RSHIFT: 'OP_RSHIFT',
OP_BOOLAND: 'OP_BOOLAND',
OP_BOOLOR: 'OP_BOOLOR',
OP_NUMEQUAL: 'OP_NUMEQUAL',
OP_NUMEQUALVERIFY: 'OP_NUMEQUALVERIFY',
OP_NUMNOTEQUAL: 'OP_NUMNOTEQUAL',
OP_LESSTHAN: 'OP_LESSTHAN',
OP_GREATERTHAN: 'OP_GREATERTHAN',
OP_LESSTHANOREQUAL: 'OP_LESSTHANOREQUAL',
OP_GREATERTHANOREQUAL: 'OP_GREATERTHANOREQUAL',
OP_MIN: 'OP_MIN',
OP_MAX: 'OP_MAX',
OP_WITHIN: 'OP_WITHIN',
OP_RIPEMD160: 'OP_RIPEMD160',
OP_SHA1: 'OP_SHA1',
OP_SHA256: 'OP_SHA256',
OP_HASH160: 'OP_HASH160',
OP_HASH256: 'OP_HASH256',
OP_CODESEPARATOR: 'OP_CODESEPARATOR',
OP_CHECKSIG: 'OP_CHECKSIG',
OP_CHECKSIGVERIFY: 'OP_CHECKSIGVERIFY',
OP_CHECKMULTISIG: 'OP_CHECKMULTISIG',
OP_CHECKMULTISIGVERIFY: 'OP_CHECKMULTISIGVERIFY',
OP_NOP1: 'OP_NOP1',
OP_CHECKLOCKTIMEVERIFY: 'OP_CHECKLOCKTIMEVERIFY',
OP_CHECKSEQUENCEVERIFY: 'OP_CHECKSEQUENCEVERIFY',
OP_NOP4: 'OP_NOP4',
OP_NOP5: 'OP_NOP5',
OP_NOP6: 'OP_NOP6',
OP_NOP7: 'OP_NOP7',
OP_NOP8: 'OP_NOP8',
OP_NOP9: 'OP_NOP9',
OP_NOP10: 'OP_NOP10',
OP_CHECKSIGADD: 'OP_CHECKSIGADD',
OP_INVALIDOPCODE: 'OP_INVALIDOPCODE',
OP_SHA256INITIALIZE : 'OP_SHA256INITIALIZE',
OP_SHA256UPDATE : 'OP_SHA256UPDATE',
OP_SHA256FINALIZE : 'OP_SHA256FINALIZE',
OP_INSPECTINPUTOUTPOINT: 'OP_INSPECTINPUTOUTPOINT',
OP_INSPECTINPUTASSET: 'OP_INSPECTINPUTASSET',
OP_INSPECTINPUTVALUE: 'OP_INSPECTINPUTVALUE',
OP_INSPECTINPUTSCRIPTPUBKEY: 'OP_INSPECTINPUTSCRIPTPUBKEY',
OP_INSPECTINPUTSEQUENCE: 'OP_INSPECTINPUTSEQUENCE',
OP_INSPECTINPUTISSUANCE: 'OP_INSPECTINPUTISSUANCE',
OP_PUSHCURRENTINPUTINDEX: 'OP_PUSHCURRENTINPUTINDEX',
OP_INSPECTOUTPUTASSET: 'OP_INSPECTOUTPUTASSET',
OP_INSPECTOUTPUTVALUE: 'OP_INSPECTOUTPUTVALUE',
OP_INSPECTOUTPUTNONCE: 'OP_INSPECTOUTPUTNONCE',
OP_INSPECTOUTPUTSCRIPTPUBKEY: 'OP_INSPECTOUTPUTSCRIPTPUBKEY',
OP_INSPECTVERSION: 'OP_INSPECTVERSION',
OP_INSPECTLOCKTIME: 'OP_INSPECTLOCKTIME',
OP_INSPECTNUMINPUTS: 'OP_INSPECTNUMINPUTS',
OP_INSPECTNUMOUTPUTS: 'OP_INSPECTNUMOUTPUTS',
OP_TXWEIGHT: 'OP_TXWEIGHT',
OP_INVALIDOPCODE: 'OP_INVALIDOPCODE',
OP_CHECKSIGFROMSTACK: 'OP_CHECKSIGFROMSTACK',
OP_TWEAKVERIFY: 'OP_TWEAKVERIFY',
OP_ADD64: 'OP_ADD64',
OP_SUB64: 'OP_SUB64',
OP_MUL64: 'OP_MUL64',
OP_DIV64: 'OP_DIV64',
OP_LESSTHAN64: 'OP_LESSTHAN64',
OP_LESSTHANOREQUAL64: 'OP_LESSTHANOREQUAL64',
OP_GREATERTHAN64: 'OP_GREATERTHAN64',
OP_GREATERTHANOREQUAL64: 'OP_GREATERTHANOREQUAL64',
OP_NEG64: 'OP_NEG64',
OP_SCRIPTNUMTOLE64: 'OP_SCRIPTNUMTOLE64',
OP_LE64TOSCRIPTNUM: 'OP_LE64TOSCRIPTNUM',
OP_LE32TOLE64: 'OP_LE32TOLE64',
OP_CHECKSIGFROMSTACKVERIFY: 'OP_CHECKSIGFROMSTACKVERIFY',
OP_ECMULSCALARVERIFY: 'OP_ECMULSCALARVERIFY',
})
class CScriptInvalidError(Exception):
"""Base class for CScript exceptions"""
pass
class CScriptTruncatedPushDataError(CScriptInvalidError):
"""Invalid pushdata due to truncation"""
def __init__(self, msg, data):
self.data = data
super().__init__(msg)
# This is used, eg, for blockchain heights in coinbase scripts (bip34)
class CScriptNum:
__slots__ = ("value",)
def __init__(self, d=0):
self.value = d
@staticmethod
def encode(obj):
val = obj.value
r = bytearray(0)
if val == 0:
return bytes(r)
neg = val < 0
absvalue = -val if neg else val
while (absvalue):
r.append(absvalue & 0xff)
absvalue >>= 8
if r[-1] & 0x80:
r.append(0x80 if neg else 0)
elif neg:
r[-1] |= 0x80
return bytes([len(r)]) + r
@staticmethod
def decode(vch):
result = 0
# We assume valid push_size and minimal encoding
value = vch[1:]
if len(value) == 0:
return result
for i, byte in enumerate(value):
result |= int(byte) << 8 * i
if value[-1] >= 0x80:
# Mask for all but the highest result bit
num_mask = (2**(len(value) * 8) - 1) >> 1
result &= num_mask
result *= -1
return result
class CScript(bytes):
"""Serialized script
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
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.
iter(script) however does iterate by opcode.
"""
__slots__ = ()
@classmethod
def __coerce_instance(cls, other):
# Coerce other into bytes
if isinstance(other, CScriptOp):
other = bytes([other])
elif isinstance(other, CScriptNum):
if (other.value == 0):
other = bytes([CScriptOp(OP_0)])
else:
other = CScriptNum.encode(other)
elif isinstance(other, int):
if 0 <= other <= 16:
other = bytes([CScriptOp.encode_op_n(other)])
elif other == -1:
other = bytes([OP_1NEGATE])
else:
other = CScriptOp.encode_op_pushdata(bn2vch(other))
elif isinstance(other, (bytes, bytearray)):
other = CScriptOp.encode_op_pushdata(other)
return other
def __add__(self, other):
# add makes no sense for a CScript()
raise NotImplementedError
def join(self, iterable):
# join makes no sense for a CScript()
raise NotImplementedError
def __new__(cls, value=b''):
if isinstance(value, bytes) or isinstance(value, bytearray):
return super().__new__(cls, value)
else:
def coerce_iterable(iterable):
for instance in iterable:
yield cls.__coerce_instance(instance)
# Annoyingly on both python2 and python3 bytes.join() always
# returns a bytes instance even when subclassed.
return super().__new__(cls, b''.join(coerce_iterable(value)))
def raw_iter(self):
"""Raw iteration
Yields tuples of (opcode, data, sop_idx) so that the different possible
PUSHDATA encodings can be accurately distinguished, as well as
determining the exact opcode byte indexes. (sop_idx)
"""
i = 0
while i < len(self):
sop_idx = i
opcode = self[i]
i += 1
if opcode > OP_PUSHDATA4:
yield (opcode, None, sop_idx)
else:
datasize = None
pushdata_type = None
if opcode < OP_PUSHDATA1:
pushdata_type = 'PUSHDATA(%d)' % opcode
datasize = opcode
elif opcode == OP_PUSHDATA1:
pushdata_type = 'PUSHDATA1'
if i >= len(self):
raise CScriptInvalidError('PUSHDATA1: missing data length')
datasize = self[i]
i += 1
elif opcode == OP_PUSHDATA2:
pushdata_type = 'PUSHDATA2'
if i + 1 >= len(self):
raise CScriptInvalidError('PUSHDATA2: missing data length')
datasize = self[i] + (self[i + 1] << 8)
i += 2
elif opcode == OP_PUSHDATA4:
pushdata_type = 'PUSHDATA4'
if i + 3 >= len(self):
raise CScriptInvalidError('PUSHDATA4: missing data length')
datasize = self[i] + (self[i + 1] << 8) + (self[i + 2] << 16) + (self[i + 3] << 24)
i += 4
else:
assert False # shouldn't happen
data = bytes(self[i:i + datasize])
# Check for truncation
if len(data) < datasize:
raise CScriptTruncatedPushDataError('%s: truncated data' % pushdata_type, data)
i += datasize
yield (opcode, data, sop_idx)
def __iter__(self):
"""'Cooked' iteration
Returns either a CScriptOP instance, an integer, or bytes, as
appropriate.
See raw_iter() if you need to distinguish the different possible
PUSHDATA encodings.
"""
for (opcode, data, sop_idx) in self.raw_iter():
if data is not None:
yield data
else:
opcode = CScriptOp(opcode)
if opcode.is_small_int():
yield opcode.decode_op_n()
else:
yield CScriptOp(opcode)
def __repr__(self):
def _repr(o):
if isinstance(o, bytes):
return "x('%s')" % o.hex()
else:
return repr(o)
ops = []
i = iter(self)
while True:
op = None
try:
op = _repr(next(i))
except CScriptTruncatedPushDataError as err:
op = '%s...<ERROR: %s>' % (_repr(err.data), err)
break
except CScriptInvalidError as err:
op = '<ERROR: %s>' % err
break
except StopIteration:
break
finally:
if op is not None:
ops.append(op)
return "CScript([%s])" % ', '.join(ops)
def GetSigOpCount(self, fAccurate):
"""Get the SigOp count.
fAccurate - Accurately count CHECKMULTISIG, see BIP16 for details.
Note that this is consensus-critical.
"""
n = 0
lastOpcode = OP_INVALIDOPCODE
for (opcode, data, sop_idx) in self.raw_iter():
if opcode in (OP_CHECKSIG, OP_CHECKSIGVERIFY):
n += 1
elif opcode in (OP_CHECKMULTISIG, OP_CHECKMULTISIGVERIFY):
if fAccurate and (OP_1 <= lastOpcode <= OP_16):
n += opcode.decode_op_n()
else:
n += 20
lastOpcode = opcode
return n
SIGHASH_DEFAULT = 0 # Taproot-only default, semantics same as SIGHASH_ALL
SIGHASH_ALL = 1
SIGHASH_NONE = 2
SIGHASH_SINGLE = 3
SIGHASH_ANYONECANPAY = 0x80
# ELEMENTS:
SIGHASH_RANGEPROOF = 0x40
# Add the sighash byte to the signature(Taproot sigs only)
# Nothing is padded if sighash is default
def taproot_pad_sighash_ty(sig, sighash_ty):
if len(sig) != 64:
raise "Schnorr sigs must be 64 bytes"
if sighash_ty != SIGHASH_DEFAULT:
sig = sig + bytes([sighash_ty])
return sig
def FindAndDelete(script, sig):
"""Consensus critical, see FindAndDelete() in Satoshi codebase"""
r = b''
last_sop_idx = sop_idx = 0
skip = True
for (opcode, data, sop_idx) in script.raw_iter():
if not skip:
r += script[last_sop_idx:sop_idx]
last_sop_idx = sop_idx
if script[sop_idx:sop_idx + len(sig)] == sig:
skip = True
else:
skip = False
if not skip:
r += script[last_sop_idx:]
return CScript(r)
def LegacySignatureMsg(script, txTo, inIdx, hashtype, enable_sighash_rangeproof=True):
"""Preimage of the signature hash, if it exists.
Returns either (None, err) to indicate error (which translates to sighash 1),
or (msg, None).
"""
if inIdx >= len(txTo.vin):
return (None, "inIdx %d out of range (%d)" % (inIdx, len(txTo.vin)))
txtmp = CTransaction(txTo)
for txin in txtmp.vin:
txin.scriptSig = b''
txtmp.vin[inIdx].scriptSig = FindAndDelete(script, CScript([OP_CODESEPARATOR]))
if (hashtype & 0x1f) == SIGHASH_NONE:
txtmp.vout = []
for i in range(len(txtmp.vin)):
if i != inIdx:
txtmp.vin[i].nSequence = 0
elif (hashtype & 0x1f) == SIGHASH_SINGLE:
outIdx = inIdx
if outIdx >= len(txtmp.vout):
return (None, "outIdx %d out of range (%d)" % (outIdx, len(txtmp.vout)))
tmp = txtmp.vout[outIdx]
txtmp.vout = []
for _ in range(outIdx):
txtmp.vout.append(CTxOut(nValue=CTxOutValue(), nAsset=CTxOutAsset()))
txtmp.vout.append(tmp)
for i in range(len(txtmp.vin)):
if i != inIdx:
txtmp.vin[i].nSequence = 0
if hashtype & SIGHASH_ANYONECANPAY:
tmp = txtmp.vin[inIdx]
txtmp.vin = []
txtmp.vin.append(tmp)
# sighash serialization is different from non-witness serialization
# do manual sighash serialization:
s = b""
s += struct.pack("<i", txtmp.nVersion)
# ELEMENTS: vin serialization is different from non-witness serialization (pegin/issuance
# flags are not set in the sighash)
s += ser_compact_size(len(txtmp.vin))
for i in range(len(txtmp.vin)):
s += txtmp.vin[i].prevout.serialize()
s += ser_string(txtmp.vin[i].scriptSig)
s += struct.pack("<I", txtmp.vin[i].nSequence)
if not txtmp.vin[i].assetIssuance.isNull():
s += txtmp.vin[i].assetIssuance.serialize()
# If SIGHASH_RANGEPROOF is set, we need to add the rangeproof serialization after each output
if enable_sighash_rangeproof and hashtype & SIGHASH_RANGEPROOF:
s += ser_compact_size(len(txtmp.vout))
for i in range(len(txtmp.vout)):
s += txtmp.vout[i].serialize()
if i < len(txtmp.wit.vtxoutwit):
s += ser_string(txtmp.wit.vtxoutwit[i].vchRangeproof)
s += ser_string(txtmp.wit.vtxoutwit[i].vchSurjectionproof)
else:
s += bytes([0, 0])
else:
s += ser_vector(txtmp.vout)
s += struct.pack("<I", txtmp.nLockTime)
# add sighash type
s += struct.pack(b"<I", hashtype)
return (s, None)
def LegacySignatureHash(*args, **kwargs):
"""Consensus-correct SignatureHash
Returns (hash, err) to precisely match the consensus-critical behavior of
the SIGHASH_SINGLE bug. (inIdx is *not* checked for validity)
"""
HASH_ONE = b'\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
msg, err = LegacySignatureMsg(*args, **kwargs)
if msg is None:
return (HASH_ONE, err)
else:
return (hash256(msg), err)
# TODO: Allow cached hashPrevouts/hashSequence/hashOutputs to be provided.
# Performance optimization probably not necessary for python tests, however.
# Note that this corresponds to sigversion == 1 in EvalScript, which is used
# for version 0 witnesses.
def SegwitV0SignatureMsg(script, txTo, inIdx, hashtype, amount, enable_sighash_rangeproof=True):
hashPrevouts = 0
hashSequence = 0
hashIssuance = 0
hashOutputs = 0
hashRangeproofs = 0
if not (hashtype & SIGHASH_ANYONECANPAY):
serialize_prevouts = bytes()
for i in txTo.vin:
serialize_prevouts += i.prevout.serialize()
hashPrevouts = uint256_from_str(hash256(serialize_prevouts))
if (not (hashtype & SIGHASH_ANYONECANPAY) and (hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE):
serialize_sequence = bytes()
for i in txTo.vin:
serialize_sequence += struct.pack("<I", i.nSequence)
hashSequence = uint256_from_str(hash256(serialize_sequence))
if not (hashtype & SIGHASH_ANYONECANPAY):
serialize_issuance = bytes()
# TODO actually serialize issuances
for inp in txTo.vin:
if inp.assetIssuance.isNull():
serialize_issuance += b'\x00'
else:
serialize_issuance += inp.assetIssuance.serialize()
hashIssuance = uint256_from_str(hash256(serialize_issuance))
if ((hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE):
serialize_outputs = bytes()
for o in txTo.vout:
serialize_outputs += o.serialize()
hashOutputs = uint256_from_str(hash256(serialize_outputs))
if enable_sighash_rangeproof and hashtype & SIGHASH_RANGEPROOF:
serialize_rangeproofs = bytes()
for wit in txTo.wit.vtxoutwit:
serialize_rangeproofs += ser_string(wit.vchRangeproof) + ser_string(wit.vchSurjectionproof)
hashRangeproofs = uint256_from_str(hash256(serialize_rangeproofs))
elif ((hashtype & 0x1f) == SIGHASH_SINGLE and inIdx < len(txTo.vout)):
serialize_outputs = txTo.vout[inIdx].serialize()
hashOutputs = uint256_from_str(hash256(serialize_outputs))
if enable_sighash_rangeproof and hashtype & SIGHASH_RANGEPROOF:
serialize_rangeproofs = b'\x00'
if len(txTo.wit.vtxoutwit) > inIdx:
wit = txTo.wit.vtxoutwit[inIdx]
serialize_rangeproofs = ser_string(wit.vchRangeproof) + ser_string(wit.vchSurjectionproof)
hashRangeproofs = uint256_from_str(hash256(serialize_rangeproofs))
ss = bytes()
ss += struct.pack("<i", txTo.nVersion)
ss += ser_uint256(hashPrevouts)
ss += ser_uint256(hashSequence)
ss += ser_uint256(hashIssuance)
ss += txTo.vin[inIdx].prevout.serialize()
ss += ser_string(script)
ss += amount.serialize()
ss += struct.pack("<I", txTo.vin[inIdx].nSequence)
if not txTo.vin[inIdx].assetIssuance.isNull():
ss += txTo.vin[inIdx].assetIssuance.serialize()
ss += ser_uint256(hashOutputs)
if enable_sighash_rangeproof and hashtype & SIGHASH_RANGEPROOF:
ss += ser_uint256(hashRangeproofs)
ss += struct.pack("<i", txTo.nLockTime)
ss += struct.pack("<I", hashtype)
return ss
def SegwitV0SignatureHash(*args, **kwargs):
return hash256(SegwitV0SignatureMsg(*args, **kwargs))
class TestFrameworkScript(unittest.TestCase):
def test_bn2vch(self):
self.assertEqual(bn2vch(0), bytes([]))
self.assertEqual(bn2vch(1), bytes([0x01]))
self.assertEqual(bn2vch(-1), bytes([0x81]))
self.assertEqual(bn2vch(0x7F), bytes([0x7F]))
self.assertEqual(bn2vch(-0x7F), bytes([0xFF]))
self.assertEqual(bn2vch(0x80), bytes([0x80, 0x00]))
self.assertEqual(bn2vch(-0x80), bytes([0x80, 0x80]))
self.assertEqual(bn2vch(0xFF), bytes([0xFF, 0x00]))
self.assertEqual(bn2vch(-0xFF), bytes([0xFF, 0x80]))
self.assertEqual(bn2vch(0x100), bytes([0x00, 0x01]))
self.assertEqual(bn2vch(-0x100), bytes([0x00, 0x81]))
self.assertEqual(bn2vch(0x7FFF), bytes([0xFF, 0x7F]))
self.assertEqual(bn2vch(-0x8000), bytes([0x00, 0x80, 0x80]))
self.assertEqual(bn2vch(-0x7FFFFF), bytes([0xFF, 0xFF, 0xFF]))
self.assertEqual(bn2vch(0x80000000), bytes([0x00, 0x00, 0x00, 0x80, 0x00]))
self.assertEqual(bn2vch(-0x80000000), bytes([0x00, 0x00, 0x00, 0x80, 0x80]))
self.assertEqual(bn2vch(0xFFFFFFFF), bytes([0xFF, 0xFF, 0xFF, 0xFF, 0x00]))
self.assertEqual(bn2vch(123456789), bytes([0x15, 0xCD, 0x5B, 0x07]))
self.assertEqual(bn2vch(-54321), bytes([0x31, 0xD4, 0x80]))
def test_cscriptnum_encoding(self):
# round-trip negative and multi-byte CScriptNums
values = [0, 1, -1, -2, 127, 128, -255, 256, (1 << 15) - 1, -(1 << 16), (1 << 24) - 1, (1 << 31), 1 - (1 << 32), 1 << 40, 1500, -1500]
for value in values:
self.assertEqual(CScriptNum.decode(CScriptNum.encode(CScriptNum(value))), value)
def BIP341_sha_prevouts(txTo):
return sha256(b"".join(i.prevout.serialize() for i in txTo.vin))
def BIP341_sha_amounts(spent_utxos):
return sha256(b"".join(u.nAsset.serialize() + u.nValue.serialize() for u in spent_utxos))
def BIP341_sha_scriptpubkeys(spent_utxos):
return sha256(b"".join(ser_string(u.scriptPubKey) for u in spent_utxos))
def BIP341_sha_sequences(txTo):
return sha256(b"".join(struct.pack("<I", i.nSequence) for i in txTo.vin))
def BIP341_sha_outputs(txTo):
return sha256(b"".join(o.serialize() for o in txTo.vout))
def TaprootSignatureMsg(txTo, spent_utxos, hash_type, genesis_hash, input_index = 0, scriptpath = False, script = CScript(), codeseparator_pos = -1, annex = None, leaf_ver = LEAF_VERSION_TAPSCRIPT):
assert (len(txTo.vin) == len(spent_utxos))
assert (input_index < len(txTo.vin))
out_type = SIGHASH_ALL if hash_type == 0 else hash_type & 3
in_type = hash_type & SIGHASH_ANYONECANPAY
spk = spent_utxos[input_index].scriptPubKey
ss = b""
ss += ser_uint256(genesis_hash)
ss += ser_uint256(genesis_hash)
ss += bytes([hash_type]) # hash_type
ss += struct.pack("<i", txTo.nVersion)
ss += struct.pack("<I", txTo.nLockTime)
if in_type != SIGHASH_ANYONECANPAY:
ss += sha256(b"".join(struct.pack("B", ((not i.assetIssuance.isNull()) << 7) + (i.m_is_pegin << 6)) for i in txTo.vin))
ss += BIP341_sha_prevouts(txTo)
ss += BIP341_sha_amounts(spent_utxos)
ss += BIP341_sha_scriptpubkeys(spent_utxos)
ss += BIP341_sha_sequences(txTo)
ss += sha256(b"".join(i.assetIssuance.taphash_asset_issuance_serialize() for i in txTo.vin))
ss += sha256(b"".join(iwit.serialize_issuance_proofs() for iwit in txTo.wit.vtxinwit))
if out_type == SIGHASH_ALL:
ss += BIP341_sha_outputs(txTo)
ss += sha256(b"".join(owit.serialize() for owit in txTo.wit.vtxoutwit))
spend_type = 0
if annex is not None:
spend_type |= 1
if (scriptpath):
spend_type |= 2
ss += bytes([spend_type])
if in_type == SIGHASH_ANYONECANPAY:
ss += struct.pack("B", ((not txTo.vin[input_index].assetIssuance.isNull()) << 7) + (txTo.vin[input_index].m_is_pegin << 6))
ss += txTo.vin[input_index].prevout.serialize()
ss += spent_utxos[input_index].nAsset.serialize()
ss += spent_utxos[input_index].nValue.serialize()
ss += ser_string(spk)
ss += struct.pack("<I", txTo.vin[input_index].nSequence)
if txTo.vin[input_index].assetIssuance.isNull():
ss += b'\x00'
else:
ss += txTo.vin[input_index].assetIssuance.serialize()
ss += sha256(txTo.wit.vtxinwit[input_index].serialize_issuance_proofs())
else:
ss += struct.pack("<I", input_index)
if (spend_type & 1):
ss += sha256(ser_string(annex))
if out_type == SIGHASH_SINGLE:
if input_index < len(txTo.vout):
ss += sha256(txTo.vout[input_index].serialize())
ss += sha256(txTo.wit.vtxoutwit[input_index].serialize())
else:
# Why do we have a case for in > len ?
# Maybe useful in testing. C++ code should never reach here
ss += bytes(0 for _ in range(32))
ss += bytes(0 for _ in range(32))
if (scriptpath):
ss += TaggedHash("TapLeaf/elements", bytes([leaf_ver]) + ser_string(script))
ss += bytes([0])
ss += struct.pack("<i", codeseparator_pos)
# ELEMENTS -35 since we encode nAsset (33) + nValue (9) + nNonce (1) rather than nValue (8)
exp_non_acp_len = 366 - (out_type != SIGHASH_ALL and out_type != SIGHASH_SINGLE) * 64 + (annex is not None) * 32 + scriptpath * 37
if in_type != SIGHASH_ANYONECANPAY:
assert len(ss) == exp_non_acp_len
else:
# 119 when explicit outs with no issuance. 304 when when conf tx with conf issuances.
assert len(ss) >= exp_non_acp_len - (228 - 119)
assert len(ss) <= exp_non_acp_len - (228 - 304)
return ss
def TaprootSignatureHash(*args, **kwargs):