898 lines
23 KiB
Python
898 lines
23 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2015-2016 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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#
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# script.py
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#
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# This file is modified from python-bitcoinlib.
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#
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"""Scripts
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Functionality to build scripts, as well as SignatureHash().
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"""
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from .mininode import CTransaction, CTxOut, hash256
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from binascii import hexlify
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import sys
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bchr = chr
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bord = ord
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if sys.version > '3':
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long = int
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bchr = lambda x: bytes([x])
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bord = lambda x: x
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import struct
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from .bignum import bn2vch
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MAX_SCRIPT_SIZE = 10000
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MAX_SCRIPT_ELEMENT_SIZE = 520
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MAX_SCRIPT_OPCODES = 201
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OPCODE_NAMES = {}
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_opcode_instances = []
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class CScriptOp(int):
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"""A single script opcode"""
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__slots__ = []
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@staticmethod
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def encode_op_pushdata(d):
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"""Encode a PUSHDATA op, returning bytes"""
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if len(d) < 0x4c:
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return b'' + bchr(len(d)) + d # OP_PUSHDATA
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elif len(d) <= 0xff:
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return b'\x4c' + bchr(len(d)) + d # OP_PUSHDATA1
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elif len(d) <= 0xffff:
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return b'\x4d' + struct.pack(b'<H', len(d)) + d # OP_PUSHDATA2
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elif len(d) <= 0xffffffff:
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return b'\x4e' + struct.pack(b'<I', len(d)) + d # OP_PUSHDATA4
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else:
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raise ValueError("Data too long to encode in a PUSHDATA op")
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@staticmethod
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def encode_op_n(n):
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"""Encode a small integer op, returning an opcode"""
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if not (0 <= n <= 16):
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raise ValueError('Integer must be in range 0 <= n <= 16, got %d' % n)
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if n == 0:
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return OP_0
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else:
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return CScriptOp(OP_1 + n-1)
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def decode_op_n(self):
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"""Decode a small integer opcode, returning an integer"""
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if self == OP_0:
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return 0
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if not (self == OP_0 or OP_1 <= self <= OP_16):
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raise ValueError('op %r is not an OP_N' % self)
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return int(self - OP_1+1)
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def is_small_int(self):
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"""Return true if the op pushes a small integer to the stack"""
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if 0x51 <= self <= 0x60 or self == 0:
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return True
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else:
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return False
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def __str__(self):
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return repr(self)
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def __repr__(self):
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if self in OPCODE_NAMES:
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return OPCODE_NAMES[self]
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else:
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return 'CScriptOp(0x%x)' % self
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def __new__(cls, n):
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try:
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return _opcode_instances[n]
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except IndexError:
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assert len(_opcode_instances) == n
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_opcode_instances.append(super(CScriptOp, cls).__new__(cls, n))
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return _opcode_instances[n]
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# Populate opcode instance table
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for n in range(0xff+1):
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CScriptOp(n)
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# push value
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OP_0 = CScriptOp(0x00)
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OP_FALSE = OP_0
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OP_PUSHDATA1 = CScriptOp(0x4c)
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OP_PUSHDATA2 = CScriptOp(0x4d)
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OP_PUSHDATA4 = CScriptOp(0x4e)
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OP_1NEGATE = CScriptOp(0x4f)
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OP_RESERVED = CScriptOp(0x50)
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OP_1 = CScriptOp(0x51)
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OP_TRUE=OP_1
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OP_2 = CScriptOp(0x52)
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OP_3 = CScriptOp(0x53)
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OP_4 = CScriptOp(0x54)
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OP_5 = CScriptOp(0x55)
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OP_6 = CScriptOp(0x56)
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OP_7 = CScriptOp(0x57)
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OP_8 = CScriptOp(0x58)
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OP_9 = CScriptOp(0x59)
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OP_10 = CScriptOp(0x5a)
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OP_11 = CScriptOp(0x5b)
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OP_12 = CScriptOp(0x5c)
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OP_13 = CScriptOp(0x5d)
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OP_14 = CScriptOp(0x5e)
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OP_15 = CScriptOp(0x5f)
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OP_16 = CScriptOp(0x60)
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# control
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OP_NOP = CScriptOp(0x61)
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OP_VER = CScriptOp(0x62)
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OP_IF = CScriptOp(0x63)
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OP_NOTIF = CScriptOp(0x64)
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OP_VERIF = CScriptOp(0x65)
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OP_VERNOTIF = CScriptOp(0x66)
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OP_ELSE = CScriptOp(0x67)
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OP_ENDIF = CScriptOp(0x68)
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OP_VERIFY = CScriptOp(0x69)
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OP_RETURN = CScriptOp(0x6a)
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# stack ops
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OP_TOALTSTACK = CScriptOp(0x6b)
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OP_FROMALTSTACK = CScriptOp(0x6c)
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OP_2DROP = CScriptOp(0x6d)
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OP_2DUP = CScriptOp(0x6e)
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OP_3DUP = CScriptOp(0x6f)
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OP_2OVER = CScriptOp(0x70)
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OP_2ROT = CScriptOp(0x71)
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OP_2SWAP = CScriptOp(0x72)
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OP_IFDUP = CScriptOp(0x73)
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OP_DEPTH = CScriptOp(0x74)
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OP_DROP = CScriptOp(0x75)
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OP_DUP = CScriptOp(0x76)
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OP_NIP = CScriptOp(0x77)
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OP_OVER = CScriptOp(0x78)
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OP_PICK = CScriptOp(0x79)
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OP_ROLL = CScriptOp(0x7a)
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OP_ROT = CScriptOp(0x7b)
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OP_SWAP = CScriptOp(0x7c)
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OP_TUCK = CScriptOp(0x7d)
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# splice ops
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OP_CAT = CScriptOp(0x7e)
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OP_SUBSTR = CScriptOp(0x7f)
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OP_LEFT = CScriptOp(0x80)
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OP_RIGHT = CScriptOp(0x81)
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OP_SIZE = CScriptOp(0x82)
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# bit logic
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OP_INVERT = CScriptOp(0x83)
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OP_AND = CScriptOp(0x84)
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OP_OR = CScriptOp(0x85)
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OP_XOR = CScriptOp(0x86)
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OP_EQUAL = CScriptOp(0x87)
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OP_EQUALVERIFY = CScriptOp(0x88)
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OP_RESERVED1 = CScriptOp(0x89)
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OP_RESERVED2 = CScriptOp(0x8a)
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# numeric
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OP_1ADD = CScriptOp(0x8b)
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OP_1SUB = CScriptOp(0x8c)
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OP_2MUL = CScriptOp(0x8d)
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OP_2DIV = CScriptOp(0x8e)
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OP_NEGATE = CScriptOp(0x8f)
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OP_ABS = CScriptOp(0x90)
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OP_NOT = CScriptOp(0x91)
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OP_0NOTEQUAL = CScriptOp(0x92)
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OP_ADD = CScriptOp(0x93)
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OP_SUB = CScriptOp(0x94)
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OP_MUL = CScriptOp(0x95)
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OP_DIV = CScriptOp(0x96)
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OP_MOD = CScriptOp(0x97)
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OP_LSHIFT = CScriptOp(0x98)
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OP_RSHIFT = CScriptOp(0x99)
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OP_BOOLAND = CScriptOp(0x9a)
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OP_BOOLOR = CScriptOp(0x9b)
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OP_NUMEQUAL = CScriptOp(0x9c)
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OP_NUMEQUALVERIFY = CScriptOp(0x9d)
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OP_NUMNOTEQUAL = CScriptOp(0x9e)
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OP_LESSTHAN = CScriptOp(0x9f)
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OP_GREATERTHAN = CScriptOp(0xa0)
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OP_LESSTHANOREQUAL = CScriptOp(0xa1)
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OP_GREATERTHANOREQUAL = CScriptOp(0xa2)
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OP_MIN = CScriptOp(0xa3)
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OP_MAX = CScriptOp(0xa4)
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OP_WITHIN = CScriptOp(0xa5)
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# crypto
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OP_RIPEMD160 = CScriptOp(0xa6)
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OP_SHA1 = CScriptOp(0xa7)
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OP_SHA256 = CScriptOp(0xa8)
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OP_HASH160 = CScriptOp(0xa9)
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OP_HASH256 = CScriptOp(0xaa)
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OP_CODESEPARATOR = CScriptOp(0xab)
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OP_CHECKSIG = CScriptOp(0xac)
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OP_CHECKSIGVERIFY = CScriptOp(0xad)
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OP_CHECKMULTISIG = CScriptOp(0xae)
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OP_CHECKMULTISIGVERIFY = CScriptOp(0xaf)
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# expansion
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OP_NOP1 = CScriptOp(0xb0)
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OP_CHECKLOCKTIMEVERIFY = CScriptOp(0xb1)
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OP_CHECKSEQUENCEVERIFY = CScriptOp(0xb2)
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OP_NOP4 = CScriptOp(0xb3)
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OP_NOP5 = CScriptOp(0xb4)
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OP_NOP6 = CScriptOp(0xb5)
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OP_NOP7 = CScriptOp(0xb6)
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OP_NOP8 = CScriptOp(0xb7)
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OP_NOP9 = CScriptOp(0xb8)
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OP_NOP10 = CScriptOp(0xb9)
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# template matching params
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OP_SMALLINTEGER = CScriptOp(0xfa)
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OP_PUBKEYS = CScriptOp(0xfb)
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OP_PUBKEYHASH = CScriptOp(0xfd)
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OP_PUBKEY = CScriptOp(0xfe)
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OP_INVALIDOPCODE = CScriptOp(0xff)
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VALID_OPCODES = {
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OP_1NEGATE,
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OP_RESERVED,
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OP_1,
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OP_2,
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OP_3,
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OP_4,
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OP_5,
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OP_6,
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OP_7,
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OP_8,
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OP_9,
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OP_10,
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OP_11,
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OP_12,
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OP_13,
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OP_14,
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OP_15,
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OP_16,
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OP_NOP,
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OP_VER,
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OP_IF,
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OP_NOTIF,
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OP_VERIF,
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OP_VERNOTIF,
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OP_ELSE,
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OP_ENDIF,
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OP_VERIFY,
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OP_RETURN,
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OP_TOALTSTACK,
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OP_FROMALTSTACK,
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OP_2DROP,
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OP_2DUP,
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OP_3DUP,
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OP_2OVER,
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OP_2ROT,
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OP_2SWAP,
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OP_IFDUP,
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OP_DEPTH,
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OP_DROP,
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OP_DUP,
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OP_NIP,
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OP_OVER,
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OP_PICK,
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OP_ROLL,
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OP_ROT,
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OP_SWAP,
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OP_TUCK,
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OP_CAT,
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OP_SUBSTR,
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OP_LEFT,
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OP_RIGHT,
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OP_SIZE,
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OP_INVERT,
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OP_AND,
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OP_OR,
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OP_XOR,
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OP_EQUAL,
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OP_EQUALVERIFY,
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OP_RESERVED1,
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OP_RESERVED2,
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OP_1ADD,
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OP_1SUB,
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OP_2MUL,
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OP_2DIV,
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OP_NEGATE,
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OP_ABS,
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OP_NOT,
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OP_0NOTEQUAL,
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OP_ADD,
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OP_SUB,
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OP_MUL,
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OP_DIV,
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OP_MOD,
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OP_LSHIFT,
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OP_RSHIFT,
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OP_BOOLAND,
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OP_BOOLOR,
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OP_NUMEQUAL,
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OP_NUMEQUALVERIFY,
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OP_NUMNOTEQUAL,
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OP_LESSTHAN,
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OP_GREATERTHAN,
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OP_LESSTHANOREQUAL,
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OP_GREATERTHANOREQUAL,
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OP_MIN,
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OP_MAX,
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OP_WITHIN,
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OP_RIPEMD160,
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OP_SHA1,
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OP_SHA256,
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OP_HASH160,
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OP_HASH256,
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OP_CODESEPARATOR,
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OP_CHECKSIG,
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OP_CHECKSIGVERIFY,
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OP_CHECKMULTISIG,
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OP_CHECKMULTISIGVERIFY,
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OP_NOP1,
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OP_CHECKLOCKTIMEVERIFY,
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OP_CHECKSEQUENCEVERIFY,
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OP_NOP4,
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OP_NOP5,
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OP_NOP6,
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OP_NOP7,
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OP_NOP8,
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OP_NOP9,
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OP_NOP10,
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OP_SMALLINTEGER,
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OP_PUBKEYS,
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OP_PUBKEYHASH,
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OP_PUBKEY,
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}
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OPCODE_NAMES.update({
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OP_0 : 'OP_0',
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OP_PUSHDATA1 : 'OP_PUSHDATA1',
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OP_PUSHDATA2 : 'OP_PUSHDATA2',
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OP_PUSHDATA4 : 'OP_PUSHDATA4',
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OP_1NEGATE : 'OP_1NEGATE',
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OP_RESERVED : 'OP_RESERVED',
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OP_1 : 'OP_1',
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OP_2 : 'OP_2',
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OP_3 : 'OP_3',
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OP_4 : 'OP_4',
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OP_5 : 'OP_5',
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OP_6 : 'OP_6',
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OP_7 : 'OP_7',
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OP_8 : 'OP_8',
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OP_9 : 'OP_9',
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OP_10 : 'OP_10',
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OP_11 : 'OP_11',
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OP_12 : 'OP_12',
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OP_13 : 'OP_13',
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OP_14 : 'OP_14',
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OP_15 : 'OP_15',
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OP_16 : 'OP_16',
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OP_NOP : 'OP_NOP',
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OP_VER : 'OP_VER',
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OP_IF : 'OP_IF',
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OP_NOTIF : 'OP_NOTIF',
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OP_VERIF : 'OP_VERIF',
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OP_VERNOTIF : 'OP_VERNOTIF',
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OP_ELSE : 'OP_ELSE',
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OP_ENDIF : 'OP_ENDIF',
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OP_VERIFY : 'OP_VERIFY',
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OP_RETURN : 'OP_RETURN',
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OP_TOALTSTACK : 'OP_TOALTSTACK',
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OP_FROMALTSTACK : 'OP_FROMALTSTACK',
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OP_2DROP : 'OP_2DROP',
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OP_2DUP : 'OP_2DUP',
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OP_3DUP : 'OP_3DUP',
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OP_2OVER : 'OP_2OVER',
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OP_2ROT : 'OP_2ROT',
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OP_2SWAP : 'OP_2SWAP',
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OP_IFDUP : 'OP_IFDUP',
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OP_DEPTH : 'OP_DEPTH',
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OP_DROP : 'OP_DROP',
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OP_DUP : 'OP_DUP',
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OP_NIP : 'OP_NIP',
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OP_OVER : 'OP_OVER',
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OP_PICK : 'OP_PICK',
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OP_ROLL : 'OP_ROLL',
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OP_ROT : 'OP_ROT',
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OP_SWAP : 'OP_SWAP',
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OP_TUCK : 'OP_TUCK',
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OP_CAT : 'OP_CAT',
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OP_SUBSTR : 'OP_SUBSTR',
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OP_LEFT : 'OP_LEFT',
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OP_RIGHT : 'OP_RIGHT',
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OP_SIZE : 'OP_SIZE',
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OP_INVERT : 'OP_INVERT',
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OP_AND : 'OP_AND',
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OP_OR : 'OP_OR',
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OP_XOR : 'OP_XOR',
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OP_EQUAL : 'OP_EQUAL',
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OP_EQUALVERIFY : 'OP_EQUALVERIFY',
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OP_RESERVED1 : 'OP_RESERVED1',
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OP_RESERVED2 : 'OP_RESERVED2',
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OP_1ADD : 'OP_1ADD',
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OP_1SUB : 'OP_1SUB',
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OP_2MUL : 'OP_2MUL',
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OP_2DIV : 'OP_2DIV',
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OP_NEGATE : 'OP_NEGATE',
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OP_ABS : 'OP_ABS',
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OP_NOT : 'OP_NOT',
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OP_0NOTEQUAL : 'OP_0NOTEQUAL',
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OP_ADD : 'OP_ADD',
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OP_SUB : 'OP_SUB',
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OP_MUL : 'OP_MUL',
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OP_DIV : 'OP_DIV',
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OP_MOD : 'OP_MOD',
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OP_LSHIFT : 'OP_LSHIFT',
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OP_RSHIFT : 'OP_RSHIFT',
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OP_BOOLAND : 'OP_BOOLAND',
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OP_BOOLOR : 'OP_BOOLOR',
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OP_NUMEQUAL : 'OP_NUMEQUAL',
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OP_NUMEQUALVERIFY : 'OP_NUMEQUALVERIFY',
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OP_NUMNOTEQUAL : 'OP_NUMNOTEQUAL',
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OP_LESSTHAN : 'OP_LESSTHAN',
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OP_GREATERTHAN : 'OP_GREATERTHAN',
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OP_LESSTHANOREQUAL : 'OP_LESSTHANOREQUAL',
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OP_GREATERTHANOREQUAL : 'OP_GREATERTHANOREQUAL',
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OP_MIN : 'OP_MIN',
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OP_MAX : 'OP_MAX',
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OP_WITHIN : 'OP_WITHIN',
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OP_RIPEMD160 : 'OP_RIPEMD160',
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OP_SHA1 : 'OP_SHA1',
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OP_SHA256 : 'OP_SHA256',
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OP_HASH160 : 'OP_HASH160',
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OP_HASH256 : 'OP_HASH256',
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OP_CODESEPARATOR : 'OP_CODESEPARATOR',
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OP_CHECKSIG : 'OP_CHECKSIG',
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OP_CHECKSIGVERIFY : 'OP_CHECKSIGVERIFY',
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OP_CHECKMULTISIG : 'OP_CHECKMULTISIG',
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OP_CHECKMULTISIGVERIFY : 'OP_CHECKMULTISIGVERIFY',
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OP_NOP1 : 'OP_NOP1',
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OP_CHECKLOCKTIMEVERIFY : 'OP_CHECKLOCKTIMEVERIFY',
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OP_CHECKSEQUENCEVERIFY : 'OP_CHECKSEQUENCEVERIFY',
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OP_NOP4 : 'OP_NOP4',
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OP_NOP5 : 'OP_NOP5',
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OP_NOP6 : 'OP_NOP6',
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OP_NOP7 : 'OP_NOP7',
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OP_NOP8 : 'OP_NOP8',
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OP_NOP9 : 'OP_NOP9',
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OP_NOP10 : 'OP_NOP10',
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OP_SMALLINTEGER : 'OP_SMALLINTEGER',
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OP_PUBKEYS : 'OP_PUBKEYS',
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OP_PUBKEYHASH : 'OP_PUBKEYHASH',
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OP_PUBKEY : 'OP_PUBKEY',
|
|
OP_INVALIDOPCODE : 'OP_INVALIDOPCODE',
|
|
})
|
|
|
|
OPCODES_BY_NAME = {
|
|
'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_SMALLINTEGER' : OP_SMALLINTEGER,
|
|
'OP_PUBKEYS' : OP_PUBKEYS,
|
|
'OP_PUBKEYHASH' : OP_PUBKEYHASH,
|
|
'OP_PUBKEY' : OP_PUBKEY,
|
|
}
|
|
|
|
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(CScriptTruncatedPushDataError, self).__init__(msg)
|
|
|
|
# This is used, eg, for blockchain heights in coinbase scripts (bip34)
|
|
class CScriptNum(object):
|
|
def __init__(self, d=0):
|
|
self.value = d
|
|
|
|
@staticmethod
|
|
def encode(obj):
|
|
r = bytearray(0)
|
|
if obj.value == 0:
|
|
return bytes(r)
|
|
neg = obj.value < 0
|
|
absvalue = -obj.value if neg else obj.value
|
|
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(bchr(len(r)) + r)
|
|
|
|
|
|
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.
|
|
"""
|
|
@classmethod
|
|
def __coerce_instance(cls, other):
|
|
# Coerce other into bytes
|
|
if isinstance(other, CScriptOp):
|
|
other = bchr(other)
|
|
elif isinstance(other, CScriptNum):
|
|
if (other.value == 0):
|
|
other = bchr(CScriptOp(OP_0))
|
|
else:
|
|
other = CScriptNum.encode(other)
|
|
elif isinstance(other, int):
|
|
if 0 <= other <= 16:
|
|
other = bytes(bchr(CScriptOp.encode_op_n(other)))
|
|
elif other == -1:
|
|
other = bytes(bchr(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):
|
|
# Do the coercion outside of the try block so that errors in it are
|
|
# noticed.
|
|
other = self.__coerce_instance(other)
|
|
|
|
try:
|
|
# bytes.__add__ always returns bytes instances unfortunately
|
|
return CScript(super(CScript, self).__add__(other))
|
|
except TypeError:
|
|
raise TypeError('Can not add a %r instance to a CScript' % other.__class__)
|
|
|
|
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(CScript, cls).__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(CScript, cls).__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 = bord(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 = bord(self[i])
|
|
i += 1
|
|
|
|
elif opcode == OP_PUSHDATA2:
|
|
pushdata_type = 'PUSHDATA2'
|
|
if i + 1 >= len(self):
|
|
raise CScriptInvalidError('PUSHDATA2: missing data length')
|
|
datasize = bord(self[i]) + (bord(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 = bord(self[i]) + (bord(self[i+1]) << 8) + (bord(self[i+2]) << 16) + (bord(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):
|
|
# For Python3 compatibility add b before strings so testcases don't
|
|
# need to change
|
|
def _repr(o):
|
|
if isinstance(o, bytes):
|
|
return b"x('%s')" % hexlify(o).decode('ascii')
|
|
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_ALL = 1
|
|
SIGHASH_NONE = 2
|
|
SIGHASH_SINGLE = 3
|
|
SIGHASH_ANYONECANPAY = 0x80
|
|
|
|
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 SignatureHash(script, txTo, inIdx, hashtype):
|
|
"""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'
|
|
|
|
if inIdx >= len(txTo.vin):
|
|
return (HASH_ONE, "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 (HASH_ONE, "outIdx %d out of range (%d)" % (outIdx, len(txtmp.vout)))
|
|
|
|
tmp = txtmp.vout[outIdx]
|
|
txtmp.vout = []
|
|
for i in range(outIdx):
|
|
txtmp.vout.append(CTxOut())
|
|
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)
|
|
|
|
s = txtmp.serialize()
|
|
s += struct.pack(b"<I", hashtype)
|
|
|
|
hash = hash256(s)
|
|
|
|
return (hash, None)
|