896 lines
23 KiB
896 lines
23 KiB
# |
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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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# Distributed under the MIT/X11 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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"""Scripts |
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Functionality to build scripts, as well as SignatureHash(). |
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""" |
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from __future__ import absolute_import, division, print_function, unicode_literals |
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from test_framework.mininode import CTransaction, CTxOut, hash256 |
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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 copy |
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import struct |
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from test_framework.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_NOP2 = CScriptOp(0xb1) |
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OP_NOP3 = 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_NOP2, |
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OP_NOP3, |
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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_NOP2 : 'OP_NOP2', |
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OP_NOP3 : 'OP_NOP3', |
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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', |
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OP_INVALIDOPCODE : 'OP_INVALIDOPCODE', |
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}) |
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OPCODES_BY_NAME = { |
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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, |
|
'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_NOP2' : OP_NOP2, |
|
'OP_NOP3' : OP_NOP3, |
|
'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(chr(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, long)): |
|
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 "x('%s')" % binascii.hexlify(o).decode('utf8') |
|
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)
|
|
|