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Diffstat (limited to 'qa/rpc-tests/script.py')
| -rw-r--r-- | qa/rpc-tests/script.py | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/qa/rpc-tests/script.py b/qa/rpc-tests/script.py new file mode 100644 index 0000000000..03695b8635 --- /dev/null +++ b/qa/rpc-tests/script.py @@ -0,0 +1,896 @@ +# +# script.py +# +# This file is modified from python-bitcoinlib. +# +# Distributed under the MIT/X11 software license, see the accompanying +# file COPYING or http://www.opensource.org/licenses/mit-license.php. +# + +"""Scripts + +Functionality to build scripts, as well as SignatureHash(). +""" + +from __future__ import absolute_import, division, print_function, unicode_literals + +from mininode import CTransaction, CTxOut, hash256 + +import sys +bchr = chr +bord = ord +if sys.version > '3': + long = int + bchr = lambda x: bytes([x]) + bord = lambda x: x + +import copy +import struct + +import bignum + +MAX_SCRIPT_SIZE = 10000 +MAX_SCRIPT_ELEMENT_SIZE = 520 +MAX_SCRIPT_OPCODES = 201 + +OPCODE_NAMES = {} + +_opcode_instances = [] +class CScriptOp(int): + """A single script opcode""" + __slots__ = [] + + @staticmethod + def encode_op_pushdata(d): + """Encode a PUSHDATA op, returning bytes""" + if len(d) < 0x4c: + return b'' + bchr(len(d)) + d # OP_PUSHDATA + elif len(d) <= 0xff: + return b'\x4c' + bchr(len(d)) + d # OP_PUSHDATA1 + elif len(d) <= 0xffff: + return b'\x4d' + struct.pack(b'<H', len(d)) + d # OP_PUSHDATA2 + elif len(d) <= 0xffffffff: + return b'\x4e' + struct.pack(b'<I', len(d)) + d # OP_PUSHDATA4 + else: + raise ValueError("Data too long to encode in a PUSHDATA op") + + @staticmethod + def encode_op_n(n): + """Encode a small integer op, returning an opcode""" + if not (0 <= n <= 16): + raise ValueError('Integer must be in range 0 <= n <= 16, got %d' % n) + + if n == 0: + return OP_0 + else: + return CScriptOp(OP_1 + n-1) + + def decode_op_n(self): + """Decode a small integer opcode, returning an integer""" + if self == OP_0: + return 0 + + if not (self == OP_0 or OP_1 <= self <= OP_16): + raise ValueError('op %r is not an OP_N' % self) + + return int(self - OP_1+1) + + def is_small_int(self): + """Return true if the op pushes a small integer to the stack""" + if 0x51 <= self <= 0x60 or self == 0: + return True + else: + return False + + def __str__(self): + return repr(self) + + def __repr__(self): + if self in OPCODE_NAMES: + return OPCODE_NAMES[self] + else: + return 'CScriptOp(0x%x)' % self + + def __new__(cls, n): + try: + return _opcode_instances[n] + except IndexError: + assert len(_opcode_instances) == n + _opcode_instances.append(super(CScriptOp, cls).__new__(cls, n)) + return _opcode_instances[n] + +# Populate opcode instance table +for n in range(0xff+1): + CScriptOp(n) + + +# push value +OP_0 = CScriptOp(0x00) +OP_FALSE = OP_0 +OP_PUSHDATA1 = CScriptOp(0x4c) +OP_PUSHDATA2 = CScriptOp(0x4d) +OP_PUSHDATA4 = CScriptOp(0x4e) +OP_1NEGATE = CScriptOp(0x4f) +OP_RESERVED = CScriptOp(0x50) +OP_1 = CScriptOp(0x51) +OP_TRUE=OP_1 +OP_2 = CScriptOp(0x52) +OP_3 = CScriptOp(0x53) +OP_4 = CScriptOp(0x54) +OP_5 = CScriptOp(0x55) +OP_6 = CScriptOp(0x56) +OP_7 = CScriptOp(0x57) +OP_8 = CScriptOp(0x58) +OP_9 = CScriptOp(0x59) +OP_10 = CScriptOp(0x5a) +OP_11 = CScriptOp(0x5b) +OP_12 = CScriptOp(0x5c) +OP_13 = CScriptOp(0x5d) +OP_14 = CScriptOp(0x5e) +OP_15 = CScriptOp(0x5f) +OP_16 = CScriptOp(0x60) + +# control +OP_NOP = CScriptOp(0x61) +OP_VER = CScriptOp(0x62) +OP_IF = CScriptOp(0x63) +OP_NOTIF = CScriptOp(0x64) +OP_VERIF = CScriptOp(0x65) +OP_VERNOTIF = CScriptOp(0x66) +OP_ELSE = CScriptOp(0x67) +OP_ENDIF = CScriptOp(0x68) +OP_VERIFY = CScriptOp(0x69) +OP_RETURN = CScriptOp(0x6a) + +# stack ops +OP_TOALTSTACK = CScriptOp(0x6b) +OP_FROMALTSTACK = CScriptOp(0x6c) +OP_2DROP = CScriptOp(0x6d) +OP_2DUP = CScriptOp(0x6e) +OP_3DUP = CScriptOp(0x6f) +OP_2OVER = CScriptOp(0x70) +OP_2ROT = CScriptOp(0x71) +OP_2SWAP = CScriptOp(0x72) +OP_IFDUP = CScriptOp(0x73) +OP_DEPTH = CScriptOp(0x74) +OP_DROP = CScriptOp(0x75) +OP_DUP = CScriptOp(0x76) +OP_NIP = CScriptOp(0x77) +OP_OVER = CScriptOp(0x78) +OP_PICK = CScriptOp(0x79) +OP_ROLL = CScriptOp(0x7a) +OP_ROT = CScriptOp(0x7b) +OP_SWAP = CScriptOp(0x7c) +OP_TUCK = CScriptOp(0x7d) + +# splice ops +OP_CAT = CScriptOp(0x7e) +OP_SUBSTR = CScriptOp(0x7f) +OP_LEFT = CScriptOp(0x80) +OP_RIGHT = CScriptOp(0x81) +OP_SIZE = CScriptOp(0x82) + +# bit logic +OP_INVERT = CScriptOp(0x83) +OP_AND = CScriptOp(0x84) +OP_OR = CScriptOp(0x85) +OP_XOR = CScriptOp(0x86) +OP_EQUAL = CScriptOp(0x87) +OP_EQUALVERIFY = CScriptOp(0x88) +OP_RESERVED1 = CScriptOp(0x89) +OP_RESERVED2 = CScriptOp(0x8a) + +# numeric +OP_1ADD = CScriptOp(0x8b) +OP_1SUB = CScriptOp(0x8c) +OP_2MUL = CScriptOp(0x8d) +OP_2DIV = CScriptOp(0x8e) +OP_NEGATE = CScriptOp(0x8f) +OP_ABS = CScriptOp(0x90) +OP_NOT = CScriptOp(0x91) +OP_0NOTEQUAL = CScriptOp(0x92) + +OP_ADD = CScriptOp(0x93) +OP_SUB = CScriptOp(0x94) +OP_MUL = CScriptOp(0x95) +OP_DIV = CScriptOp(0x96) +OP_MOD = CScriptOp(0x97) +OP_LSHIFT = CScriptOp(0x98) +OP_RSHIFT = CScriptOp(0x99) + +OP_BOOLAND = CScriptOp(0x9a) +OP_BOOLOR = CScriptOp(0x9b) +OP_NUMEQUAL = CScriptOp(0x9c) +OP_NUMEQUALVERIFY = CScriptOp(0x9d) +OP_NUMNOTEQUAL = CScriptOp(0x9e) +OP_LESSTHAN = CScriptOp(0x9f) +OP_GREATERTHAN = CScriptOp(0xa0) +OP_LESSTHANOREQUAL = CScriptOp(0xa1) +OP_GREATERTHANOREQUAL = CScriptOp(0xa2) +OP_MIN = CScriptOp(0xa3) +OP_MAX = CScriptOp(0xa4) + +OP_WITHIN = CScriptOp(0xa5) + +# crypto +OP_RIPEMD160 = CScriptOp(0xa6) +OP_SHA1 = CScriptOp(0xa7) +OP_SHA256 = CScriptOp(0xa8) +OP_HASH160 = CScriptOp(0xa9) +OP_HASH256 = CScriptOp(0xaa) +OP_CODESEPARATOR = CScriptOp(0xab) +OP_CHECKSIG = CScriptOp(0xac) +OP_CHECKSIGVERIFY = CScriptOp(0xad) +OP_CHECKMULTISIG = CScriptOp(0xae) +OP_CHECKMULTISIGVERIFY = CScriptOp(0xaf) + +# expansion +OP_NOP1 = CScriptOp(0xb0) +OP_NOP2 = CScriptOp(0xb1) +OP_NOP3 = CScriptOp(0xb2) +OP_NOP4 = CScriptOp(0xb3) +OP_NOP5 = CScriptOp(0xb4) +OP_NOP6 = CScriptOp(0xb5) +OP_NOP7 = CScriptOp(0xb6) +OP_NOP8 = CScriptOp(0xb7) +OP_NOP9 = CScriptOp(0xb8) +OP_NOP10 = CScriptOp(0xb9) + +# template matching params +OP_SMALLINTEGER = CScriptOp(0xfa) +OP_PUBKEYS = CScriptOp(0xfb) +OP_PUBKEYHASH = CScriptOp(0xfd) +OP_PUBKEY = CScriptOp(0xfe) + +OP_INVALIDOPCODE = CScriptOp(0xff) + +VALID_OPCODES = { + OP_1NEGATE, + OP_RESERVED, + OP_1, + OP_2, + OP_3, + OP_4, + OP_5, + OP_6, + OP_7, + OP_8, + OP_9, + OP_10, + OP_11, + OP_12, + OP_13, + OP_14, + OP_15, + OP_16, + + OP_NOP, + OP_VER, + OP_IF, + OP_NOTIF, + OP_VERIF, + OP_VERNOTIF, + OP_ELSE, + OP_ENDIF, + OP_VERIFY, + OP_RETURN, + + OP_TOALTSTACK, + OP_FROMALTSTACK, + OP_2DROP, + OP_2DUP, + OP_3DUP, + OP_2OVER, + OP_2ROT, + OP_2SWAP, + OP_IFDUP, + OP_DEPTH, + OP_DROP, + OP_DUP, + OP_NIP, + OP_OVER, + OP_PICK, + OP_ROLL, + OP_ROT, + OP_SWAP, + OP_TUCK, + + OP_CAT, + OP_SUBSTR, + OP_LEFT, + OP_RIGHT, + OP_SIZE, + + OP_INVERT, + OP_AND, + OP_OR, + OP_XOR, + OP_EQUAL, + OP_EQUALVERIFY, + OP_RESERVED1, + OP_RESERVED2, + + OP_1ADD, + OP_1SUB, + OP_2MUL, + OP_2DIV, + OP_NEGATE, + OP_ABS, + OP_NOT, + OP_0NOTEQUAL, + + OP_ADD, + OP_SUB, + OP_MUL, + OP_DIV, + OP_MOD, + OP_LSHIFT, + OP_RSHIFT, + + OP_BOOLAND, + OP_BOOLOR, + OP_NUMEQUAL, + OP_NUMEQUALVERIFY, + OP_NUMNOTEQUAL, + OP_LESSTHAN, + OP_GREATERTHAN, + OP_LESSTHANOREQUAL, + OP_GREATERTHANOREQUAL, + OP_MIN, + OP_MAX, + + OP_WITHIN, + + OP_RIPEMD160, + OP_SHA1, + OP_SHA256, + OP_HASH160, + OP_HASH256, + OP_CODESEPARATOR, + OP_CHECKSIG, + OP_CHECKSIGVERIFY, + OP_CHECKMULTISIG, + OP_CHECKMULTISIGVERIFY, + + OP_NOP1, + OP_NOP2, + OP_NOP3, + OP_NOP4, + OP_NOP5, + OP_NOP6, + OP_NOP7, + OP_NOP8, + OP_NOP9, + OP_NOP10, + + OP_SMALLINTEGER, + OP_PUBKEYS, + OP_PUBKEYHASH, + OP_PUBKEY, +} + +OPCODE_NAMES.update({ + OP_0 : 'OP_0', + OP_PUSHDATA1 : 'OP_PUSHDATA1', + OP_PUSHDATA2 : 'OP_PUSHDATA2', + OP_PUSHDATA4 : 'OP_PUSHDATA4', + OP_1NEGATE : 'OP_1NEGATE', + OP_RESERVED : 'OP_RESERVED', + OP_1 : 'OP_1', + OP_2 : 'OP_2', + OP_3 : 'OP_3', + OP_4 : 'OP_4', + OP_5 : 'OP_5', + OP_6 : 'OP_6', + OP_7 : 'OP_7', + OP_8 : 'OP_8', + OP_9 : 'OP_9', + OP_10 : 'OP_10', + OP_11 : 'OP_11', + OP_12 : 'OP_12', + OP_13 : 'OP_13', + OP_14 : 'OP_14', + OP_15 : 'OP_15', + OP_16 : 'OP_16', + OP_NOP : 'OP_NOP', + OP_VER : 'OP_VER', + OP_IF : 'OP_IF', + OP_NOTIF : 'OP_NOTIF', + OP_VERIF : 'OP_VERIF', + OP_VERNOTIF : 'OP_VERNOTIF', + OP_ELSE : 'OP_ELSE', + OP_ENDIF : 'OP_ENDIF', + OP_VERIFY : 'OP_VERIFY', + OP_RETURN : 'OP_RETURN', + OP_TOALTSTACK : 'OP_TOALTSTACK', + OP_FROMALTSTACK : 'OP_FROMALTSTACK', + OP_2DROP : 'OP_2DROP', + OP_2DUP : 'OP_2DUP', + OP_3DUP : 'OP_3DUP', + OP_2OVER : 'OP_2OVER', + OP_2ROT : 'OP_2ROT', + OP_2SWAP : 'OP_2SWAP', + OP_IFDUP : 'OP_IFDUP', + OP_DEPTH : 'OP_DEPTH', + OP_DROP : 'OP_DROP', + OP_DUP : 'OP_DUP', + OP_NIP : 'OP_NIP', + OP_OVER : 'OP_OVER', + OP_PICK : 'OP_PICK', + OP_ROLL : 'OP_ROLL', + OP_ROT : 'OP_ROT', + OP_SWAP : 'OP_SWAP', + OP_TUCK : 'OP_TUCK', + OP_CAT : 'OP_CAT', + OP_SUBSTR : 'OP_SUBSTR', + OP_LEFT : 'OP_LEFT', + OP_RIGHT : 'OP_RIGHT', + OP_SIZE : 'OP_SIZE', + OP_INVERT : 'OP_INVERT', + OP_AND : 'OP_AND', + OP_OR : 'OP_OR', + OP_XOR : 'OP_XOR', + OP_EQUAL : 'OP_EQUAL', + OP_EQUALVERIFY : 'OP_EQUALVERIFY', + OP_RESERVED1 : 'OP_RESERVED1', + OP_RESERVED2 : 'OP_RESERVED2', + OP_1ADD : 'OP_1ADD', + OP_1SUB : 'OP_1SUB', + OP_2MUL : 'OP_2MUL', + OP_2DIV : 'OP_2DIV', + OP_NEGATE : 'OP_NEGATE', + OP_ABS : 'OP_ABS', + OP_NOT : 'OP_NOT', + OP_0NOTEQUAL : 'OP_0NOTEQUAL', + OP_ADD : 'OP_ADD', + OP_SUB : 'OP_SUB', + OP_MUL : 'OP_MUL', + OP_DIV : 'OP_DIV', + OP_MOD : 'OP_MOD', + OP_LSHIFT : 'OP_LSHIFT', + OP_RSHIFT : 'OP_RSHIFT', + OP_BOOLAND : 'OP_BOOLAND', + OP_BOOLOR : 'OP_BOOLOR', + OP_NUMEQUAL : 'OP_NUMEQUAL', + OP_NUMEQUALVERIFY : 'OP_NUMEQUALVERIFY', + OP_NUMNOTEQUAL : 'OP_NUMNOTEQUAL', + OP_LESSTHAN : 'OP_LESSTHAN', + OP_GREATERTHAN : 'OP_GREATERTHAN', + OP_LESSTHANOREQUAL : 'OP_LESSTHANOREQUAL', + OP_GREATERTHANOREQUAL : 'OP_GREATERTHANOREQUAL', + OP_MIN : 'OP_MIN', + OP_MAX : 'OP_MAX', + OP_WITHIN : 'OP_WITHIN', + OP_RIPEMD160 : 'OP_RIPEMD160', + OP_SHA1 : 'OP_SHA1', + OP_SHA256 : 'OP_SHA256', + OP_HASH160 : 'OP_HASH160', + OP_HASH256 : 'OP_HASH256', + OP_CODESEPARATOR : 'OP_CODESEPARATOR', + OP_CHECKSIG : 'OP_CHECKSIG', + OP_CHECKSIGVERIFY : 'OP_CHECKSIGVERIFY', + OP_CHECKMULTISIG : 'OP_CHECKMULTISIG', + OP_CHECKMULTISIGVERIFY : 'OP_CHECKMULTISIGVERIFY', + OP_NOP1 : 'OP_NOP1', + OP_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', + 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_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(bignum.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) |