Hush Full Node software. We were censored from Github, this is where all development happens now.
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634 lines
19 KiB
634 lines
19 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin Core developers
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// Distributed under the GPLv3 software license, see the accompanying
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// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
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/******************************************************************************
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* Copyright © 2014-2019 The SuperNET Developers. *
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* *
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* See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at *
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* the top-level directory of this distribution for the individual copyright *
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* holder information and the developer policies on copyright and licensing. *
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* *
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* Unless otherwise agreed in a custom licensing agreement, no part of the *
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* SuperNET software, including this file may be copied, modified, propagated *
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* or distributed except according to the terms contained in the LICENSE file *
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* *
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* Removal or modification of this copyright notice is prohibited. *
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* *
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******************************************************************************/
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#ifndef BITCOIN_SCRIPT_SCRIPT_H
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#define BITCOIN_SCRIPT_SCRIPT_H
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#include "crypto/common.h"
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#include "prevector.h"
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#include <assert.h>
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#include <climits>
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#include <limits>
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#include <stdexcept>
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#include <stdint.h>
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#include <string.h>
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#include <string>
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#include <vector>
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#define OPRETTYPE_TIMELOCK 1
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#define OPRETTYPE_STAKEPARAMS 2
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#define OPRETTYPE_STAKECHEAT 3
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static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes
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// Max size of pushdata in a CC sig in bytes
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static const unsigned int MAX_SCRIPT_CRYPTOCONDITION_FULFILLMENT_SIZE = 2048;
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// Maximum script length in bytes
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static const int MAX_SCRIPT_SIZE = 10000;
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// Threshold for nLockTime: below this value it is interpreted as block number,
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// otherwise as UNIX timestamp.
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static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
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template <typename T>
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std::vector<unsigned char> ToByteVector(const T& in)
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{
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return std::vector<unsigned char>(in.begin(), in.end());
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}
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/** Script opcodes */
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enum opcodetype
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{
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// push value
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OP_0 = 0x00,
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OP_FALSE = OP_0,
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OP_PUSHDATA1 = 0x4c,
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OP_PUSHDATA2 = 0x4d,
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OP_PUSHDATA4 = 0x4e,
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OP_1NEGATE = 0x4f,
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OP_RESERVED = 0x50,
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OP_1 = 0x51,
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OP_TRUE=OP_1,
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OP_2 = 0x52,
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OP_3 = 0x53,
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OP_4 = 0x54,
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OP_5 = 0x55,
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OP_6 = 0x56,
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OP_7 = 0x57,
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OP_8 = 0x58,
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OP_9 = 0x59,
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OP_10 = 0x5a,
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OP_11 = 0x5b,
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OP_12 = 0x5c,
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OP_13 = 0x5d,
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OP_14 = 0x5e,
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OP_15 = 0x5f,
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OP_16 = 0x60,
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// control
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OP_NOP = 0x61,
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OP_VER = 0x62,
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OP_IF = 0x63,
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OP_NOTIF = 0x64,
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OP_VERIF = 0x65,
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OP_VERNOTIF = 0x66,
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OP_ELSE = 0x67,
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OP_ENDIF = 0x68,
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OP_VERIFY = 0x69,
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OP_RETURN = 0x6a,
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// stack ops
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OP_TOALTSTACK = 0x6b,
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OP_FROMALTSTACK = 0x6c,
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OP_2DROP = 0x6d,
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OP_2DUP = 0x6e,
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OP_3DUP = 0x6f,
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OP_2OVER = 0x70,
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OP_2ROT = 0x71,
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OP_2SWAP = 0x72,
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OP_IFDUP = 0x73,
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OP_DEPTH = 0x74,
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OP_DROP = 0x75,
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OP_DUP = 0x76,
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OP_NIP = 0x77,
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OP_OVER = 0x78,
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OP_PICK = 0x79,
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OP_ROLL = 0x7a,
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OP_ROT = 0x7b,
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OP_SWAP = 0x7c,
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OP_TUCK = 0x7d,
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// splice ops
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OP_CAT = 0x7e,
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OP_SUBSTR = 0x7f,
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OP_LEFT = 0x80,
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OP_RIGHT = 0x81,
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OP_SIZE = 0x82,
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// bit logic
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OP_INVERT = 0x83,
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OP_AND = 0x84,
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OP_OR = 0x85,
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OP_XOR = 0x86,
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OP_EQUAL = 0x87,
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OP_EQUALVERIFY = 0x88,
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OP_RESERVED1 = 0x89,
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OP_RESERVED2 = 0x8a,
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// numeric
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OP_1ADD = 0x8b,
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OP_1SUB = 0x8c,
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OP_2MUL = 0x8d,
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OP_2DIV = 0x8e,
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OP_NEGATE = 0x8f,
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OP_ABS = 0x90,
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OP_NOT = 0x91,
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OP_0NOTEQUAL = 0x92,
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OP_ADD = 0x93,
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OP_SUB = 0x94,
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OP_MUL = 0x95,
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OP_DIV = 0x96,
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OP_MOD = 0x97,
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OP_LSHIFT = 0x98,
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OP_RSHIFT = 0x99,
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OP_BOOLAND = 0x9a,
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OP_BOOLOR = 0x9b,
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OP_NUMEQUAL = 0x9c,
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OP_NUMEQUALVERIFY = 0x9d,
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OP_NUMNOTEQUAL = 0x9e,
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OP_LESSTHAN = 0x9f,
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OP_GREATERTHAN = 0xa0,
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OP_LESSTHANOREQUAL = 0xa1,
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OP_GREATERTHANOREQUAL = 0xa2,
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OP_MIN = 0xa3,
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OP_MAX = 0xa4,
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OP_WITHIN = 0xa5,
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// crypto
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OP_RIPEMD160 = 0xa6,
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OP_SHA1 = 0xa7,
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OP_SHA256 = 0xa8,
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OP_HASH160 = 0xa9,
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OP_HASH256 = 0xaa,
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OP_CODESEPARATOR = 0xab,
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OP_CHECKSIG = 0xac,
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OP_CHECKSIGVERIFY = 0xad,
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OP_CHECKMULTISIG = 0xae,
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OP_CHECKMULTISIGVERIFY = 0xaf,
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OP_CHECKCRYPTOCONDITION = 0xcc,
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OP_CHECKCRYPTOCONDITIONVERIFY = 0xcd,
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// expansion
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OP_NOP1 = 0xb0,
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OP_NOP2 = 0xb1,
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OP_CHECKLOCKTIMEVERIFY = OP_NOP2,
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OP_NOP3 = 0xb2,
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OP_NOP4 = 0xb3,
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OP_NOP5 = 0xb4,
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OP_NOP6 = 0xb5,
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OP_NOP7 = 0xb6,
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OP_NOP8 = 0xb7,
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OP_NOP9 = 0xb8,
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OP_NOP10 = 0xb9,
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// template matching params
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OP_SMALLDATA = 0xf9,
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OP_SMALLINTEGER = 0xfa,
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OP_PUBKEYS = 0xfb,
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OP_PUBKEYHASH = 0xfd,
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OP_PUBKEY = 0xfe,
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OP_CRYPTOCONDITION = 0xfc,
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OP_INVALIDOPCODE = 0xff,
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};
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const char* GetOpName(opcodetype opcode);
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class scriptnum_error : public std::runtime_error
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{
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public:
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explicit scriptnum_error(const std::string& str) : std::runtime_error(str) {}
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};
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class CScriptNum
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{
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/**
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* Numeric opcodes (OP_1ADD, etc) are restricted to operating on 4-byte integers.
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* The semantics are subtle, though: operands must be in the range [-2^31 +1...2^31 -1],
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* but results may overflow (and are valid as long as they are not used in a subsequent
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* numeric operation). CScriptNum enforces those semantics by storing results as
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* an int64 and allowing out-of-range values to be returned as a vector of bytes but
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* throwing an exception if arithmetic is done or the result is interpreted as an integer.
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*/
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public:
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explicit CScriptNum(const int64_t& n)
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{
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m_value = n;
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}
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static const size_t nDefaultMaxNumSize = 4;
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explicit CScriptNum(const std::vector<unsigned char>& vch, bool fRequireMinimal,
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const size_t nMaxNumSize = nDefaultMaxNumSize)
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{
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if (vch.size() > nMaxNumSize) {
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throw scriptnum_error("script number overflow");
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}
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if (fRequireMinimal && vch.size() > 0) {
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// Check that the number is encoded with the minimum possible
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// number of bytes.
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//
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// If the most-significant-byte - excluding the sign bit - is zero
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// then we're not minimal. Note how this test also rejects the
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// negative-zero encoding, 0x80.
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if ((vch.back() & 0x7f) == 0) {
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// One exception: if there's more than one byte and the most
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// significant bit of the second-most-significant-byte is set
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// it would conflict with the sign bit. An example of this case
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// is +-255, which encode to 0xff00 and 0xff80 respectively.
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// (big-endian).
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if (vch.size() <= 1 || (vch[vch.size() - 2] & 0x80) == 0) {
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throw scriptnum_error("non-minimally encoded script number");
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}
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}
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}
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m_value = set_vch(vch);
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}
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inline bool operator==(const int64_t& rhs) const { return m_value == rhs; }
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inline bool operator!=(const int64_t& rhs) const { return m_value != rhs; }
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inline bool operator<=(const int64_t& rhs) const { return m_value <= rhs; }
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inline bool operator< (const int64_t& rhs) const { return m_value < rhs; }
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inline bool operator>=(const int64_t& rhs) const { return m_value >= rhs; }
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inline bool operator> (const int64_t& rhs) const { return m_value > rhs; }
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inline bool operator==(const CScriptNum& rhs) const { return operator==(rhs.m_value); }
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inline bool operator!=(const CScriptNum& rhs) const { return operator!=(rhs.m_value); }
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inline bool operator<=(const CScriptNum& rhs) const { return operator<=(rhs.m_value); }
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inline bool operator< (const CScriptNum& rhs) const { return operator< (rhs.m_value); }
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inline bool operator>=(const CScriptNum& rhs) const { return operator>=(rhs.m_value); }
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inline bool operator> (const CScriptNum& rhs) const { return operator> (rhs.m_value); }
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inline CScriptNum operator+( const int64_t& rhs) const { return CScriptNum(m_value + rhs);}
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inline CScriptNum operator-( const int64_t& rhs) const { return CScriptNum(m_value - rhs);}
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inline CScriptNum operator+( const CScriptNum& rhs) const { return operator+(rhs.m_value); }
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inline CScriptNum operator-( const CScriptNum& rhs) const { return operator-(rhs.m_value); }
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inline CScriptNum& operator+=( const CScriptNum& rhs) { return operator+=(rhs.m_value); }
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inline CScriptNum& operator-=( const CScriptNum& rhs) { return operator-=(rhs.m_value); }
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inline CScriptNum operator-() const
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{
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assert(m_value != std::numeric_limits<int64_t>::min());
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return CScriptNum(-m_value);
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}
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inline CScriptNum& operator=( const int64_t& rhs)
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{
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m_value = rhs;
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return *this;
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}
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inline CScriptNum& operator+=( const int64_t& rhs)
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{
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assert(rhs == 0 || (rhs > 0 && m_value <= std::numeric_limits<int64_t>::max() - rhs) ||
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(rhs < 0 && m_value >= std::numeric_limits<int64_t>::min() - rhs));
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m_value += rhs;
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return *this;
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}
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inline CScriptNum& operator-=( const int64_t& rhs)
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{
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assert(rhs == 0 || (rhs > 0 && m_value >= std::numeric_limits<int64_t>::min() + rhs) ||
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(rhs < 0 && m_value <= std::numeric_limits<int64_t>::max() + rhs));
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m_value -= rhs;
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return *this;
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}
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int getint() const
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{
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if (m_value > std::numeric_limits<int>::max())
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return std::numeric_limits<int>::max();
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else if (m_value < std::numeric_limits<int>::min())
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return std::numeric_limits<int>::min();
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return m_value;
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}
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std::vector<unsigned char> getvch() const
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{
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return serialize(m_value);
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}
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static std::vector<unsigned char> serialize(const int64_t& value)
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{
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if(value == 0)
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return std::vector<unsigned char>();
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std::vector<unsigned char> result;
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const bool neg = value < 0;
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uint64_t absvalue = neg ? -value : value;
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while(absvalue)
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{
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result.push_back(absvalue & 0xff);
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absvalue >>= 8;
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}
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// - If the most significant byte is >= 0x80 and the value is positive, push a
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// new zero-byte to make the significant byte < 0x80 again.
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// - If the most significant byte is >= 0x80 and the value is negative, push a
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// new 0x80 byte that will be popped off when converting to an integral.
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// - If the most significant byte is < 0x80 and the value is negative, add
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// 0x80 to it, since it will be subtracted and interpreted as a negative when
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// converting to an integral.
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if (result.back() & 0x80)
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result.push_back(neg ? 0x80 : 0);
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else if (neg)
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result.back() |= 0x80;
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return result;
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}
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private:
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static int64_t set_vch(const std::vector<unsigned char>& vch)
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{
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if (vch.empty())
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return 0;
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int64_t result = 0;
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for (size_t i = 0; i != vch.size(); ++i)
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result |= static_cast<int64_t>(vch[i]) << 8*i;
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// If the input vector's most significant byte is 0x80, remove it from
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// the result's msb and return a negative.
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if (vch.back() & 0x80)
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return -((int64_t)(result & ~(0x80ULL << (8 * (vch.size() - 1)))));
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return result;
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}
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int64_t m_value;
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};
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typedef prevector<28, unsigned char> CScriptBase;
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/** Serialized script, used inside transaction inputs and outputs */
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class CScript : public CScriptBase
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{
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protected:
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CScript& push_int64(int64_t n)
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{
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if (n == -1 || (n >= 1 && n <= 16))
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{
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push_back(n + (OP_1 - 1));
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}
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else if (n == 0)
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{
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push_back(OP_0);
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}
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else
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{
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*this << CScriptNum::serialize(n);
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}
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return *this;
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}
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bool GetBalancedData(const_iterator& pc, std::vector<std::vector<unsigned char>>& vSolutions) const;
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public:
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CScript() { }
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CScript(const CScript& b) : CScriptBase(b.begin(), b.end()) { }
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CScript(const_iterator pbegin, const_iterator pend) : CScriptBase(pbegin, pend) { }
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CScript(std::vector<unsigned char>::const_iterator pbegin, std::vector<unsigned char>::const_iterator pend) : CScriptBase(pbegin, pend) { }
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CScript(const unsigned char* pbegin, const unsigned char* pend) : CScriptBase(pbegin, pend) { }
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CScript& operator+=(const CScript& b)
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{
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insert(end(), b.begin(), b.end());
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return *this;
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}
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friend CScript operator+(const CScript& a, const CScript& b)
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{
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CScript ret = a;
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ret += b;
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return ret;
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}
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CScript(int64_t b) { operator<<(b); }
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explicit CScript(opcodetype b) { operator<<(b); }
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explicit CScript(const CScriptNum& b) { operator<<(b); }
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explicit CScript(const std::vector<unsigned char>& b) { operator<<(b); }
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CScript& operator<<(int64_t b) { return push_int64(b); }
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CScript& operator<<(opcodetype opcode)
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{
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if (opcode < 0 || opcode > 0xff)
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throw std::runtime_error("CScript::operator<<(): invalid opcode");
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insert(end(), (unsigned char)opcode);
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return *this;
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}
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CScript& operator<<(const CScriptNum& b)
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{
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*this << b.getvch();
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return *this;
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}
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CScript& operator<<(const std::vector<unsigned char>& b)
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{
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if (b.size() < OP_PUSHDATA1)
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{
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insert(end(), (unsigned char)b.size());
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}
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else if (b.size() <= 0xff)
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{
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insert(end(), OP_PUSHDATA1);
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insert(end(), (unsigned char)b.size());
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}
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else if (b.size() <= 0xffff)
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{
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insert(end(), OP_PUSHDATA2);
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uint8_t data[2];
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WriteLE16(data, b.size());
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insert(end(), data, data + sizeof(data));
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}
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else
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{
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insert(end(), OP_PUSHDATA4);
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uint8_t data[4];
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WriteLE32(data, b.size());
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insert(end(), data, data + sizeof(data));
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}
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insert(end(), b.begin(), b.end());
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return *this;
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}
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CScript& operator<<(const CScript& b)
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{
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// I'm not sure if this should push the script or concatenate scripts.
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// If there's ever a use for pushing a script onto a script, delete this member fn
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assert(!"Warning: Pushing a CScript onto a CScript with << is probably not intended, use + to concatenate!");
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return *this;
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}
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bool GetOp(iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet)
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{
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// Wrapper so it can be called with either iterator or const_iterator
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const_iterator pc2 = pc;
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bool fRet = GetOp2(pc2, opcodeRet, &vchRet);
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pc = begin() + (pc2 - begin());
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return fRet;
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}
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bool GetOp(iterator& pc, opcodetype& opcodeRet)
|
|
{
|
|
const_iterator pc2 = pc;
|
|
bool fRet = GetOp2(pc2, opcodeRet, NULL);
|
|
pc = begin() + (pc2 - begin());
|
|
return fRet;
|
|
}
|
|
|
|
bool GetOp(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet) const
|
|
{
|
|
return GetOp2(pc, opcodeRet, &vchRet);
|
|
}
|
|
|
|
bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
|
|
{
|
|
return GetOp2(pc, opcodeRet, NULL);
|
|
}
|
|
|
|
bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
|
|
{
|
|
opcodeRet = OP_INVALIDOPCODE;
|
|
if (pvchRet)
|
|
pvchRet->clear();
|
|
if (pc >= end())
|
|
return false;
|
|
|
|
// Read instruction
|
|
if (end() - pc < 1)
|
|
return false;
|
|
unsigned int opcode = *pc++;
|
|
|
|
// Immediate operand
|
|
if (opcode <= OP_PUSHDATA4)
|
|
{
|
|
unsigned int nSize = 0;
|
|
if (opcode < OP_PUSHDATA1)
|
|
{
|
|
nSize = opcode;
|
|
}
|
|
else if (opcode == OP_PUSHDATA1)
|
|
{
|
|
if (end() - pc < 1)
|
|
return false;
|
|
nSize = *pc++;
|
|
}
|
|
else if (opcode == OP_PUSHDATA2)
|
|
{
|
|
if (end() - pc < 2)
|
|
return false;
|
|
nSize = ReadLE16(&pc[0]);
|
|
pc += 2;
|
|
}
|
|
else if (opcode == OP_PUSHDATA4)
|
|
{
|
|
if (end() - pc < 4)
|
|
return false;
|
|
nSize = ReadLE32(&pc[0]);
|
|
pc += 4;
|
|
}
|
|
if (end() - pc < 0 || (unsigned int)(end() - pc) < nSize)
|
|
return false;
|
|
if (pvchRet)
|
|
pvchRet->assign(pc, pc + nSize);
|
|
pc += nSize;
|
|
}
|
|
|
|
opcodeRet = (opcodetype)opcode;
|
|
return true;
|
|
}
|
|
|
|
/** Encode/decode small integers: */
|
|
static int DecodeOP_N(opcodetype opcode)
|
|
{
|
|
if (opcode == OP_0)
|
|
return 0;
|
|
assert(opcode >= OP_1 && opcode <= OP_16);
|
|
return (int)opcode - (int)(OP_1 - 1);
|
|
}
|
|
static opcodetype EncodeOP_N(int n)
|
|
{
|
|
assert(n >= 0 && n <= 16);
|
|
if (n == 0)
|
|
return OP_0;
|
|
return (opcodetype)(OP_1+n-1);
|
|
}
|
|
|
|
/**
|
|
* Pre-version-0.6, Bitcoin always counted CHECKMULTISIGs
|
|
* as 20 sigops. With pay-to-script-hash, that changed:
|
|
* CHECKMULTISIGs serialized in scriptSigs are
|
|
* counted more accurately, assuming they are of the form
|
|
* ... OP_N CHECKMULTISIG ...
|
|
*/
|
|
unsigned int GetSigOpCount(bool fAccurate) const;
|
|
|
|
/**
|
|
* Accurately count sigOps, including sigOps in
|
|
* pay-to-script-hash transactions:
|
|
*/
|
|
unsigned int GetSigOpCount(const CScript& scriptSig) const;
|
|
|
|
bool IsPayToPublicKeyHash() const;
|
|
bool IsPayToPublicKey() const;
|
|
|
|
bool IsPayToScriptHash() const;
|
|
bool GetPushedData(CScript::const_iterator pc, std::vector<std::vector<unsigned char>>& vData) const;
|
|
bool IsOpReturn() const { return size() > 0 && (*this)[0] == OP_RETURN; }
|
|
bool GetOpretData(std::vector<std::vector<unsigned char>>& vData) const;
|
|
|
|
bool IsPayToCryptoCondition(CScript *ccSubScript, std::vector<std::vector<unsigned char>>& vSolutions) const;
|
|
bool IsPayToCryptoCondition(CScript *ccSubScript) const;
|
|
bool IsPayToCryptoCondition() const;
|
|
bool IsCoinImport() const;
|
|
bool MayAcceptCryptoCondition() const;
|
|
|
|
/** Called by IsStandardTx and P2SH/BIP62 VerifyScript (which makes it consensus-critical). */
|
|
bool IsPushOnly() const;
|
|
|
|
/** if the front of the script has check lock time verify. this is a fairly simple check.
|
|
* accepts NULL as parameter if unlockTime is not needed.
|
|
*/
|
|
bool IsCheckLockTimeVerify(int64_t *unlockTime) const;
|
|
|
|
bool IsCheckLockTimeVerify() const;
|
|
|
|
/**
|
|
* Returns whether the script is guaranteed to fail at execution,
|
|
* regardless of the initial stack. This allows outputs to be pruned
|
|
* instantly when entering the UTXO set.
|
|
*/
|
|
bool IsUnspendable() const
|
|
{
|
|
return (size() > 0 && *begin() == OP_RETURN) || (size() > MAX_SCRIPT_SIZE);
|
|
}
|
|
|
|
std::string ToString() const;
|
|
|
|
void clear()
|
|
{
|
|
// The default std::vector::clear() does not release memory.
|
|
CScriptBase().swap(*this);
|
|
}
|
|
};
|
|
|
|
#endif // BITCOIN_SCRIPT_SCRIPT_H
|
|
|