695 lines
20 KiB
C++
695 lines
20 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2013 The Bitcoin developers
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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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#ifndef H_BITCOIN_SCRIPT
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#define H_BITCOIN_SCRIPT
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#include "bignum.h"
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#include "key.h"
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#include "util.h"
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#include <stdexcept>
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include <boost/foreach.hpp>
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#include <boost/variant.hpp>
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class CCoins;
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class CKeyStore;
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class CTransaction;
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static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes
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static const unsigned int MAX_OP_RETURN_RELAY = 40; // bytes
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/** Signature hash types/flags */
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enum
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{
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SIGHASH_ALL = 1,
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SIGHASH_NONE = 2,
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SIGHASH_SINGLE = 3,
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SIGHASH_ANYONECANPAY = 0x80,
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};
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/** Script verification flags */
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enum
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{
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SCRIPT_VERIFY_NONE = 0,
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SCRIPT_VERIFY_P2SH = (1U << 0), // evaluate P2SH (BIP16) subscripts
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SCRIPT_VERIFY_STRICTENC = (1U << 1), // enforce strict conformance to DER and SEC2 for signatures and pubkeys
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SCRIPT_VERIFY_EVEN_S = (1U << 2), // enforce even S values in signatures (depends on STRICTENC)
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SCRIPT_VERIFY_NOCACHE = (1U << 3), // do not store results in signature cache (but do query it)
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};
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enum txnouttype
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{
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TX_NONSTANDARD,
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// 'standard' transaction types:
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TX_PUBKEY,
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TX_PUBKEYHASH,
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TX_SCRIPTHASH,
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TX_MULTISIG,
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TX_NULL_DATA,
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};
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class CNoDestination {
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public:
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friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
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friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
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};
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/** A txout script template with a specific destination. It is either:
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* * CNoDestination: no destination set
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* * CKeyID: TX_PUBKEYHASH destination
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* * CScriptID: TX_SCRIPTHASH destination
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* A CTxDestination is the internal data type encoded in a CBitcoinAddress
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*/
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typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
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const char* GetTxnOutputType(txnouttype t);
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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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// expansion
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OP_NOP1 = 0xb0,
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OP_NOP2 = 0xb1,
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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_INVALIDOPCODE = 0xff,
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};
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const char* GetOpName(opcodetype opcode);
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inline std::string ValueString(const std::vector<unsigned char>& vch)
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{
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if (vch.size() <= 4)
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return strprintf("%d", CBigNum(vch).getint());
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else
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return HexStr(vch);
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}
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inline std::string StackString(const std::vector<std::vector<unsigned char> >& vStack)
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{
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std::string str;
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BOOST_FOREACH(const std::vector<unsigned char>& vch, vStack)
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{
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if (!str.empty())
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str += " ";
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str += ValueString(vch);
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}
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return str;
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}
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/** Serialized script, used inside transaction inputs and outputs */
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class CScript : public std::vector<unsigned char>
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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
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{
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CBigNum bn(n);
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*this << bn.getvch();
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}
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return *this;
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}
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CScript& push_uint64(uint64_t n)
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{
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if (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
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{
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CBigNum bn(n);
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*this << bn.getvch();
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}
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return *this;
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}
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public:
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CScript() { }
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CScript(const CScript& b) : std::vector<unsigned char>(b.begin(), b.end()) { }
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CScript(const_iterator pbegin, const_iterator pend) : std::vector<unsigned char>(pbegin, pend) { }
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#ifndef _MSC_VER
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CScript(const unsigned char* pbegin, const unsigned char* pend) : std::vector<unsigned char>(pbegin, pend) { }
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#endif
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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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//explicit CScript(char b) is not portable. Use 'signed char' or 'unsigned char'.
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explicit CScript(signed char b) { operator<<(b); }
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explicit CScript(short b) { operator<<(b); }
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explicit CScript(int b) { operator<<(b); }
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explicit CScript(long b) { operator<<(b); }
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explicit CScript(long long b) { operator<<(b); }
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explicit CScript(unsigned char b) { operator<<(b); }
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explicit CScript(unsigned int b) { operator<<(b); }
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explicit CScript(unsigned short b) { operator<<(b); }
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explicit CScript(unsigned long b) { operator<<(b); }
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explicit CScript(unsigned long long b) { operator<<(b); }
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explicit CScript(opcodetype b) { operator<<(b); }
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explicit CScript(const uint256& b) { operator<<(b); }
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explicit CScript(const CBigNum& b) { operator<<(b); }
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explicit CScript(const std::vector<unsigned char>& b) { operator<<(b); }
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//CScript& operator<<(char b) is not portable. Use 'signed char' or 'unsigned char'.
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CScript& operator<<(signed char b) { return push_int64(b); }
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CScript& operator<<(short b) { return push_int64(b); }
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CScript& operator<<(int b) { return push_int64(b); }
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CScript& operator<<(long b) { return push_int64(b); }
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CScript& operator<<(long long b) { return push_int64(b); }
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CScript& operator<<(unsigned char b) { return push_uint64(b); }
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CScript& operator<<(unsigned int b) { return push_uint64(b); }
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CScript& operator<<(unsigned short b) { return push_uint64(b); }
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CScript& operator<<(unsigned long b) { return push_uint64(b); }
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CScript& operator<<(unsigned long long b) { return push_uint64(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 uint160& b)
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{
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insert(end(), sizeof(b));
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insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
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return *this;
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}
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CScript& operator<<(const uint256& b)
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{
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insert(end(), sizeof(b));
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insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
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return *this;
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}
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CScript& operator<<(const CPubKey& key)
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{
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assert(key.size() < OP_PUSHDATA1);
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insert(end(), (unsigned char)key.size());
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insert(end(), key.begin(), key.end());
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return *this;
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}
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CScript& operator<<(const CBigNum& 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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unsigned short nSize = b.size();
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insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
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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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unsigned int nSize = b.size();
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insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
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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)
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{
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const_iterator pc2 = pc;
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bool fRet = GetOp2(pc2, opcodeRet, NULL);
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pc = begin() + (pc2 - begin());
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return fRet;
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}
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bool GetOp(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet) const
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{
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return GetOp2(pc, opcodeRet, &vchRet);
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}
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bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
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{
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return GetOp2(pc, opcodeRet, NULL);
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}
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bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
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{
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opcodeRet = OP_INVALIDOPCODE;
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if (pvchRet)
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pvchRet->clear();
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if (pc >= end())
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return false;
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// Read instruction
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if (end() - pc < 1)
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return false;
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unsigned int opcode = *pc++;
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// Immediate operand
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if (opcode <= OP_PUSHDATA4)
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{
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unsigned int nSize = 0;
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if (opcode < OP_PUSHDATA1)
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{
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nSize = opcode;
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}
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else if (opcode == OP_PUSHDATA1)
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{
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if (end() - pc < 1)
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return false;
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nSize = *pc++;
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}
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else if (opcode == OP_PUSHDATA2)
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{
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if (end() - pc < 2)
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return false;
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nSize = 0;
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memcpy(&nSize, &pc[0], 2);
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pc += 2;
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}
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else if (opcode == OP_PUSHDATA4)
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{
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if (end() - pc < 4)
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return false;
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memcpy(&nSize, &pc[0], 4);
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pc += 4;
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}
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if (end() - pc < 0 || (unsigned int)(end() - pc) < nSize)
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return false;
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if (pvchRet)
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pvchRet->assign(pc, pc + nSize);
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pc += nSize;
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}
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opcodeRet = (opcodetype)opcode;
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return true;
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}
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// Encode/decode small integers:
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static int DecodeOP_N(opcodetype opcode)
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{
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if (opcode == OP_0)
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return 0;
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assert(opcode >= OP_1 && opcode <= OP_16);
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return (int)opcode - (int)(OP_1 - 1);
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}
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static opcodetype EncodeOP_N(int n)
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{
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assert(n >= 0 && n <= 16);
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if (n == 0)
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return OP_0;
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return (opcodetype)(OP_1+n-1);
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}
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int FindAndDelete(const CScript& b)
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{
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int nFound = 0;
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if (b.empty())
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return nFound;
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iterator pc = begin();
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opcodetype opcode;
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do
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{
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while (end() - pc >= (long)b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
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{
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erase(pc, pc + b.size());
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++nFound;
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}
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}
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while (GetOp(pc, opcode));
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return nFound;
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}
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int Find(opcodetype op) const
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{
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int nFound = 0;
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opcodetype opcode;
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for (const_iterator pc = begin(); pc != end() && GetOp(pc, opcode);)
|
|
if (opcode == op)
|
|
++nFound;
|
|
return nFound;
|
|
}
|
|
|
|
// 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 IsPayToScriptHash() const;
|
|
|
|
// Called by IsStandardTx and P2SH VerifyScript (which makes it consensus-critical).
|
|
bool IsPushOnly() const;
|
|
|
|
// Called by IsStandardTx.
|
|
bool HasCanonicalPushes() 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);
|
|
}
|
|
|
|
void SetDestination(const CTxDestination& address);
|
|
void SetMultisig(int nRequired, const std::vector<CPubKey>& keys);
|
|
|
|
|
|
void PrintHex() const
|
|
{
|
|
LogPrintf("CScript(%s)\n", HexStr(begin(), end(), true).c_str());
|
|
}
|
|
|
|
std::string ToString() const
|
|
{
|
|
std::string str;
|
|
opcodetype opcode;
|
|
std::vector<unsigned char> vch;
|
|
const_iterator pc = begin();
|
|
while (pc < end())
|
|
{
|
|
if (!str.empty())
|
|
str += " ";
|
|
if (!GetOp(pc, opcode, vch))
|
|
{
|
|
str += "[error]";
|
|
return str;
|
|
}
|
|
if (0 <= opcode && opcode <= OP_PUSHDATA4)
|
|
str += ValueString(vch);
|
|
else
|
|
str += GetOpName(opcode);
|
|
}
|
|
return str;
|
|
}
|
|
|
|
void print() const
|
|
{
|
|
LogPrintf("%s\n", ToString().c_str());
|
|
}
|
|
|
|
CScriptID GetID() const
|
|
{
|
|
return CScriptID(Hash160(*this));
|
|
}
|
|
};
|
|
|
|
/** Compact serializer for scripts.
|
|
*
|
|
* It detects common cases and encodes them much more efficiently.
|
|
* 3 special cases are defined:
|
|
* * Pay to pubkey hash (encoded as 21 bytes)
|
|
* * Pay to script hash (encoded as 21 bytes)
|
|
* * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes)
|
|
*
|
|
* Other scripts up to 121 bytes require 1 byte + script length. Above
|
|
* that, scripts up to 16505 bytes require 2 bytes + script length.
|
|
*/
|
|
class CScriptCompressor
|
|
{
|
|
private:
|
|
// make this static for now (there are only 6 special scripts defined)
|
|
// this can potentially be extended together with a new nVersion for
|
|
// transactions, in which case this value becomes dependent on nVersion
|
|
// and nHeight of the enclosing transaction.
|
|
static const unsigned int nSpecialScripts = 6;
|
|
|
|
CScript &script;
|
|
protected:
|
|
// These check for scripts for which a special case with a shorter encoding is defined.
|
|
// They are implemented separately from the CScript test, as these test for exact byte
|
|
// sequence correspondences, and are more strict. For example, IsToPubKey also verifies
|
|
// whether the public key is valid (as invalid ones cannot be represented in compressed
|
|
// form).
|
|
bool IsToKeyID(CKeyID &hash) const;
|
|
bool IsToScriptID(CScriptID &hash) const;
|
|
bool IsToPubKey(CPubKey &pubkey) const;
|
|
|
|
bool Compress(std::vector<unsigned char> &out) const;
|
|
unsigned int GetSpecialSize(unsigned int nSize) const;
|
|
bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out);
|
|
public:
|
|
CScriptCompressor(CScript &scriptIn) : script(scriptIn) { }
|
|
|
|
unsigned int GetSerializeSize(int nType, int nVersion) const {
|
|
std::vector<unsigned char> compr;
|
|
if (Compress(compr))
|
|
return compr.size();
|
|
unsigned int nSize = script.size() + nSpecialScripts;
|
|
return script.size() + VARINT(nSize).GetSerializeSize(nType, nVersion);
|
|
}
|
|
|
|
template<typename Stream>
|
|
void Serialize(Stream &s, int nType, int nVersion) const {
|
|
std::vector<unsigned char> compr;
|
|
if (Compress(compr)) {
|
|
s << CFlatData(&compr[0], &compr[compr.size()]);
|
|
return;
|
|
}
|
|
unsigned int nSize = script.size() + nSpecialScripts;
|
|
s << VARINT(nSize);
|
|
s << CFlatData(&script[0], &script[script.size()]);
|
|
}
|
|
|
|
template<typename Stream>
|
|
void Unserialize(Stream &s, int nType, int nVersion) {
|
|
unsigned int nSize = 0;
|
|
s >> VARINT(nSize);
|
|
if (nSize < nSpecialScripts) {
|
|
std::vector<unsigned char> vch(GetSpecialSize(nSize), 0x00);
|
|
s >> REF(CFlatData(&vch[0], &vch[vch.size()]));
|
|
Decompress(nSize, vch);
|
|
return;
|
|
}
|
|
nSize -= nSpecialScripts;
|
|
script.resize(nSize);
|
|
s >> REF(CFlatData(&script[0], &script[script.size()]));
|
|
}
|
|
};
|
|
|
|
bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int flags);
|
|
bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);
|
|
|
|
bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
|
|
bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
|
|
int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
|
|
bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
|
|
bool IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
|
|
bool IsMine(const CKeyStore& keystore, const CTxDestination &dest);
|
|
void ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys);
|
|
bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
|
|
bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
|
|
bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
|
|
bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
|
|
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
|
|
|
|
// Given two sets of signatures for scriptPubKey, possibly with OP_0 placeholders,
|
|
// combine them intelligently and return the result.
|
|
CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn, const CScript& scriptSig1, const CScript& scriptSig2);
|
|
|
|
#endif
|