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script.cpp
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460 lines (416 loc) · 16.6 KB
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <script/script.h>
#include <util/strencodings.h>
#include <string>
std::string GetOpName(opcodetype opcode)
{
switch (opcode)
{
// push value
case OP_0 : return "0";
case OP_PUSHDATA1 : return "OP_PUSHDATA1";
case OP_PUSHDATA2 : return "OP_PUSHDATA2";
case OP_PUSHDATA4 : return "OP_PUSHDATA4";
case OP_1NEGATE : return "-1";
case OP_RESERVED : return "OP_RESERVED";
case OP_1 : return "1";
case OP_2 : return "2";
case OP_3 : return "3";
case OP_4 : return "4";
case OP_5 : return "5";
case OP_6 : return "6";
case OP_7 : return "7";
case OP_8 : return "8";
case OP_9 : return "9";
case OP_10 : return "10";
case OP_11 : return "11";
case OP_12 : return "12";
case OP_13 : return "13";
case OP_14 : return "14";
case OP_15 : return "15";
case OP_16 : return "16";
// control
case OP_NOP : return "OP_NOP";
case OP_VER : return "OP_VER";
case OP_IF : return "OP_IF";
case OP_NOTIF : return "OP_NOTIF";
case OP_VERIF : return "OP_VERIF";
case OP_VERNOTIF : return "OP_VERNOTIF";
case OP_ELSE : return "OP_ELSE";
case OP_ENDIF : return "OP_ENDIF";
case OP_VERIFY : return "OP_VERIFY";
case OP_RETURN : return "OP_RETURN";
// stack ops
case OP_TOALTSTACK : return "OP_TOALTSTACK";
case OP_FROMALTSTACK : return "OP_FROMALTSTACK";
case OP_2DROP : return "OP_2DROP";
case OP_2DUP : return "OP_2DUP";
case OP_3DUP : return "OP_3DUP";
case OP_2OVER : return "OP_2OVER";
case OP_2ROT : return "OP_2ROT";
case OP_2SWAP : return "OP_2SWAP";
case OP_IFDUP : return "OP_IFDUP";
case OP_DEPTH : return "OP_DEPTH";
case OP_DROP : return "OP_DROP";
case OP_DUP : return "OP_DUP";
case OP_NIP : return "OP_NIP";
case OP_OVER : return "OP_OVER";
case OP_PICK : return "OP_PICK";
case OP_ROLL : return "OP_ROLL";
case OP_ROT : return "OP_ROT";
case OP_SWAP : return "OP_SWAP";
case OP_TUCK : return "OP_TUCK";
// splice ops
case OP_CAT : return "OP_CAT";
case OP_SUBSTR : return "OP_SUBSTR";
case OP_SUBSTR_LAZY : return "OP_SUBSTR_LAZY";
case OP_LEFT : return "OP_LEFT";
case OP_RIGHT : return "OP_RIGHT";
case OP_SIZE : return "OP_SIZE";
// bit logic
case OP_INVERT : return "OP_INVERT";
case OP_AND : return "OP_AND";
case OP_OR : return "OP_OR";
case OP_XOR : return "OP_XOR";
case OP_EQUAL : return "OP_EQUAL";
case OP_EQUALVERIFY : return "OP_EQUALVERIFY";
case OP_RESERVED1 : return "OP_RESERVED1";
case OP_RESERVED2 : return "OP_RESERVED2";
// numeric
case OP_1ADD : return "OP_1ADD";
case OP_1SUB : return "OP_1SUB";
case OP_2MUL : return "OP_2MUL";
case OP_2DIV : return "OP_2DIV";
case OP_NEGATE : return "OP_NEGATE";
case OP_ABS : return "OP_ABS";
case OP_NOT : return "OP_NOT";
case OP_0NOTEQUAL : return "OP_0NOTEQUAL";
case OP_ADD : return "OP_ADD";
case OP_SUB : return "OP_SUB";
case OP_MUL : return "OP_MUL";
case OP_DIV : return "OP_DIV";
case OP_MOD : return "OP_MOD";
case OP_LSHIFT : return "OP_LSHIFT";
case OP_RSHIFT : return "OP_RSHIFT";
case OP_BOOLAND : return "OP_BOOLAND";
case OP_BOOLOR : return "OP_BOOLOR";
case OP_NUMEQUAL : return "OP_NUMEQUAL";
case OP_NUMEQUALVERIFY : return "OP_NUMEQUALVERIFY";
case OP_NUMNOTEQUAL : return "OP_NUMNOTEQUAL";
case OP_LESSTHAN : return "OP_LESSTHAN";
case OP_GREATERTHAN : return "OP_GREATERTHAN";
case OP_LESSTHANOREQUAL : return "OP_LESSTHANOREQUAL";
case OP_GREATERTHANOREQUAL : return "OP_GREATERTHANOREQUAL";
case OP_MIN : return "OP_MIN";
case OP_MAX : return "OP_MAX";
case OP_WITHIN : return "OP_WITHIN";
// crypto
case OP_RIPEMD160 : return "OP_RIPEMD160";
case OP_SHA1 : return "OP_SHA1";
case OP_SHA256 : return "OP_SHA256";
case OP_HASH160 : return "OP_HASH160";
case OP_HASH256 : return "OP_HASH256";
case OP_CODESEPARATOR : return "OP_CODESEPARATOR";
case OP_CHECKSIG : return "OP_CHECKSIG";
case OP_CHECKSIGVERIFY : return "OP_CHECKSIGVERIFY";
case OP_CHECKMULTISIG : return "OP_CHECKMULTISIG";
case OP_CHECKMULTISIGVERIFY : return "OP_CHECKMULTISIGVERIFY";
case OP_DETERMINISTICRANDOM : return "OP_DETERMINISTICRANDOM";
case OP_CHECKSIGFROMSTACK : return "OP_CHECKSIGFROMSTACK";
case OP_CHECKSIGFROMSTACKVERIFY: return "OP_CHECKSIGFROMSTACKVERIFY";
// expansion
case OP_NOP1 : return "OP_NOP1";
case OP_CHECKLOCKTIMEVERIFY : return "OP_CHECKLOCKTIMEVERIFY";
case OP_CHECKSEQUENCEVERIFY : return "OP_CHECKSEQUENCEVERIFY";
case OP_NOP4 : return "OP_NOP4";
case OP_NOP5 : return "OP_NOP5";
case OP_NOP6 : return "OP_NOP6";
case OP_NOP7 : return "OP_NOP7";
case OP_NOP8 : return "OP_NOP8";
case OP_NOP9 : return "OP_NOP9";
case OP_NOP10 : return "OP_NOP10";
// Opcode added by BIP 342 (Tapscript)
case OP_CHECKSIGADD : return "OP_CHECKSIGADD";
// Elements Tapscript opcodes
case OP_SHA256INITIALIZE : return "OP_SHA256INITIALIZE";
case OP_SHA256UPDATE : return "OP_SHA256UPDATE";
case OP_SHA256FINALIZE : return "OP_SHA256FINALIZE";
case OP_INSPECTINPUTOUTPOINT : return "OP_INSPECTINPUTOUTPOINT";
case OP_INSPECTINPUTASSET : return "OP_INSPECTINPUTASSET";
case OP_INSPECTINPUTVALUE : return "OP_INSPECTINPUTVALUE";
case OP_INSPECTINPUTSCRIPTPUBKEY : return "OP_INSPECTINPUTSCRIPTPUBKEY";
case OP_INSPECTINPUTSEQUENCE : return "OP_INSPECTINPUTSEQUENCE";
case OP_INSPECTINPUTISSUANCE : return "OP_INSPECTINPUTISSUANCE";
case OP_PUSHCURRENTINPUTINDEX : return "OP_PUSHCURRENTINPUTINDEX";
case OP_INSPECTOUTPUTASSET : return "OP_INSPECTOUTPUTASSET";
case OP_INSPECTOUTPUTVALUE : return "OP_INSPECTOUTPUTVALUE";
case OP_INSPECTOUTPUTNONCE : return "OP_INSPECTOUTPUTNONCE";
case OP_INSPECTOUTPUTSCRIPTPUBKEY : return "OP_INSPECTOUTPUTSCRIPTPUBKEY";
case OP_INSPECTVERSION : return "OP_INSPECTVERSION";
case OP_INSPECTLOCKTIME : return "OP_INSPECTLOCKTIME";
case OP_INSPECTNUMINPUTS : return "OP_INSPECTNUMINPUTS";
case OP_INSPECTNUMOUTPUTS : return "OP_INSPECTNUMOUTPUTS";
case OP_TXWEIGHT : return "OP_TXWEIGHT";
// 64 bit LE arithmetic opcodes
case OP_ADD64 : return "OP_ADD64";
case OP_SUB64 : return "OP_SUB64";
case OP_MUL64 : return "OP_MUL64";
case OP_DIV64 : return "OP_DIV64";
case OP_NEG64 : return "OP_NEG64";
case OP_LESSTHAN64 : return "OP_LESSTHAN64";
case OP_LESSTHANOREQUAL64 : return "OP_LESSTHANOREQUAL64";
case OP_GREATERTHAN64 : return "OP_GREATERTHAN64";
case OP_GREATERTHANOREQUAL64 : return "OP_GREATERTHANOREQUAL64";
case OP_SCRIPTNUMTOLE64 : return "OP_SCRIPTNUMTOLE64";
case OP_LE64TOSCRIPTNUM : return "OP_LE64TOSCRIPTNUM";
case OP_LE32TOLE64 : return "OP_LE32TOLE64";
// Crypto opcodes
case OP_ECMULSCALARVERIFY : return "OP_ECMULSCALARVERIFY";
case OP_TWEAKVERIFY : return "OP_TWEAKVERIFY";
case OP_INVALIDOPCODE : return "OP_INVALIDOPCODE";
default:
return "OP_UNKNOWN";
}
}
unsigned int CScript::GetSigOpCount(bool fAccurate) const
{
unsigned int n = 0;
const_iterator pc = begin();
opcodetype lastOpcode = OP_INVALIDOPCODE;
while (pc < end())
{
opcodetype opcode;
if (!GetOp(pc, opcode))
break;
if (opcode == OP_CHECKSIG || opcode == OP_CHECKSIGVERIFY ||
opcode == OP_CHECKSIGFROMSTACK || opcode == OP_CHECKSIGFROMSTACKVERIFY)
n++;
else if (opcode == OP_CHECKMULTISIG || opcode == OP_CHECKMULTISIGVERIFY)
{
if (fAccurate && lastOpcode >= OP_1 && lastOpcode <= OP_16)
n += DecodeOP_N(lastOpcode);
else
n += MAX_PUBKEYS_PER_MULTISIG;
}
lastOpcode = opcode;
}
return n;
}
unsigned int CScript::GetSigOpCount(const CScript& scriptSig) const
{
if (!IsPayToScriptHash())
return GetSigOpCount(true);
// This is a pay-to-script-hash scriptPubKey;
// get the last item that the scriptSig
// pushes onto the stack:
const_iterator pc = scriptSig.begin();
std::vector<unsigned char> vData;
while (pc < scriptSig.end())
{
opcodetype opcode;
if (!scriptSig.GetOp(pc, opcode, vData))
return 0;
if (opcode > OP_16)
return 0;
}
/// ... and return its opcount:
CScript subscript(vData.begin(), vData.end());
return subscript.GetSigOpCount(true);
}
//
// ELEMENTS:
bool CScript::IsPegoutScript(uint256& genesis_hash, CScript& pegout_scriptpubkey) const
{
const_iterator pc = begin();
std::vector<unsigned char> data;
opcodetype opcode;
// OP_RETURN
if (!GetOp(pc, opcode, data) || opcode != OP_RETURN) {
return false;
}
if (!GetOp(pc, opcode, data) || data.size() != 32 || opcode > OP_PUSHDATA4) {
return false;
}
genesis_hash = uint256(data);
// Read in parent chain destination scriptpubkey
if (!GetOp(pc, opcode, data) || opcode > OP_PUSHDATA4 ) {
return false;
}
pegout_scriptpubkey = CScript(data.begin(), data.end());
// All extra opcodes must be pushes
while(GetOp(pc, opcode, data)) {
if (opcode > OP_PUSHDATA4) {
return false;
}
}
return true;
}
bool CScript::IsPegoutScript(const uint256& genesis_hash_check) const
{
uint256 genesis_hash;
CScript pegout_scriptpubkey;
// Ensure hash matches parent chain genesis block
if (this->IsPegoutScript(genesis_hash, pegout_scriptpubkey) &&
genesis_hash_check == genesis_hash) {
return true;
}
return false;
}
bool CScript::IsPayToPubkeyHash() const
{
// Extra-fast test for pay-to-pubkey-hash CScripts:
return (this->size() == 25 &&
(*this)[0] == OP_DUP &&
(*this)[1] == OP_HASH160 &&
(*this)[2] == 0x14 &&
(*this)[23] == OP_EQUALVERIFY &&
(*this)[24] == OP_CHECKSIG);
}
bool CScript::IsPayToWitnessPubkeyHash() const
{
return (this->size() == 22 &&
(*this)[0] == 0x00 &&
(*this)[1] == 0x14);
}
// END ELEMENTS
//
bool CScript::IsPayToScriptHash() const
{
// Extra-fast test for pay-to-script-hash CScripts:
return (this->size() == 23 &&
(*this)[0] == OP_HASH160 &&
(*this)[1] == 0x14 &&
(*this)[22] == OP_EQUAL);
}
bool CScript::IsPayToWitnessScriptHash() const
{
// Extra-fast test for pay-to-witness-script-hash CScripts:
return (this->size() == 34 &&
(*this)[0] == OP_0 &&
(*this)[1] == 0x20);
}
// A witness program is any valid CScript that consists of a 1-byte push opcode
// followed by a data push between 2 and 40 bytes.
bool CScript::IsWitnessProgram(int& version, std::vector<unsigned char>& program) const
{
if (this->size() < 4 || this->size() > 42) {
return false;
}
if ((*this)[0] != OP_0 && ((*this)[0] < OP_1 || (*this)[0] > OP_16)) {
return false;
}
if ((size_t)((*this)[1] + 2) == this->size()) {
version = DecodeOP_N((opcodetype)(*this)[0]);
program = std::vector<unsigned char>(this->begin() + 2, this->end());
return true;
}
return false;
}
bool CScript::IsPushOnly(const_iterator pc) const
{
while (pc < end())
{
opcodetype opcode;
if (!GetOp(pc, opcode))
return false;
// Note that IsPushOnly() *does* consider OP_RESERVED to be a
// push-type opcode, however execution of OP_RESERVED fails, so
// it's not relevant to P2SH/BIP62 as the scriptSig would fail prior to
// the P2SH special validation code being executed.
if (opcode > OP_16)
return false;
}
return true;
}
bool CScript::IsPushOnly() const
{
return this->IsPushOnly(begin());
}
std::string CScriptWitness::ToString() const
{
std::string ret = "CScriptWitness(";
for (unsigned int i = 0; i < stack.size(); i++) {
if (i) {
ret += ", ";
}
ret += HexStr(stack[i]);
}
return ret + ")";
}
uint32_t CScriptWitness::GetSerializedSize() const
{
return ::GetSerializeSize(stack, 0);
}
bool CScript::HasValidOps() const
{
CScript::const_iterator it = begin();
while (it < end()) {
opcodetype opcode;
std::vector<unsigned char> item;
if (!GetOp(it, opcode, item) || opcode > MAX_OPCODE || item.size() > MAX_SCRIPT_ELEMENT_SIZE) {
return false;
}
}
return true;
}
bool GetScriptOp(CScriptBase::const_iterator& pc, CScriptBase::const_iterator end, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet)
{
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 = static_cast<opcodetype>(opcode);
return true;
}
bool IsOpSuccess(const opcodetype& opcode)
{
// ELEMENTS: Don't mark opcodes (OP_CAT, OP_SUBSTR, OP_LEFT, OP_RIGHT) as OP_SUCCESS
return opcode == 80 || opcode == 98 || (opcode >= 137 && opcode <= 138) ||
// ELEMENTS: Don't mark OP_INVERT , OP_AND, OP_OR, OP_XOR. OP_LSHIFT, OP_RSHIFT as success
(opcode >= 141 && opcode <= 142) || (opcode >= 149 && opcode <= 151) ||
// ELEMENTS: Exclude OP_DETERMINISTICRANDOM(192), OP_CHECKSIGFROMSTACK(VERIFY)(192-193), OP_SUBSTRLAZY(195)
// ELEMENTS: Tapscript extension from OP_SHA256INITIALIZE(196) till OP_TWEAKVERIFY(228)
(opcode >= 187 && opcode <= 191) || (opcode >= 229 && opcode <= 254);
}