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bitcoin/src/script.h
Dwayne C. Litzenberger e5b980d72f Fix bugs on 'unsigned char' platforms. 
In ISO C++, the signedness of 'char' is undefined.  On some platforms (e.g.
ARM), 'char' is an unsigned type, but some of the code relies on 'char' being
signed (as it is on x86).  This is indicated by compiler warnings like this:

 bignum.h: In constructor 'CBigNum::CBigNum(char)':
 bignum.h:81:59: warning: comparison is always true due to limited range of data type [-Wtype-limits]

 util.cpp: In function 'bool IsHex(const string&)':
 util.cpp:427:28: warning: comparison is always false due to limited range of data type [-Wtype-limits]

In particular, IsHex erroneously returned true regardless of the input
characters, as long as the length of the string was a positive multiple of 2.

Note: For testing, it's possible using GCC to force char to be unsigned by
adding the -funsigned-char parameter to xCXXFLAGS.
2012-04-22 09:38:27 -04:00

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2011 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#ifndef H_BITCOIN_SCRIPT
#define H_BITCOIN_SCRIPT
#include "base58.h"
#include "keystore.h"
#include <string>
#include <vector>
#include <boost/foreach.hpp>
class CTransaction;
enum
{
SIGHASH_ALL = 1,
SIGHASH_NONE = 2,
SIGHASH_SINGLE = 3,
SIGHASH_ANYONECANPAY = 0x80,
};
enum opcodetype
{
// push value
OP_0=0,
OP_FALSE=OP_0,
OP_PUSHDATA1=76,
OP_PUSHDATA2,
OP_PUSHDATA4,
OP_1NEGATE,
OP_RESERVED,
OP_1,
OP_TRUE=OP_1,
OP_2,
OP_3,
OP_4,
OP_5,
OP_6,
OP_7,
OP_8,
OP_9,
OP_10,
OP_11,
OP_12,
OP_13,
OP_14,
OP_15,
OP_16,
// control
OP_NOP,
OP_VER,
OP_IF,
OP_NOTIF,
OP_VERIF,
OP_VERNOTIF,
OP_ELSE,
OP_ENDIF,
OP_VERIFY,
OP_RETURN,
// stack ops
OP_TOALTSTACK,
OP_FROMALTSTACK,
OP_2DROP,
OP_2DUP,
OP_3DUP,
OP_2OVER,
OP_2ROT,
OP_2SWAP,
OP_IFDUP,
OP_DEPTH,
OP_DROP,
OP_DUP,
OP_NIP,
OP_OVER,
OP_PICK,
OP_ROLL,
OP_ROT,
OP_SWAP,
OP_TUCK,
// splice ops
OP_CAT,
OP_SUBSTR,
OP_LEFT,
OP_RIGHT,
OP_SIZE,
// bit logic
OP_INVERT,
OP_AND,
OP_OR,
OP_XOR,
OP_EQUAL,
OP_EQUALVERIFY,
OP_RESERVED1,
OP_RESERVED2,
// numeric
OP_1ADD,
OP_1SUB,
OP_2MUL,
OP_2DIV,
OP_NEGATE,
OP_ABS,
OP_NOT,
OP_0NOTEQUAL,
OP_ADD,
OP_SUB,
OP_MUL,
OP_DIV,
OP_MOD,
OP_LSHIFT,
OP_RSHIFT,
OP_BOOLAND,
OP_BOOLOR,
OP_NUMEQUAL,
OP_NUMEQUALVERIFY,
OP_NUMNOTEQUAL,
OP_LESSTHAN,
OP_GREATERTHAN,
OP_LESSTHANOREQUAL,
OP_GREATERTHANOREQUAL,
OP_MIN,
OP_MAX,
OP_WITHIN,
// crypto
OP_RIPEMD160,
OP_SHA1,
OP_SHA256,
OP_HASH160,
OP_HASH256,
OP_CODESEPARATOR,
OP_CHECKSIG,
OP_CHECKSIGVERIFY,
OP_CHECKMULTISIG,
OP_CHECKMULTISIGVERIFY,
// expansion
OP_NOP1,
OP_NOP2,
OP_NOP3,
OP_NOP4,
OP_NOP5,
OP_NOP6,
OP_NOP7,
OP_NOP8,
OP_NOP9,
OP_NOP10,
// template matching params
OP_PUBKEYHASH = 0xfd,
OP_PUBKEY = 0xfe,
OP_INVALIDOPCODE = 0xff,
};
inline const char* 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_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";
// expanson
case OP_NOP1 : return "OP_NOP1";
case OP_NOP2 : return "OP_NOP2";
case OP_NOP3 : return "OP_NOP3";
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";
// template matching params
case OP_PUBKEYHASH : return "OP_PUBKEYHASH";
case OP_PUBKEY : return "OP_PUBKEY";
case OP_INVALIDOPCODE : return "OP_INVALIDOPCODE";
default:
return "OP_UNKNOWN";
}
};
inline std::string ValueString(const std::vector<unsigned char>& vch)
{
if (vch.size() <= 4)
return strprintf("%d", CBigNum(vch).getint());
else
return HexStr(vch);
}
inline std::string StackString(const std::vector<std::vector<unsigned char> >& vStack)
{
std::string str;
BOOST_FOREACH(const std::vector<unsigned char>& vch, vStack)
{
if (!str.empty())
str += " ";
str += ValueString(vch);
}
return str;
}
class CScript : public std::vector<unsigned char>
{
protected:
CScript& push_int64(int64 n)
{
if (n == -1 || (n >= 1 && n <= 16))
{
push_back(n + (OP_1 - 1));
}
else
{
CBigNum bn(n);
*this << bn.getvch();
}
return *this;
}
CScript& push_uint64(uint64 n)
{
if (n >= 1 && n <= 16)
{
push_back(n + (OP_1 - 1));
}
else
{
CBigNum bn(n);
*this << bn.getvch();
}
return *this;
}
public:
CScript() { }
CScript(const CScript& b) : std::vector<unsigned char>(b.begin(), b.end()) { }
CScript(const_iterator pbegin, const_iterator pend) : std::vector<unsigned char>(pbegin, pend) { }
#ifndef _MSC_VER
CScript(const unsigned char* pbegin, const unsigned char* pend) : std::vector<unsigned char>(pbegin, pend) { }
#endif
CScript& operator+=(const CScript& b)
{
insert(end(), b.begin(), b.end());
return *this;
}
friend CScript operator+(const CScript& a, const CScript& b)
{
CScript ret = a;
ret += b;
return ret;
}
//explicit CScript(char b) is not portable. Use 'signed char' or 'unsigned char'.
explicit CScript(signed char b) { operator<<(b); }
explicit CScript(short b) { operator<<(b); }
explicit CScript(int b) { operator<<(b); }
explicit CScript(long b) { operator<<(b); }
explicit CScript(int64 b) { operator<<(b); }
explicit CScript(unsigned char b) { operator<<(b); }
explicit CScript(unsigned int b) { operator<<(b); }
explicit CScript(unsigned short b) { operator<<(b); }
explicit CScript(unsigned long b) { operator<<(b); }
explicit CScript(uint64 b) { operator<<(b); }
explicit CScript(opcodetype b) { operator<<(b); }
explicit CScript(const uint256& b) { operator<<(b); }
explicit CScript(const CBigNum& b) { operator<<(b); }
explicit CScript(const std::vector<unsigned char>& b) { operator<<(b); }
//CScript& operator<<(char b) is not portable. Use 'signed char' or 'unsigned char'.
CScript& operator<<(signed char b) { return push_int64(b); }
CScript& operator<<(short b) { return push_int64(b); }
CScript& operator<<(int b) { return push_int64(b); }
CScript& operator<<(long b) { return push_int64(b); }
CScript& operator<<(int64 b) { return push_int64(b); }
CScript& operator<<(unsigned char b) { return push_uint64(b); }
CScript& operator<<(unsigned int b) { return push_uint64(b); }
CScript& operator<<(unsigned short b) { return push_uint64(b); }
CScript& operator<<(unsigned long b) { return push_uint64(b); }
CScript& operator<<(uint64 b) { return push_uint64(b); }
CScript& operator<<(opcodetype opcode)
{
if (opcode < 0 || opcode > 0xff)
throw std::runtime_error("CScript::operator<<() : invalid opcode");
insert(end(), (unsigned char)opcode);
return *this;
}
CScript& operator<<(const uint160& b)
{
insert(end(), sizeof(b));
insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
return *this;
}
CScript& operator<<(const uint256& b)
{
insert(end(), sizeof(b));
insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
return *this;
}
CScript& operator<<(const CBigNum& b)
{
*this << b.getvch();
return *this;
}
CScript& operator<<(const std::vector<unsigned char>& b)
{
if (b.size() < OP_PUSHDATA1)
{
insert(end(), (unsigned char)b.size());
}
else if (b.size() <= 0xff)
{
insert(end(), OP_PUSHDATA1);
insert(end(), (unsigned char)b.size());
}
else if (b.size() <= 0xffff)
{
insert(end(), OP_PUSHDATA2);
unsigned short nSize = b.size();
insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
}
else
{
insert(end(), OP_PUSHDATA4);
unsigned int nSize = b.size();
insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
}
insert(end(), b.begin(), b.end());
return *this;
}
CScript& operator<<(const CScript& b)
{
// I'm not sure if this should push the script or concatenate scripts.
// If there's ever a use for pushing a script onto a script, delete this member fn
assert(!"warning: pushing a CScript onto a CScript with << is probably not intended, use + to concatenate");
return *this;
}
bool GetOp(iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet)
{
// Wrapper so it can be called with either iterator or const_iterator
const_iterator pc2 = pc;
bool fRet = GetOp2(pc2, opcodeRet, &vchRet);
pc = begin() + (pc2 - begin());
return fRet;
}
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;
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 = 0;
memcpy(&nSize, &pc[0], 2);
pc += 2;
}
else if (opcode == OP_PUSHDATA4)
{
if (end() - pc < 4)
return false;
memcpy(&nSize, &pc[0], 4);
pc += 4;
}
if (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);
}
void FindAndDelete(const CScript& b)
{
if (b.empty())
return;
iterator pc = begin();
opcodetype opcode;
do
{
while (end() - pc >= b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
erase(pc, pc + b.size());
}
while (GetOp(pc, opcode));
}
int Find(opcodetype op) const
{
int nFound = 0;
opcodetype opcode;
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 ...
int GetSigOpCount(bool fAccurate=false) const;
// Accurately count sigOps, including sigOps in
// pay-to-script-hash transactions:
int GetSigOpCount(const CScript& scriptSig) const;
bool IsPayToScriptHash() const;
bool IsPushOnly() const
{
if (size() > 200)
return false;
const_iterator pc = begin();
while (pc < end())
{
opcodetype opcode;
if (!GetOp(pc, opcode))
return false;
if (opcode > OP_16)
return false;
}
return true;
}
CBitcoinAddress GetBitcoinAddress() const
{
opcodetype opcode;
std::vector<unsigned char> vch;
CScript::const_iterator pc = begin();
if (!GetOp(pc, opcode, vch) || opcode != OP_DUP) return 0;
if (!GetOp(pc, opcode, vch) || opcode != OP_HASH160) return 0;
if (!GetOp(pc, opcode, vch) || vch.size() != sizeof(uint160)) return 0;
uint160 hash160 = uint160(vch);
if (!GetOp(pc, opcode, vch) || opcode != OP_EQUALVERIFY) return 0;
if (!GetOp(pc, opcode, vch) || opcode != OP_CHECKSIG) return 0;
if (pc != end()) return 0;
return CBitcoinAddress(hash160);
}
void SetBitcoinAddress(const CBitcoinAddress& address)
{
this->clear();
*this << OP_DUP << OP_HASH160 << address.GetHash160() << OP_EQUALVERIFY << OP_CHECKSIG;
}
void SetBitcoinAddress(const std::vector<unsigned char>& vchPubKey)
{
SetBitcoinAddress(CBitcoinAddress(vchPubKey));
}
void PrintHex() const
{
printf("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
{
printf("%s\n", ToString().c_str());
}
};
bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType);
bool IsStandard(const CScript& scriptPubKey);
bool IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
bool ExtractAddress(const CScript& scriptPubKey, const CKeyStore* pkeystore, CBitcoinAddress& addressRet);
bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL, CScript scriptPrereq=CScript());
bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType);
#endif
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