mirror of https://github.com/bitcoin/bitcoin
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1205 lines
38 KiB
1205 lines
38 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
|
|
// Distributed under the MIT/X11 software license, see the accompanying
|
|
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#include "headers.h"
|
|
|
|
bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
|
|
|
|
|
|
|
|
typedef vector<unsigned char> valtype;
|
|
static const valtype vchFalse(0);
|
|
static const valtype vchZero(0);
|
|
static const valtype vchTrue(1, 1);
|
|
static const CBigNum bnZero(0);
|
|
static const CBigNum bnOne(1);
|
|
static const CBigNum bnFalse(0);
|
|
static const CBigNum bnTrue(1);
|
|
static const size_t nMaxNumSize = 4;
|
|
|
|
|
|
CBigNum CastToBigNum(const valtype& vch)
|
|
{
|
|
if (vch.size() > nMaxNumSize)
|
|
throw runtime_error("CastToBigNum() : overflow");
|
|
// Get rid of extra leading zeros
|
|
return CBigNum(CBigNum(vch).getvch());
|
|
}
|
|
|
|
bool CastToBool(const valtype& vch)
|
|
{
|
|
for (int i = 0; i < vch.size(); i++)
|
|
{
|
|
if (vch[i] != 0)
|
|
{
|
|
// Can be negative zero
|
|
if (i == vch.size()-1 && vch[i] == 0x80)
|
|
return false;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void MakeSameSize(valtype& vch1, valtype& vch2)
|
|
{
|
|
// Lengthen the shorter one
|
|
if (vch1.size() < vch2.size())
|
|
vch1.resize(vch2.size(), 0);
|
|
if (vch2.size() < vch1.size())
|
|
vch2.resize(vch1.size(), 0);
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// Script is a stack machine (like Forth) that evaluates a predicate
|
|
// returning a bool indicating valid or not. There are no loops.
|
|
//
|
|
#define stacktop(i) (stack.at(stack.size()+(i)))
|
|
#define altstacktop(i) (altstack.at(altstack.size()+(i)))
|
|
static inline void popstack(vector<valtype>& stack)
|
|
{
|
|
if (stack.empty())
|
|
throw runtime_error("popstack() : stack empty");
|
|
stack.pop_back();
|
|
}
|
|
|
|
|
|
bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
CAutoBN_CTX pctx;
|
|
CScript::const_iterator pc = script.begin();
|
|
CScript::const_iterator pend = script.end();
|
|
CScript::const_iterator pbegincodehash = script.begin();
|
|
opcodetype opcode;
|
|
valtype vchPushValue;
|
|
vector<bool> vfExec;
|
|
vector<valtype> altstack;
|
|
if (script.size() > 10000)
|
|
return false;
|
|
int nOpCount = 0;
|
|
|
|
|
|
try
|
|
{
|
|
while (pc < pend)
|
|
{
|
|
bool fExec = !count(vfExec.begin(), vfExec.end(), false);
|
|
|
|
//
|
|
// Read instruction
|
|
//
|
|
if (!script.GetOp(pc, opcode, vchPushValue))
|
|
return false;
|
|
if (vchPushValue.size() > 520)
|
|
return false;
|
|
if (opcode > OP_16 && ++nOpCount > 201)
|
|
return false;
|
|
|
|
if (opcode == OP_CAT ||
|
|
opcode == OP_SUBSTR ||
|
|
opcode == OP_LEFT ||
|
|
opcode == OP_RIGHT ||
|
|
opcode == OP_INVERT ||
|
|
opcode == OP_AND ||
|
|
opcode == OP_OR ||
|
|
opcode == OP_XOR ||
|
|
opcode == OP_2MUL ||
|
|
opcode == OP_2DIV ||
|
|
opcode == OP_MUL ||
|
|
opcode == OP_DIV ||
|
|
opcode == OP_MOD ||
|
|
opcode == OP_LSHIFT ||
|
|
opcode == OP_RSHIFT)
|
|
return false;
|
|
|
|
if (fExec && 0 <= opcode && opcode <= OP_PUSHDATA4)
|
|
stack.push_back(vchPushValue);
|
|
else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
|
|
switch (opcode)
|
|
{
|
|
//
|
|
// Push value
|
|
//
|
|
case OP_1NEGATE:
|
|
case OP_1:
|
|
case OP_2:
|
|
case OP_3:
|
|
case OP_4:
|
|
case OP_5:
|
|
case OP_6:
|
|
case OP_7:
|
|
case OP_8:
|
|
case OP_9:
|
|
case OP_10:
|
|
case OP_11:
|
|
case OP_12:
|
|
case OP_13:
|
|
case OP_14:
|
|
case OP_15:
|
|
case OP_16:
|
|
{
|
|
// ( -- value)
|
|
CBigNum bn((int)opcode - (int)(OP_1 - 1));
|
|
stack.push_back(bn.getvch());
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Control
|
|
//
|
|
case OP_NOP:
|
|
case OP_NOP1: case OP_NOP2: case OP_NOP3: case OP_NOP4: case OP_NOP5:
|
|
case OP_NOP6: case OP_NOP7: case OP_NOP8: case OP_NOP9: case OP_NOP10:
|
|
break;
|
|
|
|
case OP_IF:
|
|
case OP_NOTIF:
|
|
{
|
|
// <expression> if [statements] [else [statements]] endif
|
|
bool fValue = false;
|
|
if (fExec)
|
|
{
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype& vch = stacktop(-1);
|
|
fValue = CastToBool(vch);
|
|
if (opcode == OP_NOTIF)
|
|
fValue = !fValue;
|
|
popstack(stack);
|
|
}
|
|
vfExec.push_back(fValue);
|
|
}
|
|
break;
|
|
|
|
case OP_ELSE:
|
|
{
|
|
if (vfExec.empty())
|
|
return false;
|
|
vfExec.back() = !vfExec.back();
|
|
}
|
|
break;
|
|
|
|
case OP_ENDIF:
|
|
{
|
|
if (vfExec.empty())
|
|
return false;
|
|
vfExec.pop_back();
|
|
}
|
|
break;
|
|
|
|
case OP_VERIFY:
|
|
{
|
|
// (true -- ) or
|
|
// (false -- false) and return
|
|
if (stack.size() < 1)
|
|
return false;
|
|
bool fValue = CastToBool(stacktop(-1));
|
|
if (fValue)
|
|
popstack(stack);
|
|
else
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case OP_RETURN:
|
|
{
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Stack ops
|
|
//
|
|
case OP_TOALTSTACK:
|
|
{
|
|
if (stack.size() < 1)
|
|
return false;
|
|
altstack.push_back(stacktop(-1));
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_FROMALTSTACK:
|
|
{
|
|
if (altstack.size() < 1)
|
|
return false;
|
|
stack.push_back(altstacktop(-1));
|
|
popstack(altstack);
|
|
}
|
|
break;
|
|
|
|
case OP_2DROP:
|
|
{
|
|
// (x1 x2 -- )
|
|
if (stack.size() < 2)
|
|
return false;
|
|
popstack(stack);
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_2DUP:
|
|
{
|
|
// (x1 x2 -- x1 x2 x1 x2)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype vch1 = stacktop(-2);
|
|
valtype vch2 = stacktop(-1);
|
|
stack.push_back(vch1);
|
|
stack.push_back(vch2);
|
|
}
|
|
break;
|
|
|
|
case OP_3DUP:
|
|
{
|
|
// (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
|
|
if (stack.size() < 3)
|
|
return false;
|
|
valtype vch1 = stacktop(-3);
|
|
valtype vch2 = stacktop(-2);
|
|
valtype vch3 = stacktop(-1);
|
|
stack.push_back(vch1);
|
|
stack.push_back(vch2);
|
|
stack.push_back(vch3);
|
|
}
|
|
break;
|
|
|
|
case OP_2OVER:
|
|
{
|
|
// (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
|
|
if (stack.size() < 4)
|
|
return false;
|
|
valtype vch1 = stacktop(-4);
|
|
valtype vch2 = stacktop(-3);
|
|
stack.push_back(vch1);
|
|
stack.push_back(vch2);
|
|
}
|
|
break;
|
|
|
|
case OP_2ROT:
|
|
{
|
|
// (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
|
|
if (stack.size() < 6)
|
|
return false;
|
|
valtype vch1 = stacktop(-6);
|
|
valtype vch2 = stacktop(-5);
|
|
stack.erase(stack.end()-6, stack.end()-4);
|
|
stack.push_back(vch1);
|
|
stack.push_back(vch2);
|
|
}
|
|
break;
|
|
|
|
case OP_2SWAP:
|
|
{
|
|
// (x1 x2 x3 x4 -- x3 x4 x1 x2)
|
|
if (stack.size() < 4)
|
|
return false;
|
|
swap(stacktop(-4), stacktop(-2));
|
|
swap(stacktop(-3), stacktop(-1));
|
|
}
|
|
break;
|
|
|
|
case OP_IFDUP:
|
|
{
|
|
// (x - 0 | x x)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype vch = stacktop(-1);
|
|
if (CastToBool(vch))
|
|
stack.push_back(vch);
|
|
}
|
|
break;
|
|
|
|
case OP_DEPTH:
|
|
{
|
|
// -- stacksize
|
|
CBigNum bn(stack.size());
|
|
stack.push_back(bn.getvch());
|
|
}
|
|
break;
|
|
|
|
case OP_DROP:
|
|
{
|
|
// (x -- )
|
|
if (stack.size() < 1)
|
|
return false;
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_DUP:
|
|
{
|
|
// (x -- x x)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype vch = stacktop(-1);
|
|
stack.push_back(vch);
|
|
}
|
|
break;
|
|
|
|
case OP_NIP:
|
|
{
|
|
// (x1 x2 -- x2)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
stack.erase(stack.end() - 2);
|
|
}
|
|
break;
|
|
|
|
case OP_OVER:
|
|
{
|
|
// (x1 x2 -- x1 x2 x1)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype vch = stacktop(-2);
|
|
stack.push_back(vch);
|
|
}
|
|
break;
|
|
|
|
case OP_PICK:
|
|
case OP_ROLL:
|
|
{
|
|
// (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
|
|
// (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
int n = CastToBigNum(stacktop(-1)).getint();
|
|
popstack(stack);
|
|
if (n < 0 || n >= stack.size())
|
|
return false;
|
|
valtype vch = stacktop(-n-1);
|
|
if (opcode == OP_ROLL)
|
|
stack.erase(stack.end()-n-1);
|
|
stack.push_back(vch);
|
|
}
|
|
break;
|
|
|
|
case OP_ROT:
|
|
{
|
|
// (x1 x2 x3 -- x2 x3 x1)
|
|
// x2 x1 x3 after first swap
|
|
// x2 x3 x1 after second swap
|
|
if (stack.size() < 3)
|
|
return false;
|
|
swap(stacktop(-3), stacktop(-2));
|
|
swap(stacktop(-2), stacktop(-1));
|
|
}
|
|
break;
|
|
|
|
case OP_SWAP:
|
|
{
|
|
// (x1 x2 -- x2 x1)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
swap(stacktop(-2), stacktop(-1));
|
|
}
|
|
break;
|
|
|
|
case OP_TUCK:
|
|
{
|
|
// (x1 x2 -- x2 x1 x2)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype vch = stacktop(-1);
|
|
stack.insert(stack.end()-2, vch);
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Splice ops
|
|
//
|
|
case OP_CAT:
|
|
{
|
|
// (x1 x2 -- out)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype& vch1 = stacktop(-2);
|
|
valtype& vch2 = stacktop(-1);
|
|
vch1.insert(vch1.end(), vch2.begin(), vch2.end());
|
|
popstack(stack);
|
|
if (stacktop(-1).size() > 520)
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case OP_SUBSTR:
|
|
{
|
|
// (in begin size -- out)
|
|
if (stack.size() < 3)
|
|
return false;
|
|
valtype& vch = stacktop(-3);
|
|
int nBegin = CastToBigNum(stacktop(-2)).getint();
|
|
int nEnd = nBegin + CastToBigNum(stacktop(-1)).getint();
|
|
if (nBegin < 0 || nEnd < nBegin)
|
|
return false;
|
|
if (nBegin > vch.size())
|
|
nBegin = vch.size();
|
|
if (nEnd > vch.size())
|
|
nEnd = vch.size();
|
|
vch.erase(vch.begin() + nEnd, vch.end());
|
|
vch.erase(vch.begin(), vch.begin() + nBegin);
|
|
popstack(stack);
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_LEFT:
|
|
case OP_RIGHT:
|
|
{
|
|
// (in size -- out)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype& vch = stacktop(-2);
|
|
int nSize = CastToBigNum(stacktop(-1)).getint();
|
|
if (nSize < 0)
|
|
return false;
|
|
if (nSize > vch.size())
|
|
nSize = vch.size();
|
|
if (opcode == OP_LEFT)
|
|
vch.erase(vch.begin() + nSize, vch.end());
|
|
else
|
|
vch.erase(vch.begin(), vch.end() - nSize);
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_SIZE:
|
|
{
|
|
// (in -- in size)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
CBigNum bn(stacktop(-1).size());
|
|
stack.push_back(bn.getvch());
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Bitwise logic
|
|
//
|
|
case OP_INVERT:
|
|
{
|
|
// (in - out)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype& vch = stacktop(-1);
|
|
for (int i = 0; i < vch.size(); i++)
|
|
vch[i] = ~vch[i];
|
|
}
|
|
break;
|
|
|
|
case OP_AND:
|
|
case OP_OR:
|
|
case OP_XOR:
|
|
{
|
|
// (x1 x2 - out)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype& vch1 = stacktop(-2);
|
|
valtype& vch2 = stacktop(-1);
|
|
MakeSameSize(vch1, vch2);
|
|
if (opcode == OP_AND)
|
|
{
|
|
for (int i = 0; i < vch1.size(); i++)
|
|
vch1[i] &= vch2[i];
|
|
}
|
|
else if (opcode == OP_OR)
|
|
{
|
|
for (int i = 0; i < vch1.size(); i++)
|
|
vch1[i] |= vch2[i];
|
|
}
|
|
else if (opcode == OP_XOR)
|
|
{
|
|
for (int i = 0; i < vch1.size(); i++)
|
|
vch1[i] ^= vch2[i];
|
|
}
|
|
popstack(stack);
|
|
}
|
|
break;
|
|
|
|
case OP_EQUAL:
|
|
case OP_EQUALVERIFY:
|
|
//case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
|
|
{
|
|
// (x1 x2 - bool)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
valtype& vch1 = stacktop(-2);
|
|
valtype& vch2 = stacktop(-1);
|
|
bool fEqual = (vch1 == vch2);
|
|
// OP_NOTEQUAL is disabled because it would be too easy to say
|
|
// something like n != 1 and have some wiseguy pass in 1 with extra
|
|
// zero bytes after it (numerically, 0x01 == 0x0001 == 0x000001)
|
|
//if (opcode == OP_NOTEQUAL)
|
|
// fEqual = !fEqual;
|
|
popstack(stack);
|
|
popstack(stack);
|
|
stack.push_back(fEqual ? vchTrue : vchFalse);
|
|
if (opcode == OP_EQUALVERIFY)
|
|
{
|
|
if (fEqual)
|
|
popstack(stack);
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Numeric
|
|
//
|
|
case OP_1ADD:
|
|
case OP_1SUB:
|
|
case OP_2MUL:
|
|
case OP_2DIV:
|
|
case OP_NEGATE:
|
|
case OP_ABS:
|
|
case OP_NOT:
|
|
case OP_0NOTEQUAL:
|
|
{
|
|
// (in -- out)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
CBigNum bn = CastToBigNum(stacktop(-1));
|
|
switch (opcode)
|
|
{
|
|
case OP_1ADD: bn += bnOne; break;
|
|
case OP_1SUB: bn -= bnOne; break;
|
|
case OP_2MUL: bn <<= 1; break;
|
|
case OP_2DIV: bn >>= 1; break;
|
|
case OP_NEGATE: bn = -bn; break;
|
|
case OP_ABS: if (bn < bnZero) bn = -bn; break;
|
|
case OP_NOT: bn = (bn == bnZero); break;
|
|
case OP_0NOTEQUAL: bn = (bn != bnZero); break;
|
|
}
|
|
popstack(stack);
|
|
stack.push_back(bn.getvch());
|
|
}
|
|
break;
|
|
|
|
case OP_ADD:
|
|
case OP_SUB:
|
|
case OP_MUL:
|
|
case OP_DIV:
|
|
case OP_MOD:
|
|
case OP_LSHIFT:
|
|
case OP_RSHIFT:
|
|
case OP_BOOLAND:
|
|
case OP_BOOLOR:
|
|
case OP_NUMEQUAL:
|
|
case OP_NUMEQUALVERIFY:
|
|
case OP_NUMNOTEQUAL:
|
|
case OP_LESSTHAN:
|
|
case OP_GREATERTHAN:
|
|
case OP_LESSTHANOREQUAL:
|
|
case OP_GREATERTHANOREQUAL:
|
|
case OP_MIN:
|
|
case OP_MAX:
|
|
{
|
|
// (x1 x2 -- out)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
CBigNum bn1 = CastToBigNum(stacktop(-2));
|
|
CBigNum bn2 = CastToBigNum(stacktop(-1));
|
|
CBigNum bn;
|
|
switch (opcode)
|
|
{
|
|
case OP_ADD:
|
|
bn = bn1 + bn2;
|
|
break;
|
|
|
|
case OP_SUB:
|
|
bn = bn1 - bn2;
|
|
break;
|
|
|
|
case OP_MUL:
|
|
if (!BN_mul(&bn, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_DIV:
|
|
if (!BN_div(&bn, NULL, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_MOD:
|
|
if (!BN_mod(&bn, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_LSHIFT:
|
|
if (bn2 < bnZero || bn2 > CBigNum(2048))
|
|
return false;
|
|
bn = bn1 << bn2.getulong();
|
|
break;
|
|
|
|
case OP_RSHIFT:
|
|
if (bn2 < bnZero || bn2 > CBigNum(2048))
|
|
return false;
|
|
bn = bn1 >> bn2.getulong();
|
|
break;
|
|
|
|
case OP_BOOLAND: bn = (bn1 != bnZero && bn2 != bnZero); break;
|
|
case OP_BOOLOR: bn = (bn1 != bnZero || bn2 != bnZero); break;
|
|
case OP_NUMEQUAL: bn = (bn1 == bn2); break;
|
|
case OP_NUMEQUALVERIFY: bn = (bn1 == bn2); break;
|
|
case OP_NUMNOTEQUAL: bn = (bn1 != bn2); break;
|
|
case OP_LESSTHAN: bn = (bn1 < bn2); break;
|
|
case OP_GREATERTHAN: bn = (bn1 > bn2); break;
|
|
case OP_LESSTHANOREQUAL: bn = (bn1 <= bn2); break;
|
|
case OP_GREATERTHANOREQUAL: bn = (bn1 >= bn2); break;
|
|
case OP_MIN: bn = (bn1 < bn2 ? bn1 : bn2); break;
|
|
case OP_MAX: bn = (bn1 > bn2 ? bn1 : bn2); break;
|
|
}
|
|
popstack(stack);
|
|
popstack(stack);
|
|
stack.push_back(bn.getvch());
|
|
|
|
if (opcode == OP_NUMEQUALVERIFY)
|
|
{
|
|
if (CastToBool(stacktop(-1)))
|
|
popstack(stack);
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case OP_WITHIN:
|
|
{
|
|
// (x min max -- out)
|
|
if (stack.size() < 3)
|
|
return false;
|
|
CBigNum bn1 = CastToBigNum(stacktop(-3));
|
|
CBigNum bn2 = CastToBigNum(stacktop(-2));
|
|
CBigNum bn3 = CastToBigNum(stacktop(-1));
|
|
bool fValue = (bn2 <= bn1 && bn1 < bn3);
|
|
popstack(stack);
|
|
popstack(stack);
|
|
popstack(stack);
|
|
stack.push_back(fValue ? vchTrue : vchFalse);
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Crypto
|
|
//
|
|
case OP_RIPEMD160:
|
|
case OP_SHA1:
|
|
case OP_SHA256:
|
|
case OP_HASH160:
|
|
case OP_HASH256:
|
|
{
|
|
// (in -- hash)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype& vch = stacktop(-1);
|
|
valtype vchHash((opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160) ? 20 : 32);
|
|
if (opcode == OP_RIPEMD160)
|
|
RIPEMD160(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_SHA1)
|
|
SHA1(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_SHA256)
|
|
SHA256(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_HASH160)
|
|
{
|
|
uint160 hash160 = Hash160(vch);
|
|
memcpy(&vchHash[0], &hash160, sizeof(hash160));
|
|
}
|
|
else if (opcode == OP_HASH256)
|
|
{
|
|
uint256 hash = Hash(vch.begin(), vch.end());
|
|
memcpy(&vchHash[0], &hash, sizeof(hash));
|
|
}
|
|
popstack(stack);
|
|
stack.push_back(vchHash);
|
|
}
|
|
break;
|
|
|
|
case OP_CODESEPARATOR:
|
|
{
|
|
// Hash starts after the code separator
|
|
pbegincodehash = pc;
|
|
}
|
|
break;
|
|
|
|
case OP_CHECKSIG:
|
|
case OP_CHECKSIGVERIFY:
|
|
{
|
|
// (sig pubkey -- bool)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
|
|
valtype& vchSig = stacktop(-2);
|
|
valtype& vchPubKey = stacktop(-1);
|
|
|
|
////// debug print
|
|
//PrintHex(vchSig.begin(), vchSig.end(), "sig: %s\n");
|
|
//PrintHex(vchPubKey.begin(), vchPubKey.end(), "pubkey: %s\n");
|
|
|
|
// Subset of script starting at the most recent codeseparator
|
|
CScript scriptCode(pbegincodehash, pend);
|
|
|
|
// Drop the signature, since there's no way for a signature to sign itself
|
|
scriptCode.FindAndDelete(CScript(vchSig));
|
|
|
|
bool fSuccess = CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType);
|
|
|
|
popstack(stack);
|
|
popstack(stack);
|
|
stack.push_back(fSuccess ? vchTrue : vchFalse);
|
|
if (opcode == OP_CHECKSIGVERIFY)
|
|
{
|
|
if (fSuccess)
|
|
popstack(stack);
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case OP_CHECKMULTISIG:
|
|
case OP_CHECKMULTISIGVERIFY:
|
|
{
|
|
// ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
|
|
|
|
int i = 1;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
int nKeysCount = CastToBigNum(stacktop(-i)).getint();
|
|
if (nKeysCount < 0)
|
|
return false;
|
|
if (nBestHeight > 84000)
|
|
{
|
|
if (nKeysCount > 20)
|
|
return false;
|
|
nOpCount += nKeysCount;
|
|
if (nOpCount > 201)
|
|
return false;
|
|
}
|
|
int ikey = ++i;
|
|
i += nKeysCount;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
int nSigsCount = CastToBigNum(stacktop(-i)).getint();
|
|
if (nSigsCount < 0 || nSigsCount > nKeysCount)
|
|
return false;
|
|
int isig = ++i;
|
|
i += nSigsCount;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
// Subset of script starting at the most recent codeseparator
|
|
CScript scriptCode(pbegincodehash, pend);
|
|
|
|
// Drop the signatures, since there's no way for a signature to sign itself
|
|
for (int k = 0; k < nSigsCount; k++)
|
|
{
|
|
valtype& vchSig = stacktop(-isig-k);
|
|
scriptCode.FindAndDelete(CScript(vchSig));
|
|
}
|
|
|
|
bool fSuccess = true;
|
|
while (fSuccess && nSigsCount > 0)
|
|
{
|
|
valtype& vchSig = stacktop(-isig);
|
|
valtype& vchPubKey = stacktop(-ikey);
|
|
|
|
// Check signature
|
|
if (CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
|
|
{
|
|
isig++;
|
|
nSigsCount--;
|
|
}
|
|
ikey++;
|
|
nKeysCount--;
|
|
|
|
// If there are more signatures left than keys left,
|
|
// then too many signatures have failed
|
|
if (nSigsCount > nKeysCount)
|
|
fSuccess = false;
|
|
}
|
|
|
|
while (i-- > 0)
|
|
popstack(stack);
|
|
stack.push_back(fSuccess ? vchTrue : vchFalse);
|
|
|
|
if (opcode == OP_CHECKMULTISIGVERIFY)
|
|
{
|
|
if (fSuccess)
|
|
popstack(stack);
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
// Size limits
|
|
if (stack.size() + altstack.size() > 1000)
|
|
return false;
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
|
|
if (!vfExec.empty())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
if (nIn >= txTo.vin.size())
|
|
{
|
|
printf("ERROR: SignatureHash() : nIn=%d out of range\n", nIn);
|
|
return 1;
|
|
}
|
|
CTransaction txTmp(txTo);
|
|
|
|
// In case concatenating two scripts ends up with two codeseparators,
|
|
// or an extra one at the end, this prevents all those possible incompatibilities.
|
|
scriptCode.FindAndDelete(CScript(OP_CODESEPARATOR));
|
|
|
|
// Blank out other inputs' signatures
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
txTmp.vin[i].scriptSig = CScript();
|
|
txTmp.vin[nIn].scriptSig = scriptCode;
|
|
|
|
// Blank out some of the outputs
|
|
if ((nHashType & 0x1f) == SIGHASH_NONE)
|
|
{
|
|
// Wildcard payee
|
|
txTmp.vout.clear();
|
|
|
|
// Let the others update at will
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
if (i != nIn)
|
|
txTmp.vin[i].nSequence = 0;
|
|
}
|
|
else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
|
|
{
|
|
// Only lockin the txout payee at same index as txin
|
|
unsigned int nOut = nIn;
|
|
if (nOut >= txTmp.vout.size())
|
|
{
|
|
printf("ERROR: SignatureHash() : nOut=%d out of range\n", nOut);
|
|
return 1;
|
|
}
|
|
txTmp.vout.resize(nOut+1);
|
|
for (int i = 0; i < nOut; i++)
|
|
txTmp.vout[i].SetNull();
|
|
|
|
// Let the others update at will
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
if (i != nIn)
|
|
txTmp.vin[i].nSequence = 0;
|
|
}
|
|
|
|
// Blank out other inputs completely, not recommended for open transactions
|
|
if (nHashType & SIGHASH_ANYONECANPAY)
|
|
{
|
|
txTmp.vin[0] = txTmp.vin[nIn];
|
|
txTmp.vin.resize(1);
|
|
}
|
|
|
|
// Serialize and hash
|
|
CDataStream ss(SER_GETHASH);
|
|
ss.reserve(10000);
|
|
ss << txTmp << nHashType;
|
|
return Hash(ss.begin(), ss.end());
|
|
}
|
|
|
|
|
|
bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode,
|
|
const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
CKey key;
|
|
if (!key.SetPubKey(vchPubKey))
|
|
return false;
|
|
|
|
// Hash type is one byte tacked on to the end of the signature
|
|
if (vchSig.empty())
|
|
return false;
|
|
if (nHashType == 0)
|
|
nHashType = vchSig.back();
|
|
else if (nHashType != vchSig.back())
|
|
return false;
|
|
vchSig.pop_back();
|
|
|
|
return key.Verify(SignatureHash(scriptCode, txTo, nIn, nHashType), vchSig);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
bool Solver(const CScript& scriptPubKey, vector<pair<opcodetype, valtype> >& vSolutionRet)
|
|
{
|
|
// Templates
|
|
static vector<CScript> vTemplates;
|
|
if (vTemplates.empty())
|
|
{
|
|
// Standard tx, sender provides pubkey, receiver adds signature
|
|
vTemplates.push_back(CScript() << OP_PUBKEY << OP_CHECKSIG);
|
|
|
|
// Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
|
|
vTemplates.push_back(CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG);
|
|
}
|
|
|
|
// Scan templates
|
|
const CScript& script1 = scriptPubKey;
|
|
foreach(const CScript& script2, vTemplates)
|
|
{
|
|
vSolutionRet.clear();
|
|
opcodetype opcode1, opcode2;
|
|
vector<unsigned char> vch1, vch2;
|
|
|
|
// Compare
|
|
CScript::const_iterator pc1 = script1.begin();
|
|
CScript::const_iterator pc2 = script2.begin();
|
|
loop
|
|
{
|
|
if (pc1 == script1.end() && pc2 == script2.end())
|
|
{
|
|
// Found a match
|
|
reverse(vSolutionRet.begin(), vSolutionRet.end());
|
|
return true;
|
|
}
|
|
if (!script1.GetOp(pc1, opcode1, vch1))
|
|
break;
|
|
if (!script2.GetOp(pc2, opcode2, vch2))
|
|
break;
|
|
if (opcode2 == OP_PUBKEY)
|
|
{
|
|
if (vch1.size() < 33)
|
|
break;
|
|
vSolutionRet.push_back(make_pair(opcode2, vch1));
|
|
}
|
|
else if (opcode2 == OP_PUBKEYHASH)
|
|
{
|
|
if (vch1.size() != sizeof(uint160))
|
|
break;
|
|
vSolutionRet.push_back(make_pair(opcode2, vch1));
|
|
}
|
|
else if (opcode1 != opcode2 || vch1 != vch2)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
vSolutionRet.clear();
|
|
return false;
|
|
}
|
|
|
|
|
|
bool Solver(const CScript& scriptPubKey, uint256 hash, int nHashType, CScript& scriptSigRet)
|
|
{
|
|
scriptSigRet.clear();
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
// Compile solution
|
|
CRITICAL_BLOCK(cs_mapKeys)
|
|
{
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
if (item.first == OP_PUBKEY)
|
|
{
|
|
// Sign
|
|
const valtype& vchPubKey = item.second;
|
|
if (!mapKeys.count(vchPubKey))
|
|
return false;
|
|
if (hash != 0)
|
|
{
|
|
vector<unsigned char> vchSig;
|
|
if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
|
|
return false;
|
|
vchSig.push_back((unsigned char)nHashType);
|
|
scriptSigRet << vchSig;
|
|
}
|
|
}
|
|
else if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
// Sign and give pubkey
|
|
map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
|
|
if (mi == mapPubKeys.end())
|
|
return false;
|
|
const vector<unsigned char>& vchPubKey = (*mi).second;
|
|
if (!mapKeys.count(vchPubKey))
|
|
return false;
|
|
if (hash != 0)
|
|
{
|
|
vector<unsigned char> vchSig;
|
|
if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
|
|
return false;
|
|
vchSig.push_back((unsigned char)nHashType);
|
|
scriptSigRet << vchSig << vchPubKey;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool IsMine(const CScript& scriptPubKey)
|
|
{
|
|
CScript scriptSig;
|
|
return Solver(scriptPubKey, 0, 0, scriptSig);
|
|
}
|
|
|
|
|
|
bool ExtractPubKey(const CScript& scriptPubKey, bool fMineOnly, vector<unsigned char>& vchPubKeyRet)
|
|
{
|
|
vchPubKeyRet.clear();
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
CRITICAL_BLOCK(cs_mapKeys)
|
|
{
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
valtype vchPubKey;
|
|
if (item.first == OP_PUBKEY)
|
|
{
|
|
vchPubKey = item.second;
|
|
}
|
|
else if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
|
|
if (mi == mapPubKeys.end())
|
|
continue;
|
|
vchPubKey = (*mi).second;
|
|
}
|
|
if (!fMineOnly || mapKeys.count(vchPubKey))
|
|
{
|
|
vchPubKeyRet = vchPubKey;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool ExtractHash160(const CScript& scriptPubKey, uint160& hash160Ret)
|
|
{
|
|
hash160Ret = 0;
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
hash160Ret = uint160(item.second);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
vector<vector<unsigned char> > stack;
|
|
if (!EvalScript(stack, scriptSig, txTo, nIn, nHashType))
|
|
return false;
|
|
if (!EvalScript(stack, scriptPubKey, txTo, nIn, nHashType))
|
|
return false;
|
|
if (stack.empty())
|
|
return false;
|
|
return CastToBool(stack.back());
|
|
}
|
|
|
|
|
|
bool SignSignature(const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType, CScript scriptPrereq)
|
|
{
|
|
assert(nIn < txTo.vin.size());
|
|
CTxIn& txin = txTo.vin[nIn];
|
|
assert(txin.prevout.n < txFrom.vout.size());
|
|
const CTxOut& txout = txFrom.vout[txin.prevout.n];
|
|
|
|
// Leave out the signature from the hash, since a signature can't sign itself.
|
|
// The checksig op will also drop the signatures from its hash.
|
|
uint256 hash = SignatureHash(scriptPrereq + txout.scriptPubKey, txTo, nIn, nHashType);
|
|
|
|
if (!Solver(txout.scriptPubKey, hash, nHashType, txin.scriptSig))
|
|
return false;
|
|
|
|
txin.scriptSig = scriptPrereq + txin.scriptSig;
|
|
|
|
// Test solution
|
|
if (scriptPrereq.empty())
|
|
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, 0))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
assert(nIn < txTo.vin.size());
|
|
const CTxIn& txin = txTo.vin[nIn];
|
|
if (txin.prevout.n >= txFrom.vout.size())
|
|
return false;
|
|
const CTxOut& txout = txFrom.vout[txin.prevout.n];
|
|
|
|
if (txin.prevout.hash != txFrom.GetHash())
|
|
return false;
|
|
|
|
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nHashType))
|
|
return false;
|
|
|
|
// Anytime a signature is successfully verified, it's proof the outpoint is spent,
|
|
// so lets update the wallet spent flag if it doesn't know due to wallet.dat being
|
|
// restored from backup or the user making copies of wallet.dat.
|
|
WalletUpdateSpent(txin.prevout);
|
|
|
|
return true;
|
|
}
|