diff options
Diffstat (limited to 'script.cpp')
| -rw-r--r-- | script.cpp | 1314 |
1 files changed, 671 insertions, 643 deletions
diff --git a/script.cpp b/script.cpp index 98f5afd5a7..2b692caf42 100644 --- a/script.cpp +++ b/script.cpp @@ -16,6 +16,7 @@ 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 = 258;
bool CastToBool(const valtype& vch)
@@ -53,752 +54,779 @@ bool EvalScript(const CScript& script, const CTransaction& txTo, unsigned int nI vector<valtype> altstack;
if (pvStackRet)
pvStackRet->clear();
+ if (script.size() > 20000)
+ return false;
- while (pc < pend)
+ try
{
- bool fExec = !count(vfExec.begin(), vfExec.end(), false);
-
- //
- // Read instruction
- //
- opcodetype opcode;
- valtype vchPushValue;
- if (!script.GetOp(pc, opcode, vchPushValue))
- return false;
-
- if (fExec && opcode <= OP_PUSHDATA4)
- stack.push_back(vchPushValue);
- else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
- switch (opcode)
+ while (pc < pend)
{
- //
- // 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;
-
+ bool fExec = !count(vfExec.begin(), vfExec.end(), false);
//
- // Control
+ // Read instruction
//
- case OP_NOP:
- break;
-
- case OP_VER:
- {
- CBigNum bn(VERSION);
- stack.push_back(bn.getvch());
- }
- break;
+ opcodetype opcode;
+ valtype vchPushValue;
+ if (!script.GetOp(pc, opcode, vchPushValue))
+ return false;
+ if (vchPushValue.size() > 5000)
+ return false;
- case OP_IF:
- case OP_NOTIF:
- case OP_VERIF:
- case OP_VERNOTIF:
+ if (fExec && opcode <= OP_PUSHDATA4)
+ stack.push_back(vchPushValue);
+ else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
+ switch (opcode)
{
- // <expression> if [statements] [else [statements]] endif
- bool fValue = false;
- if (fExec)
+ //
+ // 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:
{
- if (stack.size() < 1)
- return false;
- valtype& vch = stacktop(-1);
- if (opcode == OP_VERIF || opcode == OP_VERNOTIF)
- fValue = (CBigNum(VERSION) >= CBigNum(vch));
- else
- fValue = CastToBool(vch);
- if (opcode == OP_NOTIF || opcode == OP_VERNOTIF)
- fValue = !fValue;
- stack.pop_back();
+ // ( -- value)
+ CBigNum bn((int)opcode - (int)(OP_1 - 1));
+ stack.push_back(bn.getvch());
}
- 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)
- stack.pop_back();
- else
- pc = pend;
- }
- break;
-
- case OP_RETURN:
- {
- pc = pend;
- }
- break;
+ break;
- //
- // Stack ops
- //
- case OP_TOALTSTACK:
- {
- if (stack.size() < 1)
- return false;
- altstack.push_back(stacktop(-1));
- stack.pop_back();
- }
- 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_FROMALTSTACK:
- {
- if (altstack.size() < 1)
+ case OP_VER:
+ case OP_VERIF:
+ case OP_VERNOTIF:
+ {
return false;
- stack.push_back(altstacktop(-1));
- altstack.pop_back();
- }
- break;
+ }
+ break;
- case OP_2DROP:
- {
- // (x1 x2 -- )
- stack.pop_back();
- stack.pop_back();
- }
- 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;
+ stack.pop_back();
+ }
+ vfExec.push_back(fValue);
+ }
+ 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_ELSE:
+ {
+ if (vfExec.empty())
+ return false;
+ vfExec.back() = !vfExec.back();
+ }
+ 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_ENDIF:
+ {
+ if (vfExec.empty())
+ return false;
+ vfExec.pop_back();
+ }
+ 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_VERIFY:
+ {
+ // (true -- ) or
+ // (false -- false) and return
+ if (stack.size() < 1)
+ return false;
+ bool fValue = CastToBool(stacktop(-1));
+ if (fValue)
+ stack.pop_back();
+ else
+ return false;
+ }
+ break;
- case OP_2ROT:
- {
- // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
- if (stack.size() < 6)
+ case OP_RETURN:
+ {
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;
+ }
+ 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;
+ //
+ // Stack ops
+ //
+ case OP_TOALTSTACK:
+ {
+ if (stack.size() < 1)
+ return false;
+ altstack.push_back(stacktop(-1));
+ stack.pop_back();
+ }
+ break;
- case OP_DEPTH:
- {
- // -- stacksize
- CBigNum bn(stack.size());
- stack.push_back(bn.getvch());
- }
- break;
+ case OP_FROMALTSTACK:
+ {
+ if (altstack.size() < 1)
+ return false;
+ stack.push_back(altstacktop(-1));
+ altstack.pop_back();
+ }
+ break;
- case OP_DROP:
- {
- // (x -- )
- if (stack.size() < 1)
- return false;
- stack.pop_back();
- }
- break;
+ case OP_2DROP:
+ {
+ // (x1 x2 -- )
+ stack.pop_back();
+ stack.pop_back();
+ }
+ break;
- case OP_DUP:
- {
- // (x -- x x)
- if (stack.size() < 1)
- return false;
- valtype vch = stacktop(-1);
- stack.push_back(vch);
- }
- 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_NIP:
- {
- // (x1 x2 -- x2)
- if (stack.size() < 2)
- return false;
- stack.erase(stack.end() - 2);
- }
- 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_OVER:
- {
- // (x1 x2 -- x1 x2 x1)
- if (stack.size() < 2)
- return false;
- valtype vch = stacktop(-2);
- stack.push_back(vch);
- }
- 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_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 = CBigNum(stacktop(-1)).getint();
- stack.pop_back();
- 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_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_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_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_SWAP:
- {
- // (x1 x2 -- x2 x1)
- if (stack.size() < 2)
- return false;
- swap(stacktop(-2), 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_TUCK:
- {
- // (x1 x2 -- x2 x1 x2)
- if (stack.size() < 2)
- return false;
- valtype vch = stacktop(-1);
- stack.insert(stack.end()-2, 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;
+ stack.pop_back();
+ }
+ 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());
- stack.pop_back();
- }
- break;
+ case OP_DUP:
+ {
+ // (x -- x x)
+ if (stack.size() < 1)
+ return false;
+ valtype vch = stacktop(-1);
+ stack.push_back(vch);
+ }
+ break;
- case OP_SUBSTR:
- {
- // (in begin size -- out)
- if (stack.size() < 3)
- return false;
- valtype& vch = stacktop(-3);
- int nBegin = CBigNum(stacktop(-2)).getint();
- int nEnd = nBegin + CBigNum(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);
- stack.pop_back();
- stack.pop_back();
- }
- break;
+ case OP_NIP:
+ {
+ // (x1 x2 -- x2)
+ if (stack.size() < 2)
+ return false;
+ stack.erase(stack.end() - 2);
+ }
+ break;
- case OP_LEFT:
- case OP_RIGHT:
- {
- // (in size -- out)
- if (stack.size() < 2)
- return false;
- valtype& vch = stacktop(-2);
- int nSize = CBigNum(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);
- stack.pop_back();
- }
- 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_SIZE:
- {
- // (in -- in size)
- if (stack.size() < 1)
- return false;
- CBigNum bn(stacktop(-1).size());
- stack.push_back(bn.getvch());
- }
- 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 = CBigNum(stacktop(-1)).getint();
+ stack.pop_back();
+ 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;
- //
- // 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_SWAP:
+ {
+ // (x1 x2 -- x2 x1)
+ if (stack.size() < 2)
+ return false;
+ swap(stacktop(-2), stacktop(-1));
+ }
+ 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)
+ case OP_TUCK:
{
- for (int i = 0; i < vch1.size(); i++)
- vch1[i] &= vch2[i];
+ // (x1 x2 -- x2 x1 x2)
+ if (stack.size() < 2)
+ return false;
+ valtype vch = stacktop(-1);
+ stack.insert(stack.end()-2, vch);
}
- else if (opcode == OP_OR)
+ break;
+
+
+ //
+ // Splice ops
+ //
+ case OP_CAT:
{
- for (int i = 0; i < vch1.size(); i++)
- vch1[i] |= vch2[i];
+ // (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());
+ stack.pop_back();
+ if (stacktop(-1).size() > 5000)
+ return false;
}
- else if (opcode == OP_XOR)
+ break;
+
+ case OP_SUBSTR:
{
- for (int i = 0; i < vch1.size(); i++)
- vch1[i] ^= vch2[i];
+ // (in begin size -- out)
+ if (stack.size() < 3)
+ return false;
+ valtype& vch = stacktop(-3);
+ int nBegin = CBigNum(stacktop(-2)).getint();
+ int nEnd = nBegin + CBigNum(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);
+ stack.pop_back();
+ stack.pop_back();
}
- stack.pop_back();
- }
- break;
+ 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;
- stack.pop_back();
- stack.pop_back();
- stack.push_back(fEqual ? vchTrue : vchFalse);
- if (opcode == OP_EQUALVERIFY)
+ case OP_LEFT:
+ case OP_RIGHT:
{
- if (fEqual)
- stack.pop_back();
+ // (in size -- out)
+ if (stack.size() < 2)
+ return false;
+ valtype& vch = stacktop(-2);
+ int nSize = CBigNum(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
- pc = pend;
+ vch.erase(vch.begin(), vch.end() - nSize);
+ stack.pop_back();
}
- }
- break;
-
+ 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(stacktop(-1));
- switch (opcode)
+ case OP_SIZE:
{
- 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;
+ // (in -- in size)
+ if (stack.size() < 1)
+ return false;
+ CBigNum bn(stacktop(-1).size());
+ stack.push_back(bn.getvch());
}
- stack.pop_back();
- 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(stacktop(-2));
- CBigNum bn2(stacktop(-1));
- CBigNum bn;
- switch (opcode)
- {
- case OP_ADD:
- bn = bn1 + bn2;
- break;
+ break;
- case OP_SUB:
- bn = bn1 - bn2;
- break;
- case OP_MUL:
- if (!BN_mul(&bn, &bn1, &bn2, pctx))
+ //
+ // Bitwise logic
+ //
+ case OP_INVERT:
+ {
+ // (in - out)
+ if (stack.size() < 1)
return false;
- break;
+ valtype& vch = stacktop(-1);
+ for (int i = 0; i < vch.size(); i++)
+ vch[i] = ~vch[i];
+ }
+ break;
- case OP_DIV:
- if (!BN_div(&bn, NULL, &bn1, &bn2, pctx))
+ case OP_AND:
+ case OP_OR:
+ case OP_XOR:
+ {
+ // (x1 x2 - out)
+ if (stack.size() < 2)
return false;
- break;
+ 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];
+ }
+ stack.pop_back();
+ }
+ break;
- case OP_MOD:
- if (!BN_mod(&bn, &bn1, &bn2, pctx))
+ case OP_EQUAL:
+ case OP_EQUALVERIFY:
+ //case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
+ {
+ // (x1 x2 - bool)
+ if (stack.size() < 2)
return false;
- break;
+ 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;
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fEqual ? vchTrue : vchFalse);
+ if (opcode == OP_EQUALVERIFY)
+ {
+ if (fEqual)
+ stack.pop_back();
+ else
+ return false;
+ }
+ }
+ break;
- case OP_LSHIFT:
- if (bn2 < bnZero)
+
+ //
+ // 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;
- bn = bn1 << bn2.getulong();
- break;
+ if (stacktop(-1).size() > nMaxNumSize)
+ return false;
+ CBigNum bn(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;
+ }
+ stack.pop_back();
+ 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:
- if (bn2 < bnZero)
+ 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;
- bn = bn1 >> bn2.getulong();
- break;
+ if (stacktop(-2).size() > nMaxNumSize ||
+ stacktop(-1).size() > nMaxNumSize)
+ return false;
+ CBigNum bn1(stacktop(-2));
+ CBigNum bn2(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;
+ }
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(bn.getvch());
- 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;
+ if (opcode == OP_NUMEQUALVERIFY)
+ {
+ if (CastToBool(stacktop(-1)))
+ stack.pop_back();
+ else
+ return false;
+ }
}
- stack.pop_back();
- stack.pop_back();
- stack.push_back(bn.getvch());
+ break;
- if (opcode == OP_NUMEQUALVERIFY)
+ case OP_WITHIN:
{
- if (CastToBool(stacktop(-1)))
- stack.pop_back();
- else
- pc = pend;
+ // (x min max -- out)
+ if (stack.size() < 3)
+ return false;
+ if (stacktop(-3).size() > nMaxNumSize ||
+ stacktop(-2).size() > nMaxNumSize ||
+ stacktop(-1).size() > nMaxNumSize)
+ return false;
+ CBigNum bn1(stacktop(-3));
+ CBigNum bn2(stacktop(-2));
+ CBigNum bn3(stacktop(-1));
+ bool fValue = (bn2 <= bn1 && bn1 < bn3);
+ stack.pop_back();
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fValue ? vchTrue : vchFalse);
}
- }
- break;
-
- case OP_WITHIN:
- {
- // (x min max -- out)
- if (stack.size() < 3)
- return false;
- CBigNum bn1(stacktop(-3));
- CBigNum bn2(stacktop(-2));
- CBigNum bn3(stacktop(-1));
- bool fValue = (bn2 <= bn1 && bn1 < bn3);
- stack.pop_back();
- stack.pop_back();
- stack.pop_back();
- stack.push_back(fValue ? vchTrue : vchFalse);
- }
- break;
+ 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)
+ //
+ // Crypto
+ //
+ case OP_RIPEMD160:
+ case OP_SHA1:
+ case OP_SHA256:
+ case OP_HASH160:
+ case OP_HASH256:
{
- uint160 hash160 = Hash160(vch);
- memcpy(&vchHash[0], &hash160, sizeof(hash160));
+ // (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));
+ }
+ stack.pop_back();
+ stack.push_back(vchHash);
}
- else if (opcode == OP_HASH256)
+ break;
+
+ case OP_CODESEPARATOR:
{
- uint256 hash = Hash(vch.begin(), vch.end());
- memcpy(&vchHash[0], &hash, sizeof(hash));
+ // Hash starts after the code separator
+ pbegincodehash = pc;
}
- stack.pop_back();
- stack.push_back(vchHash);
- }
- break;
+ 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;
- case OP_CHECKSIG:
- case OP_CHECKSIGVERIFY:
- {
- // (sig pubkey -- bool)
- if (stack.size() < 2)
- return false;
+ valtype& vchSig = stacktop(-2);
+ valtype& vchPubKey = stacktop(-1);
- 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");
- ////// 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);
- // 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));
- // 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);
- bool fSuccess = CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType);
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
+ if (opcode == OP_CHECKSIGVERIFY)
+ {
+ if (fSuccess)
+ stack.pop_back();
+ else
+ return false;
+ }
+ }
+ break;
- stack.pop_back();
- stack.pop_back();
- stack.push_back(fSuccess ? vchTrue : vchFalse);
- if (opcode == OP_CHECKSIGVERIFY)
+ case OP_CHECKMULTISIG:
+ case OP_CHECKMULTISIGVERIFY:
{
- if (fSuccess)
- stack.pop_back();
- else
- pc = pend;
- }
- }
- break;
+ // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
- 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 i = 1;
- if (stack.size() < i)
- return false;
+ int nKeysCount = CBigNum(stacktop(-i)).getint();
+ if (nKeysCount < 0)
+ return false;
+ int ikey = ++i;
+ i += nKeysCount;
+ if (stack.size() < i)
+ return false;
- int nKeysCount = CBigNum(stacktop(-i)).getint();
- if (nKeysCount < 0)
- return false;
- int ikey = ++i;
- i += nKeysCount;
- if (stack.size() < i)
- return false;
+ int nSigsCount = CBigNum(stacktop(-i)).getint();
+ if (nSigsCount < 0 || nSigsCount > nKeysCount)
+ return false;
+ int isig = ++i;
+ i += nSigsCount;
+ if (stack.size() < i)
+ return false;
- int nSigsCount = CBigNum(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);
- // 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));
+ }
- // 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;
+ }
- bool fSuccess = true;
- while (fSuccess && nSigsCount > 0)
- {
- valtype& vchSig = stacktop(-isig);
- valtype& vchPubKey = stacktop(-ikey);
+ while (i-- > 0)
+ stack.pop_back();
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
- // Check signature
- if (CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
+ if (opcode == OP_CHECKMULTISIGVERIFY)
{
- isig++;
- nSigsCount--;
+ if (fSuccess)
+ stack.pop_back();
+ else
+ return false;
}
- ikey++;
- nKeysCount--;
-
- // If there are more signatures left than keys left,
- // then too many signatures have failed
- if (nSigsCount > nKeysCount)
- fSuccess = false;
}
+ break;
- while (i-- > 0)
- stack.pop_back();
- stack.push_back(fSuccess ? vchTrue : vchFalse);
-
- if (opcode == OP_CHECKMULTISIGVERIFY)
- {
- if (fSuccess)
- stack.pop_back();
- else
- pc = pend;
- }
+ default:
+ return false;
}
- break;
- default:
+ // Size limits
+ if (stack.size() + altstack.size() > 1000)
return false;
}
}
+ catch (...)
+ {
+ return false;
+ }
+
+ if (!vfExec.empty())
+ return false;
if (pvStackRet)
*pvStackRet = stack;
|