/// Remove last element from stack
/// </summary>
/// <param name="stack">Stack reference</param>
- static void popstack(ref List<IEnumerable<byte>> stack)
+ private static void popstack(ref List<IEnumerable<byte>> stack)
{
int nCount = stack.Count;
if (nCount == 0)
/// <param name="stack">Stack reference</param>
/// <param name="nDepth">Depth</param>
/// <returns>Byte sequence</returns>
- static IEnumerable<byte> stacktop(ref List<IEnumerable<byte>> stack, int nDepth)
+ private static IEnumerable<byte> stacktop(ref List<IEnumerable<byte>> stack, int nDepth)
{
int nStackElement = stack.Count + nDepth;
/// <param name="flags">Signature checking flags</param>
/// <param name="nHashType">Hash type flag</param>
/// <returns></returns>
- static bool EvalScript(ref List<IEnumerable<byte>> stack, CScript script, CTransaction txTo, int nIn, int flags, int nHashType)
+ public static bool EvalScript(ref List<IEnumerable<byte>> stack, CScript script, CTransaction txTo, int nIn, int flags, int nHashType)
{
- instruction opcode;
-
- ByteQueue CodeQueue = script.GetByteQUeue();
-
- List<bool> vfExec = new List<bool>();
- List<IEnumerable<byte>> altStack = new List<IEnumerable<byte>>();
-
- byte[] falseBytes = new byte[0];
- byte[] trueBytes = new byte[] { 0x01 };
-
if (script.Bytes.Count() > 10000)
{
return false; // Size limit failed
}
+ List<bool> vfExec = new List<bool>();
+
int nOpCount = 0;
int nCodeHashBegin = 0;
- IEnumerable<byte> pushArg;
+ byte[] falseBytes = new byte[0];
+ byte[] trueBytes = new byte[] { 0x01 };
- while (GetOp(ref CodeQueue, out opcode, out pushArg)) // Read instructions
+ ByteQueue CodeQueue = script.GetByteQUeue();
+ List<IEnumerable<byte>> altStack = new List<IEnumerable<byte>>();
+
+ try
{
- bool fExec = vfExec.IndexOf(false) != -1;
+ instruction opcode;
+ IEnumerable<byte> pushArg;
- if (pushArg.Count() > 520)
+ while (GetOp(ref CodeQueue, out opcode, out pushArg)) // Read instructions
{
- return false; // Script element size limit failed
- }
+ bool fExec = vfExec.IndexOf(false) != -1;
- if (opcode > instruction.OP_16 && ++nOpCount > 201)
- {
- return false;
- }
+ if (pushArg.Count() > 520)
+ {
+ return false; // Script element size limit failed
+ }
- if (fExec && 0 <= opcode && opcode <= instruction.OP_PUSHDATA4)
- {
- stack.Add(pushArg); // Push argument to stack
- }
- else if (fExec || (instruction.OP_IF <= opcode && opcode <= instruction.OP_ENDIF))
- switch (opcode)
+ if (opcode > instruction.OP_16 && ++nOpCount > 201)
{
- //
- // Disabled opcodes
- //
- case instruction.OP_CAT:
- case instruction.OP_SUBSTR:
- case instruction.OP_LEFT:
- case instruction.OP_RIGHT:
- case instruction.OP_INVERT:
- case instruction.OP_AND:
- case instruction.OP_OR:
- case instruction.OP_XOR:
- case instruction.OP_2MUL:
- case instruction.OP_2DIV:
- case instruction.OP_MUL:
- case instruction.OP_DIV:
- case instruction.OP_MOD:
- case instruction.OP_LSHIFT:
- case instruction.OP_RSHIFT:
- return false;
-
- //
- // Push integer instructions
- //
- case instruction.OP_1NEGATE:
- case instruction.OP_1:
- case instruction.OP_2:
- case instruction.OP_3:
- case instruction.OP_4:
- case instruction.OP_5:
- case instruction.OP_6:
- case instruction.OP_7:
- case instruction.OP_8:
- case instruction.OP_9:
- case instruction.OP_10:
- case instruction.OP_11:
- case instruction.OP_12:
- case instruction.OP_13:
- case instruction.OP_14:
- case instruction.OP_15:
- case instruction.OP_16:
- {
- // ( -- value)
- BigInteger bn = DecodeOP_N(opcode, true);
- stack.Add(bn.ToByteArray());
- }
- break;
+ return false;
+ }
- //
- // Extension
- //
- case instruction.OP_NOP:
- case instruction.OP_NOP1:
- case instruction.OP_NOP2:
- case instruction.OP_NOP3:
- case instruction.OP_NOP4:
- case instruction.OP_NOP5:
- case instruction.OP_NOP6:
- case instruction.OP_NOP7:
- case instruction.OP_NOP8:
- case instruction.OP_NOP9:
- case instruction.OP_NOP10:
- {
- // Just do nothing
- }
- break;
+ if (fExec && 0 <= opcode && opcode <= instruction.OP_PUSHDATA4)
+ {
+ stack.Add(pushArg); // Push argument to stack
+ }
+ else if (fExec || (instruction.OP_IF <= opcode && opcode <= instruction.OP_ENDIF))
+ switch (opcode)
+ {
+ //
+ // Disabled opcodes
+ //
+ case instruction.OP_CAT:
+ case instruction.OP_SUBSTR:
+ case instruction.OP_LEFT:
+ case instruction.OP_RIGHT:
+ case instruction.OP_INVERT:
+ case instruction.OP_AND:
+ case instruction.OP_OR:
+ case instruction.OP_XOR:
+ case instruction.OP_2MUL:
+ case instruction.OP_2DIV:
+ case instruction.OP_MUL:
+ case instruction.OP_DIV:
+ case instruction.OP_MOD:
+ case instruction.OP_LSHIFT:
+ case instruction.OP_RSHIFT:
+ return false;
- //
- // Control
- //
- case instruction.OP_IF:
- case instruction.OP_NOTIF:
- {
- // <expression> if [statements] [else [statements]] endif
- bool fValue = false;
- if (fExec)
+ //
+ // Push integer instructions
+ //
+ case instruction.OP_1NEGATE:
+ case instruction.OP_1:
+ case instruction.OP_2:
+ case instruction.OP_3:
+ case instruction.OP_4:
+ case instruction.OP_5:
+ case instruction.OP_6:
+ case instruction.OP_7:
+ case instruction.OP_8:
+ case instruction.OP_9:
+ case instruction.OP_10:
+ case instruction.OP_11:
+ case instruction.OP_12:
+ case instruction.OP_13:
+ case instruction.OP_14:
+ case instruction.OP_15:
+ case instruction.OP_16:
{
- if (stack.Count() < 1)
- {
- return false;
- }
- IEnumerable<byte> vch = stacktop(ref stack, -1);
- fValue = CastToBool(vch);
- if (opcode == instruction.OP_NOTIF)
- {
- fValue = !fValue;
- }
- popstack(ref stack);
+ // ( -- value)
+ BigInteger bn = DecodeOP_N(opcode, true);
+ stack.Add(bn.ToByteArray());
}
- vfExec.Add(fValue);
- }
- break;
+ break;
- case instruction.OP_ELSE:
- {
- int nExecCount = vfExec.Count();
- if (nExecCount == 0)
+ //
+ // Extension
+ //
+ case instruction.OP_NOP:
+ case instruction.OP_NOP1:
+ case instruction.OP_NOP2:
+ case instruction.OP_NOP3:
+ case instruction.OP_NOP4:
+ case instruction.OP_NOP5:
+ case instruction.OP_NOP6:
+ case instruction.OP_NOP7:
+ case instruction.OP_NOP8:
+ case instruction.OP_NOP9:
+ case instruction.OP_NOP10:
{
- return false;
+ // Just do nothing
}
- vfExec[nExecCount - 1] = !vfExec[nExecCount - 1];
- }
- break;
+ break;
- case instruction.OP_ENDIF:
- {
- int nExecCount = vfExec.Count();
- if (nExecCount == 0)
+ //
+ // Control
+ //
+ case instruction.OP_IF:
+ case instruction.OP_NOTIF:
{
- return false;
+ // <expression> if [statements] [else [statements]] endif
+ bool fValue = false;
+ if (fExec)
+ {
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch = stacktop(ref stack, -1);
+ fValue = CastToBool(vch);
+ if (opcode == instruction.OP_NOTIF)
+ {
+ fValue = !fValue;
+ }
+ popstack(ref stack);
+ }
+ vfExec.Add(fValue);
}
- vfExec.RemoveAt(nExecCount - 1);
- }
- break;
+ break;
- case instruction.OP_VERIFY:
- {
- // (true -- ) or
- // (false -- false) and return
- if (stack.Count() < 1)
+ case instruction.OP_ELSE:
{
- return false;
+ int nExecCount = vfExec.Count();
+ if (nExecCount == 0)
+ {
+ return false;
+ }
+ vfExec[nExecCount - 1] = !vfExec[nExecCount - 1];
}
+ break;
- bool fValue = CastToBool(stacktop(ref stack, -1));
- if (fValue)
+ case instruction.OP_ENDIF:
{
- popstack(ref stack);
- }
- else
- {
- return false;
+ int nExecCount = vfExec.Count();
+ if (nExecCount == 0)
+ {
+ return false;
+ }
+ vfExec.RemoveAt(nExecCount - 1);
}
- }
- break;
-
- case instruction.OP_RETURN:
- {
- return false;
- }
+ break;
- //
- // Stack ops
- //
- case instruction.OP_TOALTSTACK:
- {
- if (stack.Count() < 1)
+ case instruction.OP_VERIFY:
{
- return false;
- }
- altStack.Add(stacktop(ref stack, -1));
- popstack(ref stack);
- }
- break;
+ // (true -- ) or
+ // (false -- false) and return
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
- case instruction.OP_FROMALTSTACK:
- {
- if (altStack.Count() < 1)
- {
- return false;
+ bool fValue = CastToBool(stacktop(ref stack, -1));
+ if (fValue)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
}
- stack.Add(stacktop(ref stack, -1));
- popstack(ref altStack);
- }
- break;
+ break;
- case instruction.OP_2DROP:
- {
- // (x1 x2 -- )
- if (stack.Count() < 2)
+ case instruction.OP_RETURN:
{
return false;
}
- popstack(ref stack);
- popstack(ref stack);
- }
- break;
- case instruction.OP_2DUP:
- {
- // (x1 x2 -- x1 x2 x1 x2)
- if (stack.Count() < 2)
+ //
+ // Stack ops
+ //
+ case instruction.OP_TOALTSTACK:
{
- return false;
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ altStack.Add(stacktop(ref stack, -1));
+ popstack(ref stack);
}
- IEnumerable<byte> vch1 = stacktop(ref stack, -2);
- IEnumerable<byte> vch2 = stacktop(ref stack, -1);
- stack.Add(vch1);
- stack.Add(vch2);
- }
- break;
+ break;
- case instruction.OP_3DUP:
- {
- // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
- if (stack.Count() < 3)
+ case instruction.OP_FROMALTSTACK:
{
- return false;
+ if (altStack.Count() < 1)
+ {
+ return false;
+ }
+ stack.Add(stacktop(ref stack, -1));
+ popstack(ref altStack);
}
- IEnumerable<byte> vch1 = stacktop(ref stack, -3);
- IEnumerable<byte> vch2 = stacktop(ref stack, -2);
- IEnumerable<byte> vch3 = stacktop(ref stack, -1);
- stack.Add(vch1);
- stack.Add(vch2);
- stack.Add(vch3);
- }
- break;
+ break;
- case instruction.OP_2OVER:
- {
- // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
- if (stack.Count() < 4)
+ case instruction.OP_2DROP:
{
- return false;
+ // (x1 x2 -- )
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+ popstack(ref stack);
+ popstack(ref stack);
}
- IEnumerable<byte> vch1 = stacktop(ref stack, -4);
- IEnumerable<byte> vch2 = stacktop(ref stack, -3);
- stack.Add(vch1);
- stack.Add(vch2);
- }
- break;
+ break;
- case instruction.OP_2ROT:
- {
- int nStackDepth = stack.Count();
- // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
- if (nStackDepth < 6)
+ case instruction.OP_2DUP:
{
- return false;
+ // (x1 x2 -- x1 x2 x1 x2)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -2);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -1);
+ stack.Add(vch1);
+ stack.Add(vch2);
}
- IEnumerable<byte> vch1 = stacktop(ref stack, -6);
- IEnumerable<byte> vch2 = stacktop(ref stack, -5);
- stack.RemoveRange(nStackDepth - 6, 2);
- stack.Add(vch1);
- stack.Add(vch2);
- }
- break;
+ break;
- case instruction.OP_2SWAP:
- {
- // (x1 x2 x3 x4 -- x3 x4 x1 x2)
- int nStackDepth = stack.Count();
- if (nStackDepth < 4)
+ case instruction.OP_3DUP:
{
- return false;
+ // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
+ if (stack.Count() < 3)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -3);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -2);
+ IEnumerable<byte> vch3 = stacktop(ref stack, -1);
+ stack.Add(vch1);
+ stack.Add(vch2);
+ stack.Add(vch3);
}
- stack.Swap(nStackDepth - 4, nStackDepth - 2);
- stack.Swap(nStackDepth - 3, nStackDepth - 1);
- }
- break;
+ break;
- case instruction.OP_IFDUP:
- {
- // (x - 0 | x x)
- if (stack.Count() < 1)
+ case instruction.OP_2OVER:
{
- return false;
+ // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
+ if (stack.Count() < 4)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -4);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -3);
+ stack.Add(vch1);
+ stack.Add(vch2);
}
+ break;
- IEnumerable<byte> vch = stacktop(ref stack, -1);
-
- if (CastToBool(vch))
+ case instruction.OP_2ROT:
{
- stack.Add(vch);
+ int nStackDepth = stack.Count();
+ // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
+ if (nStackDepth < 6)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -6);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -5);
+ stack.RemoveRange(nStackDepth - 6, 2);
+ stack.Add(vch1);
+ stack.Add(vch2);
}
- }
- break;
-
- case instruction.OP_DEPTH:
- {
- // -- stacksize
- BigInteger bn = new BigInteger((ushort)stack.Count());
- stack.Add(bn.ToByteArray());
- }
- break;
+ break;
- case instruction.OP_DROP:
- {
- // (x -- )
- if (stack.Count() < 1)
+ case instruction.OP_2SWAP:
{
- return false;
+ // (x1 x2 x3 x4 -- x3 x4 x1 x2)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 4)
+ {
+ return false;
+ }
+ stack.Swap(nStackDepth - 4, nStackDepth - 2);
+ stack.Swap(nStackDepth - 3, nStackDepth - 1);
}
+ break;
- popstack(ref stack);
- }
- break;
-
- case instruction.OP_DUP:
- {
- // (x -- x x)
- if (stack.Count() < 1)
+ case instruction.OP_IFDUP:
{
- return false;
- }
+ // (x - 0 | x x)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
- IEnumerable<byte> vch = stacktop(ref stack, -1);
- stack.Add(vch);
- }
- break;
+ IEnumerable<byte> vch = stacktop(ref stack, -1);
- case instruction.OP_NIP:
- {
- // (x1 x2 -- x2)
- int nStackDepth = stack.Count();
- if (nStackDepth < 2)
- {
- return false;
+ if (CastToBool(vch))
+ {
+ stack.Add(vch);
+ }
}
+ break;
- stack.RemoveAt(nStackDepth - 2);
- }
- break;
-
- case instruction.OP_OVER:
- {
- // (x1 x2 -- x1 x2 x1)
- if (stack.Count() < 2)
+ case instruction.OP_DEPTH:
{
- return false;
+ // -- stacksize
+ BigInteger bn = new BigInteger((ushort)stack.Count());
+ stack.Add(bn.ToByteArray());
}
+ break;
- IEnumerable<byte> vch = stacktop(ref stack, -2);
- stack.Add(vch);
- }
- break;
-
- case instruction.OP_PICK:
- case instruction.OP_ROLL:
- {
- // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
- // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
-
- int nStackDepth = stack.Count();
- if (nStackDepth < 2)
+ case instruction.OP_DROP:
{
- return false;
- }
-
- int n = (int)CastToBigInteger(stacktop(ref stack, -1));
- popstack(ref stack);
+ // (x -- )
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
- if (n < 0 || n >= stack.Count())
- {
- return false;
+ popstack(ref stack);
}
+ break;
- IEnumerable<byte> vch = stacktop(ref stack, -n - 1);
- if (opcode == instruction.OP_ROLL)
+ case instruction.OP_DUP:
{
- stack.RemoveAt(nStackDepth - n - 1);
- }
+ // (x -- x x)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
- stack.Add(vch);
- }
- break;
+ IEnumerable<byte> vch = stacktop(ref stack, -1);
+ stack.Add(vch);
+ }
+ break;
- case instruction.OP_ROT:
- {
- // (x1 x2 x3 -- x2 x3 x1)
- // x2 x1 x3 after first swap
- // x2 x3 x1 after second swap
- int nStackDepth = stack.Count();
- if (nStackDepth < 3)
+ case instruction.OP_NIP:
{
- return false;
- }
- stack.Swap(nStackDepth - 3, nStackDepth - 2);
- stack.Swap(nStackDepth - 2, nStackDepth - 1);
+ // (x1 x2 -- x2)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
- }
- break;
+ stack.RemoveAt(nStackDepth - 2);
+ }
+ break;
- case instruction.OP_SWAP:
- {
- // (x1 x2 -- x2 x1)
- int nStackDepth = stack.Count();
- if (nStackDepth < 2)
+ case instruction.OP_OVER:
{
- return false;
+ // (x1 x2 -- x1 x2 x1)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ IEnumerable<byte> vch = stacktop(ref stack, -2);
+ stack.Add(vch);
}
- stack.Swap(nStackDepth - 2, nStackDepth - 1);
- }
- break;
+ break;
- case instruction.OP_TUCK:
- {
- // (x1 x2 -- x2 x1 x2)
- int nStackDepth = stack.Count();
- if (nStackDepth < 2)
+ case instruction.OP_PICK:
+ case instruction.OP_ROLL:
{
- return false;
- }
- IEnumerable<byte> vch = stacktop(ref stack, -1);
- stack.Insert(nStackDepth - 2, vch);
- }
- break;
+ // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
+ // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
- case instruction.OP_SIZE:
- {
- // (in -- in size)
- if (stack.Count() < 1)
- {
- return false;
- }
+ int n = (int)CastToBigInteger(stacktop(ref stack, -1));
+ popstack(ref stack);
- BigInteger bnSize = new BigInteger((ushort)stacktop(ref stack, -1).Count());
- stack.Add(bnSize.ToByteArray());
- }
- break;
+ if (n < 0 || n >= stack.Count())
+ {
+ return false;
+ }
+ IEnumerable<byte> vch = stacktop(ref stack, -n - 1);
+ if (opcode == instruction.OP_ROLL)
+ {
+ stack.RemoveAt(nStackDepth - n - 1);
+ }
- //
- // Bitwise logic
- //
- case instruction.OP_EQUAL:
- case instruction.OP_EQUALVERIFY:
- //case instruction.OP_NOTEQUAL: // use OP_NUMNOTEQUAL
- {
- // (x1 x2 - bool)
- if (stack.Count() < 2)
- {
- return false;
+ stack.Add(vch);
}
+ break;
- IEnumerable<byte> vch1 = stacktop(ref stack, -2);
- IEnumerable<byte> vch2 = stacktop(ref stack, -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 == instruction.OP_NOTEQUAL)
- // fEqual = !fEqual;
- popstack(ref stack);
- popstack(ref stack);
- stack.Add(fEqual ? trueBytes : falseBytes);
-
- if (opcode == instruction.OP_EQUALVERIFY)
+ case instruction.OP_ROT:
{
- if (fEqual)
- {
- popstack(ref stack);
- }
- else
+ // (x1 x2 x3 -- x2 x3 x1)
+ // x2 x1 x3 after first swap
+ // x2 x3 x1 after second swap
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 3)
{
return false;
}
- }
- }
- break;
+ stack.Swap(nStackDepth - 3, nStackDepth - 2);
+ stack.Swap(nStackDepth - 2, nStackDepth - 1);
-
- //
- // Numeric
- //
- case instruction.OP_1ADD:
- case instruction.OP_1SUB:
- case instruction.OP_NEGATE:
- case instruction.OP_ABS:
- case instruction.OP_NOT:
- case instruction.OP_0NOTEQUAL:
- {
- // (in -- out)
- if (stack.Count() < 1)
- {
- return false;
}
+ break;
- BigInteger bn = CastToBigInteger(stacktop(ref stack, -1));
- switch (opcode)
+ case instruction.OP_SWAP:
{
- case instruction.OP_1ADD:
- bn = bn + 1;
- break;
- case instruction.OP_1SUB:
- bn = bn - 1;
- break;
- case instruction.OP_NEGATE:
- bn = -bn;
- break;
- case instruction.OP_ABS:
- bn = BigInteger.Abs(bn);
- break;
- case instruction.OP_NOT:
- bn = bn == 0 ? 1 : 0;
- break;
- case instruction.OP_0NOTEQUAL:
- bn = bn != 0 ? 1 : 0;
- break;
+ // (x1 x2 -- x2 x1)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+ stack.Swap(nStackDepth - 2, nStackDepth - 1);
}
+ break;
- popstack(ref stack);
- stack.Add(bn.ToByteArray());
- }
- break;
-
- case instruction.OP_ADD:
- case instruction.OP_SUB:
- case instruction.OP_BOOLAND:
- case instruction.OP_BOOLOR:
- case instruction.OP_NUMEQUAL:
- case instruction.OP_NUMEQUALVERIFY:
- case instruction.OP_NUMNOTEQUAL:
- case instruction.OP_LESSTHAN:
- case instruction.OP_GREATERTHAN:
- case instruction.OP_LESSTHANOREQUAL:
- case instruction.OP_GREATERTHANOREQUAL:
- case instruction.OP_MIN:
- case instruction.OP_MAX:
- {
- // (x1 x2 -- out)
- if (stack.Count() < 2)
+ case instruction.OP_TUCK:
{
- return false;
+ // (x1 x2 -- x2 x1 x2)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+ IEnumerable<byte> vch = stacktop(ref stack, -1);
+ stack.Insert(nStackDepth - 2, vch);
}
+ break;
- BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -2));
- BigInteger bn2 = CastToBigInteger(stacktop(ref stack, -1));
- BigInteger bn = 0;
- switch (opcode)
+ case instruction.OP_SIZE:
{
- case instruction.OP_ADD:
- bn = bn1 + bn2;
- break;
- case instruction.OP_SUB:
- bn = bn1 - bn2;
- break;
- case instruction.OP_BOOLAND:
- bn = (bn1 != 0 && bn2 != 0) ? 1 : 0;
- break;
- case instruction.OP_BOOLOR:
- bn = (bn1 != 0 || bn2 != 0) ? 1 : 0;
- break;
- case instruction.OP_NUMEQUAL:
- bn = (bn1 == bn2) ? 1 : 0;
- break;
- case instruction.OP_NUMEQUALVERIFY:
- bn = (bn1 == bn2) ? 1 : 0;
- break;
- case instruction.OP_NUMNOTEQUAL:
- bn = (bn1 != bn2) ? 1 : 0;
- break;
- case instruction.OP_LESSTHAN:
- bn = (bn1 < bn2) ? 1 : 0;
- break;
- case instruction.OP_GREATERTHAN:
- bn = (bn1 > bn2) ? 1 : 0;
- break;
- case instruction.OP_LESSTHANOREQUAL:
- bn = (bn1 <= bn2) ? 1 : 0;
- break;
- case instruction.OP_GREATERTHANOREQUAL:
- bn = (bn1 >= bn2) ? 1 : 0;
- break;
- case instruction.OP_MIN:
- bn = (bn1 < bn2 ? bn1 : bn2);
- break;
- case instruction.OP_MAX:
- bn = (bn1 > bn2 ? bn1 : bn2);
- break;
+ // (in -- in size)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ BigInteger bnSize = new BigInteger((ushort)stacktop(ref stack, -1).Count());
+ stack.Add(bnSize.ToByteArray());
}
+ break;
- popstack(ref stack);
- popstack(ref stack);
- stack.Add(bn.ToByteArray());
- if (opcode == instruction.OP_NUMEQUALVERIFY)
+ //
+ // Bitwise logic
+ //
+ case instruction.OP_EQUAL:
+ case instruction.OP_EQUALVERIFY:
+ //case instruction.OP_NOTEQUAL: // use OP_NUMNOTEQUAL
{
- if (CastToBool(stacktop(ref stack, -1)))
- {
- popstack(ref stack);
- }
- else
+ // (x1 x2 - bool)
+ if (stack.Count() < 2)
{
return false;
}
- }
- }
- break;
- case instruction.OP_WITHIN:
- {
- // (x min max -- out)
- if (stack.Count() < 3)
- return false;
- BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -3));
- BigInteger bn2 = CastToBigInteger(stacktop(ref stack, -2));
- BigInteger bn3 = CastToBigInteger(stacktop(ref stack, -1));
- bool fValue = (bn2 <= bn1 && bn1 < bn3);
- popstack(ref stack);
- popstack(ref stack);
- popstack(ref stack);
- stack.Add(fValue ? trueBytes : falseBytes);
- }
- break;
+ IEnumerable<byte> vch1 = stacktop(ref stack, -2);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -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 == instruction.OP_NOTEQUAL)
+ // fEqual = !fEqual;
+ popstack(ref stack);
+ popstack(ref stack);
+ stack.Add(fEqual ? trueBytes : falseBytes);
- //
- // Crypto
- //
- case instruction.OP_RIPEMD160:
- case instruction.OP_SHA1:
- case instruction.OP_SHA256:
- case instruction.OP_HASH160:
- case instruction.OP_HASH256:
- {
- // (in -- hash)
- if (stack.Count() < 1)
- {
- return false;
+ if (opcode == instruction.OP_EQUALVERIFY)
+ {
+ if (fEqual)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
}
- Hash hash = null;
- IEnumerable<byte> data = stacktop(ref stack, -1);
+ break;
+
- switch (opcode)
+ //
+ // Numeric
+ //
+ case instruction.OP_1ADD:
+ case instruction.OP_1SUB:
+ case instruction.OP_NEGATE:
+ case instruction.OP_ABS:
+ case instruction.OP_NOT:
+ case instruction.OP_0NOTEQUAL:
{
- case instruction.OP_HASH160:
- hash = Hash160.Compute160(data);
- break;
- case instruction.OP_HASH256:
- hash = Hash256.Compute256(data);
- break;
- case instruction.OP_SHA1:
- hash = SHA1.Compute1(data);
- break;
- case instruction.OP_SHA256:
- hash = SHA256.Compute256(data);
- break;
- case instruction.OP_RIPEMD160:
- hash = RIPEMD160.Compute160(data);
- break;
- }
- popstack(ref stack);
- stack.Add(hash.hashBytes);
- }
- break;
+ // (in -- out)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
- case instruction.OP_CODESEPARATOR:
- {
- // Hash starts after the code separator
- nCodeHashBegin = CodeQueue.CurrentIndex;
- }
- break;
+ BigInteger bn = CastToBigInteger(stacktop(ref stack, -1));
+ switch (opcode)
+ {
+ case instruction.OP_1ADD:
+ bn = bn + 1;
+ break;
+ case instruction.OP_1SUB:
+ bn = bn - 1;
+ break;
+ case instruction.OP_NEGATE:
+ bn = -bn;
+ break;
+ case instruction.OP_ABS:
+ bn = BigInteger.Abs(bn);
+ break;
+ case instruction.OP_NOT:
+ bn = bn == 0 ? 1 : 0;
+ break;
+ case instruction.OP_0NOTEQUAL:
+ bn = bn != 0 ? 1 : 0;
+ break;
+ }
- case instruction.OP_CHECKSIG:
- case instruction.OP_CHECKSIGVERIFY:
- {
- // (sig pubkey -- bool)
- if (stack.Count() < 2)
- {
- return false;
+ popstack(ref stack);
+ stack.Add(bn.ToByteArray());
}
+ break;
- IList<byte> sigBytes = stacktop(ref stack, -2).ToList();
- IList<byte> pubkeyBytes = stacktop(ref stack, -1).ToList();
+ case instruction.OP_ADD:
+ case instruction.OP_SUB:
+ case instruction.OP_BOOLAND:
+ case instruction.OP_BOOLOR:
+ case instruction.OP_NUMEQUAL:
+ case instruction.OP_NUMEQUALVERIFY:
+ case instruction.OP_NUMNOTEQUAL:
+ case instruction.OP_LESSTHAN:
+ case instruction.OP_GREATERTHAN:
+ case instruction.OP_LESSTHANOREQUAL:
+ case instruction.OP_GREATERTHANOREQUAL:
+ case instruction.OP_MIN:
+ case instruction.OP_MAX:
+ {
+ // (x1 x2 -- out)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
- // Subset of script starting at the most recent codeseparator
- CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+ BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -2));
+ BigInteger bn2 = CastToBigInteger(stacktop(ref stack, -1));
+ BigInteger bn = 0;
- // There's no way for a signature to sign itself
- scriptCode.RemovePattern(sigBytes);
+ switch (opcode)
+ {
+ case instruction.OP_ADD:
+ bn = bn1 + bn2;
+ break;
+ case instruction.OP_SUB:
+ bn = bn1 - bn2;
+ break;
+ case instruction.OP_BOOLAND:
+ bn = (bn1 != 0 && bn2 != 0) ? 1 : 0;
+ break;
+ case instruction.OP_BOOLOR:
+ bn = (bn1 != 0 || bn2 != 0) ? 1 : 0;
+ break;
+ case instruction.OP_NUMEQUAL:
+ bn = (bn1 == bn2) ? 1 : 0;
+ break;
+ case instruction.OP_NUMEQUALVERIFY:
+ bn = (bn1 == bn2) ? 1 : 0;
+ break;
+ case instruction.OP_NUMNOTEQUAL:
+ bn = (bn1 != bn2) ? 1 : 0;
+ break;
+ case instruction.OP_LESSTHAN:
+ bn = (bn1 < bn2) ? 1 : 0;
+ break;
+ case instruction.OP_GREATERTHAN:
+ bn = (bn1 > bn2) ? 1 : 0;
+ break;
+ case instruction.OP_LESSTHANOREQUAL:
+ bn = (bn1 <= bn2) ? 1 : 0;
+ break;
+ case instruction.OP_GREATERTHANOREQUAL:
+ bn = (bn1 >= bn2) ? 1 : 0;
+ break;
+ case instruction.OP_MIN:
+ bn = (bn1 < bn2 ? bn1 : bn2);
+ break;
+ case instruction.OP_MAX:
+ bn = (bn1 > bn2 ? bn1 : bn2);
+ break;
+ }
- bool fSuccess = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubkeyBytes.ToList(), flags) && CheckSig(sigBytes, pubkeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+ popstack(ref stack);
+ popstack(ref stack);
+ stack.Add(bn.ToByteArray());
- popstack(ref stack);
- popstack(ref stack);
- stack.Add(fSuccess ? trueBytes : falseBytes);
- if (opcode == instruction.OP_CHECKSIGVERIFY)
- {
- if (fSuccess)
+ if (opcode == instruction.OP_NUMEQUALVERIFY)
{
- popstack(ref stack);
+ if (CastToBool(stacktop(ref stack, -1)))
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
}
- else
+ }
+ break;
+
+ case instruction.OP_WITHIN:
+ {
+ // (x min max -- out)
+ if (stack.Count() < 3)
{
return false;
}
- }
- }
- break;
- case instruction.OP_CHECKMULTISIG:
- case instruction.OP_CHECKMULTISIGVERIFY:
- {
- // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
+ BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -3));
+ BigInteger bn2 = CastToBigInteger(stacktop(ref stack, -2));
+ BigInteger bn3 = CastToBigInteger(stacktop(ref stack, -1));
- int i = 1;
- if (stack.Count() < i)
- {
- return false;
- }
+ bool fValue = (bn2 <= bn1 && bn1 < bn3);
- int nKeysCount = (int)CastToBigInteger(stacktop(ref stack, -i));
- if (nKeysCount < 0 || nKeysCount > 20)
- {
- return false;
- }
- nOpCount += nKeysCount;
- if (nOpCount > 201)
- {
- return false;
+ popstack(ref stack);
+ popstack(ref stack);
+ popstack(ref stack);
+
+ stack.Add(fValue ? trueBytes : falseBytes);
}
- int ikey = ++i;
- i += nKeysCount;
- if (stack.Count() < i)
+ break;
+
+ //
+ // Crypto
+ //
+ case instruction.OP_RIPEMD160:
+ case instruction.OP_SHA1:
+ case instruction.OP_SHA256:
+ case instruction.OP_HASH160:
+ case instruction.OP_HASH256:
{
- return false;
+ // (in -- hash)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ Hash hash = null;
+ IEnumerable<byte> data = stacktop(ref stack, -1);
+
+ switch (opcode)
+ {
+ case instruction.OP_HASH160:
+ hash = Hash160.Compute160(data);
+ break;
+ case instruction.OP_HASH256:
+ hash = Hash256.Compute256(data);
+ break;
+ case instruction.OP_SHA1:
+ hash = SHA1.Compute1(data);
+ break;
+ case instruction.OP_SHA256:
+ hash = SHA256.Compute256(data);
+ break;
+ case instruction.OP_RIPEMD160:
+ hash = RIPEMD160.Compute160(data);
+ break;
+ }
+ popstack(ref stack);
+ stack.Add(hash.hashBytes);
}
+ break;
- int nSigsCount = (int)CastToBigInteger(stacktop(ref stack, -i));
- if (nSigsCount < 0 || nSigsCount > nKeysCount)
+ case instruction.OP_CODESEPARATOR:
{
- return false;
+ // Hash starts after the code separator
+ nCodeHashBegin = CodeQueue.CurrentIndex;
}
- int isig = ++i;
- i += nSigsCount;
- if (stack.Count() < i)
+ break;
+
+ case instruction.OP_CHECKSIG:
+ case instruction.OP_CHECKSIGVERIFY:
{
- return false;
- }
+ // (sig pubkey -- bool)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
- // Subset of script starting at the most recent codeseparator
- CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+ IList<byte> sigBytes = stacktop(ref stack, -2).ToList();
+ IList<byte> pubkeyBytes = stacktop(ref stack, -1).ToList();
- // There is no way for a signature to sign itself, so we need to drop the signatures
- for (int k = 0; k < nSigsCount; k++)
- {
- IEnumerable<byte> vchSig = stacktop(ref stack, -isig - k);
- scriptCode.RemovePattern(vchSig.ToList());
+ // Subset of script starting at the most recent codeseparator
+ CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+
+ // There's no way for a signature to sign itself
+ scriptCode.RemovePattern(sigBytes);
+
+ bool fSuccess = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubkeyBytes.ToList(), flags) && CheckSig(sigBytes, pubkeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+
+ popstack(ref stack);
+ popstack(ref stack);
+
+ stack.Add(fSuccess ? trueBytes : falseBytes);
+
+ if (opcode == instruction.OP_CHECKSIGVERIFY)
+ {
+ if (fSuccess)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
}
+ break;
- bool fSuccess = true;
- while (fSuccess && nSigsCount > 0)
+ case instruction.OP_CHECKMULTISIG:
+ case instruction.OP_CHECKMULTISIGVERIFY:
{
- IList<byte> sigBytes = stacktop(ref stack, -isig).ToList();
- IList<byte> pubKeyBytes = stacktop(ref stack, -ikey).ToList();
+ // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
- // Check signature
- bool fOk = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubKeyBytes.ToList(), flags) && CheckSig(sigBytes, pubKeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+ int i = 1;
+ if (stack.Count() < i)
+ {
+ return false;
+ }
- if (fOk)
+ int nKeysCount = (int)CastToBigInteger(stacktop(ref stack, -i));
+ if (nKeysCount < 0 || nKeysCount > 20)
{
- isig++;
- nSigsCount--;
+ return false;
+ }
+ nOpCount += nKeysCount;
+ if (nOpCount > 201)
+ {
+ return false;
+ }
+ int ikey = ++i;
+ i += nKeysCount;
+ if (stack.Count() < i)
+ {
+ return false;
}
- ikey++;
- nKeysCount--;
- // If there are more signatures left than keys left,
- // then too many signatures have failed
- if (nSigsCount > nKeysCount)
+ int nSigsCount = (int)CastToBigInteger(stacktop(ref stack, -i));
+ if (nSigsCount < 0 || nSigsCount > nKeysCount)
{
- fSuccess = false;
+ return false;
+ }
+ int isig = ++i;
+ i += nSigsCount;
+ if (stack.Count() < i)
+ {
+ return false;
}
- }
- while (i-- > 1)
- {
- popstack(ref stack);
- }
+ // Subset of script starting at the most recent codeseparator
+ CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
- // A bug causes CHECKMULTISIG to consume one extra argument
- // whose contents were not checked in any way.
- //
- // Unfortunately this is a potential source of mutability,
- // so optionally verify it is exactly equal to zero prior
- // to removing it from the stack.
- if (stack.Count() < 1)
- {
- return false;
- }
- if ((flags & (int)scriptflag.SCRIPT_VERIFY_NULLDUMMY) != 0 && stacktop(ref stack, -1).Count() != 0)
- {
- return false; // CHECKMULTISIG dummy argument not null
- }
- popstack(ref stack);
+ // There is no way for a signature to sign itself, so we need to drop the signatures
+ for (int k = 0; k < nSigsCount; k++)
+ {
+ IEnumerable<byte> vchSig = stacktop(ref stack, -isig - k);
+ scriptCode.RemovePattern(vchSig.ToList());
+ }
- stack.Add(fSuccess ? trueBytes : falseBytes);
+ bool fSuccess = true;
+ while (fSuccess && nSigsCount > 0)
+ {
+ IList<byte> sigBytes = stacktop(ref stack, -isig).ToList();
+ IList<byte> pubKeyBytes = stacktop(ref stack, -ikey).ToList();
+
+ // Check signature
+ bool fOk = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubKeyBytes.ToList(), flags) && CheckSig(sigBytes, pubKeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+
+ if (fOk)
+ {
+ isig++;
+ nSigsCount--;
+ }
+ ikey++;
+ nKeysCount--;
+
+ // If there are more signatures left than keys left,
+ // then too many signatures have failed
+ if (nSigsCount > nKeysCount)
+ {
+ fSuccess = false;
+ }
+ }
- if (opcode == instruction.OP_CHECKMULTISIGVERIFY)
- {
- if (fSuccess)
+ while (i-- > 1)
{
popstack(ref stack);
}
- else
+
+ // A bug causes CHECKMULTISIG to consume one extra argument
+ // whose contents were not checked in any way.
+ //
+ // Unfortunately this is a potential source of mutability,
+ // so optionally verify it is exactly equal to zero prior
+ // to removing it from the stack.
+ if (stack.Count() < 1)
{
return false;
}
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_NULLDUMMY) != 0 && stacktop(ref stack, -1).Count() != 0)
+ {
+ return false; // CHECKMULTISIG dummy argument not null
+ }
+ popstack(ref stack);
+
+ stack.Add(fSuccess ? trueBytes : falseBytes);
+
+ if (opcode == instruction.OP_CHECKMULTISIGVERIFY)
+ {
+ if (fSuccess)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
}
- }
- break;
+ break;
- default:
- return false;
- }
+ default:
+ return false;
+ }
- // Size limits
- if (stack.Count() + altStack.Count() > 1000)
- {
- return false;
+ // Size limits
+ if (stack.Count() + altStack.Count() > 1000)
+ {
+ return false;
+ }
}
}
+ catch (Exception)
+ {
+ // If there are any exceptions then just return false.
+ return false;
+ }
-
- if (vfExec.Count() == 0)
+ if (vfExec.Count() != 0)
{
+ // Something went wrong with conditional instructions.
return false;
}
}
- static bool IsCanonicalPubKey(IList<byte> pubKeyBytes, int flags)
+ public static bool IsCanonicalPubKey(IList<byte> pubKeyBytes, int flags)
{
if ((flags & (int)scriptflag.SCRIPT_VERIFY_STRICTENC) == 0)
return true;
return true;
}
- static bool IsCanonicalSignature(IList<byte> sigBytes, int flags)
+ public static bool IsCanonicalSignature(IList<byte> sigBytes, int flags)
{
// STUB
/// <param name="nHashType">Hashing type flag</param>
/// <param name="flags">Signature checking flags</param>
/// <returns></returns>
- static bool CheckSig(IList<byte> sigBytes, IList<byte> pubkeyBytes, CScript script, CTransaction txTo, int nIn, int nHashType, int flags)
+ public static bool CheckSig(IList<byte> sigBytes, IList<byte> pubkeyBytes, CScript script, CTransaction txTo, int nIn, int nHashType, int flags)
{
CPubKey pubkey;
git://git.novaco.in / NovacoinLibrary.git / commitdiff