private void ExecuteOp(OpCode opcode, ExecutionContext context)
{
LastOpCode = opcode;
if (opcode > OpCode.PUSH16 && opcode != OpCode.RET && context.PushOnly)
{
State |= VMState.FAULT;
return;
}
if (opcode >= OpCode.PUSHBYTES1 && opcode <= OpCode.PUSHBYTES75)
{
EvaluationStack.Push(context.OpReader.ReadBytes((byte)opcode));
}
else
{
switch (opcode)
{
// Push value
case OpCode.PUSH0:
EvaluationStack.Push(new byte[0]);
break;
case OpCode.PUSHDATA1:
EvaluationStack.Push(context.OpReader.ReadBytes(context.OpReader.ReadByte()));
break;
case OpCode.PUSHDATA2:
EvaluationStack.Push(context.OpReader.ReadBytes(context.OpReader.ReadUInt16()));
break;
case OpCode.PUSHDATA4:
EvaluationStack.Push(context.OpReader.ReadBytes(context.OpReader.ReadInt32()));
break;
case OpCode.PUSHM1:
case OpCode.PUSH1:
case OpCode.PUSH2:
case OpCode.PUSH3:
case OpCode.PUSH4:
case OpCode.PUSH5:
case OpCode.PUSH6:
case OpCode.PUSH7:
case OpCode.PUSH8:
case OpCode.PUSH9:
case OpCode.PUSH10:
case OpCode.PUSH11:
case OpCode.PUSH12:
case OpCode.PUSH13:
case OpCode.PUSH14:
case OpCode.PUSH15:
case OpCode.PUSH16:
EvaluationStack.Push((int)opcode - (int)OpCode.PUSH1 + 1);
break;
// Control
case OpCode.NOP:
break;
case OpCode.JMP:
case OpCode.JMPIF:
case OpCode.JMPIFNOT:
{
int offset = context.OpReader.ReadInt16();
offset = context.InstructionPointer + offset - 3;
if (offset < 0 || offset > context.Script.Length)
{
State |= VMState.FAULT;
return;
}
bool fValue = true;
if (opcode > OpCode.JMP)
{
fValue = EvaluationStack.Pop().GetBoolean();
if (opcode == OpCode.JMPIFNOT)
{
fValue = !fValue;
}
}
if (fValue)
{
context.InstructionPointer = offset;
}
}
break;
case OpCode.CALL:
InvocationStack.Push(context.Clone());
context.InstructionPointer += 2;
ExecuteOp(OpCode.JMP, CurrentContext);
break;
case OpCode.RET:
InvocationStack.Pop().Dispose();
if (InvocationStack.Count == 0)
{
State |= VMState.HALT;
}
break;
case OpCode.APPCALL:
case OpCode.TAILCALL:
{
if (table == null)
{
State |= VMState.FAULT;
return;
}
byte[] script_hash = context.OpReader.ReadBytes(20);
byte[] script = table.GetScript(script_hash);
if (script == null)
{
State |= VMState.FAULT;
return;
}
if (opcode == OpCode.TAILCALL)
{
InvocationStack.Pop().Dispose();
}
LoadScript(script);
}
break;
case OpCode.SYSCALL:
if (!service.Invoke(Encoding.ASCII.GetString(context.OpReader.ReadVarBytes(252)), this))
{
State |= VMState.FAULT;
}
break;
// Stack ops
case OpCode.DUPFROMALTSTACK:
EvaluationStack.Push(AltStack.Peek());
break;
case OpCode.TOALTSTACK:
AltStack.Push(EvaluationStack.Pop());
break;
case OpCode.FROMALTSTACK:
EvaluationStack.Push(AltStack.Pop());
break;
case OpCode.XDROP:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
if (n < 0)
{
State |= VMState.FAULT;
return;
}
EvaluationStack.Remove(n);
}
break;
case OpCode.XSWAP:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
if (n < 0)
{
State |= VMState.FAULT;
return;
}
if (n == 0)
{
break;
}
StackItem xn = EvaluationStack.Peek(n);
EvaluationStack.Set(n, EvaluationStack.Peek());
EvaluationStack.Set(0, xn);
}
break;
case OpCode.XTUCK:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
if (n <= 0)
{
State |= VMState.FAULT;
return;
}
EvaluationStack.Insert(n, EvaluationStack.Peek());
}
break;
case OpCode.DEPTH:
EvaluationStack.Push(EvaluationStack.Count);
break;
case OpCode.DROP:
EvaluationStack.Pop();
break;
case OpCode.DUP:
EvaluationStack.Push(EvaluationStack.Peek());
break;
case OpCode.NIP:
{
StackItem x2 = EvaluationStack.Pop();
EvaluationStack.Pop();
EvaluationStack.Push(x2);
}
break;
case OpCode.OVER:
{
StackItem x2 = EvaluationStack.Pop();
StackItem x1 = EvaluationStack.Peek();
EvaluationStack.Push(x2);
EvaluationStack.Push(x1);
}
break;
case OpCode.PICK:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
if (n < 0)
{
State |= VMState.FAULT;
return;
}
EvaluationStack.Push(EvaluationStack.Peek(n));
}
break;
case OpCode.ROLL:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
if (n < 0)
{
State |= VMState.FAULT;
return;
}
if (n == 0)
{
break;
}
EvaluationStack.Push(EvaluationStack.Remove(n));
}
break;
case OpCode.ROT:
{
StackItem x3 = EvaluationStack.Pop();
StackItem x2 = EvaluationStack.Pop();
StackItem x1 = EvaluationStack.Pop();
EvaluationStack.Push(x2);
EvaluationStack.Push(x3);
EvaluationStack.Push(x1);
}
break;
case OpCode.SWAP:
{
StackItem x2 = EvaluationStack.Pop();
StackItem x1 = EvaluationStack.Pop();
EvaluationStack.Push(x2);
EvaluationStack.Push(x1);
}
break;
case OpCode.TUCK:
{
StackItem x2 = EvaluationStack.Pop();
StackItem x1 = EvaluationStack.Pop();
EvaluationStack.Push(x2);
EvaluationStack.Push(x1);
EvaluationStack.Push(x2);
}
break;
case OpCode.CAT:
{
byte[] x2 = EvaluationStack.Pop().GetByteArray();
byte[] x1 = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(x1.Concat(x2).ToArray());
}
break;
case OpCode.SUBSTR:
{
int count = (int)EvaluationStack.Pop().GetBigInteger();
if (count < 0)
{
State |= VMState.FAULT;
return;
}
int index = (int)EvaluationStack.Pop().GetBigInteger();
if (index < 0)
{
State |= VMState.FAULT;
return;
}
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(x.Skip(index).Take(count).ToArray());
}
break;
case OpCode.LEFT:
{
int count = (int)EvaluationStack.Pop().GetBigInteger();
if (count < 0)
{
State |= VMState.FAULT;
return;
}
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(x.Take(count).ToArray());
}
break;
case OpCode.RIGHT:
{
int count = (int)EvaluationStack.Pop().GetBigInteger();
if (count < 0)
{
State |= VMState.FAULT;
return;
}
byte[] x = EvaluationStack.Pop().GetByteArray();
if (x.Length < count)
{
State |= VMState.FAULT;
return;
}
EvaluationStack.Push(x.Skip(x.Length - count).ToArray());
}
break;
case OpCode.SIZE:
{
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(x.Length);
}
break;
// Bitwise logic
case OpCode.INVERT:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(~x);
}
break;
case OpCode.AND:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 & x2);
}
break;
case OpCode.OR:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 | x2);
}
break;
case OpCode.XOR:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 ^ x2);
}
break;
case OpCode.EQUAL:
{
StackItem x2 = EvaluationStack.Pop();
StackItem x1 = EvaluationStack.Pop();
EvaluationStack.Push(x1.Equals(x2));
}
break;
// Numeric
case OpCode.INC:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x + 1);
}
break;
case OpCode.DEC:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x - 1);
}
break;
case OpCode.SIGN:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x.Sign);
}
break;
case OpCode.NEGATE:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(-x);
}
break;
case OpCode.ABS:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(BigInteger.Abs(x));
}
break;
case OpCode.NOT:
{
bool x = EvaluationStack.Pop().GetBoolean();
EvaluationStack.Push(!x);
}
break;
case OpCode.NZ:
{
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x != BigInteger.Zero);
}
break;
case OpCode.ADD:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 + x2);
}
break;
case OpCode.SUB:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 - x2);
}
break;
case OpCode.MUL:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 * x2);
}
break;
case OpCode.DIV:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 / x2);
}
break;
case OpCode.MOD:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 % x2);
}
break;
case OpCode.SHL:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x << n);
}
break;
case OpCode.SHR:
{
int n = (int)EvaluationStack.Pop().GetBigInteger();
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x >> n);
}
break;
case OpCode.BOOLAND:
{
bool x2 = EvaluationStack.Pop().GetBoolean();
bool x1 = EvaluationStack.Pop().GetBoolean();
EvaluationStack.Push(x1 && x2);
}
break;
case OpCode.BOOLOR:
{
bool x2 = EvaluationStack.Pop().GetBoolean();
bool x1 = EvaluationStack.Pop().GetBoolean();
EvaluationStack.Push(x1 || x2);
}
break;
case OpCode.NUMEQUAL:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 == x2);
}
break;
case OpCode.NUMNOTEQUAL:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 != x2);
}
break;
case OpCode.LT:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 < x2);
}
break;
case OpCode.GT:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 > x2);
}
break;
case OpCode.LTE:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 <= x2);
}
break;
case OpCode.GTE:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(x1 >= x2);
}
break;
case OpCode.MIN:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(BigInteger.Min(x1, x2));
}
break;
case OpCode.MAX:
{
BigInteger x2 = EvaluationStack.Pop().GetBigInteger();
BigInteger x1 = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(BigInteger.Max(x1, x2));
}
break;
case OpCode.WITHIN:
{
BigInteger b = EvaluationStack.Pop().GetBigInteger();
BigInteger a = EvaluationStack.Pop().GetBigInteger();
BigInteger x = EvaluationStack.Pop().GetBigInteger();
EvaluationStack.Push(a <= x && x < b);
}
break;
// Crypto
case OpCode.SHA1:
using (SHA1 sha = SHA1.Create())
{
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(sha.ComputeHash(x));
}
break;
case OpCode.SHA256:
using (SHA256 sha = SHA256.Create())
{
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(sha.ComputeHash(x));
}
break;
case OpCode.HASH160:
{
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(Crypto.Hash160(x));
}
break;
case OpCode.HASH256:
{
byte[] x = EvaluationStack.Pop().GetByteArray();
EvaluationStack.Push(Crypto.Hash256(x));
}
break;
case OpCode.CHECKSIG:
{
byte[] pubkey = EvaluationStack.Pop().GetByteArray();
byte[] signature = EvaluationStack.Pop().GetByteArray();
try
{
EvaluationStack.Push(Crypto.VerifySignature(ScriptContainer.GetMessage(), signature, pubkey));
}
catch (ArgumentException)
{
EvaluationStack.Push(false);
}
}
break;
case OpCode.CHECKMULTISIG:
{
int n;
byte[][] pubkeys;
StackItem item = EvaluationStack.Pop();
if (item.IsArray)
{
pubkeys = item.GetArray().Select(p => p.GetByteArray()).ToArray();
n = pubkeys.Length;
if (n == 0)
{
State |= VMState.FAULT;
return;
}
}
else
{
n = (int)item.GetBigInteger();
if (n < 1)
{
State |= VMState.FAULT;
return;
}
pubkeys = new byte[n][];
for (int i = 0; i < n; i++)
{
pubkeys[i] = EvaluationStack.Pop().GetByteArray();
}
}
int m;
byte[][] signatures;
item = EvaluationStack.Pop();
if (item.IsArray)
{
signatures = item.GetArray().Select(p => p.GetByteArray()).ToArray();
m = signatures.Length;
if (m == 0 || m > n)
{
State |= VMState.FAULT;
return;
}
}
else
{
m = (int)item.GetBigInteger();
if (m < 1 || m > n)
{
State |= VMState.FAULT;
return;
}
signatures = new byte[m][];
for (int i = 0; i < m; i++)
{
signatures[i] = EvaluationStack.Pop().GetByteArray();
}
}
byte[] message = ScriptContainer.GetMessage();
bool fSuccess = true;
try
{
for (int i = 0, j = 0; fSuccess && i < m && j < n;)
{
if (Crypto.VerifySignature(message, signatures[i], pubkeys[j]))
{
i++;
}
j++;
if (m - i > n - j)
{
fSuccess = false;
}
}
}
catch (ArgumentException)
{
fSuccess = false;
}
EvaluationStack.Push(fSuccess);
}
break;
// Array
case OpCode.ARRAYSIZE:
{
StackItem item = EvaluationStack.Pop();
if (!item.IsArray)
{
EvaluationStack.Push(item.GetByteArray().Length);
}
else
{
EvaluationStack.Push(item.GetArray().Length);
}
}
break;
case OpCode.PACK:
{
int size = (int)EvaluationStack.Pop().GetBigInteger();
if (size < 0 || size > EvaluationStack.Count)
{
State |= VMState.FAULT;
return;
}
StackItem[] items = new StackItem[size];
for (int i = 0; i < size; i++)
{
items[i] = EvaluationStack.Pop();
}
EvaluationStack.Push(items);
}
break;
case OpCode.UNPACK:
{
StackItem item = EvaluationStack.Pop();
if (!item.IsArray)
{
State |= VMState.FAULT;
return;
}
StackItem[] items = item.GetArray();
for (int i = items.Length - 1; i >= 0; i--)
{
EvaluationStack.Push(items[i]);
}
EvaluationStack.Push(items.Length);
}
break;
case OpCode.PICKITEM:
{
int index = (int)EvaluationStack.Pop().GetBigInteger();
if (index < 0)
{
State |= VMState.FAULT;
return;
}
StackItem item = EvaluationStack.Pop();
if (!item.IsArray)
{
State |= VMState.FAULT;
return;
}
StackItem[] items = item.GetArray();
if (index >= items.Length)
{
State |= VMState.FAULT;
return;
}
EvaluationStack.Push(items[index]);
}
break;
case OpCode.SETITEM:
{
StackItem newItem = EvaluationStack.Pop();
if (newItem.IsStruct)
{
newItem = (newItem as Types.Struct).Clone();
}
int index = (int)EvaluationStack.Pop().GetBigInteger();
StackItem arrItem = EvaluationStack.Pop();
if (!arrItem.IsArray)
{
State |= VMState.FAULT;
return;
}
StackItem[] items = arrItem.GetArray();
if (index < 0 || index >= items.Length)
{
State |= VMState.FAULT;
return;
}
items[index] = newItem;
}
break;
case OpCode.NEWARRAY:
{
int count = (int)EvaluationStack.Pop().GetBigInteger();
StackItem[] items = new StackItem[count];
for (var i = 0; i < count; i++)
{
items[i] = false;
}
EvaluationStack.Push(new Types.Array(items));
}
break;
case OpCode.NEWSTRUCT:
{
int count = (int)EvaluationStack.Pop().GetBigInteger();
StackItem[] items = new StackItem[count];
for (var i = 0; i < count; i++)
{
items[i] = false;
}
EvaluationStack.Push(new VM.Types.Struct(items));
}
break;
// Exceptions
case OpCode.THROW:
State |= VMState.FAULT;
return;
case OpCode.THROWIFNOT:
if (!EvaluationStack.Pop().GetBoolean())
{
State |= VMState.FAULT;
return;
}
break;
default:
State |= VMState.FAULT;
LastException = new Exception("Not a valid OpCode");
return;
}
}
if (!State.HasFlag(VMState.FAULT) && InvocationStack.Count > 0)
{
if (CurrentContext.BreakPoints.Contains((uint)CurrentContext.InstructionPointer))
{
State |= VMState.BREAK;
}
}
}