IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
// Scan opcodes sequence
- while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (opcode > opcodetype.OP_16)
{
IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
// Scan opcodes sequence
- while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
byte[] data = pushArgs.ToArray();
/// <returns>Checking result</returns>
public bool IsPayToScriptHash()
{
+ // Sender provides redeem script hash, receiver provides signature list and redeem script
+ // OP_HASH160 20 [20 byte hash] OP_EQUAL
return (codeBytes.Count() == 23 &&
codeBytes[0] == (byte)opcodetype.OP_HASH160 &&
- codeBytes[1] == 0x14 &&
+ codeBytes[1] == 0x14 && // 20 bytes hash length prefix
codeBytes[22] == (byte)opcodetype.OP_EQUAL);
}
/// <summary>
+ /// Quick test for pay-to-pubkeyhash CScripts
+ /// </summary>
+ /// <returns>Checking result</returns>
+ public bool IsPayToPubKeyHash()
+ {
+ // Sender provides hash of pubkey, receiver provides signature and pubkey
+ // OP_DUP OP_HASH160 20 [20 byte hash] OP_EQUALVERIFY OP_CHECKSIG
+
+ return (codeBytes.Count == 25 &&
+ codeBytes[0] == (byte) opcodetype.OP_DUP &&
+ codeBytes[1] == (byte)opcodetype.OP_HASH160 &&
+ codeBytes[2] == 0x14 && // 20 bytes hash length prefix
+ codeBytes[23] == (byte)opcodetype.OP_EQUALVERIFY &&
+ codeBytes[24] == (byte)opcodetype.OP_CHECKSIG);
+ }
+
+ /// <summary>
/// Pre-version-0.6, Bitcoin always counted CHECKMULTISIGs
/// as 20 sigops. With pay-to-script-hash, that changed:
/// CHECKMULTISIGs serialized in scriptSigs are
opcodetype lastOpcode = opcodetype.OP_INVALIDOPCODE;
// Scan opcodes sequence
- while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (opcode == opcodetype.OP_CHECKSIG || opcode == opcodetype.OP_CHECKSIGVERIFY)
{
{
if (fAccurate && lastOpcode >= opcodetype.OP_1 && lastOpcode <= opcodetype.OP_16)
{
- nCount += ScriptOpcode.DecodeOP_N(lastOpcode);
+ nCount += ScriptCode.DecodeOP_N(lastOpcode);
}
else
{
opcodetype opcode; // Current opcode
IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
- while (ScriptOpcode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+ while (ScriptCode.GetOp(ref wScriptSig, out opcode, out pushArgs))
{
if (opcode > opcodetype.OP_16)
{
public void SetMultiSig(int nRequired, IEnumerable<CPubKey> keys)
{
codeBytes.Clear();
- AddOp(ScriptOpcode.EncodeOP_N(nRequired));
+ AddOp(ScriptCode.EncodeOP_N(nRequired));
foreach (CPubKey key in keys)
{
PushData(key.Public.ToList());
}
- AddOp(ScriptOpcode.EncodeOP_N(keys.Count()));
+ AddOp(ScriptCode.EncodeOP_N(keys.Count()));
AddOp(opcodetype.OP_CHECKMULTISIG);
}
/// <summary>
+ /// Access to scrypt code.
+ /// </summary>
+ public IEnumerable<byte> Enumerable
+ {
+ get { return codeBytes; }
+ }
+
+ /// <summary>
/// Disassemble current script code
/// </summary>
/// <returns>Code listing</returns>
opcodetype opcode; // Current opcode
IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
- while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (sb.Length != 0)
{
if (0 <= opcode && opcode <= opcodetype.OP_PUSHDATA4)
{
- sb.Append(ScriptOpcode.ValueString(pushArgs));
+ sb.Append(ScriptCode.ValueString(pushArgs));
}
else
{
- sb.Append(ScriptOpcode.GetOpName(opcode));
+ sb.Append(ScriptCode.GetOpName(opcode));
}
}
OP_INVALIDOPCODE = 0xff,
};
- public static class ScriptOpcode
+ /// <summary>
+ /// Transaction output types.
+ /// </summary>
+ public enum txnouttype
+ {
+ TX_NONSTANDARD,
+
+ // 'standard' transaction types:
+ TX_PUBKEY,
+ TX_PUBKEYHASH,
+ TX_SCRIPTHASH,
+ TX_MULTISIG,
+ TX_NULL_DATA,
+ };
+
+ public static class ScriptCode
{
/// <summary>
return (opcodetype)(opcodetype.OP_1 + n - 1);
}
+ public static bool Solver(CScript scriptPubKey, out txnouttype typeRet, out IList<IEnumerable<byte>> solutions)
+ {
+ solutions = new List<IEnumerable<byte>>();
+
+ // There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types:
+
+ // It is always OP_HASH160 20 [20 byte hash] OP_EQUAL
+ if (scriptPubKey.IsPayToScriptHash())
+ {
+ typeRet = txnouttype.TX_SCRIPTHASH;
+
+ // Take 20 bytes with offset of 2 bytes
+ IEnumerable<byte> hashBytes = scriptPubKey.Enumerable.Skip(2).Take(20);
+ solutions.Add(hashBytes);
+
+ return true;
+ }
+
+ // It is always OP_DUP OP_HASH160 20 [20 byte hash] OP_EQUALVERIFY OP_CHECKSIG
+ if (scriptPubKey.IsPayToPubKeyHash())
+ {
+ typeRet = txnouttype.TX_PUBKEYHASH;
+
+ // Take 20 bytes with offset of 3 bytes
+ IEnumerable<byte> hashBytes = scriptPubKey.Enumerable.Skip(3).Take(20);
+ solutions.Add(hashBytes);
+
+ return true;
+ }
+
+ List<Tuple<txnouttype, IEnumerable<byte>>> templateTuples = new List<Tuple<txnouttype, IEnumerable<byte>>>();
+
+ // Sender provides pubkey, receiver adds signature
+ // [ECDSA public key] OP_CHECKSIG
+ templateTuples.Add(
+ new Tuple<txnouttype, IEnumerable<byte>>(
+ txnouttype.TX_PUBKEY,
+ new byte[] { (byte)opcodetype.OP_PUBKEY, (byte)opcodetype.OP_CHECKSIG })
+ );
+
+ // Sender provides N pubkeys, receivers provides M signatures
+ // N [pubkey1] [pubkey2] ... [pubkeyN] M OP_CHECKMULTISIG
+ // Where N and M are small integer opcodes (OP1 ... OP_16)
+ templateTuples.Add(
+ new Tuple<txnouttype, IEnumerable<byte>>(
+ txnouttype.TX_MULTISIG,
+ new byte[] { (byte)opcodetype.OP_SMALLINTEGER, (byte)opcodetype.OP_PUBKEYS, (byte)opcodetype.OP_SMALLINTEGER, (byte)opcodetype.OP_CHECKMULTISIG })
+ );
+
+ // Data-carrying output
+ // OP_RETURN [up to 80 bytes of data]
+ templateTuples.Add(
+ new Tuple<txnouttype, IEnumerable<byte>>(
+ txnouttype.TX_NULL_DATA,
+ new byte[] { (byte)opcodetype.OP_RETURN, (byte)opcodetype.OP_SMALLDATA })
+ );
+
+ // Nonstandard tx output
+ typeRet = txnouttype.TX_NONSTANDARD;
+
+ foreach (Tuple<txnouttype, IEnumerable<byte>> templateTuple in templateTuples)
+ {
+ CScript script2 = new CScript(templateTuple.Item2);
+ CScript script1 = scriptPubKey;
+
+ opcodetype opcode1, opcode2;
+
+ // Compare
+ WrappedList<byte> wl1 = script1.GetWrappedList();
+ WrappedList<byte> wl2 = script2.GetWrappedList();
+
+ IEnumerable<byte> args1, args2;
+
+ byte last1 = script1.Enumerable.Last();
+ byte last2 = script2.Enumerable.Last();
+
+ while (true)
+ {
+ if (wl1.GetItem() == last1 && wl2.GetItem() == last2)
+ {
+ // Found a match
+ typeRet = templateTuple.Item1;
+ if (typeRet == txnouttype.TX_MULTISIG)
+ {
+ // Additional checks for TX_MULTISIG:
+ byte m = solutions.First().First();
+ byte n = solutions.Last().First();
+
+ if (m < 1 || n < 1 || m > n || solutions.Count - 2 != n)
+ {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ if (!GetOp(ref wl1, out opcode1, out args1))
+ {
+ break;
+ }
+ if (!GetOp(ref wl2, out opcode2, out args2))
+ {
+ break;
+ }
+
+ // Template matching opcodes:
+ if (opcode2 == opcodetype.OP_PUBKEYS)
+ {
+ while (args1.Count() >= 33 && args1.Count() <= 120)
+ {
+ solutions.Add(args1);
+ if (!GetOp(ref wl1, out opcode1, out args1))
+ {
+ break;
+ }
+ }
+ if (!GetOp(ref wl2, out opcode2, out args2))
+ break;
+ // Normal situation is to fall through
+ // to other if/else statements
+ }
+ if (opcode2 == opcodetype.OP_PUBKEY)
+ {
+ if (args1.Count() < 33 || args1.Count() > 120)
+ {
+ break;
+ }
+ solutions.Add(args1);
+ }
+ else if (opcode2 == opcodetype.OP_PUBKEYHASH)
+ {
+ if (args1.Count() != 20) // hash160 size
+ {
+ break;
+ }
+ solutions.Add(args1);
+ }
+ else if (opcode2 == opcodetype.OP_SMALLINTEGER)
+ {
+ // Single-byte small integer pushed onto solutions
+ if (opcode1 == opcodetype.OP_0 || (opcode1 >= opcodetype.OP_1 && opcode1 <= opcodetype.OP_16))
+ {
+ byte n = (byte)DecodeOP_N(opcode1);
+ solutions.Add(new byte[] { n });
+ }
+ else
+ {
+ break;
+ }
+ }
+ else if (opcode2 == opcodetype.OP_SMALLDATA)
+ {
+ // small pushdata, <= 80 bytes
+ if (args1.Count() > 80)
+ {
+ break;
+ }
+ }
+ else if (opcode1 != opcode2 || args1.SequenceEqual(args2))
+ {
+ // Others must match exactly
+ break;
+ }
+ }
+ }
+
+ solutions.Clear();
+ typeRet = txnouttype.TX_NONSTANDARD;
+ return false;
+ }
};
}
git://git.novaco.in / NovacoinLibrary.git / commitdiff