protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length < 1)
return false;
if(ops[0].Code != OpcodeType.OP_RETURN)
return false;
if(scriptPubKey.ToBytes(true).Length > MaxScriptSizeLimit)
return false;
return scriptPubKeyOps.Skip(1).All(o => o.PushData != null && !o.IsInvalid);
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length < 1)
return false;
if(ops[0].Code != OpcodeType.OP_RETURN)
return false;
if(ops.Length == 2)
{
return ops[1].PushData != null && ops[1].PushData.Length <= MAX_OPRETURN_SIZE;
}
return true;
}
public const int MAX_OP_RETURN_RELAY = 83; //! bytes (+1 for OP_RETURN, +2 for the pushdata opcodes)
public Script GenerateScriptPubKey(params byte[][] data)
{
if(data == null)
throw new ArgumentNullException("data");
Op[] ops = new Op[data.Length + 1];
ops[0] = OpcodeType.OP_RETURN;
for(int i = 0; i < data.Length; i++)
{
ops[1 + i] = Op.GetPushOp(data[i]);
}
var script = new Script(ops);
if(script.ToBytes(true).Length > MaxScriptSizeLimit)
throw new ArgumentOutOfRangeException("data", "Data in OP_RETURN should have a maximum size of " + MaxScriptSizeLimit + " bytes");
return script;
}
public static Op GetPushOp(byte[] data)
{
Op op = new Op();
op.PushData = data;
if(data.Length == 0)
op.Code = OpcodeType.OP_0;
else if(data.Length == 1 && (byte)1 <= data[0] && data[0] <= (byte)16)
op.Code = (OpcodeType)(data[0] + (byte)OpcodeType.OP_1 - 1);
else if(data.Length == 1 && (byte)0x81 == data[0])
op.Code = OpcodeType.OP_1NEGATE;
else if(0x01 <= data.Length && data.Length <= 0x4b)
op.Code = (OpcodeType)(byte)data.Length;
else if(data.Length <= 0xFF)
op.Code = OpcodeType.OP_PUSHDATA1;
#if !PORTABLE
else if(data.LongLength <= 0xFFFF)
op.Code = OpcodeType.OP_PUSHDATA2;
else if(data.LongLength <= 0xFFFFFFFF)
op.Code = OpcodeType.OP_PUSHDATA4;
#else
else if(data.Length <= 0xFFFF)
op.Code = OpcodeType.OP_PUSHDATA2;
#endif
else
throw new NotSupportedException("Data length should not be bigger than 0xFFFFFFFF");
return op;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
return false;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if(ops.Length != 1)
return false;
return ops[0].PushData != null && TransactionSignature.IsValid(ops[0].PushData);
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
return true;
}
internal static byte[] ReadData(Op op, Stream stream, bool ignoreWrongPush = false)
{
var opcode = op.Code;
uint len = 0;
BitcoinStream bitStream = new BitcoinStream(stream, false);
if (opcode == 0)
{
return(new byte[0]);
}
if ((byte)OpcodeType.OP_1 <= (byte)opcode && (byte)opcode <= (byte)OpcodeType.OP_16)
{
return(new byte[] { (byte)(opcode - OpcodeType.OP_1 + 1) });
}
if (opcode == OpcodeType.OP_1NEGATE)
{
return(new byte[] { 0x81 });
}
try
{
if (0x01 <= (byte)opcode && (byte)opcode <= 0x4b)
{
len = (uint)opcode;
}
else if (opcode == OpcodeType.OP_PUSHDATA1)
{
len = bitStream.ReadWrite((byte)0);
}
else if (opcode == OpcodeType.OP_PUSHDATA2)
{
len = bitStream.ReadWrite((ushort)0);
}
else if (opcode == OpcodeType.OP_PUSHDATA4)
{
len = bitStream.ReadWrite((uint)0);
}
else
{
throw new FormatException("Invalid opcode for pushing data : " + opcode);
}
}
catch (EndOfStreamException)
{
if (!ignoreWrongPush)
{
throw new FormatException("Incomplete script");
}
op.IncompleteData = true;
return(new byte[0]);
}
if (stream.CanSeek && stream.Length - stream.Position < len)
{
len = (uint)(stream.Length - stream.Position);
if (!ignoreWrongPush)
{
throw new FormatException("Not enough bytes pushed with " + opcode.ToString() + " expected " + len + " but got " + len);
}
op.IncompleteData = true;
}
byte[] data = new byte[len];
var readen = stream.Read(data, 0, data.Length);
if (readen != data.Length && !ignoreWrongPush)
{
throw new FormatException("Not enough bytes pushed with " + opcode.ToString() + " expected " + len + " but got " + readen);
}
else if (readen != data.Length)
{
op.IncompleteData = true;
Array.Resize(ref data, readen);
}
return(data);
}
public Script GenerateScriptSig(Op[] ops, Script redeemScript)
{
var pushScript = Op.GetPushOp(redeemScript._Script);
return new Script(ops.Concat(new[] { pushScript }));
}
public WitScript GenerateWitScript(Op[] scriptSig, Script redeemScript)
{
if(redeemScript == null)
throw new ArgumentNullException("redeemScript");
if(scriptSig == null)
throw new ArgumentNullException("scriptSig");
var ops = scriptSig.Concat(new[] { Op.GetPushOp(redeemScript.ToBytes(true)) }).ToArray();
return new WitScript(ops);
}
internal int FindAndDelete(Op op)
{
return op == null ? 0 : FindAndDelete(o => o.Code == op.Code && Utils.ArrayEqual(o.PushData, op.PushData));
}
/// <summary>
/// Mines a new genesis block, to use with a new network.
/// Typically, 3 such genesis blocks need to be created when bootstrapping a new coin: for Main, Test and Reg networks.
/// </summary>
/// <param name="consensusFactory">
/// The consensus factory used to create transactions and blocks.
/// Use <see cref="PosConsensusFactory"/> for proof-of-stake based networks.
/// </param>
/// <param name="coinbaseText">
/// Traditionally a news headline from the day of the launch, but could be any string or link.
/// This will be inserted in the input coinbase transaction script.
/// It should be shorter than 92 characters.
/// </param>
/// <param name="target">
/// The difficulty target under which the hash of the block need to be.
/// Some more details: As an example, the target for the Stratis Main network is 00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff.
/// To make it harder to mine the genesis block, have more zeros at the beginning (keeping the length the same). This will make the target smaller, so finding a number under it will be more difficult.
/// To make it easier to mine the genesis block ,do the opposite. Example of an easy one: 00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff.
/// Make the Test and Reg targets ones easier to find than the Main one so that you don't wait too long to mine the genesis block.
/// </param>
/// <param name="genesisReward">
/// Specify how many coins to put in the genesis transaction's output. These coins are unspendable.
/// </param>
/// <param name="version">
/// The version of the transaction and the block header set in the genesis block.
/// </param>
/// <example>
/// The following example shows the creation of a genesis block.
/// <code>
/// Block genesis = MineGenesisBlock(new PosConsensusFactory(), "Some topical headline.", new Target(new uint256("000fffff00000000000000000000000000000000000000000000000000000000")), Money.Coins(50m));
/// BlockHeader header = genesis.Header;
/// Console.WriteLine("Make a note of the following values:");
/// Console.WriteLine("bits: " + header.Bits);
/// Console.WriteLine("nonce: " + header.Nonce);
/// Console.WriteLine("time: " + header.Time);
/// Console.WriteLine("version: " + header.Version);
/// Console.WriteLine("hash: " + header.GetHash());
/// Console.WriteLine("merkleroot: " + header.HashMerkleRoot);
/// </code>
/// </example>
/// <returns>A genesis block.</returns>
public static Block MineGenesisBlock(ConsensusFactory consensusFactory, string coinbaseText, Target target, Money genesisReward, int version = 1)
{
if (consensusFactory == null)
{
throw new ArgumentException($"Parameter '{nameof(consensusFactory)}' cannot be null. Use 'new ConsensusFactory()' for Bitcoin-like proof-of-work blockchains and 'new PosConsensusFactory()' for Stratis-like proof-of-stake blockchains.");
}
if (string.IsNullOrEmpty(coinbaseText))
{
throw new ArgumentException($"Parameter '{nameof(coinbaseText)}' cannot be null. Use a news headline or any other appropriate string.");
}
if (target == null)
{
throw new ArgumentException($"Parameter '{nameof(target)}' cannot be null. Example use: new Target(new uint256(\"0000ffff00000000000000000000000000000000000000000000000000000000\"))");
}
if (coinbaseText.Length >= 92)
{
throw new ArgumentException($"Parameter '{nameof(coinbaseText)}' should be shorter than 92 characters.");
}
if (genesisReward == null)
{
throw new ArgumentException($"Parameter '{nameof(genesisReward)}' cannot be null. Example use: 'Money.Coins(50m)'.");
}
DateTimeOffset time = DateTimeOffset.Now;
uint unixTime = Utils.DateTimeToUnixTime(time);
Transaction txNew = consensusFactory.CreateTransaction();
txNew.Version = (uint)version;
txNew.Time = unixTime;
txNew.AddInput(new TxIn()
{
ScriptSig = new Script(
Op.GetPushOp(0),
new Op()
{
Code = (OpcodeType)0x1,
PushData = new[] { (byte)42 }
},
Op.GetPushOp(Encoders.ASCII.DecodeData(coinbaseText)))
});
txNew.AddOutput(new TxOut()
{
Value = genesisReward,
});
Block genesis = consensusFactory.CreateBlock();
genesis.Header.BlockTime = time;
genesis.Header.Bits = target;
genesis.Header.Nonce = 0;
genesis.Header.Version = version;
genesis.Transactions.Add(txNew);
genesis.Header.HashPrevBlock = uint256.Zero;
genesis.UpdateMerkleRoot();
// Iterate over the nonce until the proof-of-work is valid.
// This will mean the block header hash is under the target.
while (!genesis.CheckProofOfWork())
{
genesis.Header.Nonce++;
if (genesis.Header.Nonce == 0)
{
genesis.Header.Time++;
}
}
return(genesis);
}
private static Block CreateGenesisBlock(uint nTime, uint nNonce, uint nBits, int nVersion, Money genesisReward)
{
string pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
Script genesisOutputScript = new Script(Op.GetPushOp(Encoders.Hex.DecodeData("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f")), OpcodeType.OP_CHECKSIG);
return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
}
public Script GenerateScriptSig(TransactionSignature signature)
{
return(new Script(
Op.GetPushOp(signature.ToBytes())
));
}
public Script GenerateScriptSig(Op[] ops, Script redeemScript)
{
var pushScript = Op.GetPushOp(redeemScript._Script);
return(new Script(ops.Concat(new[] { pushScript })));
}
public TransactionSignature[] GetMultisigSignatures()
{
return(PayToMultiSigTemplate.Instance.ExtractScriptSigParameters(new Script(Pushes.Select(p => Op.GetPushOp(p)).ToArray())));
}
internal int FindAndDelete(Op op)
{
return(op == null ? 0 : FindAndDelete(o => o.Code == op.Code && Utils.ArrayEqual(o.PushData, op.PushData)));
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length < 3)
return false;
var sigCount = ops[0];
if(!sigCount.IsSmallUInt)
return false;
var pubKeyCount = ops[ops.Length - 2];
if(!pubKeyCount.IsSmallUInt)
return false;
var keyCount = (uint)pubKeyCount.GetValue();
if(1 + keyCount + 1 + 1 != ops.Length)
return false;
for(int i = 1; i < keyCount + 1; i++)
{
if(ops[i].PushData == null)
return false;
}
return ops[ops.Length - 1].Code == OpcodeType.OP_CHECKMULTISIG;
}
internal static byte[] ReadData(Op op, Stream stream, bool ignoreWrongPush = false)
{
var opcode = op.Code;
uint len = 0;
BitcoinStream bitStream = new BitcoinStream(stream, false);
if(opcode == 0)
return new byte[0];
if((byte)OpcodeType.OP_1 <= (byte)opcode && (byte)opcode <= (byte)OpcodeType.OP_16)
{
return new byte[] { (byte)(opcode - OpcodeType.OP_1 + 1) };
}
if(opcode == OpcodeType.OP_1NEGATE)
{
return new byte[] { 0x81 };
}
if(0x01 <= (byte)opcode && (byte)opcode <= 0x4b)
len = (uint)opcode;
else if(opcode == OpcodeType.OP_PUSHDATA1)
len = bitStream.ReadWrite((byte)0);
else if(opcode == OpcodeType.OP_PUSHDATA2)
len = bitStream.ReadWrite((ushort)0);
else if(opcode == OpcodeType.OP_PUSHDATA4)
len = bitStream.ReadWrite((uint)0);
else
throw new FormatException("Invalid opcode for pushing data : " + opcode);
byte[] data = new byte[len];
var readen = stream.Read(data, 0, data.Length);
if(readen != data.Length && !ignoreWrongPush)
throw new FormatException("Not enough bytes pushed with " + opcode.ToString() + " expected " + len + " but got " + readen);
else if(readen != data.Length)
{
op.IncompleteData = true;
Array.Resize(ref data, readen);
}
return data;
}
public int FindAndDelete(Op op)
{
if(op == null)
return 0;
return FindAndDelete(o => o.Code == op.Code && Utils.ArrayEqual(o.PushData, op.PushData));
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
throw new NotImplementedException();
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
if(scriptPubKeyOps.Length != 2)
return false;
var allPush = scriptPubKeyOps.All(o => o.PushData != null);
if(!allPush)
return false;
return true;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
if(!scriptSig.IsPushOnly)
return false;
if(scriptSigOps[0].Code != OpcodeType.OP_0)
return false;
if(scriptSigOps.Length == 1)
return false;
if(!scriptSigOps.Skip(1).All(s => TransactionSignature.ValidLength(s.PushData.Length) || s.Code == OpcodeType.OP_0))
return false;
if(scriptPubKeyOps != null)
{
if(!CheckScriptPubKeyCore(scriptPubKey, scriptPubKeyOps))
return false;
var sigCountExpected = scriptPubKeyOps[0].GetValue();
return sigCountExpected == scriptSigOps.Length + 1;
}
return true;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
return scriptSig.Length == 0;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if(ops.Length == 0)
return false;
if(!scriptSig.IsPushOnly)
return false;
if(scriptPubKey != null)
{
var expectedHash = ExtractScriptPubKeyParameters(scriptPubKey);
if(expectedHash == null)
return false;
if(expectedHash != Script.FromBytesUnsafe(ops[ops.Length - 1].PushData).Hash)
return false;
}
var redeemBytes = ops[ops.Length - 1].PushData;
if(redeemBytes.Length > 520)
return false;
return Script.FromBytesUnsafe(ops[ops.Length - 1].PushData).IsValid;
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length != 3)
return false;
return ops[0].Code == OpcodeType.OP_HASH160 &&
ops[1].Code == (OpcodeType)0x14 &&
ops[2].Code == OpcodeType.OP_EQUAL;
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
return scriptPubKeyOps.Skip(1).All(o => o.PushData != null && !o.IsInvalid);
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length != 2)
return false;
return ops[0].PushData != null && PubKey.Check(ops[0].PushData, false) &&
ops[1].Code == OpcodeType.OP_CHECKSIG;
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if(ops.Length != 2)
return false;
return ops[0].PushData != null &&
((ops[0].Code == OpcodeType.OP_0) || TransactionSignature.IsValid(ops[0].PushData, ScriptVerify.None)) &&
ops[1].PushData != null && PubKey.Check(ops[1].PushData, false);
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if(ops.Length != 5)
return false;
return ops[0].Code == OpcodeType.OP_DUP &&
ops[1].Code == OpcodeType.OP_HASH160 &&
ops[2].PushData != null && ops[2].PushData.Length == 0x14 &&
ops[3].Code == OpcodeType.OP_EQUALVERIFY &&
ops[4].Code == OpcodeType.OP_CHECKSIG;
}
protected abstract bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps);
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if(ops.Length != 2)
return false;
return ops[0].PushData != null &&
ops[1].PushData != null && PubKey.Check(ops[1].PushData, false);
}
public WitScript GenerateWitScript(Op[] scriptSig, Script redeemScript)
{
if(redeemScript == null)
throw new ArgumentNullException("redeemScript");
if(scriptSig == null)
throw new ArgumentNullException("scriptSig");
return GenerateWitScript(new Script(scriptSig), redeemScript);
}
public Script GenerateScriptSig(Op[] ops, Script script)
{
var pushScript = Op.GetPushOp(script._Script);
return new Script(ops.Concat(new[] { pushScript }).ToArray());
}
public Op Read()
{
var b = Inner.ReadByte();
if(b == -1)
return null;
var opcode = (OpcodeType)b;
if(Op.IsPushCode(opcode))
{
Op op = new Op();
op.Code = opcode;
op.PushData = op.ReadData(Inner);
return op;
}
return new Op()
{
Code = opcode
};
}
private static Script CombineMultisig(Script scriptPubKey, Transaction transaction, int n, byte[][] sigs1, byte[][] sigs2)
{
// Combine all the signatures we've got:
List <TransactionSignature> allsigs = new List <TransactionSignature>();
foreach (var v in sigs1)
{
if (TransactionSignature.IsValid(v))
{
allsigs.Add(new TransactionSignature(v));
}
}
foreach (var v in sigs2)
{
if (TransactionSignature.IsValid(v))
{
allsigs.Add(new TransactionSignature(v));
}
}
var multiSigParams = PayToMultiSigTemplate.Instance.ExtractScriptPubKeyParameters(scriptPubKey);
if (multiSigParams == null)
{
throw new InvalidOperationException("The scriptPubKey is not a valid multi sig");
}
Dictionary <PubKey, TransactionSignature> sigs = new Dictionary <PubKey, TransactionSignature>();
foreach (var sig in allsigs)
{
foreach (var pubkey in multiSigParams.PubKeys)
{
if (sigs.ContainsKey(pubkey))
{
continue; // Already got a sig for this pubkey
}
ScriptEvaluationContext eval = new ScriptEvaluationContext();
if (eval.CheckSig(sig.ToBytes(), pubkey.ToBytes(), scriptPubKey, transaction, n))
{
sigs.AddOrReplace(pubkey, sig);
}
}
}
// Now build a merged CScript:
int nSigsHave = 0;
Script result = new Script(OpcodeType.OP_0); // pop-one-too-many workaround
foreach (var pubkey in multiSigParams.PubKeys)
{
if (sigs.ContainsKey(pubkey))
{
result += Op.GetPushOp(sigs[pubkey].ToBytes());
nSigsHave++;
}
if (nSigsHave >= multiSigParams.SignatureCount)
{
break;
}
}
// Fill any missing with OP_0:
for (int i = nSigsHave; i < multiSigParams.SignatureCount; i++)
{
result += OpcodeType.OP_0;
}
return(result);
}
