static uint256 GetHashToSign(Transaction tx, int index, Script scriptCode, long amount)
{
const SigHash sigHash = SigHash.All;
uint256 hashPrevouts = GetHashPrevouts(tx);
uint256 hashSequence = GetHashSequence(tx);
uint256 hashOutputs = GetHashOutputs(tx);
BitcoinStream stream = CreateHashWriter(HashVersion.Witness);
stream.ReadWrite(tx.Version);
// Input prevouts/nSequence (none/all, depending on flags)
stream.ReadWrite(hashPrevouts);
stream.ReadWrite(hashSequence);
// The input being signed (replacing the scriptSig with scriptCode + amount)
// The prevout may already be contained in hashPrevout, and the nSequence
// may already be contain in hashSequence.
stream.ReadWrite(tx.Inputs[index].PrevOut);
stream.ReadWrite(scriptCode);
stream.ReadWrite(amount);
// ReSharper disable once RedundantCast
stream.ReadWrite((uint)tx.Inputs[index].Sequence);
// Outputs (none/one/all, depending on flags)
stream.ReadWrite(hashOutputs);
// Locktime
stream.ReadWriteStruct(tx.LockTime);
// Sighash type
stream.ReadWrite((uint)sigHash);
return(GetHash(stream));
}
private void SerializeTxn(BitcoinStream stream)
{
var version = this.Version;
stream.ReadWrite(ref version);
// POS Timestamp
var time = this.Time;
stream.ReadWrite(ref time);
TxInList vin = this.Inputs;
stream.ReadWrite(ref vin);
vin.Transaction = this;
TxOutList vout = this.Outputs;
stream.ReadWrite(ref vout);
vout.Transaction = this;
LockTime lockTime = this.LockTime;
stream.ReadWriteStruct(ref lockTime);
}
private void DeserializeTxn(BitcoinStream stream)
{
UInt32 nVersionTemp = 0;
stream.ReadWrite(ref nVersionTemp);
// POS time stamp
UInt32 nTimeTemp = 0;
stream.ReadWrite(ref nTimeTemp);
TxInList vinTemp = null;
TxOutList voutTemp = null;
// Try to read the vin.
stream.ReadWrite(ref vinTemp);
vinTemp.Transaction = this;
// Assume a normal vout follows.
stream.ReadWrite(ref voutTemp);
voutTemp.Transaction = this;
LockTime lockTimeTemp = LockTime.Zero;
stream.ReadWriteStruct(ref lockTimeTemp);
this.Version = nVersionTemp;
this.Time = nTimeTemp; // POS Timestamp
vinTemp.ForEach(i => this.Inputs.Add(i));
voutTemp.ForEach(i => this.Outputs.Add(i));
this.LockTime = lockTimeTemp;
}
private void SerializeTxn(BitcoinStream stream, bool witSupported)
{
byte flags = 0;
var version = (witSupported && (this.Inputs.Count == 0 && this.Outputs.Count > 0)) ? this.Version | NoDummyInput : this.Version;
stream.ReadWrite(ref version);
// POS Timestamp
var time = this.Time;
stream.ReadWrite(ref time);
if (witSupported)
{
// Check whether witnesses need to be serialized.
if (HasWitness)
{
flags |= 1;
}
}
if (flags != 0)
{
// Use extended format in case witnesses are to be serialized.
TxInList vinDummy = new TxInList();
stream.ReadWrite <TxInList, TxIn>(ref vinDummy);
stream.ReadWrite(ref flags);
}
TxInList vin = this.Inputs;
stream.ReadWrite <TxInList, TxIn>(ref vin);
vin.Transaction = this;
TxOutList vout = this.Outputs;
stream.ReadWrite <TxOutList, TxOut>(ref vout);
vout.Transaction = this;
if ((flags & 1) != 0)
{
StratisWitness wit = new StratisWitness(this.Inputs);
wit.ReadWrite(stream);
}
LockTime lockTime = this.LockTime;
stream.ReadWriteStruct(ref lockTime);
}
public override void ReadWrite(BitcoinStream stream)
{
stream.ReadWrite(ref nVersion);
stream.ReadWriteStruct(ref nLockTime);
stream.ReadWrite <TxInList, TxIn>(ref vin);
vin.Transaction = this;
stream.ReadWrite <TxOutList, TxOut>(ref vout);
vout.Transaction = this;
if (stream.Type != SerializationType.Hash)
{
Witness wit = new Witness(Inputs);
try
{
wit.ReadWrite(stream);
} catch (FormatException e) {
Console.Out.WriteLine(e.Message);
}
}
}
public override uint256 GetSignatureHash(Script scriptCode, int nIn, SigHash nHashType, TxOut spentOutput, HashVersion sigversion, PrecomputedTransactionData precomputedTransactionData)
{
uint nForkHashType = (uint)nHashType;
if (UsesForkId(nHashType))
{
nForkHashType |= ForkId << 8;
}
if ((SupportSegwit && sigversion == HashVersion.Witness) || UsesForkId(nHashType))
{
if (spentOutput?.Value == null || spentOutput.Value == TxOut.NullMoney)
{
throw new ArgumentException("The output being signed with the amount must be provided", nameof(spentOutput));
}
uint256 hashPrevouts = uint256.Zero;
uint256 hashSequence = uint256.Zero;
uint256 hashOutputs = uint256.Zero;
if ((nHashType & SigHash.AnyoneCanPay) == 0)
{
hashPrevouts = precomputedTransactionData == null?
GetHashPrevouts() : precomputedTransactionData.HashPrevouts;
}
if ((nHashType & SigHash.AnyoneCanPay) == 0 && ((uint)nHashType & 0x1f) != (uint)SigHash.Single && ((uint)nHashType & 0x1f) != (uint)SigHash.None)
{
hashSequence = precomputedTransactionData == null?
GetHashSequence() : precomputedTransactionData.HashSequence;
}
if (((uint)nHashType & 0x1f) != (uint)SigHash.Single && ((uint)nHashType & 0x1f) != (uint)SigHash.None)
{
hashOutputs = precomputedTransactionData == null?
GetHashOutputs() : precomputedTransactionData.HashOutputs;
}
else if (((uint)nHashType & 0x1f) == (uint)SigHash.Single && nIn < this.Outputs.Count)
{
BitcoinStream ss = CreateHashWriter(sigversion);
ss.ReadWrite(this.Outputs[nIn]);
hashOutputs = GetHash(ss);
}
BitcoinStream sss = CreateHashWriter(sigversion);
// Version
sss.ReadWrite(this.Version);
// Input prevouts/nSequence (none/all, depending on flags)
sss.ReadWrite(hashPrevouts);
sss.ReadWrite(hashSequence);
// The input being signed (replacing the scriptSig with scriptCode + amount)
// The prevout may already be contained in hashPrevout, and the nSequence
// may already be contain in hashSequence.
sss.ReadWrite(Inputs[nIn].PrevOut);
sss.ReadWrite(scriptCode);
sss.ReadWrite(spentOutput.Value.Satoshi);
sss.ReadWrite((uint)Inputs[nIn].Sequence);
// Outputs (none/one/all, depending on flags)
sss.ReadWrite(hashOutputs);
// Locktime
sss.ReadWriteStruct(LockTime);
// Sighash type
sss.ReadWrite((uint)nForkHashType);
return(GetHash(sss));
}
if (nIn >= Inputs.Count)
{
return(uint256.One);
}
var hashType = nHashType & (SigHash)31;
// Check for invalid use of SIGHASH_SINGLE
if (hashType == SigHash.Single)
{
if (nIn >= Outputs.Count)
{
return(uint256.One);
}
}
var scriptCopy = scriptCode.Clone();
scriptCode = scriptCopy.FindAndDelete(OpcodeType.OP_CODESEPARATOR);
var txCopy = GetConsensusFactory().CreateTransaction();
txCopy.FromBytes(this.ToBytes());
//Set all TxIn script to empty string
foreach (var txin in txCopy.Inputs)
{
txin.ScriptSig = new Script();
}
//Copy subscript into the txin script you are checking
txCopy.Inputs[nIn].ScriptSig = scriptCopy;
if (hashType == SigHash.None)
{
//The output of txCopy is set to a vector of zero size.
txCopy.Outputs.Clear();
//All other inputs aside from the current input in txCopy have their nSequence index set to zero
foreach (var input in txCopy.Inputs.Where((x, i) => i != nIn))
{
input.Sequence = 0;
}
}
else if (hashType == SigHash.Single)
{
//The output of txCopy is resized to the size of the current input index+1.
txCopy.Outputs.RemoveRange(nIn + 1, txCopy.Outputs.Count - (nIn + 1));
//All other txCopy outputs aside from the output that is the same as the current input index are set to a blank script and a value of (long) -1.
for (var i = 0; i < txCopy.Outputs.Count; i++)
{
if (i == nIn)
{
continue;
}
txCopy.Outputs[i] = new TxOut();
}
//All other txCopy inputs aside from the current input are set to have an nSequence index of zero.
foreach (var input in txCopy.Inputs.Where((x, i) => i != nIn))
{
input.Sequence = 0;
}
}
if ((nHashType & SigHash.AnyoneCanPay) != 0)
{
//The txCopy input vector is resized to a length of one.
var script = txCopy.Inputs[nIn];
txCopy.Inputs.Clear();
txCopy.Inputs.Add(script);
//The subScript (lead in by its length as a var-integer encoded!) is set as the first and only member of this vector.
txCopy.Inputs[0].ScriptSig = scriptCopy;
}
//Serialize TxCopy, append 4 byte hashtypecode
var stream = CreateHashWriter(sigversion);
txCopy.ReadWrite(stream);
stream.ReadWrite((uint)nForkHashType);
return(GetHash(stream));
}
private void DeserializeTxn(BitcoinStream stream, bool witSupported)
{
byte flags = 0;
UInt32 nVersionTemp = 0;
stream.ReadWrite(ref nVersionTemp);
// POS time stamp
uint nTimeTemp = 0;
stream.ReadWrite(ref nTimeTemp);
TxInList vinTemp = new TxInList();
TxOutList voutTemp = new TxOutList();
// Try to read the vin. In case the dummy is there, this will be read as an empty vector.
stream.ReadWrite <TxInList, TxIn>(ref vinTemp);
var hasNoDummy = (nVersionTemp & NoDummyInput) != 0 && vinTemp.Count == 0;
if (witSupported && hasNoDummy)
{
nVersionTemp = nVersionTemp & ~NoDummyInput;
}
if (vinTemp.Count == 0 && witSupported && !hasNoDummy)
{
// We read a dummy or an empty vin.
stream.ReadWrite(ref flags);
if (flags != 0)
{
// Assume we read a dummy and a flag.
stream.ReadWrite <TxInList, TxIn>(ref vinTemp);
vinTemp.Transaction = this;
stream.ReadWrite <TxOutList, TxOut>(ref voutTemp);
voutTemp.Transaction = this;
}
else
{
// Assume read a transaction without output.
voutTemp = new TxOutList();
voutTemp.Transaction = this;
}
}
else
{
// We read a non-empty vin. Assume a normal vout follows.
stream.ReadWrite <TxOutList, TxOut>(ref voutTemp);
voutTemp.Transaction = this;
}
if (((flags & 1) != 0) && witSupported)
{
// The witness flag is present, and we support witnesses.
flags ^= 1;
StratisWitness wit = new StratisWitness(vinTemp);
wit.ReadWrite(stream);
}
if (flags != 0)
{
// Unknown flag in the serialization
throw new FormatException("Unknown transaction optional data");
}
LockTime lockTimeTemp = LockTime.Zero;
stream.ReadWriteStruct(ref lockTimeTemp);
this.Version = nVersionTemp;
this.Time = nTimeTemp; // POS Timestamp
vinTemp.ForEach(i => this.AddInput(i));
voutTemp.ForEach(i => this.AddOutput(i));
this.LockTime = lockTimeTemp;
}
public override uint256 GetSignatureHash(Script scriptCode, int nIn, SigHash nHashType, TxOut spentOutput, HashVersion sigversion, PrecomputedTransactionData precomputedTransactionData)
{
if (sigversion == HashVersion.WitnessV0)
{
if (spentOutput?.Value == null || spentOutput.Value == TxOut.NullMoney)
{
throw new ArgumentException("The output being signed with the amount must be provided", nameof(spentOutput));
}
uint256 hashPrevouts = uint256.Zero;
uint256 hashSequence = uint256.Zero;
uint256 hashOutputs = uint256.Zero;
if ((nHashType & SigHash.AnyoneCanPay) == 0)
{
hashPrevouts = precomputedTransactionData == null?
GetHashPrevouts() : precomputedTransactionData.HashPrevouts;
}
if ((nHashType & SigHash.AnyoneCanPay) == 0 && ((uint)nHashType & 0x1f) != (uint)SigHash.Single && ((uint)nHashType & 0x1f) != (uint)SigHash.None)
{
hashSequence = precomputedTransactionData == null?
GetHashSequence() : precomputedTransactionData.HashSequence;
}
if (((uint)nHashType & 0x1f) != (uint)SigHash.Single && ((uint)nHashType & 0x1f) != (uint)SigHash.None)
{
hashOutputs = precomputedTransactionData == null?
GetHashOutputs() : precomputedTransactionData.HashOutputs;
}
else if (((uint)nHashType & 0x1f) == (uint)SigHash.Single && nIn < this.Outputs.Count)
{
BitcoinStream ss = CreateHashWriter(sigversion);
ss.ReadWrite(this.Outputs[nIn]);
hashOutputs = GetHash(ss);
}
BitcoinStream sss = CreateHashWriter(sigversion);
// Version
sss.ReadWrite(this.Version);
// PoS Time
sss.ReadWrite(this.Time);
// Input prevouts/nSequence (none/all, depending on flags)
sss.ReadWrite(hashPrevouts);
sss.ReadWrite(hashSequence);
// The input being signed (replacing the scriptSig with scriptCode + amount)
// The prevout may already be contained in hashPrevout, and the nSequence
// may already be contain in hashSequence.
sss.ReadWrite(Inputs[nIn].PrevOut);
sss.ReadWrite(scriptCode);
sss.ReadWrite(spentOutput.Value.Satoshi);
sss.ReadWrite(Inputs[nIn].Sequence);
// Outputs (none/one/all, depending on flags)
sss.ReadWrite(hashOutputs);
// Locktime
sss.ReadWriteStruct(LockTime);
// Sighash type
sss.ReadWrite((uint)nHashType);
return(GetHash(sss));
}
bool fAnyoneCanPay = (nHashType & SigHash.AnyoneCanPay) != 0;
bool fHashSingle = ((byte)nHashType & 0x1f) == (byte)SigHash.Single;
bool fHashNone = ((byte)nHashType & 0x1f) == (byte)SigHash.None;
if (nIn >= Inputs.Count)
{
return(uint256.One);
}
if (fHashSingle)
{
if (nIn >= Outputs.Count)
{
return(uint256.One);
}
}
var stream = CreateHashWriter(sigversion);
stream.ReadWrite(Version);
stream.ReadWrite(Time);
uint nInputs = (uint)(fAnyoneCanPay ? 1 : Inputs.Count);
stream.ReadWriteAsVarInt(ref nInputs);
for (int nInput = 0; nInput < nInputs; nInput++)
{
if (fAnyoneCanPay)
{
nInput = nIn;
}
stream.ReadWrite(Inputs[nInput].PrevOut);
if (nInput != nIn)
{
stream.ReadWrite(Script.Empty);
}
else
{
WriteScriptCode(stream, scriptCode);
}
if (nInput != nIn && (fHashSingle || fHashNone))
{
stream.ReadWrite((uint)0);
}
else
{
stream.ReadWrite(Inputs[nInput].Sequence);
}
}
uint nOutputs = (uint)(fHashNone ? 0 : (fHashSingle ? nIn + 1 : Outputs.Count));
stream.ReadWriteAsVarInt(ref nOutputs);
for (int nOutput = 0; nOutput < nOutputs; nOutput++)
{
if (fHashSingle && nOutput != nIn)
{
this.Outputs.CreateNewTxOut().ReadWrite(stream);
}
else
{
Outputs[nOutput].ReadWrite(stream);
}
}
stream.ReadWriteStruct(LockTime);
stream.ReadWrite((uint)nHashType);
return(GetHash(stream));
}
public override void ReadWrite(BitcoinStream stream)
{
bool witSupported = (((uint)stream.TransactionOptions & (uint)TransactionOptions.Witness) != 0) &&
stream.ProtocolVersion >= ProtocolVersion.WITNESS_VERSION;
byte flags = 0;
if (!stream.Serializing)
{
stream.ReadWrite(ref this.nVersion);
// POS time stamp
stream.ReadWrite(ref this.nTime);
/* Try to read the vin. In case the dummy is there, this will be read as an empty vector. */
stream.ReadWrite <TxInList, TxIn>(ref this.vin);
bool hasNoDummy = (this.nVersion & NoDummyInput) != 0 && this.vin.Count == 0;
if (witSupported && hasNoDummy)
{
this.nVersion = this.nVersion & ~NoDummyInput;
}
if (this.vin.Count == 0 && witSupported && !hasNoDummy)
{
/* We read a dummy or an empty vin. */
stream.ReadWrite(ref flags);
if (flags != 0)
{
/* Assume we read a dummy and a flag. */
stream.ReadWrite <TxInList, TxIn>(ref this.vin);
this.vin.Transaction = this;
stream.ReadWrite <TxOutList, TxOut>(ref this.vout);
this.vout.Transaction = this;
}
else
{
/* Assume read a transaction without output. */
this.vout = new TxOutList();
this.vout.Transaction = this;
}
}
else
{
/* We read a non-empty vin. Assume a normal vout follows. */
stream.ReadWrite <TxOutList, TxOut>(ref this.vout);
this.vout.Transaction = this;
}
if (((flags & 1) != 0) && witSupported)
{
/* The witness flag is present, and we support witnesses. */
flags ^= 1;
var wit = new Witness(this.Inputs);
wit.ReadWrite(stream);
}
if (flags != 0)
{
/* Unknown flag in the serialization */
throw new FormatException("Unknown transaction optional data");
}
}
else
{
uint version = (witSupported && (this.vin.Count == 0 && this.vout.Count > 0)) ? this.nVersion | NoDummyInput : this.nVersion;
stream.ReadWrite(ref version);
// the POS time stamp
stream.ReadWrite(ref this.nTime);
if (witSupported)
{
/* Check whether witnesses need to be serialized. */
if (this.HasWitness)
{
flags |= 1;
}
}
if (flags != 0)
{
/* Use extended format in case witnesses are to be serialized. */
var vinDummy = new TxInList();
stream.ReadWrite <TxInList, TxIn>(ref vinDummy);
stream.ReadWrite(ref flags);
}
stream.ReadWrite <TxInList, TxIn>(ref this.vin);
this.vin.Transaction = this;
stream.ReadWrite <TxOutList, TxOut>(ref this.vout);
this.vout.Transaction = this;
if ((flags & 1) != 0)
{
var wit = new Witness(this.Inputs);
wit.ReadWrite(stream);
}
}
stream.ReadWriteStruct(ref this.nLockTime);
}
