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various fixes to psbt serialisation and wallet tx creation

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This commit is contained in:
Craig Raw 2020-07-26 14:02:47 +02:00
parent 0466755883
commit 15beeefcb6
7 changed files with 130 additions and 61 deletions
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16
src/main/java/com/sparrowwallet/drongo/KeyDerivation.java
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@ -9,7 +9,7 @@ import java.util.List;
public class KeyDerivation {
private final String masterFingerprint;
private final String derivationPath;
private final transient List<ChildNumber> derivation;
private transient List<ChildNumber> derivation;
public KeyDerivation(String masterFingerprint, String derivationPath) {
this.masterFingerprint = masterFingerprint == null ? null : masterFingerprint.toLowerCase();
@ -26,12 +26,20 @@ public class KeyDerivation {
}
public List<ChildNumber> getDerivation() {
if(derivation == null) {
derivation = parsePath(derivationPath);
}
return Collections.unmodifiableList(derivation);
}
public KeyDerivation extend(ChildNumber childNumber) {
List<ChildNumber> extendedDerivation = new ArrayList<>(derivation);
extendedDerivation.add(childNumber);
public KeyDerivation extend(ChildNumber extension) {
return extend(List.of(extension));
}
public KeyDerivation extend(List<ChildNumber> extension) {
List<ChildNumber> extendedDerivation = new ArrayList<>(getDerivation());
extendedDerivation.addAll(extension);
return new KeyDerivation(masterFingerprint, writePath(extendedDerivation));
}

102
src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java
View file

@ -146,17 +146,32 @@ public class Transaction extends ChildMessage {
this.segwitVersion = segwitVersion;
}
public void clearSegwit() {
if(segwit) {
adjustLength(-2);
segwit = false;
}
}
public boolean hasWitnesses() {
for (TransactionInput in : inputs)
if (in.hasWitness())
for(TransactionInput in : inputs) {
if(in.hasWitness()) {
return true;
}
}
return false;
}
public byte[] bitcoinSerialize() {
boolean useWitnessFormat = isSegwit();
return bitcoinSerialize(useWitnessFormat);
}
public byte[] bitcoinSerialize(boolean useWitnessFormat) {
try {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
bitcoinSerializeToStream(outputStream);
bitcoinSerializeToStream(outputStream, useWitnessFormat);
return outputStream.toByteArray();
} catch (IOException e) {
//can't happen
@ -166,8 +181,8 @@ public class Transaction extends ChildMessage {
}
public void bitcoinSerializeToStream(OutputStream stream) throws IOException {
boolean useSegwit = isSegwit();
bitcoinSerializeToStream(stream, useSegwit);
boolean useWitnessFormat = isSegwit();
bitcoinSerializeToStream(stream, useWitnessFormat);
}
/**
@ -175,30 +190,40 @@ public class Transaction extends ChildMessage {
* <a href="https://en.bitcoin.it/wiki/Protocol_documentation#tx">classic format</a>, depending on if segwit is
* desired.
*/
protected void bitcoinSerializeToStream(OutputStream stream, boolean useSegwit) throws IOException {
protected void bitcoinSerializeToStream(OutputStream stream, boolean useWitnessFormat) throws IOException {
// version
uint32ToByteStreamLE(version, stream);
// marker, flag
if (useSegwit) {
if(useWitnessFormat) {
stream.write(0);
stream.write(segwitVersion);
}
// txin_count, txins
stream.write(new VarInt(inputs.size()).encode());
for (TransactionInput in : inputs)
for(TransactionInput in : inputs) {
in.bitcoinSerializeToStream(stream);
}
// txout_count, txouts
stream.write(new VarInt(outputs.size()).encode());
for (TransactionOutput out : outputs)
for(TransactionOutput out : outputs) {
out.bitcoinSerializeToStream(stream);
}
// script_witnesses
if (useSegwit) {
for (TransactionInput in : inputs) {
if (in.hasWitness()) {
in.getWitness().bitcoinSerializeToStream(stream);
if(useWitnessFormat) {
for(TransactionInput in : inputs) {
//Per BIP141 all txins must have a witness
if(!in.hasWitness()) {
in.setWitness(new TransactionWitness(this));
}
in.getWitness().bitcoinSerializeToStream(stream);
}
}
// lock_time
uint32ToByteStreamLE(locktime, stream);
}
@ -333,6 +358,10 @@ public class Transaction extends ChildMessage {
return Collections.unmodifiableList(outputs);
}
public void shuffleOutputs() {
Collections.shuffle(outputs);
}
public TransactionOutput addOutput(long value, Script script) {
return addOutput(new TransactionOutput(this, value, script));
}
@ -401,11 +430,11 @@ public class Transaction extends ChildMessage {
return version > 0 && version < 5;
}
public Sha256Hash hashForSignature(int inputIndex, Script redeemScript, SigHash sigHash) {
return hashForSignature(inputIndex, redeemScript.getProgram(), sigHash.value);
public Sha256Hash hashForLegacySignature(int inputIndex, Script redeemScript, SigHash sigHash) {
return hashForLegacySignature(inputIndex, redeemScript.getProgram(), sigHash.value);
}
public Sha256Hash hashForSignature(int inputIndex, byte[] connectedScript, byte sigHashType) {
public Sha256Hash hashForLegacySignature(int inputIndex, byte[] connectedScript, byte sigHashType) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
this.bitcoinSerializeToStream(baos);
@ -417,7 +446,6 @@ public class Transaction extends ChildMessage {
for (int i = 0; i < tx.inputs.size(); i++) {
TransactionInput input = tx.inputs.get(i);
input.clearScriptBytes();
input.clearWitness();
}
// This step has no purpose beyond being synchronized with Bitcoin Core's bugs. OP_CODESEPARATOR
@ -432,16 +460,18 @@ public class Transaction extends ChildMessage {
TransactionInput input = tx.inputs.get(inputIndex);
input.setScriptBytes(connectedScript);
if ((sigHashType & 0x1f) == SigHash.NONE.value) {
if((sigHashType & 0x1f) == SigHash.NONE.value) {
// SIGHASH_NONE means no outputs are signed at all - the signature is effectively for a "blank cheque".
tx.outputs = new ArrayList<>(0);
// The signature isn't broken by new versions of the transaction issued by other parties.
for (int i = 0; i < tx.inputs.size(); i++)
if (i != inputIndex)
for(int i = 0; i < tx.inputs.size(); i++) {
if(i != inputIndex) {
tx.inputs.get(i).setSequenceNumber(0);
} else if ((sigHashType & 0x1f) == SigHash.SINGLE.value) {
}
}
} else if((sigHashType & 0x1f) == SigHash.SINGLE.value) {
// SIGHASH_SINGLE means only sign the output at the same index as the input (ie, my output).
if (inputIndex >= tx.outputs.size()) {
if(inputIndex >= tx.outputs.size()) {
// The input index is beyond the number of outputs, it's a buggy signature made by a broken
// Bitcoin implementation. Bitcoin Core also contains a bug in handling this case:
// any transaction output that is signed in this case will result in both the signed output
@ -455,15 +485,18 @@ public class Transaction extends ChildMessage {
// In SIGHASH_SINGLE the outputs after the matching input index are deleted, and the outputs before
// that position are "nulled out". Unintuitively, the value in a "null" transaction is set to -1.
tx.outputs = new ArrayList<>(tx.outputs.subList(0, inputIndex + 1));
for (int i = 0; i < inputIndex; i++)
tx.outputs.set(i, new TransactionOutput(tx, -1L, new byte[] {}));
for(int i = 0; i < inputIndex; i++) {
tx.outputs.set(i, new TransactionOutput(tx, -1L, new byte[]{}));
}
// The signature isn't broken by new versions of the transaction issued by other parties.
for (int i = 0; i < tx.inputs.size(); i++)
if (i != inputIndex)
for(int i = 0; i < tx.inputs.size(); i++) {
if(i != inputIndex) {
tx.inputs.get(i).setSequenceNumber(0);
}
}
}
if ((sigHashType & SigHash.ANYONECANPAY.value) == SigHash.ANYONECANPAY.value) {
if((sigHashType & SigHash.ANYONECANPAY.value) == SigHash.ANYONECANPAY.value) {
// SIGHASH_ANYONECANPAY means the signature in the input is not broken by changes/additions/removals
// of other inputs. For example, this is useful for building assurance contracts.
tx.inputs = new ArrayList<>();
@ -510,38 +543,39 @@ public class Transaction extends ChildMessage {
boolean anyoneCanPay = (sigHashType & SigHash.ANYONECANPAY.value) == SigHash.ANYONECANPAY.value;
boolean signAll = (basicSigHashType != SigHash.SINGLE.value) && (basicSigHashType != SigHash.NONE.value);
if (!anyoneCanPay) {
if(!anyoneCanPay) {
ByteArrayOutputStream bosHashPrevouts = new UnsafeByteArrayOutputStream(256);
for (int i = 0; i < this.inputs.size(); ++i) {
for(int i = 0; i < this.inputs.size(); ++i) {
bosHashPrevouts.write(this.inputs.get(i).getOutpoint().getHash().getReversedBytes());
uint32ToByteStreamLE(this.inputs.get(i).getOutpoint().getIndex(), bosHashPrevouts);
}
hashPrevouts = Sha256Hash.hashTwice(bosHashPrevouts.toByteArray());
}
if (!anyoneCanPay && signAll) {
if(!anyoneCanPay && signAll) {
ByteArrayOutputStream bosSequence = new UnsafeByteArrayOutputStream(256);
for (int i = 0; i < this.inputs.size(); ++i) {
for(int i = 0; i < this.inputs.size(); ++i) {
uint32ToByteStreamLE(this.inputs.get(i).getSequenceNumber(), bosSequence);
}
hashSequence = Sha256Hash.hashTwice(bosSequence.toByteArray());
}
if (signAll) {
if(signAll) {
ByteArrayOutputStream bosHashOutputs = new UnsafeByteArrayOutputStream(256);
for (int i = 0; i < this.outputs.size(); ++i) {
for(int i = 0; i < this.outputs.size(); ++i) {
uint64ToByteStreamLE(BigInteger.valueOf(this.outputs.get(i).getValue()), bosHashOutputs);
bosHashOutputs.write(new VarInt(this.outputs.get(i).getScriptBytes().length).encode());
bosHashOutputs.write(this.outputs.get(i).getScriptBytes());
}
hashOutputs = Sha256Hash.hashTwice(bosHashOutputs.toByteArray());
} else if (basicSigHashType == SigHash.SINGLE.value && inputIndex < outputs.size()) {
} else if(basicSigHashType == SigHash.SINGLE.value && inputIndex < outputs.size()) {
ByteArrayOutputStream bosHashOutputs = new UnsafeByteArrayOutputStream(256);
uint64ToByteStreamLE(BigInteger.valueOf(this.outputs.get(inputIndex).getValue()), bosHashOutputs);
bosHashOutputs.write(new VarInt(this.outputs.get(inputIndex).getScriptBytes().length).encode());
bosHashOutputs.write(this.outputs.get(inputIndex).getScriptBytes());
hashOutputs = Sha256Hash.hashTwice(bosHashOutputs.toByteArray());
}
uint32ToByteStreamLE(version, bos);
bos.write(hashPrevouts);
bos.write(hashSequence);

4
src/main/java/com/sparrowwallet/drongo/protocol/TransactionInput.java
View file

@ -110,10 +110,6 @@ public class TransactionInput extends ChildMessage {
this.witness = witness;
}
public void clearWitness() {
setWitness(null);
}
public boolean hasWitness() {
return witness != null;
}

5
src/main/java/com/sparrowwallet/drongo/protocol/TransactionOutput.java
View file

@ -8,13 +8,8 @@ import java.io.IOException;
import java.io.OutputStream;
public class TransactionOutput extends ChildMessage {
// The output's value is kept as a native type in order to save class instances.
private long value;
// A transaction output has a script used for authenticating that the redeemer is allowed to spend
// this output.
private byte[] scriptBytes;
private Script script;
private Address[] addresses = new Address[0];

48
src/main/java/com/sparrowwallet/drongo/psbt/PSBT.java
View file

@ -3,6 +3,7 @@ package com.sparrowwallet.drongo.psbt;
import com.sparrowwallet.drongo.ExtendedKey;
import com.sparrowwallet.drongo.KeyDerivation;
import com.sparrowwallet.drongo.Utils;
import com.sparrowwallet.drongo.address.Address;
import com.sparrowwallet.drongo.crypto.ECKey;
import com.sparrowwallet.drongo.protocol.*;
import com.sparrowwallet.drongo.wallet.*;
@ -58,17 +59,33 @@ public class PSBT {
}
public PSBT(WalletTransaction walletTransaction) {
this(walletTransaction, null, true);
}
public PSBT(WalletTransaction walletTransaction, Integer version, boolean includeGlobalXpubs) {
Wallet wallet = walletTransaction.getWallet();
transaction = new Transaction(walletTransaction.getTransaction().bitcoinSerialize());
//Clear segwit marker & flag, scriptSigs and all witness data as per BIP174
transaction.clearSegwit();
for(TransactionInput input : transaction.getInputs()) {
input.clearScriptBytes();
input.clearWitness();
input.setWitness(null);
}
for(Keystore keystore : walletTransaction.getWallet().getKeystores()) {
extendedPublicKeys.put(keystore.getExtendedPublicKey(), keystore.getKeyDerivation());
//Shuffle outputs so change outputs are less obvious
transaction.shuffleOutputs();
if(includeGlobalXpubs) {
for(Keystore keystore : walletTransaction.getWallet().getKeystores()) {
extendedPublicKeys.put(keystore.getExtendedPublicKey(), keystore.getKeyDerivation());
}
}
if(version != null) {
this.version = version;
}
version = 0;
int inputIndex = 0;
for(Iterator<Map.Entry<BlockTransactionHashIndex, WalletNode>> iter = walletTransaction.getSelectedUtxos().entrySet().iterator(); iter.hasNext(); inputIndex++) {
@ -92,7 +109,7 @@ public class PSBT {
Map<ECKey, KeyDerivation> derivedPublicKeys = new LinkedHashMap<>();
for(Keystore keystore : wallet.getKeystores()) {
WalletNode walletNode = utxoEntry.getValue();
derivedPublicKeys.put(keystore.getPubKey(walletNode), keystore.getKeyDerivation());
derivedPublicKeys.put(keystore.getPubKey(walletNode), keystore.getKeyDerivation().extend(walletNode.getDerivation()));
}
PSBTInput psbtInput = new PSBTInput(wallet.getScriptType(), transaction, inputIndex, utxo, utxoIndex, redeemScript, witnessScript, derivedPublicKeys, Collections.emptyMap());
@ -100,8 +117,19 @@ public class PSBT {
}
List<WalletNode> outputNodes = new ArrayList<>();
outputNodes.add(wallet.getWalletAddresses().getOrDefault(walletTransaction.getRecipientAddress(), null));
outputNodes.add(walletTransaction.getChangeNode());
for(TransactionOutput txOutput : transaction.getOutputs()) {
try {
Address address = txOutput.getScript().getToAddresses()[0];
if(address.equals(walletTransaction.getRecipientAddress())) {
outputNodes.add(wallet.getWalletAddresses().getOrDefault(walletTransaction.getRecipientAddress(), null));
} else if(address.equals(wallet.getAddress(walletTransaction.getChangeNode()))) {
outputNodes.add(walletTransaction.getChangeNode());
}
} catch(NonStandardScriptException e) {
//Should never happen
throw new IllegalArgumentException(e);
}
}
for(int outputIndex = 0; outputIndex < outputNodes.size(); outputIndex++) {
WalletNode outputNode = outputNodes.get(outputIndex);
@ -109,7 +137,7 @@ public class PSBT {
PSBTOutput externalRecipientOutput = new PSBTOutput(null, null, Collections.emptyMap(), Collections.emptyMap());
psbtOutputs.add(externalRecipientOutput);
} else {
TransactionOutput txOutput = walletTransaction.getTransaction().getOutputs().get(outputIndex);
TransactionOutput txOutput = transaction.getOutputs().get(outputIndex);
//Construct dummy transaction to spend the UTXO created by this wallet's txOutput
Transaction transaction = new Transaction();
@ -127,7 +155,7 @@ public class PSBT {
Map<ECKey, KeyDerivation> derivedPublicKeys = new LinkedHashMap<>();
for(Keystore keystore : wallet.getKeystores()) {
derivedPublicKeys.put(keystore.getPubKey(outputNode), keystore.getKeyDerivation());
derivedPublicKeys.put(keystore.getPubKey(outputNode), keystore.getKeyDerivation().extend(outputNode.getDerivation()));
}
PSBTOutput walletOutput = new PSBTOutput(redeemScript, witnessScript, derivedPublicKeys, Collections.emptyMap());
@ -369,7 +397,7 @@ public class PSBT {
List<PSBTEntry> entries = new ArrayList<>();
if(transaction != null) {
entries.add(populateEntry(PSBT_GLOBAL_UNSIGNED_TX, null, transaction.bitcoinSerialize()));
entries.add(populateEntry(PSBT_GLOBAL_UNSIGNED_TX, null, transaction.bitcoinSerialize(false)));
}
for(Map.Entry<ExtendedKey, KeyDerivation> entry : extendedPublicKeys.entrySet()) {

2
src/main/java/com/sparrowwallet/drongo/psbt/PSBTInput.java
View file

@ -496,7 +496,7 @@ public class PSBTInput {
long prevValue = getWitnessUtxo().getValue();
hash = transaction.hashForWitnessSignature(index, connectedScript, prevValue, localSigHash);
} else {
hash = transaction.hashForSignature(index, connectedScript, localSigHash);
hash = transaction.hashForLegacySignature(index, connectedScript, localSigHash);
}
return hash;

14
src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
View file

@ -412,19 +412,27 @@ public class Wallet {
return getFee(changeOutput, feeRate, longTermFeeRate);
}
public WalletTransaction createWalletTransaction(List<UtxoSelector> utxoSelectors, Address recipientAddress, long recipientAmount, double feeRate, double longTermFeeRate, Long fee, boolean sendAll, boolean groupByAddress, boolean includeMempoolChange) throws InsufficientFundsException {
public WalletTransaction createWalletTransaction(List<UtxoSelector> utxoSelectors, Address recipientAddress, long recipientAmount, double feeRate, double longTermFeeRate, Long fee, Integer currentBlockHeight, boolean sendAll, boolean groupByAddress, boolean includeMempoolChange) throws InsufficientFundsException {
long valueRequiredAmt = recipientAmount;
while(true) {
Map<BlockTransactionHashIndex, WalletNode> selectedUtxos = selectInputs(utxoSelectors, valueRequiredAmt, feeRate, longTermFeeRate, groupByAddress, includeMempoolChange);
long totalSelectedAmt = selectedUtxos.keySet().stream().mapToLong(BlockTransactionHashIndex::getValue).sum();
//Add inputs
Transaction transaction = new Transaction();
transaction.setVersion(2);
if(currentBlockHeight != null) {
transaction.setLocktime(currentBlockHeight.longValue());
}
//Add inputs
for(Map.Entry<BlockTransactionHashIndex, WalletNode> selectedUtxo : selectedUtxos.entrySet()) {
Transaction prevTx = getTransactions().get(selectedUtxo.getKey().getHash()).getTransaction();
TransactionOutput prevTxOut = prevTx.getOutputs().get((int)selectedUtxo.getKey().getIndex());
addDummySpendingInput(transaction, selectedUtxo.getValue(), prevTxOut);
TransactionInput txInput = addDummySpendingInput(transaction, selectedUtxo.getValue(), prevTxOut);
//Enable opt-in RBF by default, matching Bitcoin Core and Electrum
txInput.setSequenceNumber(TransactionInput.SEQUENCE_RBF_ENABLED);
}
//Add recipient output