multi: use prev output fetcher everywhere

cmd/chantools/closepoolaccount.go

@@ -241,8 +241,11 @@ func closePoolAccount(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 	// Calculate the fee based on the given fee rate and our weight
 	// estimation.
 	var (
-		estimator input.TxWeightEstimator
+		estimator      input.TxWeightEstimator
-		signDesc  = &input.SignDescriptor{
+		prevOutFetcher = txscript.NewCannedPrevOutputFetcher(
+			pkScript, sweepValue,
+		)
+		signDesc = &input.SignDescriptor{
 			KeyDesc: keychain.KeyDescriptor{
 				KeyLocator: keychain.KeyLocator{
 					Family: poolscript.AccountKeyFamily,
@@ -255,10 +258,8 @@ func closePoolAccount(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 				PkScript: pkScript,
 				Value:    sweepValue,
 			},
-			InputIndex: 0,
+			InputIndex:        0,
-			PrevOutputFetcher: txscript.NewCannedPrevOutputFetcher(
+			PrevOutputFetcher: prevOutFetcher,
-				pkScript, sweepValue,
-			),
 		}
 	)
 
@@ -267,7 +268,9 @@ func closePoolAccount(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 		estimator.AddWitnessInput(poolscript.ExpiryWitnessSize)
 		signDesc.HashType = txscript.SigHashAll
 		signDesc.SignMethod = input.WitnessV0SignMethod
-		signDesc.SigHashes = input.NewTxSigHashesV0Only(sweepTx)
+		signDesc.SigHashes = txscript.NewTxSigHashes(
+			sweepTx, prevOutFetcher,
+		)
 
 	case account.VersionTaprootEnabled:
 		estimator.AddWitnessInput(poolscript.TaprootExpiryWitnessSize)

cmd/chantools/recoverloopin.go

@@ -258,8 +258,12 @@ func getSignedTx(signer *lnd.Signer, loopIn *loopdb.LoopIn, sweepTx *wire.MsgTx,
 	keyIndex uint32) ([]byte, error) {
 
 	// Create the sign descriptor.
-	prevoutFetcher := txscript.NewCannedPrevOutputFetcher(
+	prevTxOut := &wire.TxOut{
-		htlc.PkScript, int64(loopIn.Contract.AmountRequested),
+		PkScript: htlc.PkScript,
+		Value:    int64(loopIn.Contract.AmountRequested),
+	}
+	prevOutputFetcher := txscript.NewCannedPrevOutputFetcher(
+		prevTxOut.PkScript, prevTxOut.Value,
 	)
 
 	signDesc := &input.SignDescriptor{
@@ -272,11 +276,8 @@ func getSignedTx(signer *lnd.Signer, loopIn *loopdb.LoopIn, sweepTx *wire.MsgTx,
 		WitnessScript:     htlc.TimeoutScript(),
 		HashType:          htlc.SigHash(),
 		InputIndex:        0,
-		PrevOutputFetcher: prevoutFetcher,
+		PrevOutputFetcher: prevOutputFetcher,
-		Output: &wire.TxOut{
+		Output:            prevTxOut,
-			PkScript: htlc.PkScript,
-			Value:    int64(loopIn.Contract.AmountRequested),
-		},
 	}
 	switch htlc.Version {
 	case swap.HtlcV2:
@@ -303,13 +304,13 @@ func getSignedTx(signer *lnd.Signer, loopIn *loopdb.LoopIn, sweepTx *wire.MsgTx,
 		return nil, err
 	}
 
-	sighashes := txscript.NewTxSigHashes(sweepTx, prevoutFetcher)
+	sigHashes := txscript.NewTxSigHashes(sweepTx, prevOutputFetcher)
 
 	// Verify the signature. This will throw an error if the signature is
 	// invalid and allows us to bruteforce the key index.
 	vm, err := txscript.NewEngine(
-		htlc.PkScript, sweepTx, 0, txscript.StandardVerifyFlags, nil,
+		prevTxOut.PkScript, sweepTx, 0, txscript.StandardVerifyFlags,
-		sighashes, int64(loopIn.Contract.AmountRequested), prevoutFetcher,
+		nil, sigHashes, prevTxOut.Value, prevOutputFetcher,
 	)
 	if err != nil {
 		return nil, err

cmd/chantools/sweepremoteclosed.go

@@ -173,6 +173,7 @@ func sweepRemoteClosed(extendedKey *hdkeychain.ExtendedKey, apiURL,
 		signDescs        []*input.SignDescriptor
 		sweepTx          = wire.NewMsgTx(2)
 		totalOutputValue = uint64(0)
+		prevOutFetcher   = txscript.NewMultiPrevOutFetcher(nil)
 	)
 
 	// Add all found target outputs.
@@ -207,22 +208,25 @@ func sweepRemoteClosed(extendedKey *hdkeychain.ExtendedKey, apiURL,
 				sequence = 1
 			}
 
+			prevOutPoint := wire.OutPoint{
+				Hash:  *txHash,
+				Index: uint32(vout.Outspend.Vin),
+			}
+			prevTxOut := &wire.TxOut{
+				PkScript: pkScript,
+				Value:    int64(vout.Value),
+			}
+			prevOutFetcher.AddPrevOut(prevOutPoint, prevTxOut)
 			sweepTx.TxIn = append(sweepTx.TxIn, &wire.TxIn{
-				PreviousOutPoint: wire.OutPoint{
+				PreviousOutPoint: prevOutPoint,
-					Hash:  *txHash,
+				Sequence:         sequence,
-					Index: uint32(vout.Outspend.Vin),
-				},
-				Sequence: sequence,
 			})
 
 			signDescs = append(signDescs, &input.SignDescriptor{
 				KeyDesc:       *target.keyDesc,
 				WitnessScript: target.script,
-				Output: &wire.TxOut{
+				Output:        prevTxOut,
-					PkScript: pkScript,
+				HashType:      txscript.SigHashAll,
-					Value:    int64(vout.Value),
-				},
-				HashType: txscript.SigHashAll,
 			})
 		}
 	}
@@ -259,7 +263,7 @@ func sweepRemoteClosed(extendedKey *hdkeychain.ExtendedKey, apiURL,
 			ExtendedKey: extendedKey,
 			ChainParams: chainParams,
 		}
-		sigHashes = input.NewTxSigHashesV0Only(sweepTx)
+		sigHashes = txscript.NewTxSigHashes(sweepTx, prevOutFetcher)
 	)
 	for idx, desc := range signDescs {
 		desc.SigHashes = sigHashes

cmd/chantools/sweeptimelock.go

@@ -222,11 +222,13 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 	}
 	api := &btc.ExplorerAPI{BaseURL: apiURL}
 
-	sweepTx := wire.NewMsgTx(2)
+	var (
-	totalOutputValue := int64(0)
+		sweepTx          = wire.NewMsgTx(2)
-	signDescs := make([]*input.SignDescriptor, 0)
+		totalOutputValue = int64(0)
-	var estimator input.TxWeightEstimator
+		signDescs        = make([]*input.SignDescriptor, 0)
-
+		prevOutFetcher   = txscript.NewMultiPrevOutFetcher(nil)
+		estimator        input.TxWeightEstimator
+	)
 	for _, target := range targets {
 		// We can't rely on the CSV delay of the channel DB to be
 		// correct. But it doesn't cost us a lot to just brute force it.
@@ -246,11 +248,17 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 		}
 
 		// Create the transaction input.
+		prevOutPoint := wire.OutPoint{
+			Hash:  target.txid,
+			Index: target.index,
+		}
+		prevTxOut := &wire.TxOut{
+			PkScript: scriptHash,
+			Value:    target.value,
+		}
+		prevOutFetcher.AddPrevOut(prevOutPoint, prevTxOut)
 		sweepTx.TxIn = append(sweepTx.TxIn, &wire.TxIn{
-			PreviousOutPoint: wire.OutPoint{
+			PreviousOutPoint: prevOutPoint,
-				Hash:  target.txid,
-				Index: target.index,
-			},
 			Sequence: input.LockTimeToSequence(
 				false, uint32(csvTimeout),
 			),
@@ -264,11 +272,8 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 				target.delayBasePointDesc.PubKey,
 			),
 			WitnessScript: script,
-			Output: &wire.TxOut{
+			Output:        prevTxOut,
-				PkScript: scriptHash,
+			HashType:      txscript.SigHashAll,
-				Value:    target.value,
-			},
-			HashType: txscript.SigHashAll,
 		}
 		totalOutputValue += target.value
 		signDescs = append(signDescs, signDesc)
@@ -298,7 +303,7 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 	}}
 
 	// Sign the transaction now.
-	sigHashes := input.NewTxSigHashesV0Only(sweepTx)
+	sigHashes := txscript.NewTxSigHashes(sweepTx, prevOutFetcher)
 	for idx, desc := range signDescs {
 		desc.SigHashes = sigHashes
 		desc.InputIndex = idx

cmd/chantools/sweeptimelockmanual.go

@@ -257,7 +257,10 @@ func sweepTimeLockManual(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 		totalFee, sweepValue, estimator.Weight())
 
 	// Create the sign descriptor for the input then sign the transaction.
-	sigHashes := input.NewTxSigHashesV0Only(sweepTx)
+	prevOutFetcher := txscript.NewCannedPrevOutputFetcher(
+		scriptHash, sweepValue,
+	)
+	sigHashes := txscript.NewTxSigHashes(sweepTx, prevOutFetcher)
 	signDesc := &input.SignDescriptor{
 		KeyDesc: *delayDesc,
 		SingleTweak: input.SingleTweakBytes(

lnd/channel.go

@@ -67,7 +67,6 @@ func (lc *LightningChannel) SignedCommitTx() (*wire.MsgTx, error) {
 
 	// With this, we then generate the full witness so the caller can
 	// broadcast a fully signed transaction.
-	lc.SignDesc.SigHashes = input.NewTxSigHashesV0Only(commitTx)
 	ourSig, err := lc.TXSigner.SignOutputRaw(commitTx, lc.SignDesc)
 	if err != nil {
 		return nil, err

lnd/signer.go

@@ -12,6 +12,7 @@ import (
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcwallet/wallet"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/keychain"
 )
@@ -132,13 +133,16 @@ func (s *Signer) AddPartialSignature(packet *psbt.Packet,
 	inputIndex int) error {
 
 	// Now we add our partial signature.
+	prevOutFetcher := wallet.PsbtPrevOutputFetcher(packet)
 	signDesc := &input.SignDescriptor{
 		KeyDesc:       keyDesc,
 		WitnessScript: witnessScript,
 		Output:        utxo,
 		InputIndex:    inputIndex,
 		HashType:      txscript.SigHashAll,
-		SigHashes:     input.NewTxSigHashesV0Only(packet.UnsignedTx),
+		SigHashes: txscript.NewTxSigHashes(
+			packet.UnsignedTx, prevOutFetcher,
+		),
 	}
 	ourSigRaw, err := s.SignOutputRaw(packet.UnsignedTx, signDesc)
 	if err != nil {