btcec/signature.go

@@ -353,6 +353,10 @@ func recoverKeyFromSignature(curve *KoblitzCurve, sig *Signature, msg []byte,
 	// step to prevent the jacobian conversion back and forth.
 	Qx, Qy := curve.Add(sRx, sRy, minuseGx, minuseGy)
 
+	if Qx.Sign() == 0 && Qy.Sign() == 0 {
+		return nil, errors.New("point (Qx, Qy) equals the point at infinity")
+	}
+
 	return &PublicKey{
 		Curve: curve,
 		X:     Qx,

mempool/mempool_test.go

@@ -560,7 +560,7 @@ func TestOrphanReject(t *testing.T) {
 
 		// Ensure no transactions were reported as accepted.
 		if len(acceptedTxns) != 0 {
-			t.Fatal("ProcessTransaction: reported %d accepted "+
+			t.Fatalf("ProcessTransaction: reported %d accepted "+
 				"transactions from failed orphan attempt",
 				len(acceptedTxns))
 		}

mempool/policy.go

@@ -172,17 +172,10 @@ func checkPkScriptStandard(pkScript []byte, scriptClass txscript.ScriptClass) er
 	return nil
 }
 
-// isDust returns whether or not the passed transaction output amount is
-// considered dust or not based on the passed minimum transaction relay fee.
-// Dust is defined in terms of the minimum transaction relay fee.  In
-// particular, if the cost to the network to spend coins is more than 1/3 of the
-// minimum transaction relay fee, it is considered dust.
-func isDust(txOut *wire.TxOut, minRelayTxFee btcutil.Amount) bool {
-	// Unspendable outputs are considered dust.
-	if txscript.IsUnspendable(txOut.PkScript) {
-		return true
-	}
-
+// GetDustThreshold calculates the dust limit for a *wire.TxOut by taking the
+// size of a typical spending transaction and multiplying it by 3 to account
+// for the minimum dust relay fee of 3000sat/kvb.
+func GetDustThreshold(txOut *wire.TxOut) int64 {
 	// The total serialized size consists of the output and the associated
 	// input script to redeem it.  Since there is no input script
 	// to redeem it yet, use the minimum size of a typical input script.
@@ -253,6 +246,20 @@ func isDust(txOut *wire.TxOut, minRelayTxFee btcutil.Amount) bool {
 		totalSize += 107
 	}
 
+	return 3 * int64(totalSize)
+}
+
+// IsDust returns whether or not the passed transaction output amount is
+// considered dust or not based on the passed minimum transaction relay fee.
+// Dust is defined in terms of the minimum transaction relay fee.  In
+// particular, if the cost to the network to spend coins is more than 1/3 of the
+// minimum transaction relay fee, it is considered dust.
+func IsDust(txOut *wire.TxOut, minRelayTxFee btcutil.Amount) bool {
+	// Unspendable outputs are considered dust.
+	if txscript.IsUnspendable(txOut.PkScript) {
+		return true
+	}
+
 	// The output is considered dust if the cost to the network to spend the
 	// coins is more than 1/3 of the minimum free transaction relay fee.
 	// minFreeTxRelayFee is in Satoshi/KB, so multiply by 1000 to
@@ -265,7 +272,7 @@ func isDust(txOut *wire.TxOut, minRelayTxFee btcutil.Amount) bool {
 	//
 	// The following is equivalent to (value/totalSize) * (1/3) * 1000
 	// without needing to do floating point math.
-	return txOut.Value*1000/(3*int64(totalSize)) < int64(minRelayTxFee)
+	return txOut.Value*1000/GetDustThreshold(txOut) < int64(minRelayTxFee)
 }
 
 // checkTransactionStandard performs a series of checks on a transaction to
@@ -351,7 +358,7 @@ func checkTransactionStandard(tx *btcutil.Tx, height int32,
 		// "dust".
 		if scriptClass == txscript.NullDataTy {
 			numNullDataOutputs++
-		} else if isDust(txOut, minRelayTxFee) {
+		} else if IsDust(txOut, minRelayTxFee) {
 			str := fmt.Sprintf("transaction output %d: payment "+
 				"of %d is dust", i, txOut.Value)
 			return txRuleError(wire.RejectDust, str)

mempool/policy_test.go

@@ -204,7 +204,7 @@ func TestCheckPkScriptStandard(t *testing.T) {
 	}
 }
 
-// TestDust tests the isDust API.
+// TestDust tests the IsDust API.
 func TestDust(t *testing.T) {
 	pkScript := []byte{0x76, 0xa9, 0x21, 0x03, 0x2f, 0x7e, 0x43,
 		0x0a, 0xa4, 0xc9, 0xd1, 0x59, 0x43, 0x7e, 0x84, 0xb9,
@@ -268,7 +268,7 @@ func TestDust(t *testing.T) {
 		},
 	}
 	for _, test := range tests {
-		res := isDust(&test.txOut, test.relayFee)
+		res := IsDust(&test.txOut, test.relayFee)
 		if res != test.isDust {
 			t.Fatalf("Dust test '%s' failed: want %v got %v",
 				test.name, test.isDust, res)

version.go

@@ -18,7 +18,7 @@ const semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqr
 const (
 	appMajor uint = 0
 	appMinor uint = 22
-	appPatch uint = 1
+	appPatch uint = 2
 
 	// appPreRelease MUST only contain characters from semanticAlphabet
 	// per the semantic versioning spec.

wire/msgtx.go

@@ -103,27 +103,28 @@ const (
 	maxWitnessItemsPerInput = 500000
 
 	// maxWitnessItemSize is the maximum allowed size for an item within
-	// an input's witness data. This number is derived from the fact that
-	// for script validation, each pushed item onto the stack must be less
-	// than 10k bytes.
-	maxWitnessItemSize = 11000
+	// an input's witness data. This value is bounded by the largest
+	// possible block size, post segwit v1 (taproot).
+	maxWitnessItemSize = 4_000_000
 )
 
 // TxFlagMarker is the first byte of the FLAG field in a bitcoin tx
 // message. It allows decoders to distinguish a regular serialized
 // transaction from one that would require a different parsing logic.
 //
 // Position of FLAG in a bitcoin tx message:
-//   ┌─────────┬────────────────────┬─────────────┬─────┐
-//   │ VERSION │ FLAG               │ TX-IN-COUNT │ ... │
-//   │ 4 bytes │ 2 bytes (optional) │ varint      │     │
-//   └─────────┴────────────────────┴─────────────┴─────┘
+//
+//	┌─────────┬────────────────────┬─────────────┬─────┐
+//	│ VERSION │ FLAG               │ TX-IN-COUNT │ ... │
+//	│ 4 bytes │ 2 bytes (optional) │ varint      │     │
+//	└─────────┴────────────────────┴─────────────┴─────┘
 //
 // Zooming into the FLAG field:
-//   ┌── FLAG ─────────────┬────────┐
-//   │ TxFlagMarker (0x00) │ TxFlag │
-//   │ 1 byte              │ 1 byte │
-//   └─────────────────────┴────────┘
+//
+//	┌── FLAG ─────────────┬────────┐
+//	│ TxFlagMarker (0x00) │ TxFlag │
+//	│ 1 byte              │ 1 byte │
+//	└─────────────────────┴────────┘
 const TxFlagMarker = 0x00
 
 // TxFlag is the second byte of the FLAG field in a bitcoin tx message.
@@ -586,8 +587,9 @@ func (msg *MsgTx) BtcDecode(r io.Reader, pver uint32, enc MessageEncoding) error
 			// item itself.
 			txin.Witness = make([][]byte, witCount)
 			for j := uint64(0); j < witCount; j++ {
-				txin.Witness[j], err = readScript(r, pver,
-					maxWitnessItemSize, "script witness item")
+				txin.Witness[j], err = readScript(
+					r, pver, maxWitnessItemSize, "script witness item",
+				)
 				if err != nil {
 					returnScriptBuffers()
 					return err