mixing/utxoproof: Add benchmarks.

mixing/utxoproof/utxoproof_bench_test.go

@@ -0,0 +1,57 @@
+// Copyright (c) 2026 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package utxoproof
+
+import (
+	"testing"
+
+	"github.com/decred/dcrd/dcrec/secp256k1/v4"
+)
+
+// genSecp256k1KeyPair generates and returns a new secp256k1 key pair.
+func genSecp256k1KeyPair(b *testing.B) *Secp256k1KeyPair {
+	privKey, err := secp256k1.GeneratePrivateKey()
+	if err != nil {
+		b.Fatalf("failed to generate key pair: %v", err)
+	}
+	return &Secp256k1KeyPair{
+		Pub:  privKey.PubKey().SerializeCompressed(),
+		Priv: privKey,
+	}
+}
+
+// BenchmarkValidateSecp256k1P2PKH benchmarks how long it takes to sign a utxo
+// proof via [SignUtxoProof] along with the number of allocations needed.
+func BenchmarkSignUtxoProof(b *testing.B) {
+	const expires = 10
+	keyPair := genSecp256k1KeyPair(b)
+
+	b.ReportAllocs()
+	for b.Loop() {
+		_, err := keyPair.SignUtxoProof(expires)
+		if err != nil {
+			b.Fatalf("failed to sign utxo proof: %v", err)
+		}
+	}
+}
+
+// BenchmarkValidateSecp256k1P2PKH benchmarks how long it takes to validate a
+// secp256k1 p2pkh utxo proof via [ValidateSecp256k1P2PKH] along with the number
+// of allocations needed.
+func BenchmarkValidateSecp256k1P2PKH(b *testing.B) {
+	const expires = 10
+	keyPair := genSecp256k1KeyPair(b)
+	proof, err := keyPair.SignUtxoProof(expires)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ReportAllocs()
+	for b.Loop() {
+		if !ValidateSecp256k1P2PKH(keyPair.Pub, proof, expires) {
+			b.Fatal("failed to validate utxo proof")
+		}
+	}
+}