Add benchmark for signature verifies.

bench_test.go

@@ -5,6 +5,7 @@
 package btcec_test
 
 import (
+	"crypto/ecdsa"
 	"github.com/conformal/btcec"
 	"testing"
 )
@@ -29,3 +30,31 @@ func BenchmarkScalarMult(b *testing.B) {
 		curve.ScalarMult(x, y, k.Bytes())
 	}
 }
+
+// BenchmarkSigVerify benchmarks how long it takes the secp256k1 curve to
+// verify signatures.
+func BenchmarkSigVerify(b *testing.B) {
+	b.StopTimer()
+	// Randomly generated keypair.
+	// Private key: 9e0699c91ca1e3b7e3c9ba71eb71c89890872be97576010fe593fbf3fd57e66d
+	pubKey := ecdsa.PublicKey{
+		Curve: btcec.S256(),
+		X:     fromHex("d2e670a19c6d753d1a6d8b20bd045df8a08fb162cf508956c31268c6d81ffdab"),
+		Y:     fromHex("ab65528eefbb8057aa85d597258a3fbd481a24633bc9b47a9aa045c91371de52"),
+	}
+
+	// Double sha256 of []byte{0x01, 0x02, 0x03, 0x04}
+	msgHash := fromHex("8de472e2399610baaa7f84840547cd409434e31f5d3bd71e4d947f283874f9c0")
+	sigR := fromHex("fef45d2892953aa5bbcdb057b5e98b208f1617a7498af7eb765574e29b5d9c2c")
+	sigS := fromHex("d47563f52aac6b04b55de236b7c515eb9311757db01e02cff079c3ca6efb063f")
+
+	if !ecdsa.Verify(&pubKey, msgHash.Bytes(), sigR, sigS) {
+		b.Errorf("Signature failed to verify")
+		return
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		ecdsa.Verify(&pubKey, msgHash.Bytes(), sigR, sigS)
+	}
+}