add rsa benchmark

cng/rsa_test.go

@@ -9,6 +9,7 @@ package cng
 import (
 	"bytes"
 	"crypto"
+	"math/big"
 	"strconv"
 	"testing"
 )
@@ -163,3 +164,28 @@ func TestSignVerifyRSAPSS(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func fromBase36(base36 string) *big.Int {
+	i, ok := new(big.Int).SetString(base36, 36)
+	if !ok {
+		panic("bad number: " + base36)
+	}
+	return i
+}
+
+func BenchmarkEncryptRSAPKCS1(b *testing.B) {
+	b.StopTimer()
+	// Public key length should be at least of 2048 bits, else OpenSSL will report an error when running in FIPS mode.
+	n := fromBase36("14314132931241006650998084889274020608918049032671858325988396851334124245188214251956198731333464217832226406088020736932173064754214329009979944037640912127943488972644697423190955557435910767690712778463524983667852819010259499695177313115447116110358524558307947613422897787329221478860907963827160223559690523660574329011927531289655711860504630573766609239332569210831325633840174683944553667352219670930408593321661375473885147973879086994006440025257225431977751512374815915392249179976902953721486040787792801849818254465486633791826766873076617116727073077821584676715609985777563958286637185868165868520557")
+	test2048PubKey, err := NewPublicKeyRSA(n, big.NewInt(3))
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		if _, err := EncryptRSAPKCS1(test2048PubKey, []byte("testing")); err != nil {
+			b.Fatal(err)
+		}
+	}
+}