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// Package speed implements the "-speed" command-line option,
// similar to "openssl speed".
// It benchmarks the crypto algorithms and libraries used by
// gocryptfs.
package speed
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"fmt"
"log"
"testing"
"golang.org/x/crypto/chacha20poly1305"
"github.com/rfjakob/gocryptfs/v2/internal/cryptocore"
"github.com/rfjakob/gocryptfs/v2/internal/siv_aead"
"github.com/rfjakob/gocryptfs/v2/internal/stupidgcm"
)
// 128-bit file ID + 64 bit block number = 192 bits = 24 bytes
const adLen = 24
// gocryptfs uses fixed-size 4 kiB blocks
const blockSize = 4096
// Run - run the speed the test and print the results.
func Run() {
bTable := []struct {
name string
f func(*testing.B)
preferred bool
}{
{name: cryptocore.BackendOpenSSL.Name, f: bStupidGCM, preferred: stupidgcm.PreferOpenSSL()},
{name: cryptocore.BackendGoGCM.Name, f: bGoGCM, preferred: !stupidgcm.PreferOpenSSL()},
{name: cryptocore.BackendAESSIV.Name, f: bAESSIV, preferred: false},
{name: cryptocore.BackendXChaCha20Poly1305.Name, f: bXchacha20poly1305, preferred: false},
{name: cryptocore.BackendXChaCha20Poly1305OpenSSL.Name, f: bStupidXchacha, preferred: false},
}
for _, b := range bTable {
fmt.Printf("%-26s\t", b.name)
mbs := mbPerSec(testing.Benchmark(b.f))
if mbs > 0 {
fmt.Printf("%7.2f MB/s", mbs)
} else {
fmt.Printf(" N/A")
}
if b.preferred {
fmt.Printf("\t(selected in auto mode)\n")
} else if b.name == cryptocore.BackendXChaCha20Poly1305.Name {
fmt.Printf("\t(use via -xchacha flag)\n")
} else {
fmt.Printf("\t\n")
}
}
}
func mbPerSec(r testing.BenchmarkResult) float64 {
if r.Bytes <= 0 || r.T <= 0 || r.N <= 0 {
return 0
}
return (float64(r.Bytes) * float64(r.N) / 1e6) / r.T.Seconds()
}
// Get "n" random bytes from /dev/urandom or panic
func randBytes(n int) []byte {
b := make([]byte, n)
_, err := rand.Read(b)
if err != nil {
log.Panic("Failed to read random bytes: " + err.Error())
}
return b
}
// bEncrypt benchmarks the encryption speed of cipher "c"
func bEncrypt(b *testing.B, c cipher.AEAD) {
authData := randBytes(adLen)
iv := randBytes(c.NonceSize())
in := make([]byte, blockSize)
dst := make([]byte, len(in)+len(iv)+c.Overhead())
copy(dst, iv)
b.SetBytes(int64(len(in)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
// Reset dst buffer
dst = dst[:len(iv)]
// Encrypt and append to nonce
c.Seal(dst, iv, in, authData)
}
}
// bStupidGCM benchmarks stupidgcm's openssl GCM
func bStupidGCM(b *testing.B) {
if stupidgcm.BuiltWithoutOpenssl {
b.Skip("openssl has been disabled at compile-time")
}
bEncrypt(b, stupidgcm.New(randBytes(32), false))
}
// bGoGCM benchmarks Go stdlib GCM
func bGoGCM(b *testing.B) {
gAES, err := aes.NewCipher(randBytes(32))
if err != nil {
b.Fatal(err)
}
gGCM, err := cipher.NewGCMWithNonceSize(gAES, 16)
if err != nil {
b.Fatal(err)
}
bEncrypt(b, gGCM)
}
// bAESSIV benchmarks AES-SIV from github.com/jacobsa/crypto/siv
func bAESSIV(b *testing.B) {
c := siv_aead.New(randBytes(64))
bEncrypt(b, c)
}
// bXchacha20poly1305 benchmarks XChaCha20 from golang.org/x/crypto/chacha20poly1305
func bXchacha20poly1305(b *testing.B) {
c, _ := chacha20poly1305.NewX(randBytes(32))
bEncrypt(b, c)
}
// bStupidXchacha benchmarks OpenSSL XChaCha20
func bStupidXchacha(b *testing.B) {
if stupidgcm.BuiltWithoutOpenssl {
b.Skip("openssl has been disabled at compile-time")
}
bEncrypt(b, stupidgcm.NewXchacha20poly1305(randBytes(32)))
}
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