tests: add encryption benchmarks to cryptfs

2 files changed, 79 insertions, 0 deletions

diff --git a/cryptfs/openssl_benchmark.bash b/cryptfs/openssl_benchmark.bash
new file mode 100755
index 0000000..df29628
--- /dev/null
+++ b/cryptfs/openssl_benchmark.bash
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+go test -run NONE -bench BenchmarkEnc
diff --git a/cryptfs/openssl_test.go b/cryptfs/openssl_test.go
new file mode 100644
index 0000000..85a97d9
--- /dev/null
+++ b/cryptfs/openssl_test.go
@@ -0,0 +1,76 @@
+package cryptfs
+
+// Benchmark go built-int GCM against spacemonkey openssl bindings
+//
+// Note: The benchmarks in this file supersede the ones in the openssl_benchmark
+//       directory as they use the same code paths that gocryptfs actually uses.
+//
+// Run benchmark:
+// go test -bench Enc
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"testing"
+)
+
+func benchmarkGoEnc(b *testing.B, plaintext []byte, key []byte, nonce []byte) (ciphertext []byte) {
+	b.SetBytes(int64(len(plaintext)))
+	aes, err := aes.NewCipher(key[:])
+	if err != nil {
+		b.Fatal(err)
+	}
+	aesgcm, err := cipher.NewGCMWithNonceSize(aes, len(nonce))
+	if err != nil {
+		b.Fatal(err)
+	}
+	// This would be fileID + blockNo
+	aData := make([]byte, 24)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// Encrypt plaintext and append to nonce
+		ciphertext = aesgcm.Seal(nonce, nonce, plaintext, aData)
+	}
+	return ciphertext
+}
+
+func benchmarkOpensslEnc(b *testing.B, plaintext []byte, key []byte, nonce []byte) (ciphertext []byte) {
+	b.SetBytes(int64(len(plaintext)))
+	var aesgcm opensslGCM
+	aesgcm.key = key
+	// This would be fileID + blockNo
+	aData := make([]byte, 24)
+	for i := 0; i < b.N; i++ {
+		// Encrypt plaintext and append to nonce
+		ciphertext = aesgcm.Seal(nonce, nonce, plaintext, aData)
+	}
+	return ciphertext
+}
+
+func BenchmarkEnc_Go_4k_AES256_nonce96(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkGoEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_Go_4k_AES256_nonce128(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 128/8)
+	benchmarkGoEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_OpenSSL_4k_AES256_nonce96(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkOpensslEnc(b, plaintext, key, nonce)
+}
+
+func BenchmarkEnc_OpenSSL_4k_AES256_nonce128(b *testing.B) {
+	plaintext := make([]byte, 4048)
+	key := make([]byte, 256/8)
+	nonce := make([]byte, 96/8)
+	benchmarkOpensslEnc(b, plaintext, key, nonce)
+}