From 3e27acb989614f82a25d50ab19a0a4419f19aa27 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Fri, 3 Sep 2021 18:30:42 +0200
Subject: speed: add decryption benchmarks

gocryptfs/internal/speed$ go test -bench .
goos: linux
goarch: amd64
pkg: github.com/rfjakob/gocryptfs/v2/internal/speed
cpu: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
BenchmarkStupidGCM-4              	  263742	      4523 ns/op	 905.61 MB/s
BenchmarkStupidGCMDecrypt-4       	  204858	      5779 ns/op	 708.76 MB/s
BenchmarkGoGCM-4                  	  291259	      4095 ns/op	1000.25 MB/s
BenchmarkGoGCMDecrypt-4           	  293886	      4061 ns/op	1008.53 MB/s
BenchmarkAESSIV-4                 	   46537	     25538 ns/op	 160.39 MB/s
BenchmarkAESSIVDecrypt-4          	   46770	     25627 ns/op	 159.83 MB/s
BenchmarkXchacha-4                	  243619	      4893 ns/op	 837.03 MB/s
BenchmarkXchachaDecrypt-4         	  248857	      4793 ns/op	 854.51 MB/s
BenchmarkStupidXchacha-4          	  213717	      5558 ns/op	 736.99 MB/s
BenchmarkStupidXchachaDecrypt-4   	  176635	      6782 ns/op	 603.96 MB/s
PASS
ok  	github.com/rfjakob/gocryptfs/v2/internal/speed	12.871s
---
 internal/speed/speed.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'internal/speed/speed.go')

diff --git a/internal/speed/speed.go b/internal/speed/speed.go
index 37b9daf..a696703 100644
--- a/internal/speed/speed.go
+++ b/internal/speed/speed.go
@@ -92,6 +92,25 @@ func bEncrypt(b *testing.B, c cipher.AEAD) {
 
 }
 
+func bDecrypt(b *testing.B, c cipher.AEAD) {
+	authData := randBytes(adLen)
+	iv := randBytes(c.NonceSize())
+	plain := randBytes(blockSize)
+	ciphertext := c.Seal(iv, iv, plain, authData)
+
+	b.SetBytes(int64(len(plain)))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// Reset plain buffer
+		plain = plain[:0]
+		// Decrypt
+		_, err := c.Open(plain, iv, ciphertext[c.NonceSize():], authData)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
 // bStupidGCM benchmarks stupidgcm's openssl GCM
 func bStupidGCM(b *testing.B) {
 	if stupidgcm.BuiltWithoutOpenssl {
-- 
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