Add first compatibility test

compat/compat_test.go

@@ -0,0 +1,40 @@
+package compat
+
+import (
+	"bytes"
+	"crypto/rand"
+	"testing"
+
+	sbox "github.com/stouset/go.noise/box"
+	scipher "github.com/stouset/go.noise/ciphersuite"
+	"github.com/titanous/noise/box"
+)
+
+var plaintext = []byte("yellow submarine")
+
+func TestStousetSendBox(t *testing.T) {
+	senderKey := scipher.Noise255.NewKeypair()
+	receiverKey, _ := box.Noise255.GenerateKey(rand.Reader)
+
+	sc := sbox.NewContext(scipher.Noise255, senderKey, 0)
+	sc.Init(scipher.PublicKey(receiverKey.Public))
+
+	ciphertext := sc.Shut(plaintext, 0, 5)
+
+	dc := &box.Crypter{
+		Cipher:  box.Noise255,
+		Key:     receiverKey,
+		PeerKey: box.Key{Public: []byte(senderKey.Public)},
+	}
+	if expected := dc.BoxLen(len(plaintext) + 5); len(ciphertext) != expected {
+		t.Errorf("expected box length to be %d, got %d", expected, len(ciphertext))
+	}
+
+	result, err := dc.DecryptBox(ciphertext, 0)
+	if err != nil {
+		t.Error("error decrypting:", err)
+	}
+	if !bytes.Equal(plaintext, result) {
+		t.Errorf("expected %q, got %q", plaintext, result)
+	}
+}