global: begin modularization

device/noise_test.go

@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package device
+
+import (
+	"bytes"
+	"encoding/binary"
+	"testing"
+)
+
+func TestCurveWrappers(t *testing.T) {
+	sk1, err := newPrivateKey()
+	assertNil(t, err)
+
+	sk2, err := newPrivateKey()
+	assertNil(t, err)
+
+	pk1 := sk1.publicKey()
+	pk2 := sk2.publicKey()
+
+	ss1 := sk1.sharedSecret(pk2)
+	ss2 := sk2.sharedSecret(pk1)
+
+	if ss1 != ss2 {
+		t.Fatal("Failed to compute shared secet")
+	}
+}
+
+func TestNoiseHandshake(t *testing.T) {
+	dev1 := randDevice(t)
+	dev2 := randDevice(t)
+
+	defer dev1.Close()
+	defer dev2.Close()
+
+	peer1, _ := dev2.NewPeer(dev1.staticIdentity.privateKey.publicKey())
+	peer2, _ := dev1.NewPeer(dev2.staticIdentity.privateKey.publicKey())
+
+	assertEqual(
+		t,
+		peer1.handshake.precomputedStaticStatic[:],
+		peer2.handshake.precomputedStaticStatic[:],
+	)
+
+	/* simulate handshake */
+
+	// initiation message
+
+	t.Log("exchange initiation message")
+
+	msg1, err := dev1.CreateMessageInitiation(peer2)
+	assertNil(t, err)
+
+	packet := make([]byte, 0, 256)
+	writer := bytes.NewBuffer(packet)
+	err = binary.Write(writer, binary.LittleEndian, msg1)
+	assertNil(t, err)
+	peer := dev2.ConsumeMessageInitiation(msg1)
+	if peer == nil {
+		t.Fatal("handshake failed at initiation message")
+	}
+
+	assertEqual(
+		t,
+		peer1.handshake.chainKey[:],
+		peer2.handshake.chainKey[:],
+	)
+
+	assertEqual(
+		t,
+		peer1.handshake.hash[:],
+		peer2.handshake.hash[:],
+	)
+
+	// response message
+
+	t.Log("exchange response message")
+
+	msg2, err := dev2.CreateMessageResponse(peer1)
+	assertNil(t, err)
+
+	peer = dev1.ConsumeMessageResponse(msg2)
+	if peer == nil {
+		t.Fatal("handshake failed at response message")
+	}
+
+	assertEqual(
+		t,
+		peer1.handshake.chainKey[:],
+		peer2.handshake.chainKey[:],
+	)
+
+	assertEqual(
+		t,
+		peer1.handshake.hash[:],
+		peer2.handshake.hash[:],
+	)
+
+	// key pairs
+
+	t.Log("deriving keys")
+
+	err = peer1.BeginSymmetricSession()
+	if err != nil {
+		t.Fatal("failed to derive keypair for peer 1", err)
+	}
+
+	err = peer2.BeginSymmetricSession()
+	if err != nil {
+		t.Fatal("failed to derive keypair for peer 2", err)
+	}
+
+	key1 := peer1.keypairs.next
+	key2 := peer2.keypairs.current
+
+	// encrypting / decryption test
+
+	t.Log("test key pairs")
+
+	func() {
+		testMsg := []byte("wireguard test message 1")
+		var err error
+		var out []byte
+		var nonce [12]byte
+		out = key1.send.Seal(out, nonce[:], testMsg, nil)
+		out, err = key2.receive.Open(out[:0], nonce[:], out, nil)
+		assertNil(t, err)
+		assertEqual(t, out, testMsg)
+	}()
+
+	func() {
+		testMsg := []byte("wireguard test message 2")
+		var err error
+		var out []byte
+		var nonce [12]byte
+		out = key2.send.Seal(out, nonce[:], testMsg, nil)
+		out, err = key1.receive.Open(out[:0], nonce[:], out, nil)
+		assertNil(t, err)
+		assertEqual(t, out, testMsg)
+	}()
+}