From 99d303ac2739e65a02fbbc325b74ad6fcac63cc2 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 5 Jun 2015 15:58:00 +0200
Subject: Initial commit

---
 contrib/external-tests/go/main.go | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 contrib/external-tests/go/main.go

(limited to 'contrib/external-tests/go')

diff --git a/contrib/external-tests/go/main.go b/contrib/external-tests/go/main.go
new file mode 100644
index 0000000..de7337b
--- /dev/null
+++ b/contrib/external-tests/go/main.go
@@ -0,0 +1,63 @@
+/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
+
+package main
+
+import (
+	"github.com/titanous/noise"
+	"net"
+	"time"
+	"bytes"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/binary"
+	"github.com/dchest/blake2s"
+)
+
+func assert(exp bool) {
+	if !exp {
+		panic("Assertion failed.")
+	}
+}
+
+func main() {
+	my_private, _ := base64.StdEncoding.DecodeString("WAmgVYXkbT2bCtdcDwolI88/iVi/aV3/PHcUBTQSYmo=")
+	my_public, _ := base64.StdEncoding.DecodeString("K5sF9yESrSBsOXPd6TcpKNgqoy1Ik3ZFKl4FolzrRyI=")
+	preshared, _ := base64.StdEncoding.DecodeString("FpCyhws9cxwWoV4xELtfJvjJN+zQVRPISllRWgeopVE=")
+	their_public, _ := base64.StdEncoding.DecodeString("qRCwZSKInrMAq5sepfCdaCsRJaoLe5jhtzfiw7CjbwM=")
+	cs := noise.NewCipherSuite(noise.DH25519, noise.CipherChaChaPoly, noise.HashBLAKE2s)
+	hs := noise.NewHandshakeState(noise.Config{CipherSuite: cs, Random: rand.Reader, Pattern: noise.HandshakeIK, Initiator: true, Prologue: []byte("WireGuard v0 zx2c4 Jason@zx2c4.com"), PresharedKey: preshared, StaticKeypair: noise.DHKey{Private: my_private, Public: my_public}, PeerStatic: their_public})
+	conn, _ := net.Dial("udp", "test.wireguard.io:51820")
+
+	now := time.Now()
+	tai64n := make([]byte, 12)
+	binary.BigEndian.PutUint64(tai64n[:], uint64(now.Unix()))
+	binary.BigEndian.PutUint32(tai64n[8:], uint32(now.UnixNano()))
+	initiation_packet := make([]byte, 5)
+	initiation_packet[0] = 1 /* Type: Initiation */
+	binary.LittleEndian.PutUint32(initiation_packet[1:], 28) /* Sender index: 28 (arbitrary) */
+	initiation_packet, _, _ = hs.WriteMessage(initiation_packet, tai64n)
+	hasher, _ := blake2s.New(&blake2s.Config{Size: 16, Key: preshared})
+	hasher.Write(their_public)
+	hasher.Write(initiation_packet)
+	initiation_packet = append(initiation_packet, hasher.Sum(nil)[:16]...)
+	initiation_packet = append(initiation_packet, bytes.Repeat([]byte{ 0 }, 16)...)
+	conn.Write(initiation_packet)
+
+	response_packet := make([]byte, 89)
+	conn.Read(response_packet)
+	assert(response_packet[0] == 2 /* Type: Response */)
+	their_index := binary.LittleEndian.Uint32(response_packet[1:])
+	our_index := binary.LittleEndian.Uint32(response_packet[5:])
+	assert(our_index == 28)
+	payload, send_cs, _, err := hs.ReadMessage(nil, response_packet[9:57])
+	assert(len(payload) == 0 && err == nil)
+
+	keepalive_packet := make([]byte, 13)
+	keepalive_packet[0] = 4 /* Type: Data */
+	binary.LittleEndian.PutUint32(keepalive_packet[1:], their_index)
+	binary.LittleEndian.PutUint64(keepalive_packet[3:], 0) /* Nonce */
+	keepalive_packet = send_cs.Encrypt(keepalive_packet, nil, nil)
+	conn.Write(keepalive_packet)
+
+	conn.Close()
+}
-- 
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