wireguard-go key dumping patch

0001-key-dumping.patch

From 4181bdea33c11bc0209f1951315107cf0fcff11a Mon Sep 17 00:00:00 2001
From: edef <edef@edef.eu>
Date: Sun, 10 Apr 2022 17:19:29 +0000
Subject: [PATCH] key dumping

Same output format as extract-keys.sh

Signed-off-by: edef <edef@edef.eu>
---
 device/noise-protocol.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/device/noise-protocol.go b/device/noise-protocol.go
index ffa0452..3a0437f 100644
--- a/device/noise-protocol.go
+++ b/device/noise-protocol.go
@@ -6,6 +6,7 @@
 package device
 
 import (
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"sync"
@@ -132,6 +133,18 @@ type Handshake struct {
 	lastSentHandshake         time.Time
 }
 
+func (device *Device) dumpKeys(handshake *Handshake) {
+	fmt.Println("New handshake session:")
+	for k, v := range map[string][]byte{
+		"LOCAL_STATIC_PRIVATE_KEY":    device.staticIdentity.privateKey[:],
+		"REMOTE_STATIC_PUBLIC_KEY":    handshake.remoteStatic[:],
+		"LOCAL_EPHEMERAL_PRIVATE_KEY": handshake.localEphemeral[:],
+		"PRESHARED_KEY":               handshake.presharedKey[:],
+	} {
+		fmt.Printf("  %s = %s\n", k, base64.StdEncoding.EncodeToString(v))
+	}
+}
+
 var (
 	InitialChainKey [blake2s.Size]byte
 	InitialHash     [blake2s.Size]byte
@@ -192,6 +205,7 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e
 	if err != nil {
 		return nil, err
 	}
+	device.dumpKeys(handshake)
 
 	handshake.mixHash(handshake.remoteStatic[:])
 
@@ -380,6 +394,7 @@ func (device *Device) CreateMessageResponse(peer *Peer) (*MessageResponse, error
 	if err != nil {
 		return nil, err
 	}
+	device.dumpKeys(handshake)
 	msg.Ephemeral = handshake.localEphemeral.publicKey()
 	handshake.mixHash(msg.Ephemeral[:])
 	handshake.mixKey(msg.Ephemeral[:])
-- 
2.35.1