add simple wireguard support

cmd/dkl-local-server/wireguard.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+var wgKeys = KVSecrets[string]{"wireguard"}
+
+func wgKey(path string) (key string, err error) {
+	return wgKeys.GetOrCreate(path, func() (key string, err error) {
+		k, err := wgtypes.GeneratePrivateKey()
+		if err != nil {
+			return
+		}
+		key = k.String()
+		return
+	})
+}
+
+func wgPSKey(path string) (key string, err error) {
+	return wgKeys.GetOrCreate(path, func() (key string, err error) {
+		k, err := wgtypes.GenerateKey()
+		if err != nil {
+			return
+		}
+		key = k.String()
+		return
+	})
+}
+
+func wgPubKey(path string) (pubkey string, err error) {
+	key, err := wgKey(path)
+	if err != nil {
+		return
+	}
+
+	k, err := wgtypes.ParseKey(key)
+	if err != nil {
+		return
+	}
+
+	pubkey = k.PublicKey().String()
+	return
+}