wireguard: cleanup Config parser using BinaryKey

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/wireguard/config.go

@@ -1,7 +1,6 @@
 package wireguard
 
 import (
-	"encoding/base64"
 	"errors"
 	"fmt"
 	"io"
@@ -32,13 +31,13 @@ func (f *Config) Peers() int {
 // InterfaceConfig represents the [Interface] section
 type InterfaceConfig struct {
 	Address    netip.Addr
-	PrivateKey []byte
+	PrivateKey BinaryKey
 	ListenPort uint16
 }
 
 // PeerConfig represents a [Peer] section
 type PeerConfig struct {
-	PublicKey  []byte
+	PublicKey  BinaryKey
 	Endpoint   EndpointAddress
 	AllowedIPs []netip.Prefix
 }
@@ -129,19 +128,19 @@ type interfaceConfig struct {
 }
 
 func (p interfaceConfig) Export() (InterfaceConfig, error) {
+	var err error
+
 	out := InterfaceConfig{
 		Address:    p.Address,
 		ListenPort: p.ListenPort,
 	}
 
-	b, err := base64.StdEncoding.DecodeString(p.PrivateKey)
+	out.PrivateKey, err = BinaryKeyFromBase64(p.PrivateKey)
 	if err != nil {
 		err = core.Wrap(err, "PrivateKey")
 		return InterfaceConfig{}, err
 	}
 
-	out.PrivateKey = b
-
 	return out, nil
 }
 
@@ -163,8 +162,7 @@ func (v *intermediateConfig) ExportPeer(i int) (PeerConfig, error) {
 	}
 
 	// PublicKey
-	s = v.Peer.PublicKey[i]
+	out.PublicKey, err = BinaryKeyFromBase64(v.Peer.PublicKey[i])
-	out.PublicKey, err = base64.StdEncoding.DecodeString(s)
 	if err != nil {
 		err = core.Wrap(err, "PublicKey")
 		return out, err