Add signature to Waku messages

packages/status-communities/src/identity.ts

@@ -6,7 +6,7 @@ import { utils } from "js-waku";
 import * as secp256k1 from "secp256k1";
 
 export class Identity {
-  public constructor(private privateKey: Uint8Array) {}
+  public constructor(public privateKey: Uint8Array) {}
 
   public static generate(): Identity {
     const privateKey = generatePrivateKey();

packages/status-communities/src/messenger.ts

@@ -84,11 +84,10 @@ export class Messenger {
       this.identity
     );
 
-    // TODO: Add signature
     const wakuMessage = await WakuMessage.fromBytes(
       appMetadataMessage.encode(),
       chat.contentTopic,
-      { symKey: chat.symKey }
+      { symKey: chat.symKey, sigPrivKey: this.identity.privateKey }
     );
 
     await this.waku.relay.send(wakuMessage);