Update setting remote id

src/handshake-ik.ts

@@ -56,9 +56,8 @@ export class IKHandshake implements IHandshake {
       try {
         const receivedMessageBuffer = decode1(receivedMsg);
         const plaintext = this.ik.recvMessage(this.session, receivedMessageBuffer);
-        this.remotePeer = await getPeerIdFromPayload(plaintext);
         logger("IK Stage 0 - Responder got message, going to verify payload.");
-        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer.id);
+        this.remotePeer = await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer);
         logger("IK Stage 0 - Responder successfully verified payload!");
       } catch (e) {
         logger("Responder breaking up with IK handshake in stage 0.");
@@ -77,7 +76,7 @@ export class IKHandshake implements IHandshake {
       logger("IK Stage 1 - Initiator got message, going to verify payload.");
 
       try {
-        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer.id);
+        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer);
         logger("IK Stage 1 - Initiator successfully verified payload!");
       } catch (e) {
         logger("Initiator breaking up with IK handshake in stage 1.");

src/handshake-xx-fallback.ts

@@ -57,8 +57,7 @@ export class XXFallbackHandshake extends XXHandshake {
 
       logger("Initiator going to check remote's signature...");
       try {
-        this.remotePeer = await getPeerIdFromPayload(plaintext);
-        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer.id);
+        this.remotePeer = await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer);
       } catch (e) {
         throw new Error(`Error occurred while verifying signed payload from responder: ${e.message}`);
       }

src/handshake-xx.ts

@@ -72,8 +72,7 @@ export class XXHandshake implements IHandshake {
 
       logger("Initiator going to check remote's signature...");
       try {
-        this.remotePeer = await getPeerIdFromPayload(plaintext);
-        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer.id);
+        this.remotePeer = await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer);
       } catch (e) {
         throw new Error(`Error occurred while verifying signed payload: ${e.message}`);
       }
@@ -97,11 +96,10 @@ export class XXHandshake implements IHandshake {
       logger('Stage 2 - Responder waiting for third handshake message...');
       const receivedMessageBuffer = decode1(await this.connection.readLP());
       const plaintext = this.xx.recvMessage(this.session, receivedMessageBuffer);
-      this.remotePeer = await getPeerIdFromPayload(plaintext);
       logger('Stage 2 - Responder received the message, finished handshake. Got remote\'s static key.');
 
       try {
-        await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer.id);
+        this.remotePeer = await verifySignedPayload(receivedMessageBuffer.ns, plaintext, this.remotePeer);
       } catch (e) {
         throw new Error(`Error occurred while verifying signed payload: ${e.message}`);
       }

src/utils.ts

@@ -82,7 +82,18 @@ async function isValidPeerId(peerId: bytes, publicKeyProtobuf: bytes) {
   return generatedPeerId.id.equals(peerId);
 }
 
-export async function verifySignedPayload(noiseStaticKey: bytes, plaintext: bytes, peerId: bytes) {
+/**
+ * Verifies signed payload and returns peer id that has sent the payload.
+ * @param {bytes} noiseStaticKey - owner's noise static key
+ * @param {bytes} plaintext - encoded payload
+ * @param {PeerId} remotePeer - (optional) owner's libp2p peer ID
+ * @returns {Promise<PeerId>} - peer ID of payload owner
+ */
+export async function verifySignedPayload(
+  noiseStaticKey: bytes,
+  plaintext: bytes,
+  remotePeer?: PeerId
+): Promise<PeerId> {
   let receivedPayload;
   try {
     const NoiseHandshakePayload = await loadPayloadProto();
@@ -97,7 +108,9 @@ export async function verifySignedPayload(noiseStaticKey: bytes, plaintext: byte
     throw new Error("Failed to decode received payload. Reason: " + e.message);
   }
 
-  if (!(await isValidPeerId(peerId, receivedPayload.identityKey)) ) {
+  remotePeer = remotePeer || await getPeerIdFromPayload(plaintext);
+
+  if (!(await isValidPeerId(remotePeer.id, receivedPayload.identityKey)) ) {
     throw new Error("Peer ID doesn't match libp2p public key.");
   }
 
@@ -108,6 +121,8 @@ export async function verifySignedPayload(noiseStaticKey: bytes, plaintext: byte
   if (!publicKey.verify(generatedPayload, receivedPayload.identitySig)) {
     throw new Error("Static key doesn't match to peer that signed payload!");
   }
+
+  return remotePeer;
 }
 
 export function getHkdf(ck: bytes32, ikm: bytes): Hkdf {

test/noise.test.ts

@@ -300,4 +300,35 @@ describe("Noise", () => {
       assert(false, e.message);
     }
   });
+
+  it("should working without remote peer provided in incoming connection", async() => {
+    try {
+      const staticKeysInitiator = generateKeypair();
+      const noiseInit = new Noise(staticKeysInitiator.privateKey);
+      const staticKeysResponder = generateKeypair();
+      const noiseResp = new Noise(staticKeysResponder.privateKey);
+
+      // Prepare key cache for noise pipes
+      KeyCache.store(localPeer, staticKeysInitiator.publicKey);
+      KeyCache.store(remotePeer, staticKeysResponder.publicKey);
+
+      const [inboundConnection, outboundConnection] = DuplexPair();
+      const [outbound, inbound] = await Promise.all([
+        noiseInit.secureOutbound(localPeer, outboundConnection, remotePeer),
+        noiseResp.secureInbound(remotePeer, inboundConnection),
+      ]);
+      const wrappedInbound = Wrap(inbound.conn);
+      const wrappedOutbound = Wrap(outbound.conn);
+
+      wrappedOutbound.writeLP(Buffer.from("test v2"));
+      const response = await wrappedInbound.readLP();
+      expect(response.toString()).equal("test v2");
+
+      assert(inbound.remotePeer.marshalPubKey().equals(localPeer.marshalPubKey()));
+      assert(outbound.remotePeer.marshalPubKey().equals(remotePeer.marshalPubKey()));
+    } catch (e) {
+      console.error(e);
+      assert(false, e.message);
+    }
+  });
 });