voice: fix voice receive after enabling suffix and lite encryption modes

src/client/voice/dispatcher/StreamDispatcher.js

@@ -248,7 +248,7 @@ class StreamDispatcher extends Writable {
     packetBuffer.writeUIntBE(this.player.voiceConnection.authentication.ssrc, 8, 4);
 
     packetBuffer.copy(nonce, 0, 0, 12);
-    return Buffer.concat([packetBuffer, ...this._encrypt(buffer, sequence)]);
+    return Buffer.concat([packetBuffer, ...this._encrypt(buffer)]);
   }
 
   _sendPacket(packet) {

src/client/voice/receiver/PacketHandler.js

@@ -1,4 +1,3 @@
-const nonce = Buffer.alloc(24);
 const secretbox = require('../util/Secretbox');
 const EventEmitter = require('events');
 
@@ -7,6 +6,7 @@ class Readable extends require('stream').Readable { _read() {} } // eslint-disab
 class PacketHandler extends EventEmitter {
   constructor(receiver) {
     super();
+    this.nonce = Buffer.alloc(24);
     this.receiver = receiver;
     this.streams = new Map();
   }
@@ -27,10 +27,22 @@ class PacketHandler extends EventEmitter {
   }
 
   parseBuffer(buffer) {
-    // Reuse nonce buffer
+    const { secretKey, encryptionMode } = this.receiver.connection.authentication;
-    buffer.copy(nonce, 0, 0, 12);
 
-    let packet = secretbox.methods.open(buffer.slice(12), nonce, this.receiver.connection.authentication.secretKey);
+    // Choose correct nonce depending on encryption
+    let end;
+    if (encryptionMode === 'xsalsa20_poly1305_lite') {
+      buffer.copy(this.nonce, 0, buffer.length - 4);
+      end = buffer.length - 4;
+    } else if (encryptionMode === 'xsalsa20_poly1305_suffix') {
+      buffer.copy(this.nonce, 0, buffer.length - 24);
+      end = buffer.length - 24;
+    } else {
+      buffer.copy(this.nonce, 0, 0, 12);
+    }
+
+    // Open packet
+    let packet = secretbox.methods.open(buffer.slice(12, end), this.nonce, secretKey);
     if (!packet) return new Error('Failed to decrypt voice packet');
     packet = Buffer.from(packet);