Sodium (#1172)

* Use Native libsodium when available

* add newline

* fix typo of exports

* add to webpack ignore

* Update Secretbox.js

src/client/voice/dispatcher/StreamDispatcher.js

@@ -1,7 +1,8 @@
 const VolumeInterface = require('../util/VolumeInterface');
-const NaCl = require('tweetnacl');
 const VoiceBroadcast = require('../VoiceBroadcast');
 
+const secretbox = require('../util/Secretbox');
+
 const nonce = Buffer.alloc(24);
 nonce.fill(0);
 
@@ -149,7 +150,7 @@ class StreamDispatcher extends VolumeInterface {
     packetBuffer.writeUIntBE(this.player.voiceConnection.authentication.ssrc, 8, 4);
 
     packetBuffer.copy(nonce, 0, 0, 12);
-    buffer = NaCl.secretbox(buffer, nonce, this.player.voiceConnection.authentication.secretKey.key);
+    buffer = secretbox.close(buffer, nonce, this.player.voiceConnection.authentication.secretKey.key);
     for (let i = 0; i < buffer.length; i++) packetBuffer[i + 12] = buffer[i];
 
     return packetBuffer;

src/client/voice/receiver/VoiceReceiver.js

@@ -1,5 +1,5 @@
 const EventEmitter = require('events').EventEmitter;
-const NaCl = require('tweetnacl');
+const secretbox = require('../util/Secretbox');
 const Readable = require('./VoiceReadable');
 const OpusEncoders = require('../opus/OpusEngineList');
 
@@ -123,7 +123,7 @@ class VoiceReceiver extends EventEmitter {
 
   handlePacket(msg, user) {
     msg.copy(nonce, 0, 0, 12);
-    let data = NaCl.secretbox.open(msg.slice(12), nonce, this.voiceConnection.authentication.secretKey.key);
+    let data = secretbox.open(msg.slice(12), nonce, this.voiceConnection.authentication.secretKey.key);
     if (!data) {
       /**
        * Emitted whenever a voice packet experiences a problem.

src/client/voice/util/Secretbox.js

@@ -0,0 +1,13 @@
+try {
+  const sodium = require('sodium');
+  module.exports = {
+    open: sodium.api.crypto_secretbox_open,
+    close: sodium.api.crypto_secretbox,
+  };
+} catch (err) {
+  const tweetnacl = require('tweetnacl');
+  module.exports = {
+    open: tweetnacl.secretbox.open,
+    close: tweetnacl.secretbox,
+  };
+}