/// <summary>
/// <see cref="Decrypt" /> this instance.
/// </summary>
public virtual void Decrypt()
{
if (this.Client.State >= State.LOGGED)
{
this.Client.SNonce.Increment();
this.Data = Sodium.Decrypt(
new byte[16].Concat(this.Data).ToArray(),
this.Client.SNonce,
this.Client.PublicKey);
this.Reader = new Reader(this.Data);
this.Length = this.Data.Length;
}
}
internal override void Decrypt()
{
this.Device.Keys.SNonce.Increment();
byte[] Decrypted = Sodium.Decrypt(new byte[16].Concat(this.Reader.ReadBytes(this.Length)).ToArray(), this.Device.Keys.SNonce, this.Device.Keys.PublicKey);
if (Decrypted == null)
{
throw new CryptographicException("Tried to decrypt an incomplete message.");
}
this.Reader = new Reader(Decrypted);
this.Length = (ushort)this.Reader.BaseStream.Length;
}
internal virtual void DecryptSodium()
{
if (this.Device.PlayerState >= Client_State.LOGGED)
{
this.Device.Crypto.SNonce.Increment();
byte[] Decrypted = Sodium.Decrypt(new byte[16].Concat(this.Reader.ReadBytes(this.Length)).ToArray(), this.Device.Crypto.SNonce, this.Device.Crypto.PublicKey);
if (Decrypted == null)
{
Server_Resources.Exceptions.Catch(new CryptographicException());
}
this.Reader = new Reader(Decrypted);
this.Length = (ushort)this.Reader.BaseStream.Length;
}
}
internal override void Decrypt()
{
var data = this.Reader.ReadBytes(this.Length);
this.Device.Keys.SNonce.Increment();
Console.WriteLine(BitConverter.ToString(data.ToArray()));
Console.WriteLine(Encoding.UTF8.GetString(data.ToArray()));
byte[] Decrypted = Sodium.Decrypt(data.ToArray(), this.Device.Keys.SNonce, this.Device.Keys.PublicKey);
if (Decrypted == null)
{
throw new CryptographicException("Tried to decrypt an incomplete message.");
}
this.Reader = new Reader(Decrypted);
this.Length = (ushort)this.Reader.BaseStream.Length;
}
internal override void Decrypt()
{
byte[] Buffer = this.Reader.ReadBytes(this.Length);
this.Device.Keys.PublicKey = Buffer.Take(32).ToArray();
Blake2BHasher Blake = new Blake2BHasher();
Blake.Update(this.Device.Keys.PublicKey);
Blake.Update(Key.PublicKey);
this.Device.Keys.RNonce = Blake.Finish();
Buffer = Sodium.Decrypt(Buffer.Skip(32).ToArray(), this.Device.Keys.RNonce, Key.PrivateKey, this.Device.Keys.PublicKey);
this.Device.Keys.SNonce = Buffer.Skip(24).Take(24).ToArray();
this.Reader = new Reader(Buffer.Skip(48).ToArray());
this.Length = (ushort)Buffer.Length;
}
internal virtual void Decrypt()
{
if (Device.PlayerState >= State.LOGGED)
{
Device.Keys.SNonce.Increment();
var Decrypted = Sodium.Decrypt(new byte[16].Concat(Reader.ReadBytes(Length)).ToArray(),
Device.Keys.SNonce, Device.Keys.PublicKey);
if (Decrypted == null)
{
throw new CryptographicException("Tried to decrypt an incomplete message.");
}
Reader = new Reader(Decrypted);
Length = (ushort)Reader.BaseStream.Length;
}
}
public override void Decrypt()
{
var buffer = Reader.ReadBytes(Length);
Device.PublicKey = buffer.Take(32).ToArray();
var Blake = new Blake2BHasher();
Blake.Update(Device.PublicKey);
Blake.Update(Key.PublicKey);
Device.RNonce = Blake.Finish();
buffer = Sodium.Decrypt(buffer.Skip(32).ToArray(), Device.RNonce, Key.PrivateKey, Device.PublicKey);
Device.SNonce = buffer.Skip(24).Take(24).ToArray();
Reader = new Reader(buffer.Skip(48).ToArray());
Length = (ushort)buffer.Length;
}
public virtual void Decrypt()
{
if (Device.State >= State.LOGGED)
{
Device.SNonce.Increment();
var buffer = Reader.ReadBytes(Length);
buffer = Sodium.Decrypt(new byte[16].Concat(buffer).ToArray(), Device.SNonce,
Device.PublicKey);
if (buffer != null)
{
Reader = new Reader(buffer);
Length = buffer.Length;
}
else
{
Length = 0;
}
}
}
/// <summary>
/// <see cref="Decrypt" /> this instance.
/// </summary>
public override void Decrypt()
{
byte[] _Payload = this.Data;
this.Client.PublicKey = _Payload.Take(32).ToArray();
Blake2BHasher _Blake = new Blake2BHasher();
_Blake.Update(this.Client.PublicKey);
_Blake.Update(Keys.Sodium.PublicKey);
this.Client.RNonce = _Blake.Finish();
byte[] _Decrypted = Sodium.Decrypt(
_Payload.Skip(32).ToArray(),
this.Client.RNonce,
Keys.Sodium.PrivateKey,
this.Client.PublicKey);
this.Client.SNonce = _Decrypted.Skip(24).Take(24).ToArray();
this.Data = _Decrypted.Skip(48).ToArray();
this.Reader = new Reader(this.Data);
this.Length = this.Data.Length;
}
private bool ProcessPacket(ReadOnlySpan <byte> data, ref Memory <byte> opus, ref Memory <byte> pcm, IList <ReadOnlyMemory <byte> > pcmPackets, out AudioSender voiceSender, out AudioFormat outputFormat)
{
voiceSender = null;
outputFormat = default;
if (!Rtp.IsRtpHeader(data))
{
return(false);
}
Rtp.DecodeHeader(data, out var sequence, out var timestamp, out var ssrc, out var hasExtension);
var vtx = TransmittingSSRCs[ssrc];
voiceSender = vtx;
if (sequence <= vtx.LastSequence) // out-of-order packet; discard
{
return(false);
}
var gap = vtx.LastSequence != 0 ? sequence - 1 - vtx.LastSequence : 0;
if (gap >= 5)
{
Discord.DebugLogger.LogMessage(LogLevel.Warning, "VNext RX", "5 or more voice packets were dropped when receiving", DateTime.Now);
}
Span <byte> nonce = new byte[Sodium.NonceSize];
Sodium.GetNonce(data, nonce, SelectedEncryptionMode);
Rtp.GetDataFromPacket(data, out var encryptedOpus, SelectedEncryptionMode);
var opusSize = Sodium.CalculateSourceSize(encryptedOpus);
opus = opus.Slice(0, opusSize);
var opusSpan = opus.Span;
try
{
Sodium.Decrypt(encryptedOpus, opusSpan, nonce);
// Strip extensions, if any
if (hasExtension)
{
// RFC 5285, 4.2 One-Byte header
// http://www.rfcreader.com/#rfc5285_line186
if (opusSpan[0] == 0xBE && opusSpan[1] == 0xDE)
{
var headerLen = opusSpan[2] << 8 | opusSpan[3];
var i = 4;
for (; i < headerLen + 4; i++)
{
var @byte = opusSpan[i];
// ID is currently unused since we skip it anyway
//var id = (byte)(@byte >> 4);
var length = (byte)(@byte & 0x0F) + 1;
i += length;
}
// Strip extension padding too
while (opusSpan[i] == 0)
{
i++;
}
opusSpan = opusSpan.Slice(i);
}
// TODO: consider implementing RFC 5285, 4.3. Two-Byte Header
}
if (gap == 1)
{
var lastSampleCount = Opus.GetLastPacketSampleCount(vtx.Decoder);
var fecpcm = new byte[AudioFormat.SampleCountToSampleSize(lastSampleCount)];
var fecpcmMem = fecpcm.AsSpan();
Opus.Decode(vtx.Decoder, opusSpan, ref fecpcmMem, true, out _);
pcmPackets.Add(fecpcm.AsMemory(0, fecpcmMem.Length));
}
else if (gap > 1)
{
var lastSampleCount = Opus.GetLastPacketSampleCount(vtx.Decoder);
for (var i = 0; i < gap; i++)
{
var fecpcm = new byte[AudioFormat.SampleCountToSampleSize(lastSampleCount)];
var fecpcmMem = fecpcm.AsSpan();
Opus.ProcessPacketLoss(vtx.Decoder, lastSampleCount, ref fecpcmMem);
pcmPackets.Add(fecpcm.AsMemory(0, fecpcmMem.Length));
}
}
var pcmSpan = pcm.Span;
Opus.Decode(vtx.Decoder, opusSpan, ref pcmSpan, false, out outputFormat);
pcm = pcm.Slice(0, pcmSpan.Length);
}
finally
{
vtx.LastSequence = sequence;
}
return(true);
}
private void ReceiveVoiceAsync(CancellationToken cancelToken)
{
try
{
byte[] packet, decodingBuffer = null, nonce = null, result;
int packetLength, resultOffset, resultLength;
IPEndPoint endpoint = new IPEndPoint(IPAddress.Any, 0);
if ((_client.Config.VoiceMode & DiscordVoiceMode.Incoming) != 0)
{
decodingBuffer = new byte[MaxOpusSize];
nonce = new byte[24];
}
while (!cancelToken.IsCancellationRequested)
{
Thread.Sleep(1);
if (_udp.Available > 0)
{
packet = _udp.Receive(ref endpoint);
packetLength = packet.Length;
if (packetLength > 0 && endpoint.Equals(_endpoint))
{
if (_state != (int)WebSocketState.Connected)
{
if (packetLength != 70)
{
return;
}
int port = packet[68] | packet[69] << 8;
string ip = Encoding.ASCII.GetString(packet, 4, 70 - 6).TrimEnd('\0');
var login2 = new VoiceLogin2Command();
login2.Payload.Protocol = "udp";
login2.Payload.SocketData.Address = ip;
login2.Payload.SocketData.Mode = _encryptionMode;
login2.Payload.SocketData.Port = port;
QueueMessage(login2);
if ((_client.Config.VoiceMode & DiscordVoiceMode.Incoming) == 0)
{
return;
}
}
else
{
//Parse RTP Data
if (packetLength < 12)
{
return;
}
byte flags = packet[0];
if (flags != 0x80)
{
return;
}
byte payloadType = packet[1];
if (payloadType != 0x78)
{
return;
}
ushort sequenceNumber = (ushort)((packet[2] << 8) |
packet[3] << 0);
uint timestamp = (uint)((packet[4] << 24) |
(packet[5] << 16) |
(packet[6] << 8) |
(packet[7] << 0));
uint ssrc = (uint)((packet[8] << 24) |
(packet[9] << 16) |
(packet[10] << 8) |
(packet[11] << 0));
//Decrypt
if (_isEncrypted)
{
if (packetLength < 28) //12 + 16 (RTP + Poly1305 MAC)
{
return;
}
Buffer.BlockCopy(packet, 0, nonce, 0, 12);
int ret = Sodium.Decrypt(packet, 12, packetLength - 12, decodingBuffer, nonce, _secretKey);
if (ret != 0)
{
continue;
}
result = decodingBuffer;
resultOffset = 0;
resultLength = packetLength - 28;
}
else //Plain
{
result = packet;
resultOffset = 12;
resultLength = packetLength - 12;
}
/*if (_logLevel >= LogMessageSeverity.Debug)
* RaiseOnLog(LogMessageSeverity.Debug, $"Received {buffer.Length - 12} bytes.");*/
string userId;
if (_ssrcMapping.TryGetValue(ssrc, out userId))
{
RaiseOnPacket(userId, _channelId, result, resultOffset, resultLength);
}
}
}
}
}
}
catch (OperationCanceledException) { }
catch (InvalidOperationException) { } //Includes ObjectDisposedException
}
