public void GetSignedFieldsForPingPongHMAC(BinaryWriter writer)
{
writer.Write((byte)PacketTypes.DmpPing);
DirectChannelToken32.Encode(writer);
writer.Write(PingRequestId32);
if (PublicEcdheKey != null)
{
PublicEcdheKey.Encode(writer);
}
}
internal static LowLevelUdpResponseScanner GetScanner(DirectChannelToken32 localDirectChannelToken32, InviteSession session)
{
if (!session.DerivedDirectChannelSharedDhSecretsAE)
{
throw new InvalidOperationException("DerivedDirectChannelSharedDhSecretsAE=false");
}
BinaryProcedures.CreateBinaryWriter(out var ms, out var w);
w.Write((byte)PacketTypes.MessageStart);
localDirectChannelToken32.Encode(w);
return(new LowLevelUdpResponseScanner
{
ResponseFirstBytes = ms.ToArray(),
OptionalFilter = (udpData) =>
{
if (!session.DerivedDirectChannelSharedDhSecretsAE)
{
return false;
}
var msgStart = Decode(udpData);
if (msgStart.MessageHMAC.Equals(
session.GetMessageHMAC(w2 => msgStart.GetSignedFieldsForMessageHMAC(w2, true))
) == false)
{
return false;
}
return true;
}
});
}
public byte[] Encode()
{
BinaryProcedures.CreateBinaryWriter(out var ms, out var writer);
writer.Write((byte)PacketTypes.MessageStart);
DirectChannelToken32.Encode(writer);
writer.Write(MessageId32);
byte flags = 0;
writer.Write(flags);
writer.Write(MessageTimestamp64);
BinaryProcedures.EncodeByteArray65536(writer, EncryptedMessageData);
MessageHMAC.Encode(writer);
var r = ms.ToArray();
if (r.Length > 500)
{
throw new ArgumentException();
}
return(r);
}
static void GetHeaderFields(BinaryWriter writer, DirectChannelToken32 directChannelToken32, uint pingRequestId32)
{
writer.Write((byte)PacketTypes.DmpPong);
directChannelToken32.Encode(writer);
writer.Write(pingRequestId32);
}