// sends a connection challenge packet to the endpoint
private void sendConnectionChallenge(NetcodePrivateConnectToken connectToken, EndPoint endpoint)
{
log("Sending connection challenge", NetcodeLogLevel.Debug);
var challengeToken = new NetcodeChallengeToken();
challengeToken.ClientID = connectToken.ClientID;
challengeToken.UserData = connectToken.UserData;
ulong challengeSequence = nextChallengeSequenceNumber++;
byte[] tokenBytes = BufferPool.GetBuffer(300);
using (var tokenWriter = ByteArrayReaderWriter.Get(tokenBytes))
challengeToken.Write(tokenWriter);
byte[] encryptedToken = BufferPool.GetBuffer(300);
int encryptedTokenBytes;
try
{
encryptedTokenBytes = PacketIO.EncryptChallengeToken(challengeSequence, tokenBytes, challengeKey, encryptedToken);
}
catch
{
BufferPool.ReturnBuffer(tokenBytes);
BufferPool.ReturnBuffer(encryptedToken);
return;
}
var challengePacket = new NetcodeConnectionChallengeResponsePacket();
challengePacket.ChallengeTokenSequence = challengeSequence;
challengePacket.ChallengeTokenBytes = encryptedToken;
var cryptIdx = encryptionManager.FindEncryptionMapping(endpoint, time);
if (cryptIdx == -1)
{
return;
}
var cryptKey = encryptionManager.GetSendKey(cryptIdx);
serializePacket(new NetcodePacketHeader()
{
PacketType = NetcodePacketType.ConnectionChallenge
}, (writer) =>
{
challengePacket.Write(writer);
}, endpoint, cryptKey);
BufferPool.ReturnBuffer(tokenBytes);
BufferPool.ReturnBuffer(encryptedToken);
}