protected virtual Result Record_ApplicationData(Records.ApplicationData rec)
{
if (State == TLSSessionState.Server_Finished)
{
var decrypt = _params.Cipher.BulkDecrypt(rec.EncryptedData, rec.IV);
var body = decrypt.Take(decrypt.Length - _params.Cipher.GetMacLength()).ToArray();
var mac = decrypt.Skip(body.Length).Take(_params.Cipher.GetMacLength()).ToArray();
var macseed = Utils.GetMacSeed(_receiveSeqNum, (byte)RecordType.ApplicationData, body);
var mymac = _params.Cipher.ClientMessageAuthCode(macseed);
if (!Utils.BytesEqual(mac, mymac))
{
return(Result.FatalAlert(AlertDescription.bad_record_mac, $"unmatched MAC in Client_ApplicationData message"));
}
_receiveSeqNum++;
return(new ApplicationResult(body));
}
else
{
return(Result.FatalAlert(AlertDescription.unexpected_message, $"State [{State}] check failed on Client_ApplicationData message"));
}
}
protected override Result Record_ApplicationData(Records.ApplicationData rec)
{
if (State == TLSSessionState.Client_ChangeCipherSpec)
{
var clientFinish = (_params.Cipher as Ciphers.CipherSuiteBase13).BulkDecrypt_Handshake(rec.Payload, rec.GetHeaderBytes());
var recType = (RecordType)clientFinish.Last();
var recPayload = clientFinish.Take(clientFinish.Length - 1).ToArray();
var decodedRec = Records.TLSRecord.Factory(recType, recPayload);
Console.WriteLine($">>>>>>>> RECEIVE encrypted TLS {recType}");
return(Process_Record(decodedRec));
}
else if (State == TLSSessionState.Client_Finished)
{
var appdata = (_params.Cipher as Ciphers.CipherSuiteBase13).BulkDecrypt(rec.Payload, rec.GetHeaderBytes());
var recType = (RecordType)appdata.Last();
var recPayload = appdata.Take(appdata.Length - 1).ToArray();
if (recType == RecordType.ApplicationData)
{
return(new ApplicationResult(recPayload));
}
else
{
var decodedRec = Records.TLSRecord.Factory(recType, recPayload);
Console.WriteLine($">>>>>>>> RECEIVE encrypted TLS {recType}");
return(Process_Record(decodedRec));
}
}
return(Result.FatalAlert(AlertDescription.unexpected_message, $"State [{State}] check failed on Client_ApplicationData message"));
}
public virtual Result GetEncryptedPacket(byte[] rawDataToSend)
{
if (State == TLSSessionState.Server_Finished)
{
var macSeed = Utils.GetMacSeed(_sendSeqNum, (byte)RecordType.ApplicationData, rawDataToSend);
var myMac = _params.Cipher.ServerMessageAuthCode(macSeed);
var serverIv = Utils.Random(16);
var message = new List <byte>();
message.AddRange(rawDataToSend);
message.AddRange(myMac);
var encryptedMsg = _params.Cipher.BulkEncrypt(message.ToArray(), serverIv);
var appdata = new Records.ApplicationData(serverIv.Concat(encryptedMsg).ToArray());
_sendSeqNum++;
return(new PacketResult(new[] { appdata }));
}
else
{
return(Result.FatalAlert(AlertDescription.unexpected_message, $"State [{State}] check failed on Server_ApplicationData create"));
}
}
