private bool VerifySessionKeys(Stream netStream, EncryptionProvider encryptor, EncryptionProvider decryptor)
{
StreamReader reader = new StreamReader(netStream);
StreamWriter writer = new StreamWriter(netStream);
Packet rec = new Packet();
rec.Data = new byte[1];
rec.TypeID = (int)PacketType.Handshake;
rec.ChannelID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
rec.DestinationUserID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
WriteLine(writer, rec, encryptor);
int size;
rec = ReadLine(reader, decryptor, out size);
if (rec == null)
{
throw new Exception(string.Format("Unable to complete handshake, expected to read an encrypted packet from the input stream, got " + rec ?? "[nothing]"));
}
if (rec.TypeID != (int)PacketType.Handshake)
{
throw new Exception(string.Format("Unable to complete handshake, Expected packet with TypeID {0}", PacketType.Handshake));
}
else
{
return(true);
}
}
private static void SendPubkey(StreamWriter dst, RSAHelper helper)
{
Packet packet = new Packet((int)PacketType.Handshake);
packet.TypeID = (int)PacketType.Handshake;
packet.DestinationUserID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
packet.ChannelID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
packet.Data = handshakeEncoding.GetBytes(helper.PublicKey);
ActualWriteLine(dst, packet);
}
/// <summary>
/// Writes the Key and IV from the specified <see cref="EncryptionProvider"/>
/// <para/>
/// to a new <see cref="Packet"/> using the specified <see cref="RSAHelper"/> to encrypt the values
/// <para/>
/// this method is the counterpart to <see cref="HandshakeHelper.GetDecryptor(RSAHelper, Packet)"/>
/// </summary>
/// <param name="rsa">The <see cref="RSAHelper"/> to use for encrypting the Key and IV</param>
/// <param name="encryptor">The actual Encryptor to take the Key and IV from</param>
/// <returns></returns>
public static Packet WriteEncryptor(RSAHelper rsa, EncryptionProvider encryptor)
{
Packet pkt = new Packet();
MemoryStream outputDataStream = new MemoryStream();
StreamWriter outputWriter = new StreamWriter(outputDataStream);
outputWriter.WriteLine(rsa.EncryptToBase64String(encryptor.IV));
outputWriter.WriteLine(rsa.EncryptToBase64String(encryptor.Key));
outputWriter.Flush();
pkt.TypeID = (int)PacketType.Handshake;
pkt.ChannelID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
pkt.DestinationUserID = CryptoCommon.GetPrngInt(); // Adding an element of randomness to our sent data
pkt.Data = outputDataStream.GetBuffer();
return(pkt);
}
