/// <summary>
/// Gets an <see cref="EncryptionProvider"/> constructed with the Key and IV contained in the specified packet
/// <para/>
/// This method is the counterpart to <see cref="HandshakeHelper.WriteEncryptor(RSAHelper, EncryptionProvider)"/>
/// </summary>
/// <param name="rsa">The "local" <see cref="RSAHelper"/> to use for decrypting the Key and IV</param>
/// <param name="pkt">The received packet</param>
/// <returns></returns>
public static EncryptionProvider GetDecryptor(RSAHelper rsa, Packet pkt)
{
MemoryStream dataStream = new MemoryStream(pkt.Data); // Creating a stream around the packet data for reading
StreamReader dataReader = new StreamReader(dataStream);
byte[] iv = rsa.DecryptBase64String(dataReader.ReadLine());
byte[] key = rsa.DecryptBase64String(dataReader.ReadLine());
return(new EncryptionProvider(key, iv));
}
private bool NegotiateSessionKeys(Stream netStream, out EncryptionProvider decryptor, out EncryptionProvider encryptor, RSAHelper pubRSA, RSAHelper privRSA)
{
StreamReader reader = new StreamReader(netStream);
StreamWriter writer = new StreamWriter(netStream);
encryptor = new EncryptionProvider();
try
{
Packet packet = WriteEncryptor(pubRSA, encryptor);
byte[] serializedPacket = ToySerializer.Serialize(packet);
string sendData = pubRSA.EncryptToBase64String(serializedPacket);
writer.WriteLine(sendData); // Writing the packet as a Base64 encoded string to the network stream in the current instance
writer.Flush();
string read = reader.ReadLine(); // Getting response
packet = ToySerializer.Deserialize <Packet>(privRSA.DecryptBase64String(read));
decryptor = GetDecryptor(privRSA, packet);
}
catch { decryptor = null; return(false); }
return(true);
}