/// <summary>
/// Initial response from server to client.
/// </summary>
/// <param name="Client">A NetworkClient instance.</param>
/// <param name="Packet">A ProcessedPacket instance.</param>
public static void HandleServerChallenge(NetworkClient Client, ProcessedPacket Packet)
{
Console.WriteLine("Client receives encrypted data - test 2");
byte[] PacketBuf = new byte[Packet.ReadByte()];
Packet.Read(PacketBuf, 0, (int)PacketBuf.Length);
ECDiffieHellmanPublicKey ServerPub = StaticStaticDiffieHellman.ImportKey("ServerPublic.dat");
MemoryStream DecryptedStream = new MemoryStream(StaticStaticDiffieHellman.Decrypt(ClientKey, ServerPub,
ClientNOnce.ToByteArray(), PacketBuf));
BinaryReader Reader = new BinaryReader(DecryptedStream);
Guid ChallengeResponse = new Guid(Reader.ReadBytes(Reader.ReadByte()));
SessionKey = Reader.ReadBytes(Reader.ReadByte());
IV = Reader.ReadBytes(Reader.ReadByte());
//Yay, we have key and IV, we can now start encryption with AES!
AES AesEncryptor = new AES(SessionKey, IV);
PacketStream EncryptedPacket = new PacketStream(0x03, 0);
EncryptedPacket.WriteHeader();
MemoryStream StreamToEncrypt = new MemoryStream();
BinaryWriter Writer = new BinaryWriter(StreamToEncrypt);
Writer.Write((byte)ChallengeResponse.ToByteArray().Length);
Writer.Write(ChallengeResponse.ToByteArray(), 0, ChallengeResponse.ToByteArray().Length);
//Encrypt data using key and IV from server, hoping that it'll be decrypted correctly at the other end...
byte[] EncryptedData = AesEncryptor.Encrypt(StreamToEncrypt.ToArray());
EncryptedPacket.WriteUInt16((ushort)(PacketHeaders.UNENCRYPTED + EncryptedData.Length + 1));
EncryptedPacket.WriteByte((byte)EncryptedData.Length);
EncryptedPacket.Write(EncryptedData, 0, EncryptedData.Length);
Client.Send(EncryptedPacket.ToArray());
Console.WriteLine("Test 2: passed!");
}
/// <summary>
/// Initial response from server to client.
/// </summary>
/// <param name="Client">A NetworkClient instance.</param>
/// <param name="Packet">A ProcessedPacket instance.</param>
public static void HandleServerChallenge(NetworkClient Client, ProcessedPacket Packet)
{
Console.WriteLine("Client receives encrypted data - test 2");
ServerPublicKey = Packet.ReadBytes(Packet.ReadByte());
byte[] EncryptedData = Packet.ReadBytes(Packet.ReadByte());
AESEncryptor Enc = (AESEncryptor)Client.ClientEncryptor;
Enc.PublicKey = ServerPublicKey;
Client.ClientEncryptor = Enc;
NetworkFacade.Client.ClientEncryptor = Enc;
ECDiffieHellmanCng PrivateKey = Client.ClientEncryptor.GetDecryptionArgsContainer().AESDecryptArgs.PrivateKey;
byte[] NOnce = Client.ClientEncryptor.GetDecryptionArgsContainer().AESDecryptArgs.NOnce;
byte[] ChallengeResponse = StaticStaticDiffieHellman.Decrypt(PrivateKey,
ECDiffieHellmanCngPublicKey.FromByteArray(ServerPublicKey, CngKeyBlobFormat.EccPublicBlob),
NOnce, EncryptedData);
MemoryStream StreamToEncrypt = new MemoryStream();
BinaryWriter Writer = new BinaryWriter(StreamToEncrypt);
Writer.Write((byte)ChallengeResponse.Length);
Writer.Write(ChallengeResponse, 0, ChallengeResponse.Length);
Writer.Write(Client.ClientEncryptor.Username);
Writer.Write((byte)PasswordHash.Length);
Writer.Write(PasswordHash);
Writer.Flush();
Client.SendEncrypted(0x03, StreamToEncrypt.ToArray());
Console.WriteLine("Test 2: passed!");
}