public byte[] LoadKeyBlock(string timestamp, string ski, string hash, byte[] sessionKey)
{
var unencryptedMsgPart = $"{_settings.MessageFormat}~{_settings.Company}~{timestamp}~{_settings.MachineId}~";
var encryptedMsgPart = $"{_settings.ClientId}~GetAllChannelKeys~{_settings.Company}~{ski.ToUpper()}~{hash}~{_settings.MachineId}~ ~ ~";
var msg = Encoding.ASCII.GetBytes(unencryptedMsgPart).ToList();
msg.AddRange(RC4.Encrypt(sessionKey, Encoding.ASCII.GetBytes(encryptedMsgPart)));
_logger.Debug($"GetAllChannelKeys from server: {unencryptedMsgPart}{encryptedMsgPart}");
return(msg.ToArray());
}
public byte[] GetEncryptedPassword(string timestamp, string ski, byte[] sessionKey)
{
var unencryptedMsgPart = $"{_settings.MessageFormat}~{_settings.Company}~{timestamp}~{_settings.MachineId}~";
var encryptedMsgPart = $"{_settings.ClientId}~GetEncryptedPassword~{_settings.Company}~{ski}~";
_logger.Debug($"Get encryption password: {unencryptedMsgPart}{encryptedMsgPart}");
var msg = Encoding.ASCII.GetBytes(unencryptedMsgPart).ToList();
msg.AddRange(RC4.Encrypt(sessionKey, Encoding.ASCII.GetBytes(encryptedMsgPart)));
return(msg.ToArray());
}
private byte[] Rc4Encrypt(string unencryptedMsgPart, string encryptedMsgPart, byte[] sessionKey, string debugMessage)
{
var encryptedData = RC4.Encrypt(sessionKey, Encoding.ASCII.GetBytes(encryptedMsgPart));
unencryptedMsgPart = Add1155Header(unencryptedMsgPart, encryptedData.Length);
_logger.Debug($"{debugMessage}: {unencryptedMsgPart}{encryptedMsgPart}");
var msg = Encoding.ASCII.GetBytes(unencryptedMsgPart).ToList();
msg.AddRange(encryptedData);
return(msg.ToArray());
}
bool GetEncryptedPassword()
{
var msg = Protocol.GetEncryptedPassword(_timestamp, _ski, _sessionKey);
var response = _sslClient.SendAndReceive(msg, _settings.VcasServer, _settings.VcasPort + 1, false);
if (response == null || response.Length <= 8)
{
_logger.Error("Failed to GetEncryptedPassword, no valid response!");
return(false);
}
var encryptedPassword = response.Skip(4).Take(response.Length - 4).ToArray();
var decrypted = RC4.Decrypt(_sessionKey, encryptedPassword);
var passwordHex = Encoding.ASCII.GetString(decrypted.Skip(4).ToArray());
_logger.Info($"GetEncryptedPassword completed: {passwordHex}");
return(true);
}
bool SaveEncryptedPassword()
{
_password = new byte[32];
new Random().NextBytes(_password);
var encodedBytes = RC4.Encrypt(_sessionKey, _password);
var password = BytesAsHex(encodedBytes);
var msg = Protocol.SaveEncryptedPassword(_timestamp, _ski, password, _sessionKey);
var response = _sslClient.SendAndReceive(msg, _settings.VcasServer, _settings.VcasPort + 1, false);
if (response == null || response.Length < 8)
{
_logger.Error("Failed to SaveEncryptedPassword, no valid response!");
return(false);
}
_logger.Info($"SaveEncryptedPassword completed, size: {response.Length}");
return(true);
}
bool LoadKeyBlock()
{
var hash = GenerateSignedHash();
var msg = Protocol.LoadKeyBlock(_timestamp, _ski, hash, _sessionKey);
var response = _sslClient.SendAndReceive(msg, _settings.VksServer, _settings.VksPort, false);
if (response == null || response.Length < 10)
{
_logger.Error("Failed to GetAllChannelKeys, no valid response!");
return(false);
}
var encrypted = response.Skip(4).ToArray();
var decrypted = RC4.Decrypt(_sessionKey, encrypted);
File.WriteAllBytes(KeyblockFile, decrypted);
_logger.Info($"GetAllChannelKeys completed: {decrypted.Length} bytes");
return(true);
}
