how to airplay from mac to airport express

So I took it apart (I still have scars from opening the glued case!), dumped the ROM, and reverse engineered the keys out of it. However, I was disappointed to find that Apple used a public-key crypto scheme, and there’s a private key hiding inside the ApEx. I figured it’d be easy to find an ApEx emulator - there are several open source apps out there to play to them. My girlfriend moved house, and her Airport Express no longer made it with her wireless access point.

After the unification of streaming under the AirPlay name, several hacks in the past months allowed iOS and Mac users to enable streaming on unsupported devices such as iPhones or Macs. Developer James Laird, however, has achieved a different goal than simply activating audio and video receiving functionalities: by reverse engineering the AirPort Express (and thus AirTunes) private key used by Apple to stream audio to external music speakers, he released ShairPort, an open source AirPort Express emulator.

When Apple introduced AirPlay with iOS 4.2, they brought wireless streaming for music and video to iOS devices, as well as iTunes on the desktop thanks to the old AirTunes technology that allowed music streaming to an AirPort Express station connected to speakers with a simple audio jack.

How to airplay from mac to airport express