This can't possibly work, there's not a single line of code in there that plays those sweet mod tunes that every good keygen plays when you start it.<p>All kidding aside, this looks like a fork or reimplementation for the tool that got popular recently, based on a blog post from a few years back.
The private key was small but I suppose it was considered adequate at the time of release; it was cracked a long time ago (late 2009 was when I first learned of it) and an earlier keygen exists. Stuff like this tends to remain private/hard-to-discover, but I'm not surprised to see it publicised now.<p>Here's some more details:<p><a href="https://sabah.forumotion.com/t333-all-you-need-to-know-about-windows-product-keys" rel="nofollow">https://sabah.forumotion.com/t333-all-you-need-to-know-about...</a><p>The key phrase is at the end: "Therefore, the complexity of computing the private key k is O(2^31)"
Seems to be a fork of the original <a href="https://github.com/TheMCHK/WindowsXPKg">https://github.com/TheMCHK/WindowsXPKg</a>