However there's an independent implementation using the system's crypto primitives, originally written for DragonFlyBSD:

See

http://leaf.dragonflybsd.org/cgi/web-man?command=tcplay&sect...

and

https://wiki.archlinux.org/index.php/Tcplay

That won't help much for Windows (esp. not with system encryption), but it might be able to help guard against weak key generation.