Great script and functions!
Unfortunately your decrypt Function doesn’t work with the certificate you were creating in the step before. You must add “-sky Exchange” to your makecert.exe command to ensure this certificate can be used for key exchange.
Instead you will receive the following error: “Exception calling “Decrypt” with “2″ argument(s): “Bad Key”.

Thanks to Joe Clancy from stackoverflow for this hint: http://stackoverflow.com/questions/2037072/bad-key-exception-for-certificates-with-exportable-private-key

Hopefully it will help some people. I struggled with this problem a few hours

Regards,
Dan