[xmlsec] MS crypto key integration with xmlsec

[Wouter]

Hi Aleksey and Tej,

Thanks for the input. I didn't look at the latest NSS code yet, so that's
the first thing on my list.

As soon as I have something, which I think is a bit usefull and workable,
I'll send the code around, to be added to CVS (if it makes any sense to
you guys ;)
But probably you'll hear from me sooner with (other) questions.

Regards, Wouter