[xmlsec] Support for Microsoft CryptoAPI and certificate store

[Aleksey Sanin]

Hi, Glenn!

Personally, I don't need MS CryptoAPI but I would be glad to help
you with any questions you might have. And yes, I would be happy
to put your work in xmlsec.
AFAIK, Olger Warnier is already trying to implement MS CryptoAPI
support (search mailing list archive for more details). Probably you
can work together on this.

Aleksey