[xmlsec] How to use X509 certicate encrypt a XML file?

[Aleksey Sanin]

>    I need you help because the help of XMLSec document didn't mention this method.
Well, the documentation does not mention this because it is impossible
(hint: certificate has "public" key that everybody knows, if you encrypt
something with "private" key then *anyone* can decrypt it). Probably you
should read a book about cryptography first.

Aleksey