Yes, the available API could be used for signing AND verification. And also,
as I learned today, MS also offers a non .NET set of APIs for C and C++
developers.
"The Windows 7 Packaging feature is a set of COM-based API that provides
support for accessing, modifying, and saving packages by using C and C++." -
(http://msdn.microsoft.com/en-us/library/dd371623.aspx) 

(from:
http://blogs.msdn.com/b/dmahugh/archive/2011/04/19/libopc-version-0-0-1-released.aspx)
Historically, there have been two popular .NET APIs for Open XML
development: System.IO.Packaging (which first appeared in .NET 3.0) and the
Open XML SDK, released in early 2007. There’s also a COM-based native
packaging API available for non-.NET Windows developers.


Aside from this, some enthusiasts began working on a open source component
for working with OPC container named libopc. They also wrote a LibreOffice
extension for working with MS formats as an alternative to the LO native
support for MS formats. It could turn out an interesting project. 
(http://www.youtube.com/watch?v=RzUlEVLnz6U&feature=player_embedded#!)

Dragan



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