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Posted by Joao Maia on October 19, 2006, 5:30 am
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Hi there,
I am developing a component to digitally sign files, and I need some
help with MS Office files. What I want to do is programatically (using
.NET plaftorm 1.1) sign MS Office files (Word, Excel, Powerpoint) given
a X509 Certificate.
I have an X509Certificate object (or a PKCS#12 pfx file with a
certificate) and I want to pass it to some method that will use it to
sign the .doc, .xls, or .ppt (and embed the signature on the file as if
I would have signed it from wihtin the program itself). I know that on
the MS Word object model there is an ActiveDocument.Signatures.Add()
method, but that method will pop up the window for the user to select
the certificate he wants to use. Since I do the certificate selection
bit beforehand, I have no need for that window to appear. Instead I
would like to pass the certificate object that I already have to the
method.... Is there any way to do this on the Word (or Office) object
model ?
I have been able to do this with Adobe pdf files, by using a third
party library called itextsharp, but I haven't been able to find out
any library like this for MS Office files. If it can't be done using
the MS Office object model, but there is any third-party component that
does this (even if I have to pay for it), please let me know about it.
I'm really desperate... :(
Thanks.
Cheers from Portugal,
Joao Maia
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