How to find whether a file is digitally signed

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5.00/5 (2 votes)

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Hi,

I have few Word and Excel files. Some of them are digitally signed. How do i programatically find whether the file has any digital signature ?

I referred to a code base mentioned in MSDN and other forums (converting the msdn code to .NET). But it didn't worked for me.

Can anyone suggest how to acheive this ?

I used XML approach for Digitally signing the documents.

Thanks in Advance

Posted 5-Oct-11 8:31am

YKK Reddy

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Sergey Alexandrovich Kryukov 5-Oct-11 14:35pm

Good question, my 5.
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-10-05T08:39:00

Solution 1

With Word interop, use _Document.Signatires property:
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.word._document.signatures%28v=office.14%29.aspx[^].

Likewise, with Excel, use _Workbook.Signatures:
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel._workbook.signatures.aspx[^].

Did you try it?

—SA

Posted 5-Oct-11 8:39am

Sergey Alexandrovich Kryukov

v2

Comments

[no name] 5-Oct-11 15:11pm

Hi,

Can you post a sample code. I have tried to use it but i somehow failed.

Sergey Alexandrovich Kryukov 5-Oct-11 15:47pm

Sorry, I don't have any time for a code sample in this field right now, hard to say when I can get it.
Could you try yourself more accurately and explain the problems?
--SA

[no name] 5-Oct-11 15:17pm

Hi,

i have tried ur solution. It works fine except that there is a slight modification.

After making a call _Document.Signatures, the return value we get contains a flag "CanAddSignatureLine".
If it is true, the document is not digitally signed and vice-versa.

Thanks a ton man.

Sergey Alexandrovich Kryukov 5-Oct-11 15:48pm

Oh, great, no experimenting anymore, thanks for reporting it back! Good point, by the way, good to know.
So, it looks like the issue is resolved, right?

You're welcome,
Good luck, call again.
--SA

Espen Harlinn 5-Oct-11 15:22pm

5'ed!

Sergey Alexandrovich Kryukov 5-Oct-11 15:48pm

Thank you, Espen.
--SA