https://bz.apache.org/bugzilla/show_bug.cgi?id=63011
Bug ID: 63011
Summary: Multiple digital sign in excel file broke first
signature
Product: POI
Version: unspecified
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 36325
--> https://bz.apache.org/bugzilla/attachment.cgi?id=36325&action=edit
Blank Excel file which I need to sign
Hi guys,
I am trying to use apache POI library to sign Excel file. I need to sign it
multiple times with different certificates (keys) to verify identity of all
signers.
With example from apache POI encryption page I am able to sign file exactly
once. The signature is valid but when I do it again, with different key the
previous sign is removed and the excel file is signed only with the last key
that I used.
Is there any option how to sign Excel file and keep previous digital signatues?
Thanks,
Martin
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