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https://issues.apache.org/jira/browse/PDFBOX-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15471134#comment-15471134
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Tilman Hausherr commented on PDFBOX-3065:
-----------------------------------------

todo for me:
- commit 2.0
- commit 2.1
- commit tests 2.0 (not reviewed yet)
- commit tests 2.1 (not reviewed yet)
- remove old signing from 2.1
- fix problems seen in code review
- add text for 2.0.3 that it might change
- check javadoc rendering
- remind Andreas to include this in 2.0.3 announcement
- tell people in signing issues
- mention on dev list


> Right now PDFBOX does not permit to sign multiple files while calling an 
> external signing service.
> --------------------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-3065
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3065
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Signing
>    Affects Versions: 1.8.10
>         Environment: Any Operating systems.
>            Reporter: Andrea Paternesi
>            Assignee: Tilman Hausherr
>              Labels: features
>             Fix For: 2.0.3, 2.1.0
>
>         Attachments: CreateSignature_test.patch, 
> PDFBOX-3065_viaExternalSigningSupport_v2.patch, 
> PDFBOX-3065_viaExternalSigningSupport_v3.patch, 
> PDFBOX-3065_viaExternalSigningSupport_v4.patch
>
>
> Since to sign a PDF you forced the implementation of the SignatureInterface 
> interface, is not possible to prepare N hashes from N PDF files and then send 
> them to a signing service that accepts multiple hashes with a single signon.
> For example if I use an OTP signing service.
> What would be nice to have is to separate the hash calculation from the 
> signing. 
> Instead to implement the Interface I would like to have something like this:
> 1) calculate hash from document with the new signature dictionary bytes
> 2) sign the hash
> 3) insert the signature into pdf
> This way I could achieve to sign for example 100 pdf files calling the 
> service once.
> Right now must ask the user to sign in 100 times.
> Thanks in advance.
> Andrea.
>  



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