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https://issues.apache.org/jira/browse/PDFBOX-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15467125#comment-15467125
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Petras commented on PDFBOX-3065:
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Exactly. I wanted to expose only those methods, while {{close()}} method would
be a kind of internal, though probably there would be no harm to make it
external. But I wanted PDDocument to be responsible for closing it, not the
client. Besides, initially I tried to move a lot more logic to
{{SigningSupport}} (to wrap SignatureInterface and COSWriter would deal with
{{SigningSupport}} with any type of signing scenarios), but the code then
turned a bit too complicated for just introducing the external signing feature
implementation, therefore for now I dropped this idea.
> 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
> Labels: features
> Fix For: 2.0.3, 2.1.0
>
> Attachments: 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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