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https://issues.apache.org/jira/browse/PDFBOX-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15456425#comment-15456425
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Tilman Hausherr commented on PDFBOX-3065:
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{{saveIncrementalForExternalSigning}} describes it properly...
What I meant with "we can't change the API if we don't like it" is that the API
shouldn't change between versions e.g. 2.0.3 and 2.0.5, i.e. methods that exist
shouldn't be removed or renamed.
> 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: 2.1.0
>
> Attachments: PDFBOX-3065_viaExternalSigningSupport_v2.patch,
> PDFBOX-3065_viaExternalSigningSupport_v3.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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