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https://issues.apache.org/jira/browse/PDFBOX-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318729#comment-15318729
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ASF subversion and git services commented on PDFBOX-3017:
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Commit 1747263 from [~tilman] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1747263 ]
PDFBOX-3017: enable verify
> Improve document signing
> ------------------------
>
> Key: PDFBOX-3017
> URL: https://issues.apache.org/jira/browse/PDFBOX-3017
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.0, 2.1.0
> Reporter: Tilman Hausherr
> Attachments: pdfa_signed_insivible.pdf
>
>
> Improve signing code:
> - incremental save only works for signatures and doesn't respect certificates
> such as Adobe Extended Usage Rights
> - -{{prepareNonVisualSignature}} clears the AcroForm DR
> {{acroForm.setDefaultResources(null)}} which is not good if there are other
> form fields-
> - visual/nonVisualSignature should move into the {{interactive.forms}}
> package and be handled within the signature field
> - verify signature (to have tests that go full circle)
> - document or refactor / rewrite visible labyrinthine signature code
> - why is it not possible to pass only the signatureField to addSignature,
> instead having to create a COSDocument with a page and annotations that has
> the signature field, and that must be searched for in
> {{prepareVisibleSignature()}}?
> - support rotated pages (see
> https://stackoverflow.com/questions/34012293/pdfbox-sign-landscape-file-error/34359956#34359956
> )
> - make sure that signed PDF/A files are still PDF/A (see
> http://www.pdfa.org/wp-content/uploads/2011/08/tn0006_digital_signatures_in_pdfa-1_2008-03-14.pdf
> ); /ID possibly not OK; /Annots is possibly required ([~tilman] removed this
> for invisible signatures); test signed files with PDF-Tools and with
> preflight; test whether "bad" signatures are detected by preflight
> - PDFBOX-3363 - why is the stream cached in a file? Should it be done in
> memory?
> - remove {{setVisualSignature(PDVisibleSigProperties
> visSignatureProperties)}} from SignatureOptions.java, all it does is to call
> {{visSignatureProperties.getVisibleSignature()}} which returns an
> {{InputStream}}, and this is already available
> - {{checkSignatureField}} violates the "do one thing" rule
> - ... your ideas...
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