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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4393) PDF signature invalid after second interactive field signed
Date Tue, 04 Dec 2018 12:03:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16708601#comment-16708601
] 

Tilman Hausherr commented on PDFBOX-4393:
-----------------------------------------

If I sign the original file twice with Adobe Reader then it works. Maybe because the first
signature adds the metadata...

IMHO it is an Adobe bug. Are you an Adobe client so that you have access to support?

> PDF signature invalid after second interactive field signed
> -----------------------------------------------------------
>
>                 Key: PDFBOX-4393
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4393
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Signing
>    Affects Versions: 2.0.12
>         Environment: Windows
>            Reporter: Martin Klíma
>            Priority: Major
>         Attachments: image-2018-12-04-11-14-01-586.png, image-2018-12-04-11-14-32-676.png,
streamserve_test_sig0.pdf, streamserve_test_sig0_saved.pdf, streamserve_test_sig0_saved_signed
by PDFBox.pdf, streamserve_test_sig0_saved_signed by PDFBox_then_signed by AR.pdf, streamserve_test_sig2.pdf,
streamserve_test_sig3.pdf, streamserve_test_sig3.signed.pdf
>
>
> Hi guys,
> I stumped on the problem with PDFBox and interactive field signing. I have PDF generated
with OpenText StreamServe with two interactive fields for signing. See example 1 (streamserve_test_sig0.pdf)
in attachement.
> When I use Adobe Reader I can sign both of the visual fields just fine but when I use
PDFBox to sign one of this field the following signature is marked as invalid. Doesn't matter
if I use PDFbox or sign it manually with Adobe Reader See example 3: 
>  *  streamserve_test_sig3.pdf (signed by PDFBox) - valid
>  *  streamserve_test_sig3.signed.pdf (signed 2nd by Adobe Reader) - invalid
> !image-2018-12-04-11-14-01-586.png|width=582,height=269!
>  
> Also last example - when it´s signed first by Adobe Reader and then with PDFBox the
signature seems valid but it says the document was "certified". See example 2 (streamserve_test_sig2.pdf)
> !image-2018-12-04-11-14-32-676.png|width=591,height=283!
>  
> What could be wrong? When is signed whole document with PDFBox it works just fine.
> Thanks for response,
> Martin
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