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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PDFBOX-3114) Visible signatures in different pages
Date Thu, 10 Dec 2015 20:41:11 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tilman Hausherr updated PDFBOX-3114:
    Attachment: test1_signedinvisible_p2.pdf

Could you do me another favor? Please sign an invisible signature on the attached file (test1_signedinvisible_p2.pdf)
on page 1 with Acrobat.

With PDFBox, invisible signatures are also attached to a page. I don't know how acrobat does
it. The new file should have less changes, so hopefully it should be easier to find some clue
what's wrong.

I did find out something today, the error does not happen if the (invisible) annotation on
the page of the second signature is omitted. From my understanding of the spec, the (invisible)
annotation is not needed for invisible signatures at all. But of course it is needed for visible

To me, this (and the viewer error msg "one page was modified") suggests that Adobe Reader
believes that one page of the (signed) file was modified, but I haven't found out why.

> Visible signatures in different pages
> -------------------------------------
>                 Key: PDFBOX-3114
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3114
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Signing
>    Affects Versions: 2.0.0
>         Environment: Compiled with jdk1.8.0_60, tested with Adobe Acrobat XI Pro v.11.0.13
>            Reporter: Luca Battistelli
>            Priority: Blocker
>         Attachments: pdfbox-2.0.0-RC1_issue.zip, test1_signedinvisible_p2.pdf, test_Acrobat_iText.zip
> I tried to make two visible signatures in a 2-pages pdf file using pdfbox-2.0.0-RC1.
> I followed the example in SVN directory
> https://svn.apache.org/viewvc/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/signature/
> I have just modified CreateVisibleSignature class customizing the input parameters and
the page to sign.
> If both the signatures are made in the same page, no error occurs. If signatures are
made in different pages (e.g. signature 1 in page 1 and signature 2 in page 2), when I open
the pdf file with Adobe Acrobat XI Pro (v.11.0.13) it tells that signature 1 is not valid.
> The attachment below refers to the source/resourse zip file. It contains:
> - test.docx: 2-pages test document generated with Microsoft Office Professional Plus
> - test1.pdf: pdf version that generates error (created with Word by selecting "Save as
Adobe PDF" option)
> - test1_*.pdf: signed pdf files with error
> - test2.pdf: pdf version that generates no error (created with Word by selecting "Save
as" option and then "*.PDF")
> - test2_*.pdf: signed pdf files with no error
> - CreateVisibleSignature.java: customized source code 
> - stamp.png: signature image
> - test.p12: key store (password 12345)

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