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From "Tilman Hausherr (Jira)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4702) signature verification in Adobe products
Date Mon, 02 Dec 2019 17:37:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986217#comment-16986217

Tilman Hausherr commented on PDFBOX-4702:

Dictionaries do now know their parent(s). You could still find it by going through the whole
PDF and then spidering the structures, and using getItem() instead of getDictionaryItem().
If you get a COSObject, then there is an indirect object below. However... it gets more complex
when saving, because COSWriter makes some optimizations (some structures are always indirect)
/ has some exceptions.

> signature verification in Adobe products
> ----------------------------------------
>                 Key: PDFBOX-4702
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4702
>             Project: PDFBox
>          Issue Type: Improvement
>            Reporter: Jason Pyeron
>            Priority: Major
>         Attachments: image-2019-12-01-17-33-28-155.png, image-2019-12-02-06-31-12-527.png,
pdfbox-4702-signed-Adobe.pdf, pdfbox-4702-signed-PDFBOX-Tilman.pdf, pdfbox-4702-signed-PDFBOX.pdf,
pdfbox-4702-unsigned.pdf, pdfbox-4702.pdf, screenshot-1.png
> Signatures with appearances have some unknown validation, that is resulting in "Bad parameter"
error when validating. 
> See mailing list thread: https://lists.apache.org/thread.html/dde2f9531be0126402251b9fa95bd2274c1162fe5806420cbe1ca9ee@%3Cdev.pdfbox.apache.org%3E

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