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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4413) Add support for AES256 encryption for public key
Date Sat, 22 Dec 2018 21:01:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727569#comment-16727569

Tilman Hausherr commented on PDFBOX-4413:

The main differences are that the recipients must go into the crypt filter dictionary when
the subfilter adbe.pkcs7.s5 is used (I couldn't get it to run with the adbe.pkcs7.s4 subfilter,
and a working file I created with another software used adbe.pkcs7.s5), and that the standard
crypt filter is now named /{color:#333333}DefaultCryptFilter{color} for public key encryption
instead of /StdCF symmetric encryption.

> Add support for AES256 encryption for public key
> ------------------------------------------------
>                 Key: PDFBOX-4413
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4413
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Crypto
>    Affects Versions: 2.0.13
>            Reporter: Tilman Hausherr
>            Priority: Major
> Adobe 9 added support for AES 256 encryption. This should also be implemented for public
key encryption, currently it is only implemented for symmetric key encryption.
> Further information is available at [http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf].
> I suspect that much of it is already available in the base class, but PublicKeySecurityHandler.prepareDocumentForEncryption()
is definitively old stuff.

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