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https://issues.apache.org/jira/browse/PDFBOX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727569#comment-16727569
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Tilman Hausherr edited comment on PDFBOX-4413 at 12/23/18 10:31 AM:
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The main differences are that SHA-256 is to be used instead of SHA-1, 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 for symmetric encryption.
I also improved the test so that it looks at the contents too. (Not doing it
prevented the testing of the actual decryption).
was (Author: tilman):
The main differences are that SHA-256 is to be used instead of SHA-1, 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.
I also improved the test so that it looks at the contents too. (Not doing it
prevented the testing of the actual decryption).
> 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
> Labels: AES256
> Fix For: 2.0.14, 3.0.0 PDFBox
>
>
> 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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