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https://issues.apache.org/jira/browse/PDFBOX-1594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manuel Kasper updated PDFBOX-1594:
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Attachment: pdfbox-1.8.4-aes256.diff
Here is a patch against PDFBox 1.8.4 that implements AES-256 encryption and
decryption. This is the PDF 1.7 AEL 8 / PDF 2.0 / ISO 32000-2 version
(V=5/R=6). To use it on the command line, simply specify {{-keyLength 256}}
when encrypting.
The JCE Unlimited Strength Jurisdiction Policy Files must be installed for
AES-256 to be available.
The patch also fixes a bug where PDFBox used a zero-length owner password if
only a user password was given during encryption (instead of using the same
string as the user and owner password), thereby rendering the encryption
practically useless.
Also, the order in which a given password is tested during decryption has been
changed to (owner, user) instead of (user, owner). This makes it possible to
decrypt files that only have a user password – otherwise this would fail as
PDFBox would treat the given password as the user password and not apply the
owner permissions.
Note: this patch is only for password-based, not public key based encryption.
> Add support for AES256 Encryption
> ----------------------------------
>
> Key: PDFBOX-1594
> URL: https://issues.apache.org/jira/browse/PDFBOX-1594
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Reporter: Maruan Sahyoun
> Fix For: 2.0.0
>
> Attachments: pdfbox-1.8.4-aes256.diff
>
>
> Adobe 9 added support for AES 256 encryption. Further information is
> available at
> http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf
> (specially 3.5.1) or ISO 32000-2.
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