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https://issues.apache.org/jira/browse/PDFBOX-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192989#comment-14192989
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Tilman Hausherr commented on PDFBOX-2471:
-----------------------------------------
Yes we have a problem with AES256, which is apparently JDK related. This was
discovered while working on PDFBOX-2456. So you help is most welcome, if
successful. Your patch doesn't help on my local system, sadly. Please do this
whether it works for you:
- open the file org.apache.pdfbox.encryption.TestSymmetricKeyEncryption.java in
the tests
- in the source code replace "test.pdf" with "Acroform-PDFBOX-2333.pdf"
- in the source code, look for testProtection() and activate this segment that
is commented out
{code}
document = PDDocument.load(new
ByteArrayInputStream(inputFileAsByteArray));
testSymmEncrForKeySize(256, sizePriorToEncryption, document, PASSWORD,
permission1);
{code}
- run the test with your patch (and if this is my lucky day, improve your patch
:-) so that it passes the test)
> AES encryption failing to write Acroform field names and values
> ---------------------------------------------------------------
>
> Key: PDFBOX-2471
> URL: https://issues.apache.org/jira/browse/PDFBOX-2471
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, Writing
> Affects Versions: 2.0.0
> Reporter: Stephen Hendrix
> Attachments: PDFBOX-2471_Fix__AES_256_bit_encryption_of_COSString.diff
>
>
> When writing a PDF using AES 256 bit encryption, the field names / values
> from the Acroform are not being persisted correctly. If I encrypt using RC4
> 128 bit, they are persisted correctly. I am using snapshot
> pdfbox:2.0.0-20141023.180319-636.
> I dug into this, and it looks to me the problem is with
> COSWriter.visitFromString, which invokes SecurityHandler.decryptString
> (there is no SecurityHandler.encryptString).
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