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Date: Sat, 1 Nov 2014 06:59:34 +0000 (UTC)
From: "Tilman Hausherr (JIRA)" <jira@apache.org>
To: dev@pdfbox.apache.org
Message-ID: <JIRA.12752055.1414785534000.388992.1414825174021@Atlassian.JIRA>
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 <JIRA.12752055.1414785534596@arcas>
Subject: [jira] [Comment Edited] (PDFBOX-2471) AES encryption failing to
 write Acroform field names and values
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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 ] 

Tilman Hausherr edited comment on PDFBOX-2471 at 11/1/14 6:59 AM:
------------------------------------------------------------------

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:
- update to the current trunk (use a copy because there are rendering problems since last friday)
- 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)


was (Author: tilman):
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
>              Labels: AES256, AcroForm
>         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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