[jira] Updated: (PDFBOX-730) Basic implementation of Crypt filter

["Adam Nichols (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Nichols updated PDFBOX-730:
--------------------------------

    Attachment: PDFBOX-730.patch
                IdentityFilter.java
                CryptFilter.java

Patch which implements the default Crypt filter.  It's not a complete solution, but it's better than nothing and it fixes all the PDFs I've come in contact with.  This code will be easy to expand as needed.

> Basic implementation of Crypt filter
> ------------------------------------
>
>                 Key: PDFBOX-730
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-730
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: Utilities
>         Environment: Windows Vista 32-bit, Java 1.5.0_06, PDFBox HEAD tag
>            Reporter: Adam Nichols
>             Fix For: 1.2.0
>
>         Attachments: CryptFilter.java, IdentityFilter.java, PDFBOX-730.patch
>
>
> I got an exception when trying to merge some documents which read "Unknown stream filter:COSName{Crypt}".  I've looked around and it found this is a feature which was introduced in version 1.5 of the PDF spec.  PDFBox doesn't have this filter implemented yet.  This should be implemented per section 7.6.5 "Crypt Filters" of the PDF Specification (for reference, I'm looking at version 1.7 of the spec).
> I only have one example PDF which requires this filter and it uses the default encryption (Identity), so this will be the only type of Crypt filter which will be implemented for now.  Since I don't have an example which has a filter "Name", I will only be implementing the case where the default is used as I have no test case for Name==Identity.  If the "Name" is specified, it will throw an exception (currently it throws an exception for any Crypt filter).

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