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

["Andreas Lehmkühler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877130#action_12877130 ] 

Andreas Lehmkühler commented on PDFBOX-730:
-------------------------------------------

I've added your patch with version 953076. I've made some minor changes (ASF header, javadoc, small code additions)

Thanks to Adam for the contribution

> 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
>            Assignee: Andreas Lehmkühler
>             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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