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https://issues.apache.org/jira/browse/COMPRESS-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783138#action_12783138
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Antoni Mylka commented on COMPRESS-89:
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I use a modified version of commons-compress, with this patch. It's used within
the Aperture Framework (aperture.sf.net) to detect encrypted ZIP files and mark
them as encrypted. It seems to work pretty well.
If you don't like this or think something is wrong with this - please let me
know. All kinds of feedback welcome.
> Better support for encrypted ZIP files
> --------------------------------------
>
> Key: COMPRESS-89
> URL: https://issues.apache.org/jira/browse/COMPRESS-89
> Project: Commons Compress
> Issue Type: Improvement
> Affects Versions: 1.0, 1.1
> Reporter: Antoni Mylka
> Attachments: apache-maven-2.2.1-encrypted-passhello.zip,
> commons-compress-encrypted.patch
>
>
> Currently when the ZipArchiveInputStream or ZipFile encounters an encrypted
> zip it bails out with cryptic exceptions like: 'invalid block type'. I would
> like to have two things:
> 1. an 'encrypted' flag in the ZipArchiveEntry class. It would be taken from
> the first bit of the 'general purpose flag'
> 2. more descriptive error messages, both in ZipFile and ZipArchiveInputStream
> It might be useful in case someone wants to implement proper support for
> encrypted zips, with methods to supply passwords/encryption keys and proper
> encryption/decryption algorithms.
> For the time being I just need to know if a file is encrypted or not.
> I will post a patch with a proposal of a solution in near future.
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