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https://issues.apache.org/jira/browse/PDFBOX-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038478#comment-15038478
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Tilman Hausherr commented on PDFBOX-3149:
-----------------------------------------
[~jesselong] I committed your patch with one small modification that I thought
about at the last minute - you skip the empty imput when encrypting, but we
shouldn't do that, to avoid errors with other PDF readers that have the same
problem as the one you fixed.
> Failure to decrypt empty strings (AES 128)
> ------------------------------------------
>
> Key: PDFBOX-3149
> URL: https://issues.apache.org/jira/browse/PDFBOX-3149
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto, Parsing, PDModel
> Affects Versions: 2.0.0
> Reporter: Jesse Long
> Assignee: Tilman Hausherr
> Priority: Minor
> Attachments: PDFBOX-3149.patch
>
>
> SecurityHandler fails to decrypt empty strings in a AES 128 encrypted PDF.
> Strings like: <</Name ()>>
> This is because it tries to read the first 16 bytes as the AES IV, failing
> which it throws IOException. Solution: if you cannot read any bytes from the
> stream, it is empty and so there is nothing to decrypt.
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