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From: "Tilman Hausherr (JIRA)" <jira@apache.org>
To: dev@pdfbox.apache.org
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Subject: [jira] [Comment Edited] (PDFBOX-3149) Failure to decrypt empty
 strings (AES 128)
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    [ https://issues.apache.org/jira/browse/PDFBOX-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036657#comment-15036657 ] 

Tilman Hausherr edited comment on PDFBOX-3149 at 12/2/15 9:22 PM:
------------------------------------------------------------------

encrypted file with an empty string in object 7, password is abcdefghijk1234567890abcdefghijk1234567890, and it can be opened with PDFDebugger without any trouble.


was (Author: tilman):
encrypted file with an empty string in object 7, password is abcdefghijk1234567890abcdefghijk1234567890

> 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, Simple-128-bit-encrypted.pdf
>
>
> 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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