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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4477) Large encrypted file takes days to be parsed
Date Fri, 01 Mar 2019 08:31:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781457#comment-16781457
] 

Tilman Hausherr commented on PDFBOX-4477:
-----------------------------------------

But it is still there after the change. I found out one cause: decrypt() is called with COSInteger
and other objects that don't get decrypted. Getting rid of these puts the count at 824289.

> Large encrypted file takes days to be parsed
> --------------------------------------------
>
>                 Key: PDFBOX-4477
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4477
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Crypto, Parsing
>    Affects Versions: 2.0.14
>            Reporter: Tilman Hausherr
>            Priority: Major
>              Labels: optimization
>             Fix For: 2.0.15, 3.0.0 PDFBox
>
>
> As reported by [~slavago] in TIKA-2832. File is confidential but I have it. Initial
findings:
> - File is AES256 encrypted with empty user password
> - File has about 1000 objects
> - File is a tagged PDF
> - HashMap in SecurityHandler grows to 100000?!
> - Using an IdentityHashMap speeds up the process dramatically (parsed in a few seconds),
and it may also be a better solution that what was done in PDFBOX-4453
> Todo:
> - Read description of IdentityHashMap again
> - Find out why the HashMap grows so much. Could it be that identical objects are stored
twice? Or does the file have many direct objects?



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