[jira] [Commented] (PDFBOX-4453) Encrypted string not decrypted

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758612#comment-16758612 ] 

Tilman Hausherr commented on PDFBOX-4453:
-----------------------------------------

The problem is that there is another encrypted "0" in the file. Consider this code:
{code}
final Set<COSBase> objects = new HashSet<>();
objects.add(new COSString("0"));
objects.add(new COSString("0"));
System.out.println("size: " + objects.size());
{code}
It outputs
{noformat}
size: 1
{noformat}
So PDFBox believes that it has already decrypted that element but it hasn't. The encryption key is different for each object, so two encrypted identical elements are usually not the same.

> Encrypted string not decrypted
> ------------------------------
>
>                 Key: PDFBOX-4453
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4453
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Crypto
>    Affects Versions: 2.0.13
>            Reporter: Tilman Hausherr
>            Priority: Major
>         Attachments: 2AF-0088-NA-LMF35-40-01-2019-01-18-14-25-52(1).pdf
>
>
> In the attached file, an ancrypted string "0" should be decrypted to "3" but it is not.
>  * It is RC4 40 bit enrcyption
>  * The string is not decrypted because it is skipped because it is in the objects HashSet



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