[jira] [Commented] (PDFBOX-3889) javax.crypto.BadPaddingException: Given final block not properly padded

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

    [ https://issues.apache.org/jira/browse/PDFBOX-3889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118858#comment-16118858 ] 

Tilman Hausherr commented on PDFBOX-3889:
-----------------------------------------

I am able to open that file with 2.0.7, or with 1.8.13 when using loadNonSeq. Please try that.

> javax.crypto.BadPaddingException: Given final block not properly padded
> -----------------------------------------------------------------------
>
>                 Key: PDFBOX-3889
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3889
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Crypto
>    Affects Versions: 1.8.13
>         Environment: Java 1.8.  Pdfbox 1.8.13  Windows and Linux
>            Reporter: Lucille Wilson
>              Labels: security
>         Attachments: 14-03-1159.pdf
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Using the attached pdf, When running the pdf through org.apache.pdfbox.pdmodel.encryption.SecurityHandler I get 
> BadPaddingException.
> The exception occurs when it is processing 
> nextObj = COSObject{3304,0} I see: nextCOSBase = COSDictionary{(COSName{Length}:COSInt{3504}) (COSName{Subtype}:COSName{XML}) (COSName{Type}:COSName{Metadata}) } 
> The problem is that SecurityHandler.proceedDecryption() runs  decryptObject(nextObj);
>  and then decrypt(base, objNum, genNum) and then decryptStream()
> However for this object decryptStream doesn't actually decrypt anything because the type is xml.  
> So when decryptStream calls encryptData() encryptData() throws the bad packet exception.
>  output.write(decryptCipher.doFinal()); throws the exception because the data buffer is all zeros.  It has nothing in it.  I recommend that encryption be skipped if the data buffer has all zeros.



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