[PDFBOX-2347] NPE while creating security handler for decryption

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.6, 1.8.7, 2.0.0
• Fix Version/s: 1.8.7, 2.0.0
• Component/s: Parsing
• Labels: Encryption
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 14/Sep/14 18:48
• Updated: 19/Sep/14 14:40
• Resolved: 14/Sep/14 22:19

Description

The attached file has a NPE with the non sequential parser only:

Exception in thread "main" java.io.IOException: Error (NullPointerException) while creating security handler for decryption
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.initialParse(NonSe
quentialPDFParser.java:493)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.parse(NonSequentialPDFParser.java:794)
        at org.apache.pdfbox.pdmodel.PDDocument.loadNonSeq(PDDocument.java:1156)

        at org.apache.pdfbox.pdmodel.PDDocument.loadNonSeq(PDDocument.java:1139)

        at org.apache.pdfbox.tools.PDFToImage.main(PDFToImage.java:197)
        at org.apache.pdfbox.tools.PDFBox.main(PDFBox.java:89)
Caused by: java.lang.NullPointerException
        at org.apache.pdfbox.pdmodel.encryption.PDEncryption.getFilter(PDEncrypt
ion.java:159)
        at org.apache.pdfbox.pdmodel.encryption.PDEncryption.<init>(PDEncryption.java:96)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.initialParse(NonSe
quentialPDFParser.java:464)

The file has this:

trailer
<<
/Size
53
/Info
29 0 R
/Encrypt
null
/Root
35 0 R
/Prev
256729
/ID
[
<f571e5c0c658cb76cfe7ad0662f8f6a1>
<1c11ae9224c83622f7682d9e00bd2581>
]
>>

so the encryption item is COSNull which is not the same as "null" when using getItem(). So the solution is to use getDictionaryObject() instead, because it checks for COSNull. This method is already used elsewhere in PDFBox to get /Encrypt.