Lucille Wilson created PDFBOX-3889:
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Summary: 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
Fix For: 1.8.13
Attachments: 14-03-1159.pdf
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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