BadPaddingException when decrypting with PDFBox

Question

In the past, I have tried to decrypt PDFs using PDFBox using the following code:

if (doc.isEncrypted()){
    doc.openProtection(new StandardDecryptionMaterial(password));
    doc.setAllSecurityToBeRemoved(true);
}

(Note that I don't use doc.decrypt(password) because the Javadoc for decrypt() says that openProtection() should be used instead, although why it's not just deprecated is beyond me).

Anyway, this has worked fine for quite a while. However, lately I seem to be getting the following exception:

java.io.IOException: javax.crypto.BadPaddingException: Given final block not properly padded
        at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:118)
        at javax.crypto.CipherInputStream.read(CipherInputStream.java:236)
        at javax.crypto.CipherInputStream.read(CipherInputStream.java:212)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:316)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptStream(SecurityHandler.java:421)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decrypt(SecurityHandler.java:390)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptObject(SecurityHandler.java:365)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.proceedDecryption(SecurityHandler.java:196)
        at org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler.decryptDocument(StandardSecurityHandler.java:158)
        at org.apache.pdfbox.pdmodel.PDDocument.openProtection(PDDocument.java:1598)
            <Stack trace continues with my call to openProtection()>

How can I fix this problem?

Thunderforge · Accepted Answer · 2014-11-17T03:04:11.607

1

This is a known issue, which appears to have been introduced as a result of a Java update. At the time of this writing, a fix for this is in review to be included in version 1.8.8, so just upgrade to version 1.8.8 or later and this problem will go away.

edited Nov 17 '14 at 03:04

answered Nov 17 '14 at 00:24

Thunderforge

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Yes we're working on this. Please try the 1.8.8 snapshot; if it doesn't work, please attach your file in the PDFBOX-2469 issue. https://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/pdfbox/1.8.8-SNAPSHOT/ – Tilman Hausherr Nov 17 '14 at 07:51
@Tilman I use the pdfbox-app version of the jar, but as far as I can tell, the snapshots only come in the unbundled form. Pity because I would be interested in trying it. – Thunderforge Nov 17 '14 at 14:35
Not sure what you mean - the snapshot pdfbox-app has the same as the released version. In some cases you may need jai_imageio and/or jbig2 in your classpath. – Tilman Hausherr Nov 17 '14 at 14:38
@Tilman, Ah, I understand now. The link you gave me was for plain pdfbox, but there also exists [a repository for pdfbox-app snapshots](http://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/pdfbox-app/1.8.8-SNAPSHOT/), which has what I need. I'll give it a try when I get a chance. – Thunderforge Nov 17 '14 at 16:29

BadPaddingException when decrypting with PDFBox

1 Answers1