Michele Balistreri created PDFBOX-2268:
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Summary: AES-256 decryptions fails
Key: PDFBOX-2268
URL: https://issues.apache.org/jira/browse/PDFBOX-2268
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 2.0.0
Reporter: Michele Balistreri
When opening a document encrypted with AES-256 (owner password only) by
providing no password, the isUserPasswordMethod fails, since it tries to
decrypt a null pointer.
Also, the code validating the Perms dictionary is correct, but unfortunately
not even Acrobat seems to write Perms correctly (in my case P = F0C0 and Perms
= F2C0), so that check needs to be relaxed. Perhaps logging the issue instead
of throwing an exception would be more adequate.
Provided is a patch for both issues. I understand it is probably suboptimal but
I am completely new to the project and have not yet had the time to study all
coding conventions. Considering the patch is very small maybe someone can take
it as a pointer of what needs to be changes.
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