Encrypted Key not correctly calculated when the meta data is not encrypted
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Key: PDFBOX-907
URL: https://issues.apache.org/jira/browse/PDFBOX-907
Project: PDFBox
Issue Type: Bug
Components: Parsing
Affects Versions: 1.3.1
Reporter: Martijn Brinkers
Since rev 4, meta data can be unencrypted while the data is encrypted. If the
metadata is not encrypted 0xFFFFFFFF should be added to the hash:
"Security handlers of revision 4 or greater) If document metadata is not being
encrypted, pass 4 bytes with
the value 0xFFFFFFFF to the MD5 hash function."
(see see 7.6.3.3 Algorithm 2 Step f of PDF 32000-1:2008)
Whether or not the metadata is encrypted is store in the encryption dictionary.
The default value is to encrypt the meta data.
I will attach a patch to detect whether the meta data is encrypted, and if not
0xFFFFFFFF will be added.
The document that I have tested with can be downloaded from
http://www.mbtareview.com/MBTA_Review_2009.pdf
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