I had a quick look... yes the document info is unencrypted which is
incorrect. EncryptMeta is false but this applies only to XMP metadata
streams.
Tilman
Am 24.04.2018 um 12:48 schrieb Evert-Jan de Bruin:
Hello,
For my project I have to merge PDF files together. This usually works
fine, but it does not always work with digitally signed PDF files.
Simply a load() of the document will already fail with
InvalidBlockSizeException. Here is an example document:
https://ufile.io/mgshz
I went into the PDFBox code, and the issue seems to be that it detects
AES encryption in the PDF due to the digital signature, but then
assumes everything is encrypted and needs to be decrypted. However,
the headers are **not** encrypted so decryption fails.
I can get it all to work by going to PDFParser.java and disabling
these three lines in prepareDecryption():
// securityHandler = encryption.getSecurityHandler();
// securityHandler.prepareForDecryption(encryption,
document.getDocumentID(),
// decryptionMaterial);
// accessPermission = securityHandler.getCurrentAccessPermission();
However, this is of course very ugly as decryption is now totally
disabled. I also get warnings about offset issues but the end result
seems fine.
Is there a more elegant solution or is this really a bug?
It seems to be a repetition of
https://issues.apache.org/jira/browse/PDFBOX-3229
<https://issues.apache.org/jira/browse/PDFBOX-3229> but this should
have been fixed in 2.0.0, however, it still occurs in 2.0.9
Regards,
Evert-Jan de Bruin
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