https://bugs.freedesktop.org/show_bug.cgi?id=55425
Priority: medium
Bug ID: 55425
Assignee: [email protected]
Summary: PDF import: support encryption algorithm value 4
Severity: normal
Classification: Unclassified
OS: All
Reporter: [email protected]
Hardware: All
Status: UNCONFIRMED
Version: 3.7.0.0.alpha0+ Master
Component: filters and storage
Product: LibreOffice
For example, the .pdf file attached to
<https://bugzilla.redhat.com/show_bug.cgi?id=826526> "cannot import pdf 1-5
format with encrypted sections in otherwise unprotected document" (as
<https://bugzilla.redhat.com/attachment.cgi?id=587716>) contains an Encrypt
dictionary of
10747 0 obj
<< /Length 128
/CF << /StdCF << /Length 16
/AuthEvent /DocOpen
/CFM /AESV2 >> >>
/Filter /Standard
/O (...binary...)
/P -1052
/R 4
/U (...binary...)
/V 4
/StrF /StdCF
/StmF /StdCF >>
endobj
whose V entry 4 specifies an en-/decryption algorithm that makes use of the CF,
StmF, and StrF entries. This was introduced with PDF 1.5 (for reference, see
Table 20 "Entries common to all encryption dictionaries" in section 7.6.1 of
<http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/PDF32000_2008.pdf>
"Document management — Portable document format — Part 1: PDF 1.7").
But our import code currently only supports older algorithm values 1 and 2 (cf.
"m_pData->m_nAlgoVersion > 2" in PDFFile::setupDecryptionData at
<http://cgit.freedesktop.org/libreoffice/core/tree/sdext/source/pdfimport/pdfparse/pdfentries.cxx?id=eecaca80bdcf9060a5dd06a835a2c1752b4fec01#n1235>).
The resulting effect is that LO keeps asking for a password to open the
document (bAuthenticated can never become true in the loop in checkEncryption
at
<http://cgit.freedesktop.org/libreoffice/core/tree/sdext/source/pdfimport/wrapper/wrapper.cxx?id=eecaca80bdcf9060a5dd06a835a2c1752b4fec01#n944>).
So, it would be nice if we also supported algorithm value 4.
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