[Libreoffice] [PATCH/REVIEW-3-4] Backport reading AES-encrypted ODF 1.2 documents (as genereated by LibO 3.5)

[Stephan Bergmann]

With LO 3.5 by default using (new in ODF 1.2) AES encryption for 
password-protected documents (instead of Blowfish as used in older 
versions), people still using LO 3.4 would be unable to open such 
documents.  (And what's really ugly, all they would get is an 
incomprehensible error box "Format error discovered in the file in 
sub-document styles.xml at 1,0 (row,col).")

<http://pkgs.fedoraproject.org/gitweb/?p=libreoffice.git;a=blob;f=Backport-reading-AES-encrypted-ODF-1.2-documents.patch;h=e6c722598ab05464f09787355b621cbb0aa07c49;hb=e7a803540d408adab3d55fb2ae051ac4be599a72> 
is a patch (actually, four separate patches for the components, 
lib-core, lib-gui, and ure repos) to backport support for reading (but 
not writing) AES-encrypted ODF 1.2 documents to libreoffice-3-4.  It is 
effectively all of CWS mav60 plus one additional typo fix, minus the 
writing support from mav60, and as such is quite large.

An alternative might be to cherry-pick the relevant commits from master 
into libreoffice-3-4, but that would have the drawback that it would 
cause later LO 3.4.y to write password-protected ODF documents using AES 
which earlier LO 3.4.x could no longer open---something that might not 
be desirable for a micro update.  Plus, the number of commits that would 
need to be picked would be quite large, too (the individual commits of 
mav60 are quite intertwined).

If people are happy with the linked patch: fine.  If people would prefer 
a cherry-picking approach, I could post a list of relevant commits 
(technically, I produced the patch in a different way, more or less 
applying mav60 to libreoffice-3-4 directly, so do not have that list 
handy).  (And if there are objections against including this in the 3.4 
code line at all, that would of course be fine as well.)

Stephan