Yes, Podofo supports the pdf 1.7 version of AES256 (-> extension level
3), when libidn is available. We use this already.
But an AES256 encryption with 'Version 5' should refer to pdf 2.0 (or
pdf 1.7 extension level 8). It's essentially a new, more secure AES256
encryption implementation. Podofo does not support that as of now.
Am 29.10.2021 um 13:35 schrieb Francesco Pretto:
Support should already be present in PoDoFo but you must add support
for Libidn[1]. As far as I remember only Libidn 1.x is supported in
PoDoFo because Libidn 2.x is API incompatible.
[1] https://www.gnu.org/software/libidn/
On Fri, 29 Oct 2021 at 13:24, F. E. <exler7...@gmail.com> wrote:
Hello dear podofo users,
I have a password protected pdf file (Pwd: test), which podofo
fails to load:
ePdfError_UnsupportedFilter: Unable to load objects from file.: Error while
loading object 8 0
Unsupported encryption method Version=5 Revision=6
I checked in the pdf reference 1.7, and there was indeed no
Version 5 or Revision 6 listed.
After some more digging I found out, that the pdf should follow
the pdf 2.0 standard (iso 32000-2), which features a more secure
AES 256 encryption.
My question now is, is anyone familiar with this kind of
encryption, and would it be theoretically possible to add it to
podofo (if anyone had the time for it ...) ?
Greetiings,
F.E.
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