evince cannot open pdf with AESV3 256 encryption

[Christopher Hill]

When opening a file with AESV3 256 encryption evince repeatedly prompts for a password interactively and fails to render the document.

To recreate:

1. Encrypt a PDF with qpdf:

$ qpdf --version
qpdf version 4.2.0
Copyright (c) 2005-2013 Jay Berkenbilt
This software may be distributed under the terms of version 2 of the
Artistic License which may be found in the source distribution. It is
provided "as is" without express or implied warranty.
$ qpdf --encrypt "wibble" "wobble" 256 -- plain.pdf encrypted.pdf
$ egrep -a AES encrypted.pdf
<< /CF << /StdCF << /AuthEvent /DocOpen /CFM /AESV3 /Length 32 >> >> /Filter /Standard /Length 256 ...

2. Check it opens with Adobe Acrobat

3. Attempt to open with evince:

$ evince --version
GNOME Document Viewer 3.10.0
$ evince encrypted.pdf

(evince:17902): EvinceDocument-CRITICAL **: ev_document_get_n_pages: assertion 'EV_IS_DOCUMENT (document)' failed
Syntax Error: Invalid encryption key length
Command Line Error: Incorrect password
Syntax Error: Invalid encryption key length
Command Line Error: Incorrect password

(evince:17902): Gtk-CRITICAL **: gtk_widget_get_toplevel: assertion 'GTK_IS_WIDGET (widget)' failed

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Christopher Hill (ch6574)]

Filed: https://bugzilla.gnome.org/show_bug.cgi?id=726598

[Sebastien Bacher (seb128)]

Thanks