[Libreoffice-bugs] [Bug 50400] PDF export: Warn that password field does not accept Unicode characters other than ASCII (see Comment 6)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=50400

Timur <gtimur at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|PDF: When exporting to PDF, |PDF export: Warn that
                   |the password field does not |password field does not
                   |accept Unicode characters.  |accept Unicode characters
                   |                            |other than ASCII (see
                   |                            |Comment 6)

--- Comment #6 from Timur <gtimur at gmail.com> ---
https://bugs.documentfoundation.org/show_bug.cgi?id=70183#c12
Mike Kaganski 2017-07-08 18:54:42 UTC

The relevant information from Adobe is here:
https://forums.adobe.com/thread/831473
https://forums.adobe.com/thread/489152

So, the algorithm used by LibreOffice could in theory allow using any
characters, but they would need to be converted to system 8-bit codepage
(different for Win and Mac) before using for encryption. Thus, a PDF encrypted
with non-ASCII characters would be ~impossible to open on any system with
different system locale. Thus, using the ASCII restriction is a good choice.

I tested that encoding the password as utf-8 makes the PDF unopenablw using
Adobe Acrobat Reader DC 2017.

The problem here remains only to make this user-visible and documented.
As the easiest solution for those who would like to implement this (as an
easyhack), I'd propose to add to the SfxPasswordDialog a (yellow?) label saying
something like "Only English letters, numbers other ASCII characters", which
were hidden by default, and were made visible in the
SfxPasswordDialog::AllowAsciiOnly().

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