[Poppler-bugs] [Bug 99416] Sign PDF with digital signature

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99416

--- Comment #46 from Hans-Ulrich Jüttner <huj at froreich-bioscientia.de> ---
(In reply to Adrian Johnson from comment #44)
> (In reply to Albert Astals Cid from comment #43)
> > This is what needs to happen, be it reread or ideally a less extensive
> > operation, but after sign is called, things need to keep returning valid
> > information.
> 
> It is probably sufficient to just update the signature and byte offsets in
> the in memory object.

With the Contents object I see no problem replacing it with the correct
signature
value. However, the ByteRange object on disk is a string with multiple spaces,
e.g. "/ByteRange [0 103562     108976     311        ]". These multiple spaces
can't be represented in the ByteRange object in memory as it is an array of
integers. But if these multiple spaces are removed the signature will be
invalidated since the hash is calculated over a string including these spaces.
Before the patch (3) of Adrian this problem was avoided by not producing such
multiple spaces.

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