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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #25 from Adrian Johnson <ajohnson at redneon.com> ---
Created attachment 134030
  --> https://bugs.freedesktop.org/attachment.cgi?id=134030&action=edit
write document then update byte offsets and sig on disk

This updates to signing to work the way I requested. ie
- write the PDF to disk with space reserved in the ByteOffsets
- read the PDF back into a new PDFDoc
- get the offset of the signature object from the XRef
- update the byte offsets on disk
- compute the hash from the disk data and update the signature on disk

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