Well, if the DigestValue isn't changing, then it definitely isn't doing what
you want.
My best guess is that the information you want is embedded in the value of the
V Contents. This value is about 17 kB in size, and looks like it contains a
lot of interesting stuff. However, I think it may
i grepped through some other signed PDFs created from within Adobe
Acrobat, signed with differing CA certs and timestamp servers and
DigestAlgos - they all report the same md5 DigestValue...(?)
disappointingly, tests with LibreOffice Writer signed/timestamped PDFs
did not display a DigestValue.
I got the sample, thanks.
Using "exiftool -v" on this file, I see a signed annotation with the
information below.
The signature time is given by M. It could be that the digest is given by
DigestValue, but this is an MD5 digest, not sha256.
It would be tricky to extract this information in a
Do you have a sample you can provide where you know the timestamp and hash/algo?
If so, please send it to me (phil at owl.phy.queensu.ca)
- Phil
Package: libimage-exiftool-perl
Version: 10.10-1
Severity: wishlist
would love to see this
extract timestamp hash/algo of signed+timestamped PDF
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