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Comparing signed and unsigned PDFs

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A component to monitor and control Windows registry access and create virtual registry keys.
#27587
Posted: 12/06/2013 04:11:41
by Stephane Grobety (Priority Standard support level)
Joined: 04/18/2006
Posts: 170

Hello,

I have a need to verify is two PDF documents are actually the same document but one with a digital signature.

How could I go about doing that with PDFBlackBox (in Delphi 6).

Subsidiary question: if the same document is signed twice, each time by a different person and independently, resulting in two different files, is there a way to merge these two signatures into the same PDF file ?

Thank you
#27588
Posted: 12/06/2013 04:17:50
by Vsevolod Ievgiienko (EldoS Corp.)

Thank you for contacting us.

Quote
I have a need to verify is two PDF documents are actually the same document but one with a digital signature.

How could I go about doing that with PDFBlackBox (in Delphi 6).

You can extract the original document using TElPDFDocument.Signatures[N].GetSignedVersion method and compare it to the unsigned version. They should be equal for the same documents.

Quote
Subsidiary question: if the same document is signed twice, each time by a different person and independently, resulting in two different files, is there a way to merge these two signatures into the same PDF file ?

There is no way to merge two signed files.

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