HI, itextsharp uses the same nomenclature that C#, so: ExternalDigest is an
Interface and interface names start with "I". You should use
IExternalDigest and create your own, or use an existing one.
A simple CTRL+F: "ExternalDigest" would have solved your problem.
Regards,
Jose
El martes, 23 de octubre de 2012, Hyuga escribió:
> Hello everybody!
>
> I am trying to use iTextSharp to sign digitally a PDF previously created.
> I've upgraded my iTextSharp.dll version to 5.3.3.0 (I was previously using
> an elder version just for creating the PDFs), I have found the White Paper
> about Digital Signatures written by Mr. Lowagie and, of course, I've tried
> to apply what I've read there (written in Java) to what Im doing in VB.NET
> .
>
> But I'm doing something wrong, or I'm missing something, because the
> classes and their methods doesn't seem to be the same, and I'm not being
> able to find them in my downloaded dll.
>
> For example, the PdfStamper Class doesn't have a getSignatureAppearance()
> method, but I found the SignatureAppearance() one, which I think it does
> the same, so no problem. The PdfSignatureAppearance doesn't have the
> setReason or setLocation mtehods, but this is not my main problem.
> My first problem is when I try to get and ExternalDigest. In fact, I can't
> find neither the ExternalDigest class nor an equivalence in my dll version.
> And, if I can solve that, the signDetached method signature is not the same
> in Java than in VB.NET.
>
> After all this context (sorry if it's lengthly), my question is: can I use
> the concepts in the White Paper about Digital Signatures with iTextSharp
> version 5.3.3.0, or I have to downgrade my dll to try a previous approach
> to digitally sign my pdfs? If i can use the same concepts, where can I find
> the ExternaDigest class?
>
> Thanks a lot!
>
--
Saludos cordiales,
José Bonilla
(+593) 95031497
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