Hi Randolph,
you need to create a AcroForm object. The signature field has to be
one of the form fields then. This is not the case in your Test-PDF.
You can use the PdfAcroForm for this.
PdfAcroForm acroForm = aWriter.getAcroForm();
and
PdfFormField.createSignature(PdfWriter writer);
With the standard implementation of iText you can generate
a hidden signature (x,y,dx,dy all 0).
But to create a visible signature you'll have to do a lot more.
I didn't manage to do it (luckily it wasn't a requirement in my case).
There is documentation at the Adobe Website. Look for:
- 'Digital Signature Appearances' (covers mostly Acrobat 6) or
- 'PDF Public-Key Digital Signature and Encryption Specification' (Acrobat
5 compatible)
You'll need to create different layers of so called appearances.
Regards,
Peter
> hello leonard!
>
> On Mon, 14 Jun 2004, Leonard Rosenthol wrote:
> > There is no digital signature in that file.
> > What makes you think there shoudl be?
> because i added it to the file:
>
> <</Filter /Adobe.PPKLite
> /M (D:20040608212045)
> /Name (10.10.10.200)
> /ByteRange [0 16243 18332 645]
> /Type /Sig
> /Contents <...the signature...>
> /SubFilter /adbe.pkcs7.detached
> >>
>
> but this doesn't work, though the byte-rande should be correct as well as
> the signature itself. yet it does not show in acrobat. so i am wondering
> if the format is incorrect or if i have forgotten something.
>
> regards
>
> randolph
>
>
>
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