You must sign your pdf the first time with your signature. See
http://itextpdf.sourceforge.net/howtosign.html for some examples.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Juan Jose Rider Jimenez
> Sent: Friday, November 16, 2007 2:03 PM
> To: Post all your questions about iText here
> Subject: [iText-questions] Recalculating Signature in an
> already signed PD
>
> Could you help me with this?
> I have an smartcard to sign SHA1 hashes and I would like to
> use this with
> iText for signing PDF documents.
> So, I do the following:
>
> 1)Create PDF doc
> 2)Sign PDF doc
> Using a keystore as it is showed in examples.
> 3)Try to recalculate hash SHA1. (How)?
> 4)Send the hash to smartcard and get to signature value
> 5)Update PDF signature with new Signature value(and X509
> certificate, of
> course!)
>
> Problems are in steps 3 and 5.
>
> Could you help me?
>
> Thanks in advance
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