Hi,

> I would like to put a digital signature to an existing PDF document. In
all
> of the IText documentation I found a desctiprion about how to sign a PDF
and
> all of the ways use Bouncy Castle classes to encrypt the document hash.

few months ago i do something similar.
I've used :
bcmail
bcprov
bctsp
Bouncy Castle libraries.

Here you can find a useful example:
http://www.mail-archive.com/itext-questions@lists.sourceforge.net/msg40287.html

Hope this helps you
Regards
M
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