I am trying to use USPS Electornical Post Mark (EPM) to digitally sign my PDF file.
I am following the posted example http://itextpdf.sourceforge.net/howtosign.html#howtosing example: How to sign with external signature dictionary (DSE200 example) Unfortunately, there is very little information (in the iText book or the API) on "why" and "what" is being done here. Specifically, I am currently crashing (null pointer exception) on a call PdfSignatureApperarance sap. sap.preClose() - which apparently calls sap.getAppearance(), but because in this case one does not call sap.setCrypto(key, chain, null, appearance), something in the appearance (i.e. signer information) is missing. Similarly, I am a bit lost on the whole mechanism used in this case - setting multiple dictionaries and hashes. Is there someone who has done a similar "project" and can point me to more information on this subject? Martin Brunecky Software Architect RecordFusion <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] AIM: mbrunecky tel: fax: <http://www.plaxo.com/click_to_call?src=jj_signature&To=303-865-8847+x+225&E [EMAIL PROTECTED]> 303-865-8847 x 225 303-865-8846 <https://www.plaxo.com/add_me?u=38655967504&v0=2505222&k0=891308811> Add me to your address book... <http://www.plaxo.com/signature> Want a signature like this?
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