Thanks Paulo for answering so fast...

Paulo Soares escribió:
See http://itextpdf.sourceforge.net/howtosign.html#signextstd. You'll only need to sign the hash.
  
Ok. But it those samples you always call "sap.setCrypto(key, chain, ...) and i don't have the key or the chain when i'm going to calculate that hash ...
#2.- I know itext is not a PDF Parser (just read 
http://www.lowagie.com/iText/tutorial/ch13.html) and i know 
that there are several java based pdf parsers like PDFBox 
(http://www.pdfbox.org/) or JPedal (http://www.jpedal.org/) 
but i'd like to know if someone has used them successfully. 
All that i need is to read some data of a PDF that is always 
created the same way, so the data to read should be always 
located at the same place (al least, visually, i don't know 
if the PDF bytes would be similar).
    
Results will vary, it depends on the way the pdf was built.
  
I agree, but i'd like to know if someone has been lucky to make it work, and with what parser. I know it doesn't work always, but i'm pretty optimist :)

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