Hi.
My name is Salvo and i'm developing a Java Applet for signing documents with
iText library.
In first time, I follow the example in that page
(http://itextpdf.sourceforge.net/howtosign.html) and it's all ok. I have
generated a PDF with a valid signature.
Now the problem is that i want to sign a PDF that is located in a web server
with ASP.NET, without send entire PDF to client-side.
For doing that I have developed a web page that contains in a hidden input
field the data of SHA1 hash function (made with ASP.NET and encoded in Base64).
Java applet take the input of this input field and calculate signature (with
BouncyCastle CMS and using client PrivateKey) and return the output of
signature in another input field(Base64 encoded).
A postback of page is made with Javascript and the output of signature was
encapsuled with iTextSharp inside the PDF at server-side.
All it's done without problem, but when I open signed version of PDF with
Acrobat Reader the sign is not valid with reason: the document was modified
after the signing.
So the question is: I have made some mistake in my code or it's not possible to
do a "asynchronous" signature process?
Thanks.
Salvo.
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