> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Fionn Ziegler
> Sent: Thursday, October 25, 2007 4:21 PM
> To: [email protected]
> Subject: Re: [iText-questions] Signing PDF-Document with
> external Certificate and Signature (Signature is INVALID)
>
>
> Hi Paulo,
> thank you for you fast answers! Signing a document works fine
> now! I hav
> some questions to understand my code completely :thinking::
> 1)
> ...
> tSignatureAppearance.setExternalDigest(new byte[512], new
> byte[20], "RSA");
> tSignatureAppearance.preClose();
> ...
> That is a buffer for the extern signature, right? How can i
> make the size
> dynamic?
The size depends on the signature size and the hash. You must know that
before starting.
> 2)
> ...
> PdfLiteral tPDFLiteral = (PdfLiteral)
> tDocumentSignatureDic.get(PdfName.CONTENTS);
> byte[] tOutBytes = new byte[(tPDFLiteral.getPosLength() - 2) / 2];
> ...
> This is a byte-array with the size of the Contents right? why -2 / 2?
The array is placed as an hex string of the form <AABBCC>.
> 3)
> Now i'am signing these bytes:
> ...
> tMessageDigest.digest();
> ...
> I can't sign the bytes from the "getRangestream" method
> direct, why? Or why
> do i need the .digest here:
> tSigner.setExternalDigest(sigenedDigest, digest, "RSA");
That's the way things are done. For more information see the source
code.
Paulo
>
> I'm sorry for all these silly questions, but i'm new in this
> area and i want
> to understand it.
>
> Thanks
>
> Fionn Ziegler
>
>
>
>
> Paulo Soares wrote:
> >
> > You'll always need getRangeStream() to get the bytes that must be
> > signed. If your application needs a file or a byte array
> you'll have to
> > do the conversions and create the needed objects.
> >
> > Paulo
> >
> >
>
>
> -----
> P-(
> --
> View this message in context:
> http://www.nabble.com/Signing-PDF-Document-with-external-Certi
> ficate-and-Signature-%28Signature-is-INVALID%29-tf4639103.html
> #a13409151
> Sent from the iText - General mailing list archive at Nabble.com.
>
>
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