Ive try it , and it seams to work FINE !!
Thx all guy's for your help !!
Christian.
mkl wrote:
>
> Christian,
>
>
> java-chris wrote:
>> When you talk about " store the half-baked pdf on the disk ".
>> Im trying to do that by making some serialization on the Stamper but
>> nothing is serializable in ITEXT.
>
> Java serialization currently isn't the way to go here. Simply use the
> PdfStamper to store the result to whereever you want having done
> everything but the actual signature injection. Instead of a signature, you
> may inject some unique placeholder.
>
> Later, when you receive the PKCS#7 container, overwrite the area reserved
> for it with the hex-encoded container using standard Java facilities. All
> you have to do is find that reserved area. This can be done either by
> using some PDF file analysis (using a PdfReader to find the offset of the
> /Content entry of your signature dictionary) or by searching the hex
> encoded unique placeholder (if you had inserted one instead of the
> signature, see above).
>
>
> java-chris wrote:
>> So , im trying to do this way.
>>
>> [CODE]
>> java.io.InputStream s = sap.getRangeStream();
>
> The range stream contains the bytes to sign and in comparison with the
> file saved as proposed above are missing the byte range where the
> signature container is to be embedded. You could use this stream instead,
> but it might be somewhat more difficult.
>
>
> java-chris wrote:
>> PdfReader reader = new PdfReader("blank.in_process");
>> PdfStamper stamper = new PdfStamper(reader,new
>> FileOutputStream("signedDoc.pdf"));
>
> Continuing signing like this is (not yet) a functionality of the
> PdfStamper
>
>
> Andreas Kuehne-2 wrote:
>> - Build a semi-signed PDF with room for the signature
>> - Get the hash value
>> - Store the half-baked PDF on disk
>> - Sign the hash and create a PKCS7-Signature, somtimes later, somewhere
>> - Insert the signature into the spare bytes in the PDF
>> - Ready
>
> The step "Insert the signature into the spare bytes in the PDF" is not
> intended to be done by some PdfStamper but separately.
>
> BTW, if you can easily access the original PDF later on and if you sign in
> append mode, you obviously don't need to store the whole PdfStamper output
> but merely the appended part --- when you receive the PKCS#7 container,
> you can inject it into the bytes reserved for it and then concatenate the
> original PDF and the appended part enhanced with the signature container.
> In this case you can make quite sure that your unique identifier is unique
> enough.
>
> Doing it like this is slightly more sophisticated but may be preferable if
> you have to consider disc space resources, especially when you sign big
> PDF files.
>
> Regards, Michael.
>
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