This week code will be posted that will fix this and add timestamp and ocsp
signing and verifying. It may be easier to wait a couple of days.
Paulo
> -----Original Message-----
> From: mkl [mailto:[email protected]]
> Sent: Tuesday, June 02, 2009 9:15 AM
> To: [email protected]
> Subject: Re: [iText-questions] Verifying signature!!
> NoSuchAlgorithmException: 1.2.840.113549.1.1.1
>
>
> Robert,
>
> please reply to the list.
>
>
> RobertQ wrote:
> >
> > How are you? You repplied my post "Verifying signature!!
> > NoSuchAlgorithmException: 1.2.840.113549.1.1.1" suggesting me this:
> >
> > mkl wrote:
> >>
> >> Use the AcroFields methods getSignatureNames and
> getSignatureDictionary.
> >> The latter dictionary contains the signature container (key:
> >> PdfName.CONTENTS, apply getOriginalBytes) and the range data (key:
> >> PdfName.BYTERANGE). Use something like the class
> >> PdfSignatureAppearance.RangeStream to extract the signed data.
> >>
> >
> > What I tryied to do is the following:
> >
> > PdfReader reader = new PdfReader(new
> > RandomAccessFileOrArray("temp.pdf"), null);
> > AcroFields acrFs = reader.getAcroFields();
> >
> > PdfDictionary dic =
> acrFs.getSignatureDictionary("Signature1");
> >
> > PdfObject sigContainer = dic.get(PdfName.CONTENTS);
> > PdfObject rangeData = dic.get(PdfName.BYTERANGE);
> >
> > But it didn't work out, I stopped at this point.
> > Can you send me an example code of what you suggested.
> >
>
> What exactly didn't work out?
>
> Obviously you have to inspect the individual attributes more
> thoroughly,
> e.g.:
>
> ((PdfString)PdfReader.getPdfObject(dic.get(PdfName.CONTENTS)))
> .getOriginalBytes()
> contains the signature container and some trailing debris,
> most often filled
> with 0 bytes.
> (PdfArray)PdfReader.getPdfObject(dic.get(PdfName.BYTERANGE))
> will give you
> the byterange array; you might want to use this array in
> concert with a
> class like PdfSignatureAppearance.RangeStream to extract the
> signed data
> stream.
>
> And obviously you should do some sanity checks (e.g. for null
> values) in
> production code...
>
> Regards, Mikel.
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