It may happen if your pdf has javascript or anything else that might
change the appearance after the pdf is signed. Remove all that before
signing.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of [EMAIL PROTECTED]
> Sent: Wednesday, January 16, 2008 11:11 AM
> To: [email protected]
> Subject: [iText-questions] error 4000 "unrecognized PDF
> content" PDF/SigQ
>
>
> Hi,
>
> I have made a test to sign a pdf wih itext:
> the sample at
> http://itextpdf.sourceforge.net/howtosign.html#howtosign seems to
> work fine but when I open the signed PDF with Acrobat 8.1
> (not the reader)
> I can see an error when of conformance to PDF/SigQ
>
> I have linked error dialog box and the signed pdf
>
> thanks in advance for your help
>
> here the code :
>
> KeyStore ks;
> ks = KeyStore.getInstance("pkcs12");
> ks.load(new FileInputStream(fileKey),
> fileKeyPassword.toCharArray());
> String alias = (String) ks.aliases().nextElement();
> PrivateKey key;
> key = (PrivateKey) ks.getKey(alias,
> fileKeyPassword.toCharArray());
> Certificate[] chain = ks.getCertificateChain(alias);
>
> File fileToSign = new File(fname);
> PdfReader pdfReader = new
> PdfReader(fileToSign.getAbsolutePath());
>
> FileOutputStream outputFile = new FileOutputStream(fileToSign
> .getParent()
> + File.separator + fileToSign.getName() +
> "_signed2.pdf");
>
> // Creation du tampon de signature
> PdfStamper pdfStamper;
> pdfStamper = PdfStamper.createSignature(pdfReader,
> outputFile, '\0');
> PdfSignatureAppearance sap =
> pdfStamper.getSignatureAppearance();
> sap.setCrypto(key, chain, null,
> PdfSignatureAppearance.WINCER_SIGNED);
> sap.setReason("I'm the author");
> sap.setLocation("France");
>
> //sap.setVisibleSignature(new Rectangle(10, 10, 50,
> 30), 1, null);
>
> sap.setExternalDigest(new byte[512], new byte[20], "RSA");
> sap.preClose();
> MessageDigest messageDigest =
> MessageDigest.getInstance("SHA1");
> byte buf[] = new byte[8192];
> int n;
> InputStream inp = sap.getRangeStream();
> while ((n = inp.read(buf)) > 0)
> {
> messageDigest.update(buf, 0 , n);
> }
> byte hash[] = messageDigest.digest();
> PdfSigGenericPKCS sg = sap.getSigStandard();
> PdfLiteral slit = (PdfLiteral)sg.get(PdfName.CONTENTS);
> byte[] outc = new byte[(slit.getPosLength() - 2) / 2 ];
> PdfPKCS7 sig = sg.getSigner();
> Signature sign = Signature.getInstance("SHA1withRSA");
> sign.initSign(key);
> sign.update(hash);
> sig.setExternalDigest(sign.sign(), hash, "RSA");
> PdfDictionary dic = new PdfDictionary();
> byte[] ssig = sig.getEncodedPKCS7();
> System.arraycopy(ssig, 0, outc, 0, ssig.length);
> dic.put(PdfName.CONTENTS, new
> PdfString(outc).setHexWriting(true));
> sap.close(dic);
>
>
>
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