http://itextpdf.sourceforge.net/howtosign.html has an example.
Paulo
----- Original Message -----
From: "Eric Chow" <[EMAIL PROTECTED]>
To: <itext-questions@lists.sourceforge.net>
Sent: Monday, November 06, 2006 9:18 AM
Subject: [iText-questions] Verify digital signature
> Hello,
>
> How can verify the signature in iText?
> - does the document modify?
> - does the certificate valid ?
>
>
> For the modification, I can get some examples for reference but for
> the certificate validation, it always FAILED.
>
>
> The following is my code:
>
> PdfReader reader = new PdfReader(signedPDF);
>
> AcroFields af = reader.getAcroFields();
> ArrayList names = af.getSignatureNames();
>
> for (int k = 0; k < names.size(); ++k) {
> String name = (String) names.get(k);
> System.out.println("Signature name: " + name);
> System.out.println("Signature covers whole document: " +
> af.signatureCoversWholeDocument(name));
> System.out.println("Document revision: " + af.getRevision(name) + " of "
> + af.getTotalRevisions());
>
> PdfPKCS7 pk = af.verifySignature(name);
>
>
> Calendar cal = pk.getSignDate();
> Certificate pkc[] = pk.getCertificates();
> System.out.println("Subject: " +
> PdfPKCS7.getSubjectFields(pk.getSigningCertificate()));
> System.out.println("Document modified: " + !pk.verify());
> Object fails[] = PdfPKCS7.verifyCertificates(pkc, keystore, null, cal);
>
> if (fails == null)
> System.out.println("Certificates verified against the KeyStore");
> else
> System.out.println("Certificate failed: " + fails[1]);
> }
>
>
>
> Best regards,
> Eric
>
> -------------------------------------------------------------------------
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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