Hi Guys,I have a PDF which is signed with a timestamp. When I try to verify the signature I get the message that this signature is not valid. Especially when I try to read the signatures date - it's null.
See the following code and find the attached pdf. I use Java 1.5 and iText 5.1.3
Thanks in advance for any help
Christian
Code:
public class SignatureVerificationItext {
public static void main(String[] args) {
try {
Security.addProvider(new
org.bouncycastle.jce.provider.BouncyCastleProvider());
PdfReader pdfReader = new
PdfReader("C:\\Users\\pete\\Desktop\\testfiles\\outfile.pdf");
AcroFields af = pdfReader.getAcroFields();
ArrayList<String> names = af.getSignatureNames();
for (String name : names) {
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(); //always null
Certificate[] pkc = pk.getCertificates();
System.out.println("Subject: " +
PdfPKCS7.getSubjectFields(pk.getSigningCertificate()));
System.out.println("Revision modified: " + !pk.verify());
Object fails[] = PdfPKCS7.verifyCertificates(pkc,
PdfPKCS7.loadCacertsKeyStore(), null, cal);
if (fails == null)
System.out.println("works");
else
System.out.println("is not working");
}
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement
use File | Settings | File Templates.
} catch (SignatureException e) {
e.printStackTrace(); //To change body of catch statement
use File | Settings | File Templates.
}
}
}
outputfile_signed_empty_pdf.pdf
Description: Adobe PDF document
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