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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