static void Verify()
{
String digestAlgorithm = "";
String encryptionAlgorithm = "";
DateTime signDate;
bool verifyTimeStamp = false;
Org.BouncyCastle.X509.X509Certificate signCert;
bool revokeStatus = false;
bool isTSP = false;
PdfDocument pdfDocument = new PdfDocument(new PdfReader("c:\\temp\\valid signed contract.pdf"));
// Checks that signature is genuine and the document was not modified.
Boolean genuineAndWasNotModified = false;
String signatureFieldName = "Signature1";
SignatureUtil signatureUtil = new SignatureUtil(pdfDocument);
try
{
PdfPKCS7 signature1 = signatureUtil.ReadSignatureData(signatureFieldName);
if (signature1 != null)
{
genuineAndWasNotModified = signature1.VerifySignatureIntegrityAndAuthenticity();
digestAlgorithm = signature1.GetDigestAlgorithm();
encryptionAlgorithm = signature1.GetEncryptionAlgorithm();
signDate = signature1.GetTimeStampDate();
verifyTimeStamp = signature1.VerifyTimestampImprint();
signDate = signature1.GetSignDate();
signCert = signature1.GetSigningCertificate();
isTSP = signature1.IsTsp();
revokeStatus = signature1.IsRevocationValid();
}
}
catch (iText.Signatures.VerificationException issue)
{
issue.
}
catch (Exception ignored)
{
// ignoring exceptions,
// we are only interested in signatures that are passing the check successfully
}
pdfDocument.Close();
}
