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// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
// setup Signature configuration
SignatureConfig signConfig = CommonUtilities.getConfiguration(); 
// instantiating the conversion handler
SignatureHandler handler = new SignatureHandler(signConfig);
// setup digital verification options
PDFVerifyDigitalOptions verifyOptions = new PDFVerifyDigitalOptions(CommonUtilities.getCertificatePath("certificate.cer"));
verifyOptions.setReason("Test reason");
verifyOptions.setContact("Test contact");
verifyOptions.setLocation("Test location");
//verify document
VerificationResult result = handler.verify(CommonUtilities.getStoragePath(fileName), verifyOptions);
System.out.println("Signed file verification result: " + result.isValid());