DefaultBootstrap.bootstrap();
  BasicParserPool ppMgr = new BasicParserPool();
  ppMgr.setNamespaceAware(true);

 //Read file from the filesystem

 File file1=new File("F:/Softwares/Assertion.xml");
 InputStream inCommonSaml=new FileInputStream(file1);

 // Parse file
Document inCommonSamlDoc = ppMgr.parse(inCommonSaml);
Element metadataRoot = inCommonSamlDoc.getDocumentElement();
UnmarshallerFactory    unmarshallerFactory=configuration.getUnmarshallerFactory();
 Unmarshaller unmarshaller =    unmarshallerFactory.getUnmarshaller(metadataRoot);
 Response  inCommonSamlRes = (Response)  unmarshaller.unmarshall(metadataRoot);

  //Get certificate
   SignatureValidator signatureValidator = new SignatureValidator(cert);
   Signature  signature=inCommonSamlRes.getSignature();
   signatureValidator.validate(signature);


   try {
        BasicX509Credential credential = new BasicX509Credential();

        File file2=new File("F:/Softwares/publicKey.crt");
        InputStream samlCertificate=new FileInputStream(file2);
          CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
        //
            @SuppressWarnings("deprecation")
            java.security.cert.X509Certificate certificate = (java.security.cert.X509Certificate) certificateFactory.generateCertificate(samlCertificate);
           //

            X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec((certificate).getPublicKey().getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PublicKey key = keyFactory.generatePublic(publicKeySpec);


            credential.setPublicKey(key);
            Object obj = (credential).getPublicKey();
            if (obj instanceof RSAPublicKey) {
                BigInteger modulus = ((RSAPublicKey) obj).getModulus();
                BigInteger exponent = ((RSAPublicKey) obj).getPublicExponent();
                System.out.println("modulus");
                System.out.println (org.apache.commons.codec.binary.Base64.encodeBase64String(modulus.toByteArray()));
                System.out.println("public exponent:");
                System.out.println (org.apache.commons.codec.binary.Base64.encodeBase64String(exponent.toByteArray()));

    }
     //     System.out.println ("public key is: //n//r"+ credential.getPublicKey());
            return credential;



    } catch (Exception e) {
        throw e; //Throws a 'Signature did not validate against the credential's key' exception
    }