Extracts the public key from a x509 certificate.

KeyExtractor.java

CertificateFactory x509 = CertificateFactory.getInstance("X509");

        FileInputStream inStream = new FileInputStream(CERTIFICATE_PATH);
        Certificate certificate = x509.generateCertificate(inStream);

        byte[] encoded = certificate.getPublicKey().getEncoded();
        FileOutputStream fileOutputStream = new FileOutputStream("c:/data/temp/phoenix-public-key.bin");
        fileOutputStream.write(encoded);
        fileOutputStream.close();