private X509Certificate[] createValidCertificateChainWithDN(String... dns) {

        X509Certificate[] result = new X509Certificate[dns.length];

        

        X500Principal signerDN = m_keystore.getCA_DN();

        KeyPair signerKeyPair = m_keystore.getCA_KeyPair();



        for (int i = 0; i < result.length; i++) {

            KeyPair certKeyPair = m_keystore.generateKeyPair();

            

            String dn = dns[i];

            int idx = result.length - i - 1;

            

            result[idx] = m_keystore.createCertificate(signerDN, signerKeyPair.getPrivate(), dn, yesterday(), tomorrow(), certKeyPair.getPublic());

            

            signerDN = result[idx].getSubjectX500Principal();

            signerKeyPair = certKeyPair;

        }

        return result;

    }