title: Convert private key in PEM format
body: <p>I have created a self-signed certificate with Java code and added into KeyStore. Now I want to  export Private key and Certificate created, into a file in PEM format. Is it possible to achieve this without any third party library ? Below is the code I use for creating self-singed certificate.</p>
  
  <pre><code>  public void createSelfSignedSSLCertificate() {
      try {            
          final CertAndKeyGen keypair = new CertAndKeyGen("RSA", "SHA1WithRSA", null);
          final X500Name x500Name =
              new X500Name(commonName, organizationalUnit, organization, city, state, country);
          keypair.generate(keysize);
          final PrivateKey privKey = keypair.getPrivateKey();
          final X509Certificate[] chain = new X509Certificate[1];
          chain[0] = keypair.getSelfCertificate(x500Name, new Date(), validity * 24 * 60 * 60);
          final String alias = JettySSLConfiguration.SSL_CERTIFICATE_ALIAS;
          keyStore.setKeyEntry(alias, privKey, keyStorePassword.toCharArray(), chain);
      } catch (final Exception e) {
         // Handle Exception
      }       
  }
  </code></pre>
  
  <p>Any suggestion of how to export the key and certificate into file with PEM format will be really helpful.</p>