fos = new FileOutputStream(privateKeyFilePath);
StringWriter stringWriter = new StringWriter();
/* Write in PEM format (openssl support) */
PEMWriter pemFormatWriter = new PEMWriter(stringWriter);
pemFormatWriter.writeObject(keypair.getPrivate());
pemFormatWriter.close();
fos.write(stringWriter.toString().getBytes());
} catch (IOException ioe) {
throw ioe;
} finally {