title: X509Certificate - string name to OID in Java
body: <p>How to get value from X509Certificate if I only know name of the field?<br>
  For example "CN" has OID "2.5.4.3", if I know get only string name how can I convert it to OID and get value from field?</p>
  
  <p>How I can get numeric OID if I have only string name of OID?</p>