code: public static BasicConstraints getBasicConstraints(X509Extension ext)
              throws IOException {
  
          ASN1Object object = X509Extension.convertValueToObject(ext);
          return BasicConstraints.getInstance(object);
      }
docs: Creates a <code>BasicConstraints</code> object from given extension.
  
  @param ext the extension.
  @return the <code>BasicConstraints</code> object.
  @throws IOException if something fails.