public JcaX509ExtensionUtils() throws NoSuchAlgorithmException {
  super(new SHA1DigestCalculator(MessageDigest.getInstance("SHA1")));
}

public JcaX509ExtensionUtils ( ) throws NoSuchAlgorithmException { super ( new SHA1DigestCalculator ( MessageDigest . getInstance ( "SHA1" ) ) ) ; }
create a utility class pre - configured with a sha - 1 digest calculator based on the default implementation .
