jwk-ec-back-and-forth.java

private Optional<ECPublicKey> parseEcPublicKey(String json) {
  try {
    return Optional.ofNullable(((ECKey) JWK.parse(json)).toECPublicKey());
  } catch (ParseException | JOSEException e) {
    // todo: log exception here
    return Optional.empty();
  }
}

private String ecPublicKeyToJwk(ECPublicKey key) {
  return new ECKey.Builder(ECKey.Curve.P_256, key).build().toJSONString();
}

public static Optional<RSAPublicKey> parseRsaPublicKey(String json) {
  try {
    return Optional.ofNullable(((RSAKey) JWK.parse(json)).toRSAPublicKey());
  } catch (ParseException | JOSEException e) {
    // todo: log exception here
    return Optional.empty();
  }
}