@Test
public void testPublicFromPrivateWithRfcTestVectors() throws Exception {

  byte[] out =
      X25519.publicFromPrivate(
          TestUtil.hexDecode("77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a"));
  assertEquals(
      "8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a",
      TestUtil.hexEncode(out));
  out =
      X25519.publicFromPrivate(
          TestUtil.hexDecode("5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb"));
  assertEquals(
      "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f",
      TestUtil.hexEncode(out));
}