.isEqualTo("Hashing.hmacSha256(Key[algorithm=HmacSHA256, format=RAW])");

    assertThat(hmacSha512(SHA512_KEY).toString())
        .isEqualTo("Hashing.hmacSha512(Key[algorithm=HmacSHA512, format=RAW])");
    assertThat(hmacSha512(keyData).toString())
        .isEqualTo("Hashing.hmacSha512(Key[algorithm=HmacSHA512, format=RAW])");
  }

  private static void assertMacHashing(

   * @throws IllegalArgumentException if the given key is inappropriate for initializing this MAC
   * @since 20.0
   */
  public static HashFunction hmacSha512(Key key) {
    return new MacHashFunction("HmacSHA512", key, hmacToString("hmacSha512", key));
  }

  /**
   * Returns a hash function implementing the Message Authentication Code (MAC) algorithm, using the