*
   * @since 19.0
   */
  public static HashFunction sha384() {
    return Sha384Holder.SHA_384;
  }

  private static final class Sha384Holder {
    static final HashFunction SHA_384 =
        new MessageDigestHashFunction("SHA-384", "Hashing.sha384()");
  }

  /** Returns a hash function implementing the SHA-512 algorithm (512 hash bits). */