message: Making package-private.
  GitOrigin-RevId:
diff: @@ -44,7 +44,7 @@ import java.util.Arrays;
  * (2008) Twisted Edwards Curves Revisited</a>
  */
  @Alpha
  -public final class Ed25519 {
  +final class Ed25519 {
  public static final int SECRET_KEY_LEN = FIELD_LEN;
  public static final int PUBLIC_KEY_LEN = FIELD_LEN;
  