internal static extern Status ToMsgPack(
     CompactCiphertextBallotHandle handle, out IntPtr data, out UIntPtr size);
 internal static extern Status GetObjectId(
     CompactCiphertextBallotHandle handle, out IntPtr object_id);
 internal static extern Status FromMsgPack(
     byte *data, ulong size, out CompactCiphertextBallotHandle handle);
 internal static extern Status Free(CompactCiphertextBallotHandle handle);