moved rehash position in classic.cpp

classic.cpp

@@ -97,13 +97,14 @@ struct anti_replay_t
 	}
 	void prepare()
 	{
+		st.rehash(anti_replay_buff_size*10);
 		anti_replay_seq=get_true_random_number();//random first seq
 		const_id=get_true_random_number_nz();
 	}
 	anti_replay_t()
 	{
 		memset(replay_buffer,0,sizeof(replay_buffer));
-		st.rehash(anti_replay_buff_size*10);
+
 		max_packet_received=0;
 		index=0;
 	}