cryptography rework and beginning of tcp-chat-protocol

src/db/idb.h

@@ -3,6 +3,7 @@
 #include "tlibc/errors.h"
 
 #define IDB_VERSION 1
+#define IDB_AES_KEY_SIZE 32
 
 typedef struct IncrementalDB IncrementalDB;
 typedef struct Table Table;