implemented client-server connection, but found out RSA is broken

src/network/encrypted_sockets.c

@@ -24,6 +24,7 @@ Result(i32) EncryptedSocketTCP_recv(EncryptedSocketTCP* ptr,
 {
     Deferral(4);
     try(i32 received_size, i, socket_recv(ptr->sock, encrypted_buf, flags));
+    //TODO: return something when received_size == 0 (socket has been closed)
     encrypted_buf.size = received_size;
     try(i32 decrypted_size, u, AESStreamDecryptor_decrypt(&ptr->dec, encrypted_buf, decrypted_buf));
     Return RESULT_VALUE(i, decrypted_size);

src/network/tcp-chat-protocol/constant.h

@@ -6,11 +6,13 @@
 
 extern const Magic64 PacketHeader_MAGIC;
 
+// sizeof(PacketHeader) must be 64 
 typedef struct PacketHeader {
     Magic64 magic;
     u8 protocol_version;
-    u8 _reserved;
+    u8 _reserved1;
     u16 type;
+    u32 _reserved4;
     u64 content_size;
 } __attribute__((aligned(64))) PacketHeader;
 

src/network/tcp-chat-protocol/v1.c

@@ -8,3 +8,7 @@ Result(void) ClientHandshake_tryConstruct(ClientHandshake* ptr, Array(u8) sessio
     Return RESULT_VOID;
 }
 
+void ServerHandshake_construct(ServerHandshake* ptr, u64 session_id){
+    PacketHeader_construct(&ptr->header, PROTOCOL_VERSION, PacketType_ClientHandshake, sizeof(session_id));
+    ptr->session_id = session_id;
+}

src/network/tcp-chat-protocol/v1.h

@@ -4,6 +4,7 @@
 
 #define PROTOCOL_VERSION 1 /* 1.0.0 */
 
+
 typedef enum PacketType {
     PacketType_Invalid,
     PacketType_ErrorMessage,
@@ -11,11 +12,13 @@ typedef enum PacketType {
     PacketType_ServerHandshake,
 } __attribute__((__packed__)) PacketType;
 
+
 typedef struct ErrorMessage {
     PacketHeader header;
     /* content stream of size `header.content_size` */
 } ErrorMessage;
 
+
 typedef struct ClientHandshake {
     PacketHeader header;
     u8 session_key[AES_SESSION_KEY_SIZE];
@@ -28,3 +31,5 @@ typedef struct ServerHandshake {
     PacketHeader header;
     u64 session_id;
 } ServerHandshake;
+
+void ServerHandshake_construct(ServerHandshake* ptr, u64 session_id);