AVL AES Key Handling

sequenceDiagram

participant "Device" as Dev;
participant "Device TCP Session" as Dev_TCP;
participant "D2Sphere TCP Session" as D2S_TCP; 
participant "D2Sphere Database" as D2S_DB;
participant "D2SPhere REST API" as D2S_API;
 
autonumber
... create D2Sphere TCP conncetion ...
Dev -> Dev_TCP : create TCP session
Dev_TCP -> D2S_TCP : sent Login plain (contains uuid/IMEI and used enryption mode)
Dev_TCP <- Dev : load AES key from TPM key store to AES module
Dev_TCP <- Dev_TCP : start using enryption
Dev_TCP <- Dev_TCP : parse Login, mode, uuid
Dev_TCP <- D2S_DB : load AES key for uuid
D2S_TCP <- D2S_TCP : start using enryption
Dev_TCP <-> D2S_TCP : excahnge data
Dev_TCP <-> D2S_TCP : excahnge data

... key change via REST API ...
Dev_TCP <-> D2S_TCP : excahnge data
Dev_TCP <-> D2S_TCP : excahnge data
D2S_TCP <- D2S_API: keychange request with new key
Dev_TCP <- D2S_TCP : sent new Key
Dev <- Dev_TCP : store new key in TPM key store
D2S_TCP <- Dev_TCP : sent ACK / OK:ERROR
Dev_TCP <- Dev_TCP : use new Key
D2S_TCP <- D2S_TCP : receive ACK / OK
D2S_DB <- D2S_TCP : store new Key
D2S_TCP -> D2S_API : respond API request
D2S_TCP <- D2S_TCP : use new key
Dev_TCP <-> D2S_TCP : excahnge data with new Key
Dev_TCP <-> D2S_TCP : excahnge data with new Key