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# AVL AES Key Handling
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# AVL AES Key Handling
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```mermaid
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```mermaid
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sequenceDiagram
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sequenceDiagram
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autonumber
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autonumber
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... create D2Sphere TCP conncetion ...
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... create D2Sphere TCP conncetion ...
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Dev -> Dev_TCP : create TCP session
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Dev -> Dev_TCP : create TCP session
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Dev_TCP -> D2S_TCP : sent Login plain (contains uuid/IMEI and used enryption mode)
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Dev_TCP -> D2S_TCP : sent Login plain (contains uuid/IMEI and used enryption mode)
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Dev_TCP <- Dev : load AES key from TPM key store to AES module
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Dev_TCP <- Dev_TCP : start using enryption
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Dev_TCP <- Dev_TCP : parse Login, mode, uuid
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Dev_TCP <- D2S_DB : load AES key for uuid
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D2S_TCP <- D2S_TCP : start using enryption
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Dev_TCP <-> D2S_TCP : excahnge data
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Dev_TCP <-> D2S_TCP : excahnge data
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... key change via REST API ...
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Dev_TCP <-> D2S_TCP : excahnge data
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Dev_TCP <-> D2S_TCP : excahnge data
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D2S_TCP <- D2S_API: keychange request with new key
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Dev_TCP <- D2S_TCP : sent new Key
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Dev <- Dev_TCP : store new key in TPM key store
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D2S_TCP <- Dev_TCP : sent ACK / OK:ERROR
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Dev_TCP <- Dev_TCP : use new Key
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D2S_TCP <- D2S_TCP : receive ACK / OK
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D2S_DB <- D2S_TCP : store new Key
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D2S_TCP -> D2S_API : respond API request
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D2S_TCP <- D2S_TCP : use new key
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Dev_TCP <-> D2S_TCP : excahnge data with new Key
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Dev_TCP <-> D2S_TCP : excahnge data with new Key
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``` |
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``` |
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\ No newline at end of file |
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