Architecture

flowchart TB
    subgraph Legende
        TeamNetwatch[Team NetWatch]
        j&s-soft
        Android
    end
    subgraph CryptoAbstractionLayer [Crypto Abstraction Layer]
        AndroidProvider[Android Provider]
        KeystoreWrapper[Keystore Wrapper]
    end

    AndroidProvider --> KeystoreWrapper
    KeystoreWrapper --> KeystoreAPI
    KeystoreAPI --> HSM
       
    
    style KeystoreAPI fill:#99cc99,stroke:#333,stroke-width:2px;
    style HSM fill:#99cc99,stroke:#333,stroke-width:2px;
    style CryptoAbstractionLayer fill:#FFFF99,stroke:#333,stroke-width:2px,fontColor:#000000;
    style AndroidProvider fill:#ADD8E6;
    style KeystoreWrapper fill:#ADD8E6;
    style TeamNetwatch fill:#ADD8E6,stroke:#333,stroke-width:2px;
    style j&s-soft fill:#FFFF99,stroke:#333,stroke-width:2px;
    style Android fill:#99cc99,stroke:#333,stroke-width:2px;

Crypto Abstraction Layer

The Crypto Abstraction Layer is being developed by j&s-soft GmbH and invokes methods from the Android Providers.

Android Provider

The Android Provider furnishes the necessary functionalities required by the Crypto Abstraction Layer. Within the Android Provider, data is formatted in a way that the Keystore API can handle, and conversely, data returned by the Keystore API is reformatted for the Crypto Abstraction Layer.

Keystore Wrapper

The Keystore Wrapper receives essential data and parameters from the Android Provider, which it then forwards to the Keystore API.

Keystore API

The Keystore API enables communication with the HSM.

HSM

The HSM is the hardware responsible for performing cryptographic procedures and securely storing the key.