This repository is a Kotlin/Java library providing Certificate Transparency (CT) verification for Android and JVM applications. It prevents man-in-the-middle attacks by validating TLS certificates against public CT logs. The library offers multiple integration approaches: Java Security Provider, OkHttp interceptors, TrustManager and HostnameVerifier wrappers for HttpURLConnection/Volley/WebView, and direct API usage. Key features include CT log list fetching and parsing, SCT verification, optional CRL-based certificate revocation checking, and configurable caching. The architecture is modular with a core library, Android-specific extensions, and a sample application demonstrating all integration methods. The code employs modern Kotlin idioms (coroutines, sealed classes, builder patterns) and maintains strong separation of concerns between network fetching, policy enforcement, chain cleaning, and verification logic.
The AN2Linux Client is an Android application designed to forward device notifications to a Linux desktop companion server over secure TLS connections. It intercepts notifications via Android's NotificationListenerService, applies user-configured filters (per-app and global), and transmits notification data to configured servers (Wi-Fi, mobile, or Bluetooth) using certificate-based authentication. The architecture combines Android components (Activities, Services, BroadcastReceivers) with modern patterns like ViewModels/LiveData for UI state management, custom preferences for advanced settings, and isolated cryptographic helpers for TLS operations. Key features include foreground service execution to bypass background restrictions, boot-time auto-start, granular notification filtering, and support for multiple connection types with SSID whitelisting for Wi-Fi.