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Nano base key #273

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@mkleene mkleene commented Jul 9, 2025

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Summary of Changes

Hello @mkleene, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the SDK's key management capabilities by introducing a 'base key' concept for NanoTDFs and refactoring the key splitting and autoconfiguration logic. The changes allow for more dynamic and policy-driven key access, improving the flexibility and robustness of TDF creation and decryption processes.

Highlights

  • Base Key Support for NanoTDF: Introduced a mechanism to fetch a 'base key' for NanoTDFs from a well-known configuration endpoint. This base key can serve as a default or fallback KAS public key for encryption, enhancing flexibility in key management.
  • Enhanced Key Management with Key IDs (KIDs): The SDK's KAS information handling and caching (KASKeyCache) have been updated to explicitly incorporate Key IDs (KIDs). This allows for more precise identification and retrieval of specific public keys, especially when multiple keys are associated with a single KAS.
  • Refactored Key Splitting and Autoconfiguration: The complex logic for determining key splitting plans and resolving KAS public keys has been extracted into a new Planner class. This refactoring improves modularity, maintainability, and allows for more sophisticated policy-driven key mapping directly from attribute definitions and values within the policy service.
  • Platform Dependency Upgrade: The underlying platform protocol dependency has been upgraded from v0.3.0 to v0.5.0. This update likely provides compatibility with new backend features that support the base key and enhanced policy capabilities.
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