tree bedba57a5820242b4b2b69e59fb781c9d7af53db
parent ca11109f62b75f281a333c40295e75b072a4db7b
author QUICHE team <quiche-dev@google.com> 1781853994 -0700
committer Copybara-Service <copybara-worker@google.com> 1781854029 -0700

[SM] CL 1/n: Refactor BlindSignAuth to accept generic attestation data

- Refactor BlindSignAuth to accept `google::protobuf::Any` for attestation data to enable cross-platform compatibility.

- By replacing the `absl::Span<const std::string>` parameter (which was previously used to pass Android-specific attestation certificates) with a generic `Any` protobuf, we decouple the core QUICHE library from platform-specific attestation structures. The responsibility of constructing the platform-specific proto (e.g., `AndroidAttestationData` for Android or `IosAttestationData` for Apple devices) is now correctly delegated to the platform-specific callers (like the Android JNI layer).

- It was chosen to refactor the interface rather than introducing method overloads (i.e. maintaining the old Android signature alongside a new iOS signature) to keep the core `BlindSignAuth` library clean and fully platform-agnostic. Overloading would require the core library to continue parsing and depending on Android-specific protos. The chosen approach enforces a cleaner separation of concerns, ensuring that the core library only acts as a pass-through for opaque `Any` payloads.

#SM

PiperOrigin-RevId: 934771494