Port the GIP protocol and authentication layers from medusalix/xone
into the C++ stack:
- crypto: SHA-256/HMAC (CommonCrypto), RSA PKCS#1 (Security.framework),
and a self-contained P-256 ECDH validated against OpenSSL vectors
- auth: v1 (RSA) and v2 (ECDH) handshake state machine
- gip: header/varint/chunk handling and packet dispatch, with the kernel
device model replaced by transport + client_listener interfaces
Adds test_crypto, test_auth, and test_gip suites.
Co-Authored-By: deepseek (deepseek/deepseek-v4-pro-0813): ported crypto, auth, and GIP
Add the CMake build for the Swift + C++ macOS port, mirroring the
refix layout: deps/ modules (Platform, Flags, Sanitizers, FindUnity),
per-module static libraries (usb, auth, mt76, gip, hid, api), a Swift
app entry point with a pure C bridge header, and a Unity test suite
behind BUILD_TESTING.
Swift requires the Ninja or Xcode generator; a guard in
CMakeLists.txt rejects anything else.
Co-Authored-By: qwen (qwen/qwen3.8-27b@q2_k_xl): scaffolded CMake build + tests
portersky