The AuthMgr protocol authenticates and authorizes clients before they can access trusted HALs, AIDL-defined services in trusted execution environments. Version 1 was designed to allow applications running in a protected virtual machine (pVM) to access services running in a TEE in ARM TrustZone. An implementation of IAuthMgrAuthorization is referred to as an AuthMgr Backend. An implementation of a client of the AuthMgr Backend is referred to as an AuthMgr Frontend.
The comments on IAuthMgrAuthorization describe the requirements for implementing an AuthMgr Backend (implementor of the interface) itself. There are some additional requirements that are specific to Android release versions.
If implementing IAuthMgrAuthorization in Android 16 only one AuthMgr Backend is supported and dynamic service discovery is not supported. The AuthMgr Backend service must be exposed on secure partition ID 0x8001 over VSOCK port 1.