Code change:
<ins> /* Copyright 2023 The Kubernetes Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package service import ( "context" "net" "time" "google.golang.org/grpc" "k8s.io/klog/v2" kmsapi "k8s.io/kms/apis/v2alpha1" ) // GRPCService is a gprc server that runs the kms v2 alpha 1 API. type GRPCService struct { addr    string timeout time.Duration server  *grpc.Server kmsService Service } var _ kmsapi.KeyManagementServiceServer = (*GRPCService)(nil) // NewGRPCService creates an instance of GRPCService. func NewGRPCService( address string, timeout time.Duration, kmsService Service, ) *GRPCService { klog.V(4).InfoS("KMS plugin configured", "address", address, "timeout", timeout) return &GRPCService{ addr:       address, timeout:    timeout, kmsService: kmsService, } } // ListenAndServe accepts incoming connections on a Unix socket. It is a blocking method. // Returns non-nil error unless Close or Shutdown is called. func (s *GRPCService) ListenAndServe() error { ln, err := net.Listen("unix", s.addr) if err != nil { return err } defer ln.Close() gs := grpc.NewServer( grpc.ConnectionTimeout(s.timeout), ) s.server = gs kmsapi.RegisterKeyManagementServiceServer(gs, s) klog.V(4).InfoS("kms plugin serving", "address", s.addr) return gs.Serve(ln) } // Shutdown performs a grafecul shutdown. Doesn't accept new connections and // blocks until all pending  RPCs are finished. func (s *GRPCService) Shutdown() { klog.V(4).InfoS("kms plugin shutdown", "address", s.addr) if s.server != nil { s.server.GracefulStop() } } // Close stops the server by closing all connections immediately and cancels // all active RPCs. func (s *GRPCService) Close() { klog.V(4).InfoS("kms plugin close", "address", s.addr) if s.server != nil { s.server.Stop() } } // Status sends a status request to specified kms service. func (s *GRPCService) Status(ctx context.Context, _ *kmsapi.StatusRequest) (*kmsapi.StatusResponse, error) { res, err := s.kmsService.Status(ctx) if err != nil { return nil, err } return &kmsapi.StatusResponse{ Version: res.Version, Healthz: res.Healthz, KeyId:   res.KeyID, }, nil } // Decrypt sends a decryption request to specified kms service. func (s *GRPCService) Decrypt(ctx context.Context, req *kmsapi.DecryptRequest) (*kmsapi.DecryptResponse, error) { klog.V(4).InfoS("decrypt request received", "id", req.Uid) plaintext, err := s.kmsService.Decrypt(ctx, req.Uid, &DecryptRequest{ Ciphertext:  req.Ciphertext, KeyID:       req.KeyId, Annotations: req.Annotations, }) if err != nil { return nil, err } return &kmsapi.DecryptResponse{ Plaintext: plaintext, }, nil } // Encrypt sends an encryption request to specified kms service. func (s *GRPCService) Encrypt(ctx context.Context, req *kmsapi.EncryptRequest) (*kmsapi.EncryptResponse, error) { klog.V(4).InfoS("encrypt request received", "id", req.Uid) encRes, err := s.kmsService.Encrypt(ctx, req.Uid, req.Plaintext) if err != nil { return nil, err } return &kmsapi.EncryptResponse{ Ciphertext:  encRes.Ciphertext, KeyId:       encRes.KeyID, Annotations: encRes.Annotations, }, nil } </ins>

Related discussion:
text: generation for local KEK based on counter; also rotate once a week even if the counter does not hit 2 million? using AES-GCM encryption of local KEK ref: The implementation would be to the directory.
/sig auth /triage accepted
/assign
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/assign
thank you !
/milestone v1.26
Hi bug-triage shadow team member for 1.26 here. Looks like this issue is in the 1.26 milestone, but has been moved to 1.27. Is there something else or should this issue go to 1.27 as well? Thank you!
I just forgot to move this issue /milestone v1.27
/reopen is the partial implementation.
Reopened this issue. <detailsIn response to : /reopen Instructions for interacting with me using PR comments are available . If you have questions or suggestions related to my behavior, please file an issue against the repository. </details
My suggestion on the reference implementation, after reading 's comments is like so... The GRPC server, which implements the expects an implementation that satisfies . The local key logic can be a middleware. So it expects a it can fallback to, if it doesn't know a key or needs to encrypt its own local KEK. So the local implementation would be need to: have a storage of s have a reference to the current in use (if we put it into the cache, it might vanish) have a reference to another , which should be the remote KMS. So the sub-stories could look like: write Middleware write Transformers that can get exhausted (by time, by usage) write 's storage write some dummy for remote KMS? I have some sketches of what I am talking about .