|  | // Copyright 2023 Google LLC | 
|  | // | 
|  | // 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 | 
|  | // | 
|  | //     https://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. | 
|  |  | 
|  | syntax = "proto3"; | 
|  |  | 
|  | package privacy.ppn; | 
|  |  | 
|  | option java_multiple_files = true; | 
|  |  | 
|  | // Indicates client's desired or capable key support. | 
|  | enum KeyType { | 
|  | reserved 3; | 
|  | UNKNOWN_KEY_TYPE = 0; | 
|  | ZINC_KEY_TYPE = 1; | 
|  | AT_PUBLIC_METADATA_KEY_TYPE = 2; | 
|  | } |