// 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
//
//      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.
syntax = "proto3";

package cobalt;

option java_multiple_files = true;
option java_package = "com.google.cobalt";

////////////////////////////////////////////////////////////////////////////////
// NOTE: This file is used by the Cobalt client and the Cobalt servers.
// The source-of-truth of this file is located in Cobalt's open source code
// repository, and the file is copied to Android where it is used by the Cobalt
// client. Do not edit the copy of this file in this Android repo as those edits
// will be overwritten when the file is next copied.
////////////////////////////////////////////////////////////////////////////////

// A CobaltEncryptionKey carries a Cobalt encryption key (public key) along with
// metadata about the key.
message CobaltEncryptionKey {
  // Serialized key.
  bytes serialized_key = 1;

  // Unique index for this key. Used in EncryptedMessage.
  uint32 key_index = 2;

  enum KeyPurpose {
    UNSET = 0;
    SHUFFLER = 1;
    ANALYZER = 2;
  }

  // Encrypt messages for shuffler or analyzer?
  KeyPurpose purpose = 3;
}