/*
 * 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 private_join_and_compute.anonymous_counting_tokens;

import "act/act_v0/act_v0.proto";

option java_multiple_files = true;

// The parameters defining the ACT scheme.
message SchemeParameters {
  oneof scheme_parameters_oneof {
    SchemeParametersV0 scheme_parameters_v0 = 1;
  }
}

message ServerParameters {
  ServerPublicParameters public_parameters = 1;
  ServerPrivateParameters private_parameters = 2;
}

// The Server's public parameters for the ACT scheme.
message ServerPublicParameters {
  oneof server_public_parameters_oneof {
    ServerPublicParametersV0 server_public_parameters_v0 = 1;
  }
}

// The Server's private parameters for the ACT scheme.
message ServerPrivateParameters {
  oneof server_private_parameters_oneof {
    ServerPrivateParametersV0 server_private_parameters_v0 = 1;
  }
}

message ClientParameters {
  ClientPublicParameters public_parameters = 1;
  ClientPrivateParameters private_parameters = 2;
}

// The Client's public parameters for the ACT scheme.
message ClientPublicParameters {
  oneof client_public_parameters_oneof {
    ClientPublicParametersV0 client_public_parameters_v0 = 1;
  }
}

// The Client's private parameters for the ACT scheme.
message ClientPrivateParameters {
  oneof client_private_parameters_oneof {
    ClientPrivateParametersV0 client_private_parameters_v0 = 1;
  }
}

// The Client's token request. Can correspond to a batch of tokens.
message TokensRequest {
  oneof tokens_request_oneof {
    TokensRequestV0 tokens_request_v0 = 1;
  }
}

// Private state corresponding to the Client's token request, needed to recover
// the tokens from the server's response.
message TokensRequestPrivateState {
  oneof tokens_request_private_state_oneof {
    TokensRequestPrivateStateV0 tokens_request_private_state_v0 = 1;
  }
}

// The Server's response to a TokensRequest. Can correspond to a batch of
// tokens.
message TokensResponse {
  oneof tokens_response_oneof {
    TokensResponseV0 tokens_response_v0 = 1;
  }
}

// An actual token recovered from the TokenResponse.
message Token {
  reserved 1;

  oneof token_oneof {
    TokenV0 token_v0 = 2;
  }

  // Serialized BigNum corresponding to the nonce for this token.
  bytes nonce_bytes = 3;
}