// 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;

import "quiche/blind_sign_auth/proto/public_metadata.proto";
import "anonymous_tokens/proto/anonymous_tokens.proto";

message SpendTokenData {
  // Public metadata associated with the token being spent.
  // See go/ppn-token-spend and go/ppn-phosphor-at-service for details.
  PublicMetadata public_metadata = 1;

  // The unblinded token to be spent which was blind-signed by Phosphor.
  bytes unblinded_token = 2;

  // The signature for the token to be spent, obtained from Phosphor and
  // unblinded.
  bytes unblinded_token_signature = 3;

  // The version number of the signing key that was used during blind-signing.
  uint64 signing_key_version = 4;

  // A use case identifying the caller. Should be a fixed, hardcoded value to
  // prevent cross-spending tokens.
  anonymous_tokens.AnonymousTokensUseCase use_case = 5;

  // Nonce used to mask plaintext message before cryptographic verification.
  bytes message_mask = 6;

  // General public metadata. Use deserializer to inspect. Only set one of this
  // or public_metadata.
  bytes binary_public_metadata = 7;
}

message PrivacyPassTokenData {
  // The base64 encoded Privacy Pass token.
  string token = 1;

  // The base64 encoded, Privacy Pass compliant binary public metadata.
  string encoded_extensions = 2;

  // Populate only for testing, this will affect which public key is used.
  anonymous_tokens.AnonymousTokensUseCase use_case_override =
      3;
}