// Copyright 2020 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 google.crypto.tink;

option java_package = "com.google.crypto.tink.proto";
option java_multiple_files = true;
option go_package = "github.com/google/tink/proto/jwt_hmac_go_proto";

// See https://datatracker.ietf.org/doc/html/rfc7518#section-3.2
enum JwtHmacAlgorithm {
  HS_UNKNOWN = 0;
  HS256 = 1;  // HMAC using SHA-256
  HS384 = 2;  // HMAC using SHA-384
  HS512 = 3;  // HMAC using SHA-512
}

// key_type: type.googleapis.com/google.crypto.tink.JwtHmacKey
message JwtHmacKey {
  uint32 version = 1;
  JwtHmacAlgorithm algorithm = 2;
  bytes key_value = 3;

  // Optional, custom kid header value to be used with "RAW" keys.
  // "TINK" keys with this value set will be rejected.
  message CustomKid {
    string value = 1;
  }
  CustomKid custom_kid = 4;
}

message JwtHmacKeyFormat {
  uint32 version = 1;
  JwtHmacAlgorithm algorithm = 2;
  uint32 key_size = 3;
}