// Copyright 2021 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;

enum DilithiumSeedExpansion {
  SEED_EXPANSION_UNKNOWN = 0;
  SEED_EXPANSION_SHAKE = 1;
  SEED_EXPANSION_AES = 2;
}

// Protos for Dilithium Digital Signature Algorithm.
// See https://pq-crystals.org/dilithium/data/dilithium-specification-round3.pdf
message DilithiumParams {
  // Required
  int32 key_size = 1;
  // Required.
  DilithiumSeedExpansion seed_expansion = 2;
}

message DilithiumKeyFormat {
  uint32 version = 1;
  // Required.
  DilithiumParams params = 2;
}

// key_type: type.googleapis.com/google.crypto.tink.DilithiumPublicKey
message DilithiumPublicKey {
  // Required.
  uint32 version = 1;
  // Required.
  bytes key_value = 2;
  // Required
  DilithiumParams params = 3;
}

// key_type: type.googleapis.com/google.crypto.tink.DilithiumPrivateKey
message DilithiumPrivateKey {
  // Required.
  uint32 version = 1;
  // Required.
  bytes key_value = 2;
  // The corresponding public key.
  DilithiumPublicKey public_key = 3;
}