// 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.
//
///////////////////////////////////////////////////////////////////////////////

#include "tink/experimental/pqcrypto/signature/dilithium_key_template.h"

#include "tink/util/constants.h"
#include "proto/experimental/pqcrypto/dilithium.pb.h"
#include "proto/tink.pb.h"

extern "C" {
#include "third_party/pqclean/crypto_sign/dilithium2/api.h"
#include "third_party/pqclean/crypto_sign/dilithium2aes/api.h"
#include "third_party/pqclean/crypto_sign/dilithium3/api.h"
#include "third_party/pqclean/crypto_sign/dilithium3aes/api.h"
#include "third_party/pqclean/crypto_sign/dilithium5/api.h"
#include "third_party/pqclean/crypto_sign/dilithium5aes/api.h"
}

namespace crypto {
namespace tink {
namespace {

using google::crypto::tink::DilithiumKeyFormat;
using google::crypto::tink::DilithiumParams;
using google::crypto::tink::DilithiumPrivateKey;
using google::crypto::tink::DilithiumSeedExpansion;
using google::crypto::tink::KeyTemplate;
using google::crypto::tink::OutputPrefixType;

KeyTemplate* NewDilithiumKeyTemplate(int32_t key_size,
                                     DilithiumSeedExpansion seed_expansion) {
  KeyTemplate* key_template = new KeyTemplate;
  key_template->set_type_url(
      absl::StrCat(kTypeGoogleapisCom, DilithiumPrivateKey().GetTypeName()));
  key_template->set_output_prefix_type(OutputPrefixType::TINK);

  DilithiumKeyFormat key_format;
  DilithiumParams* params = key_format.mutable_params();
  params->set_key_size(key_size);
  params->set_seed_expansion(seed_expansion);
  key_format.SerializeToString(key_template->mutable_value());

  return key_template;
}

}  // anonymous namespace

const google::crypto::tink::KeyTemplate& Dilithium2KeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM2_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_SHAKE);
  return *key_template;
}

const google::crypto::tink::KeyTemplate& Dilithium3KeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM3_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_SHAKE);
  return *key_template;
}

const google::crypto::tink::KeyTemplate& Dilithium5KeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM5_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_SHAKE);
  return *key_template;
}

const google::crypto::tink::KeyTemplate& Dilithium2AesKeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM2AES_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_AES);
  return *key_template;
}

const google::crypto::tink::KeyTemplate& Dilithium3AesKeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM3AES_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_AES);
  return *key_template;
}

const google::crypto::tink::KeyTemplate& Dilithium5AesKeyTemplate() {
  static const KeyTemplate* key_template =
      NewDilithiumKeyTemplate(PQCLEAN_DILITHIUM5AES_CRYPTO_SECRETKEYBYTES,
                              DilithiumSeedExpansion::SEED_EXPANSION_AES);
  return *key_template;
}

}  // namespace tink
}  // namespace crypto