text: // 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/jwt/internal/raw_jwt_ecdsa_sign_key_manager.h"
  
  #include <string>
  #include <utility>
  
  #include "absl/memory/memory.h"
  #include "absl/strings/string_view.h"
  #include "tink/internal/ec_util.h"
  #include "tink/jwt/internal/raw_jwt_ecdsa_verify_key_manager.h"
  #include "tink/public_key_sign.h"
  #include "tink/subtle/ecdsa_sign_boringssl.h"
  #include "tink/util/enums.h"
  #include "tink/util/errors.h"
  #include "tink/util/protobuf_helper.h"
  #include "tink/util/secret_data.h"
  #include "tink/util/status.h"
  #include "tink/util/statusor.h"
  #include "tink/util/validation.h"
  #include "proto/jwt_ecdsa.pb.h"
  
  namespace crypto {
  namespace tink {
  namespace jwt_internal {
  
  using crypto::tink::util::Enums;
  using crypto::tink::util::Status;
  using crypto::tink::util::StatusOr;
  using google::crypto::tink::JwtEcdsaKeyFormat;
  using google::crypto::tink::JwtEcdsaPrivateKey;
  using google::crypto::tink::JwtEcdsaPublicKey;
  
  StatusOr<JwtEcdsaPrivateKey> RawJwtEcdsaSignKeyManager::CreateKey(
      const JwtEcdsaKeyFormat& jwt_ecdsa_key_format) const {
    // Generate new EC key.
    util::StatusOr<google::crypto::tink::EllipticCurveType> curve =
        RawJwtEcdsaVerifyKeyManager::CurveForEcdsaAlgorithm(
            jwt_ecdsa_key_format.algorithm());
    if (!curve.ok()) {
      return curve.status();
    }
  
    util::StatusOr<internal::EcKey> ec_key =
        internal::NewEcKey(util::Enums::ProtoToSubtle(*curve));
    if (!ec_key.ok()) return ec_key.status();
  
    // Build EcdsaPrivateKey.
    JwtEcdsaPrivateKey jwt_ecdsa_private_key;
    jwt_ecdsa_private_key.set_version(get_version());
    jwt_ecdsa_private_key.set_key_value(
        std::string(util::SecretDataAsStringView(ec_key->priv)));
    auto jwt_ecdsa_public_key = jwt_ecdsa_private_key.mutable_public_key();
    jwt_ecdsa_public_key->set_version(get_version());
    jwt_ecdsa_public_key->set_x(ec_key->pub_x);
    jwt_ecdsa_public_key->set_y(ec_key->pub_y);
    jwt_ecdsa_public_key->set_algorithm(jwt_ecdsa_key_format.algorithm());
    return jwt_ecdsa_private_key;
  }
  
  StatusOr<std::unique_ptr<PublicKeySign>>
  RawJwtEcdsaSignKeyManager::PublicKeySignFactory::Create(
      const JwtEcdsaPrivateKey& jwt_ecdsa_private_key) const {
    const JwtEcdsaPublicKey& public_key = jwt_ecdsa_private_key.public_key();
    internal::EcKey ec_key;
    util::StatusOr<google::crypto::tink::EllipticCurveType> curve =
        RawJwtEcdsaVerifyKeyManager::CurveForEcdsaAlgorithm(
            public_key.algorithm());
    if (!curve.ok()) {
      return curve.status();
    }
    ec_key.curve = Enums::ProtoToSubtle(*curve);
    ec_key.pub_x = public_key.x();
    ec_key.pub_y = public_key.y();
    ec_key.priv =
        util::SecretDataFromStringView(jwt_ecdsa_private_key.key_value());
    util::StatusOr<google::crypto::tink::HashType> hash_type =
        RawJwtEcdsaVerifyKeyManager::HashForEcdsaAlgorithm(
            public_key.algorithm());
    if (!hash_type.ok()) {
      return hash_type.status();
    }
    auto result = subtle::EcdsaSignBoringSsl::New(
        ec_key, Enums::ProtoToSubtle(*hash_type),
        subtle::EcdsaSignatureEncoding::IEEE_P1363);
    if (!result.ok()) return result.status();
    return {*std::move(result)};
  }
  
  Status RawJwtEcdsaSignKeyManager::ValidateKey(
      const JwtEcdsaPrivateKey& key) const {
    Status status = ValidateVersion(key.version(), get_version());
    if (!status.ok()) return status;
    return RawJwtEcdsaVerifyKeyManager().ValidateKey(key.public_key());
  }
  
  Status RawJwtEcdsaSignKeyManager::ValidateKeyFormat(
      const JwtEcdsaKeyFormat& key_format) const {
    return RawJwtEcdsaVerifyKeyManager::ValidateAlgorithm(key_format.algorithm());
  }
  
  }  // namespace jwt_internal
  }  // namespace tink
  }  // namespace crypto
  