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// Copyright 2019 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/keyderivation/key_derivation_key_templates.h"
#include <memory>
#include "tink/keyderivation/internal/prf_based_deriver_key_manager.h"
#include "tink/subtle/random.h"
namespace crypto {
namespace tink {
using ::google::crypto::tink::KeyTemplate;
using ::google::crypto::tink::PrfBasedDeriverKeyFormat;
util::StatusOr<KeyTemplate>
KeyDerivationKeyTemplates::CreatePrfBasedKeyTemplate(
const KeyTemplate& prf_key_template,
const KeyTemplate& derived_key_template) {
KeyTemplate key_template;
key_template.set_type_url(
internal::PrfBasedDeriverKeyManager().get_key_type());
key_template.set_output_prefix_type(
derived_key_template.output_prefix_type());
PrfBasedDeriverKeyFormat format;
*format.mutable_prf_key_template() = prf_key_template;
*format.mutable_params()->mutable_derived_key_template() =
derived_key_template;
format.SerializeToString(key_template.mutable_value());
// Verify `key_template` is derivable.
util::StatusOr<std::unique_ptr<KeysetHandle>> handle =
KeysetHandle::GenerateNew(key_template);
if (!handle.ok()) {
return handle.status();
}
util::StatusOr<std::unique_ptr<KeysetDeriver>> deriver =
(*handle)->GetPrimitive<KeysetDeriver>();
if (!deriver.ok()) {
return deriver.status();
}
return key_template;
}
} // namespace tink
} // namespace crypto
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