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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.
//
////////////////////////////////////////////////////////////////////////////////
#ifndef TINK_KEYDERIVATION_KEYSET_DERIVER_H_
#define TINK_KEYDERIVATION_KEYSET_DERIVER_H_
#include <memory>
#include "absl/strings/string_view.h"
#include "tink/keyset_handle.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
// KeysetDeriver is the interface used to derive new keysets based on an
// additional input, the salt.
//
// The salt is used to create the keyset using a pseudorandom function.
// Implementations must be indistinguishable from ideal KeysetDerivers, which,
// for every salt, generates a new random keyset and caches it.
class KeysetDeriver {
public:
virtual crypto::tink::util::StatusOr<std::unique_ptr<KeysetHandle>>
DeriveKeyset(absl::string_view salt) const = 0;
virtual ~KeysetDeriver() = default;
};
} // namespace tink
} // namespace crypto
#endif // TINK_KEYDERIVATION_KEYSET_DERIVER_H_
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