1 // Copyright 2019 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 //////////////////////////////////////////////////////////////////////////////// 16 17 #ifndef TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 18 #define TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 19 20 #include <memory> 21 22 #include "absl/strings/string_view.h" 23 #include "tink/keyset_handle.h" 24 #include "tink/util/statusor.h" 25 26 namespace crypto { 27 namespace tink { 28 29 // KeysetDeriver is the interface used to derive new keysets based on an 30 // additional input, the salt. 31 // 32 // The salt is used to create the keyset using a pseudorandom function. 33 // Implementations must be indistinguishable from ideal KeysetDerivers, which, 34 // for every salt, generates a new random keyset and caches it. 35 class KeysetDeriver { 36 public: 37 virtual crypto::tink::util::StatusOr<std::unique_ptr<KeysetHandle>> 38 DeriveKeyset(absl::string_view salt) const = 0; 39 40 virtual ~KeysetDeriver() = default; 41 }; 42 43 } // namespace tink 44 } // namespace crypto 45 46 #endif // TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 47