1*e7b1675dSTing-Kang Chang // Copyright 2019 Google LLC 2*e7b1675dSTing-Kang Chang // 3*e7b1675dSTing-Kang Chang // Licensed under the Apache License, Version 2.0 (the "License"); 4*e7b1675dSTing-Kang Chang // you may not use this file except in compliance with the License. 5*e7b1675dSTing-Kang Chang // You may obtain a copy of the License at 6*e7b1675dSTing-Kang Chang // 7*e7b1675dSTing-Kang Chang // http://www.apache.org/licenses/LICENSE-2.0 8*e7b1675dSTing-Kang Chang // 9*e7b1675dSTing-Kang Chang // Unless required by applicable law or agreed to in writing, software 10*e7b1675dSTing-Kang Chang // distributed under the License is distributed on an "AS IS" BASIS, 11*e7b1675dSTing-Kang Chang // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*e7b1675dSTing-Kang Chang // See the License for the specific language governing permissions and 13*e7b1675dSTing-Kang Chang // limitations under the License. 14*e7b1675dSTing-Kang Chang // 15*e7b1675dSTing-Kang Chang //////////////////////////////////////////////////////////////////////////////// 16*e7b1675dSTing-Kang Chang 17*e7b1675dSTing-Kang Chang #ifndef TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 18*e7b1675dSTing-Kang Chang #define TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 19*e7b1675dSTing-Kang Chang 20*e7b1675dSTing-Kang Chang #include <memory> 21*e7b1675dSTing-Kang Chang 22*e7b1675dSTing-Kang Chang #include "absl/strings/string_view.h" 23*e7b1675dSTing-Kang Chang #include "tink/keyset_handle.h" 24*e7b1675dSTing-Kang Chang #include "tink/util/statusor.h" 25*e7b1675dSTing-Kang Chang 26*e7b1675dSTing-Kang Chang namespace crypto { 27*e7b1675dSTing-Kang Chang namespace tink { 28*e7b1675dSTing-Kang Chang 29*e7b1675dSTing-Kang Chang // KeysetDeriver is the interface used to derive new keysets based on an 30*e7b1675dSTing-Kang Chang // additional input, the salt. 31*e7b1675dSTing-Kang Chang // 32*e7b1675dSTing-Kang Chang // The salt is used to create the keyset using a pseudorandom function. 33*e7b1675dSTing-Kang Chang // Implementations must be indistinguishable from ideal KeysetDerivers, which, 34*e7b1675dSTing-Kang Chang // for every salt, generates a new random keyset and caches it. 35*e7b1675dSTing-Kang Chang class KeysetDeriver { 36*e7b1675dSTing-Kang Chang public: 37*e7b1675dSTing-Kang Chang virtual crypto::tink::util::StatusOr<std::unique_ptr<KeysetHandle>> 38*e7b1675dSTing-Kang Chang DeriveKeyset(absl::string_view salt) const = 0; 39*e7b1675dSTing-Kang Chang 40*e7b1675dSTing-Kang Chang virtual ~KeysetDeriver() = default; 41*e7b1675dSTing-Kang Chang }; 42*e7b1675dSTing-Kang Chang 43*e7b1675dSTing-Kang Chang } // namespace tink 44*e7b1675dSTing-Kang Chang } // namespace crypto 45*e7b1675dSTing-Kang Chang 46*e7b1675dSTing-Kang Chang #endif // TINK_KEYDERIVATION_KEYSET_DERIVER_H_ 47