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 #ifndef TINK_SUBTLE_PRF_STREAMING_PRF_H_ 17*e7b1675dSTing-Kang Chang #define TINK_SUBTLE_PRF_STREAMING_PRF_H_ 18*e7b1675dSTing-Kang Chang 19*e7b1675dSTing-Kang Chang #include <memory> 20*e7b1675dSTing-Kang Chang 21*e7b1675dSTing-Kang Chang #include "absl/strings/string_view.h" 22*e7b1675dSTing-Kang Chang #include "tink/input_stream.h" 23*e7b1675dSTing-Kang Chang 24*e7b1675dSTing-Kang Chang namespace crypto { 25*e7b1675dSTing-Kang Chang namespace tink { 26*e7b1675dSTing-Kang Chang 27*e7b1675dSTing-Kang Chang /////////////////////////////////////////////////////////////////////////////// 28*e7b1675dSTing-Kang Chang // Streaming API interface for PseudoRandomFunctions. 29*e7b1675dSTing-Kang Chang // 30*e7b1675dSTing-Kang Chang // Implementations of this are indistinguishable from true random functions. 31*e7b1675dSTing-Kang Chang // 32*e7b1675dSTing-Kang Chang // For a formal description of the security properties, see the documentation in 33*e7b1675dSTing-Kang Chang // the corresponding Java class. 34*e7b1675dSTing-Kang Chang class StreamingPrf { 35*e7b1675dSTing-Kang Chang public: 36*e7b1675dSTing-Kang Chang // Returns a stream of pseudorandom bytes for this input. Calling Get twice 37*e7b1675dSTing-Kang Chang // with the same input will return a copy of the same input stream. 38*e7b1675dSTing-Kang Chang virtual std::unique_ptr<InputStream> ComputePrf( 39*e7b1675dSTing-Kang Chang absl::string_view input) const = 0; 40*e7b1675dSTing-Kang Chang 41*e7b1675dSTing-Kang Chang virtual ~StreamingPrf() = default; 42*e7b1675dSTing-Kang Chang }; 43*e7b1675dSTing-Kang Chang 44*e7b1675dSTing-Kang Chang } // namespace tink 45*e7b1675dSTing-Kang Chang } // namespace crypto 46*e7b1675dSTing-Kang Chang 47*e7b1675dSTing-Kang Chang #endif // TINK_SUBTLE_PRF_STREAMING_PRF_H_ 48