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