| // 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_SUBTLE_PRF_STREAMING_PRF_H_ |
| #define TINK_SUBTLE_PRF_STREAMING_PRF_H_ |
| |
| #include <memory> |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/input_stream.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Streaming API interface for PseudoRandomFunctions. |
| // |
| // Implementations of this are indistinguishable from true random functions. |
| // |
| // For a formal description of the security properties, see the documentation in |
| // the corresponding Java class. |
| class StreamingPrf { |
| public: |
| // Returns a stream of pseudorandom bytes for this input. Calling Get twice |
| // with the same input will return a copy of the same input stream. |
| virtual std::unique_ptr<InputStream> ComputePrf( |
| absl::string_view input) const = 0; |
| |
| virtual ~StreamingPrf() {} |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_SUBTLE_PRF_STREAMING_PRF_H_ |