text: // 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_WRAPPER_H_
  #define TINK_SUBTLE_PRF_STREAMING_PRF_WRAPPER_H_
  
  #include "tink/primitive_set.h"
  #include "tink/primitive_wrapper.h"
  #include "tink/subtle/prf/streaming_prf.h"
  #include "tink/util/statusor.h"
  
  namespace crypto {
  namespace tink {
  
  // Wraps a set of StreamingPrf-instances containing a single StreamingPrf with a
  // raw key into a StreamingPrf (essentially just returning the initial prf).
  //
  // It is unclear how key rotation should work for Prfs; we use this one to
  // produce a single one in case the keyset is compatible, and fail otherwise.
  class StreamingPrfWrapper
      : public PrimitiveWrapper<StreamingPrf, StreamingPrf> {
   public:
    util::StatusOr<std::unique_ptr<StreamingPrf>> Wrap(
        std::unique_ptr<PrimitiveSet<StreamingPrf>> streaming_prf_set)
        const override;
  };
  
  }  // namespace tink
  }  // namespace crypto
  
  #endif  // TINK_SUBTLE_PRF_STREAMING_PRF_WRAPPER_H_
  