1 // Copyright 2021 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 17 #ifndef TINK_EXPERIMENTAL_PQCRYPTO_KEM_CECPQ2_AEAD_HKDF_DEM_HELPER_H_ 18 #define TINK_EXPERIMENTAL_PQCRYPTO_KEM_CECPQ2_AEAD_HKDF_DEM_HELPER_H_ 19 20 #include <memory> 21 22 #include "tink/aead.h" 23 #include "tink/daead/subtle/aead_or_daead.h" 24 #include "tink/util/protobuf_helper.h" 25 #include "tink/util/secret_data.h" 26 #include "tink/util/statusor.h" 27 #include "proto/tink.pb.h" 28 29 namespace crypto { 30 namespace tink { 31 32 // A helper for DEM (data encapsulation mechanism) of CECPQ2-AEAD-HKDF. 33 class Cecpq2AeadHkdfDemHelper { 34 public: 35 // Constructs a new helper for the specified DEM key template. 36 static crypto::tink::util::StatusOr< 37 std::unique_ptr<const Cecpq2AeadHkdfDemHelper>> 38 New(const google::crypto::tink::KeyTemplate& dem_key_template); 39 40 virtual ~Cecpq2AeadHkdfDemHelper() = default; 41 42 // Creates and returns a new AeadOrDaead object that uses 43 // a 32-bytes or greater high-entropy seed to generate a key. 44 virtual crypto::tink::util::StatusOr< 45 std::unique_ptr<crypto::tink::subtle::AeadOrDaead>> 46 GetAeadOrDaead(const util::SecretData& seed) const = 0; 47 48 // Return the key material size. 49 virtual crypto::tink::util::StatusOr<uint32_t> GetKeyMaterialSize() const = 0; 50 }; 51 52 } // namespace tink 53 } // namespace crypto 54 55 #endif // TINK_EXPERIMENTAL_PQCRYPTO_KEM_CECPQ2_AEAD_HKDF_DEM_HELPER_H_ 56