1 // Copyright 2020 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_SUBTLE_STATEFUL_HMAC_BORINGSSL_H_ 18 #define TINK_SUBTLE_STATEFUL_HMAC_BORINGSSL_H_ 19 20 #include <memory> 21 #include <string> 22 #include <utility> 23 24 #include "openssl/evp.h" 25 #include "openssl/hmac.h" 26 #include "tink/internal/ssl_unique_ptr.h" 27 #include "tink/subtle/common_enums.h" 28 #include "tink/subtle/mac/stateful_mac.h" 29 #include "tink/util/secret_data.h" 30 #include "tink/util/status.h" 31 #include "tink/util/statusor.h" 32 33 namespace crypto { 34 namespace tink { 35 namespace subtle { 36 37 // A BoringSSL HMAC implementation of Stateful Mac interface. 38 class StatefulHmacBoringSsl : public subtle::StatefulMac { 39 public: 40 static util::StatusOr<std::unique_ptr<StatefulMac>> New( 41 HashType hash_type, uint32_t tag_size, const util::SecretData& key_value); 42 util::Status Update(absl::string_view data) override; 43 util::StatusOr<std::string> Finalize() override; 44 45 private: 46 // Minimum HMAC key size in bytes. 47 static constexpr size_t kMinKeySize = 16; 48 StatefulHmacBoringSsl(uint32_t tag_size,internal::SslUniquePtr<HMAC_CTX> ctx)49 StatefulHmacBoringSsl(uint32_t tag_size, internal::SslUniquePtr<HMAC_CTX> ctx) 50 : hmac_context_(std::move(ctx)), tag_size_(tag_size) {} 51 52 const internal::SslUniquePtr<HMAC_CTX> hmac_context_; 53 const uint32_t tag_size_; 54 }; 55 56 class StatefulHmacBoringSslFactory : public subtle::StatefulMacFactory { 57 public: 58 StatefulHmacBoringSslFactory(HashType hash_type, uint32_t tag_size, 59 const util::SecretData& key_value); 60 util::StatusOr<std::unique_ptr<StatefulMac>> Create() const override; 61 62 private: 63 const HashType hash_type_; 64 const uint32_t tag_size_; 65 const util::SecretData key_value_; 66 }; 67 68 } // namespace subtle 69 } // namespace tink 70 } // namespace crypto 71 72 #endif // TINK_SUBTLE_STATEFUL_HMAC_BORINGSSL_H_ 73