1 // Copyright 2017 Google Inc. 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_HMAC_BORINGSSL_H_ 18 #define TINK_SUBTLE_HMAC_BORINGSSL_H_ 19 20 #include <memory> 21 #include <string> 22 #include <utility> 23 24 #include "absl/strings/string_view.h" 25 #include "openssl/evp.h" 26 #include "tink/internal/fips_utils.h" 27 #include "tink/mac.h" 28 #include "tink/subtle/common_enums.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 class HmacBoringSsl : public Mac { 38 public: 39 static crypto::tink::util::StatusOr<std::unique_ptr<Mac>> New( 40 HashType hash_type, uint32_t tag_size, util::SecretData key); 41 42 // Computes and returns the HMAC for 'data'. 43 crypto::tink::util::StatusOr<std::string> ComputeMac( 44 absl::string_view data) const override; 45 46 // Verifies if 'mac' is a correct HMAC for 'data'. 47 // Returns Status::OK if 'mac' is correct, and a non-OK-Status otherwise. 48 crypto::tink::util::Status VerifyMac( 49 absl::string_view mac, 50 absl::string_view data) const override; 51 52 static constexpr crypto::tink::internal::FipsCompatibility kFipsStatus = 53 crypto::tink::internal::FipsCompatibility::kRequiresBoringCrypto; 54 55 private: 56 // Minimum HMAC key size in bytes. 57 static constexpr size_t kMinKeySize = 16; 58 HmacBoringSsl(const EVP_MD * md,uint32_t tag_size,util::SecretData key)59 HmacBoringSsl(const EVP_MD* md, uint32_t tag_size, util::SecretData key) 60 : md_(md), tag_size_(tag_size), key_(std::move(key)) {} 61 62 // HmacBoringSsl is not owner of md (it is owned by BoringSSL). 63 const EVP_MD* const md_; 64 const uint32_t tag_size_; 65 const util::SecretData key_; 66 }; 67 68 } // namespace subtle 69 } // namespace tink 70 } // namespace crypto 71 72 #endif // TINK_SUBTLE_HMAC_BORINGSSL_H_ 73