1 // Copyright 2018 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_INTEGRATION_AWSKMS_AWS_KMS_AEAD_H_ 18 #define TINK_INTEGRATION_AWSKMS_AWS_KMS_AEAD_H_ 19 20 #include "aws/kms/KMSClient.h" 21 #include "absl/strings/string_view.h" 22 #include "tink/aead.h" 23 #include "tink/util/statusor.h" 24 25 namespace crypto { 26 namespace tink { 27 namespace integration { 28 namespace awskms { 29 30 // AwsKmsAead is an implementation of AEAD that forwards encryption/decryption 31 // requests to a key managed by the AWS KMS (https://aws.amazon.com/kms). 32 class AwsKmsAead : public Aead { 33 public: 34 // Move only. 35 AwsKmsAead(AwsKmsAead&& other) = default; 36 AwsKmsAead& operator=(AwsKmsAead&& other) = default; 37 AwsKmsAead(const AwsKmsAead&) = delete; 38 AwsKmsAead& operator=(const AwsKmsAead&) = delete; 39 40 // Creates a new AwsKmsAead that is bound to the key specified in `key_arn`, 41 // and that uses the given client when communicating with the KMS. 42 static crypto::tink::util::StatusOr<std::unique_ptr<Aead>> New( 43 absl::string_view key_arn, 44 std::shared_ptr<Aws::KMS::KMSClient> aws_client); 45 46 crypto::tink::util::StatusOr<std::string> Encrypt( 47 absl::string_view plaintext, 48 absl::string_view associated_data) const override; 49 50 crypto::tink::util::StatusOr<std::string> Decrypt( 51 absl::string_view ciphertext, 52 absl::string_view associated_data) const override; 53 54 private: AwsKmsAead(absl::string_view key_arn,std::shared_ptr<Aws::KMS::KMSClient> aws_client)55 AwsKmsAead(absl::string_view key_arn, 56 std::shared_ptr<Aws::KMS::KMSClient> aws_client) 57 : key_arn_(key_arn), aws_client_(aws_client) {} 58 59 std::string key_arn_; // The location of a crypto key in AWS KMS. 60 std::shared_ptr<Aws::KMS::KMSClient> aws_client_; 61 }; 62 63 } // namespace awskms 64 } // namespace integration 65 } // namespace tink 66 } // namespace crypto 67 68 #endif // TINK_INTEGRATION_AWSKMS_AWS_KMS_AEAD_H_ 69