1 // Copyright 2019 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 #include "tink/subtle/nonce_based_streaming_aead.h" 18 19 #include <memory> 20 #include <utility> 21 22 #include "absl/strings/string_view.h" 23 #include "tink/input_stream.h" 24 #include "tink/output_stream.h" 25 #include "tink/random_access_stream.h" 26 #include "tink/streaming_aead.h" 27 #include "tink/subtle/decrypting_random_access_stream.h" 28 #include "tink/subtle/stream_segment_decrypter.h" 29 #include "tink/subtle/stream_segment_encrypter.h" 30 #include "tink/subtle/streaming_aead_decrypting_stream.h" 31 #include "tink/subtle/streaming_aead_encrypting_stream.h" 32 #include "tink/util/statusor.h" 33 34 namespace crypto { 35 namespace tink { 36 namespace subtle { 37 38 crypto::tink::util::StatusOr<std::unique_ptr<crypto::tink::OutputStream>> NewEncryptingStream(std::unique_ptr<crypto::tink::OutputStream> ciphertext_destination,absl::string_view associated_data) const39 NonceBasedStreamingAead::NewEncryptingStream( 40 std::unique_ptr<crypto::tink::OutputStream> ciphertext_destination, 41 absl::string_view associated_data) const { 42 auto segment_encrypter_result = NewSegmentEncrypter(associated_data); 43 if (!segment_encrypter_result.ok()) return segment_encrypter_result.status(); 44 return StreamingAeadEncryptingStream::New( 45 std::move(segment_encrypter_result.value()), 46 std::move(ciphertext_destination)); 47 } 48 49 crypto::tink::util::StatusOr<std::unique_ptr<crypto::tink::InputStream>> NewDecryptingStream(std::unique_ptr<crypto::tink::InputStream> ciphertext_source,absl::string_view associated_data) const50 NonceBasedStreamingAead::NewDecryptingStream( 51 std::unique_ptr<crypto::tink::InputStream> ciphertext_source, 52 absl::string_view associated_data) const { 53 auto segment_decrypter_result = NewSegmentDecrypter(associated_data); 54 if (!segment_decrypter_result.ok()) return segment_decrypter_result.status(); 55 return StreamingAeadDecryptingStream::New( 56 std::move(segment_decrypter_result.value()), 57 std::move(ciphertext_source)); 58 } 59 60 crypto::tink::util::StatusOr<std::unique_ptr<crypto::tink::RandomAccessStream>> NewDecryptingRandomAccessStream(std::unique_ptr<crypto::tink::RandomAccessStream> ciphertext_source,absl::string_view associated_data) const61 NonceBasedStreamingAead::NewDecryptingRandomAccessStream( 62 std::unique_ptr<crypto::tink::RandomAccessStream> ciphertext_source, 63 absl::string_view associated_data) const { 64 auto segment_decrypter_result = NewSegmentDecrypter(associated_data); 65 if (!segment_decrypter_result.ok()) return segment_decrypter_result.status(); 66 return DecryptingRandomAccessStream::New( 67 std::move(segment_decrypter_result.value()), 68 std::move(ciphertext_source)); 69 } 70 71 } // namespace subtle 72 } // namespace tink 73 } // namespace crypto 74