1 // Copyright 2022 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 #include "tink/daead/failing_daead.h"
17
18 #include <memory>
19 #include <string>
20 #include <utility>
21
22 namespace crypto {
23 namespace tink {
24 namespace {
25
26 // A deterministic AEAD that always return a kInternal status on API calls.
27 class AlwaysFailDeterministicAead : public DeterministicAead {
28 public:
AlwaysFailDeterministicAead(std::string message)29 explicit AlwaysFailDeterministicAead(std::string message)
30 : message_(std::move(message)) {}
31
EncryptDeterministically(absl::string_view plaintext,absl::string_view associated_data) const32 util::StatusOr<std::string> EncryptDeterministically(
33 absl::string_view plaintext,
34 absl::string_view associated_data) const override {
35 return util::Status(
36 absl::StatusCode::kInternal,
37 absl::StrCat(
38 "AlwaysFailDeterministicAead will always fail on encrypt (msg=",
39 message_, ")"));
40 }
41
DecryptDeterministically(absl::string_view ciphertext,absl::string_view associated_data) const42 util::StatusOr<std::string> DecryptDeterministically(
43 absl::string_view ciphertext,
44 absl::string_view associated_data) const override {
45 return util::Status(
46 absl::StatusCode::kInternal,
47 absl::StrCat(
48 "AlwaysFailDeterministicAead will always fail on decrypt (msg=",
49 message_, ")"));
50 }
51
52 private:
53 const std::string message_;
54 };
55
56 } // namespace
57
CreateAlwaysFailingDeterministicAead(std::string message)58 std::unique_ptr<DeterministicAead> CreateAlwaysFailingDeterministicAead(
59 std::string message) {
60 return absl::make_unique<AlwaysFailDeterministicAead>(std::move(message));
61 }
62
63 } // namespace tink
64 } // namespace crypto
65