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/mac/failing_mac.h"
17
18 #include <memory>
19 #include <string>
20 #include <utility>
21
22 #include "absl/strings/string_view.h"
23
24 namespace crypto {
25 namespace tink {
26 namespace {
27
28 // A MAC that always returns a kInternal status on API calls.
29 class AlwaysFailMac : public Mac {
30 public:
AlwaysFailMac(std::string message)31 explicit AlwaysFailMac(std::string message) : message_(std::move(message)) {}
32
ComputeMac(absl::string_view) const33 util::StatusOr<std::string> ComputeMac(
34 absl::string_view /*data*/) const override {
35 return util::Status(
36 absl::StatusCode::kInternal,
37 absl::StrCat("AlwaysFailMac will always fail on ComputeMac (msg=",
38 message_, ")"));
39 }
40
VerifyMac(absl::string_view,absl::string_view) const41 util::Status VerifyMac(absl::string_view /*mac_value*/,
42 absl::string_view /*data*/) const override {
43 return util::Status(
44 absl::StatusCode::kInternal,
45 absl::StrCat("AlwaysFailMac will always fail on VerifyMac (msg=",
46 message_, ")"));
47 }
48
49 private:
50 const std::string message_;
51 };
52
53 } // namespace
54
CreateAlwaysFailingMac(std::string message)55 std::unique_ptr<Mac> CreateAlwaysFailingMac(std::string message) {
56 return absl::make_unique<AlwaysFailMac>(std::move(message));
57 }
58
59 } // namespace tink
60 } // namespace crypto
61