// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////

#include "tink/mac/mac_set_wrapper.h"
#include "tink/mac.h"
#include "tink/primitive_set.h"
#include "tink/util/status.h"
#include "tink/util/test_util.h"
#include "gtest/gtest.h"

using crypto::tink::test::DummyMac;
using google::crypto::tink::OutputPrefixType;
using google::crypto::tink::Keyset;


namespace crypto {
namespace tink {
namespace {

class MacSetWrapperTest : public ::testing::Test {
 protected:
  void SetUp() override {
  }
  void TearDown() override {
  }
};

TEST_F(MacSetWrapperTest, testBasic) {
  { // mac_set is nullptr.
    auto mac_result = MacSetWrapper::NewMac(nullptr);
    EXPECT_FALSE(mac_result.ok());
    EXPECT_EQ(util::error::INTERNAL, mac_result.status().error_code());
    EXPECT_PRED_FORMAT2(testing::IsSubstring, "non-NULL",
                        mac_result.status().error_message());
  }

  { // mac_set has no primary primitive.
    std::unique_ptr<PrimitiveSet<Mac>> mac_set(new PrimitiveSet<Mac>());
    auto mac_result = MacSetWrapper::NewMac(std::move(mac_set));
    EXPECT_FALSE(mac_result.ok());
    EXPECT_EQ(util::error::INVALID_ARGUMENT, mac_result.status().error_code());
    EXPECT_PRED_FORMAT2(testing::IsSubstring, "no primary",
                        mac_result.status().error_message());
  }

  { // Correct mac_set;
    Keyset::Key* key;
    Keyset keyset;

    uint32_t key_id_0 = 1234543;
    key = keyset.add_key();
    key->set_output_prefix_type(OutputPrefixType::TINK);
    key->set_key_id(key_id_0);

    uint32_t key_id_1 = 726329;
    key = keyset.add_key();
    key->set_output_prefix_type(OutputPrefixType::LEGACY);
    key->set_key_id(key_id_1);

    uint32_t key_id_2 = 7213743;
    key = keyset.add_key();
    key->set_output_prefix_type(OutputPrefixType::TINK);
    key->set_key_id(key_id_2);

    std::string mac_name_0 = "mac0";
    std::string mac_name_1 = "mac1";
    std::string mac_name_2 = "mac2";
    std::unique_ptr<PrimitiveSet<Mac>> mac_set(new PrimitiveSet<Mac>());
    std::unique_ptr<Mac> mac(new DummyMac(mac_name_0));
    auto entry_result = mac_set->AddPrimitive(std::move(mac), keyset.key(0));
    ASSERT_TRUE(entry_result.ok());
    mac.reset(new DummyMac(mac_name_1));
    entry_result = mac_set->AddPrimitive(std::move(mac), keyset.key(1));
    ASSERT_TRUE(entry_result.ok());
    mac.reset(new DummyMac(mac_name_2));
    entry_result = mac_set->AddPrimitive(std::move(mac), keyset.key(2));
    ASSERT_TRUE(entry_result.ok());
    // The last key is the primary.
    mac_set->set_primary(entry_result.ValueOrDie());

    // Wrap mac_set and test the resulting Mac.
    auto mac_result = MacSetWrapper::NewMac(std::move(mac_set));
    EXPECT_TRUE(mac_result.ok()) << mac_result.status();
    mac = std::move(mac_result.ValueOrDie());
    std::string data = "some_data_for_mac";

    auto compute_mac_result = mac->ComputeMac(data);
    EXPECT_TRUE(compute_mac_result.ok()) << compute_mac_result.status();
    std::string mac_value = compute_mac_result.ValueOrDie();
    EXPECT_PRED_FORMAT2(testing::IsSubstring, mac_name_2, mac_value);

    util::Status status = mac->VerifyMac(mac_value, data);
    EXPECT_TRUE(status.ok()) << status;

    status = mac->VerifyMac("some bad mac", data);
    EXPECT_FALSE(status.ok());
    EXPECT_EQ(util::error::INVALID_ARGUMENT, status.error_code());
    EXPECT_PRED_FORMAT2(testing::IsSubstring, "verification failed",
                        status.error_message());
  }
}

}  // namespace
}  // namespace tink
}  // namespace crypto


int main(int ac, char* av[]) {
  testing::InitGoogleTest(&ac, av);
  return RUN_ALL_TESTS();
}