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// Copyright 2019 Google LLC
//
// 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/core/key_type_manager.h"
#include <memory>
#include <string>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/status/status.h"
#include "tink/aead.h"
#include "tink/subtle/aes_gcm_boringssl.h"
#include "tink/subtle/random.h"
#include "tink/util/secret_data.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
#include "tink/util/test_matchers.h"
#include "tink/util/validation.h"
#include "proto/aes_gcm.pb.h"
namespace crypto {
namespace tink {
namespace {
using ::google::crypto::tink::AesGcmKey;
using ::google::crypto::tink::AesGcmKeyFormat;
using ::testing::Eq;
// A class for testing. We will construct objects from an aead key, so that we
// can check that a keymanager can handle multiple primitives. It is really
// insecure, as it does nothing except provide access to the key.
class AeadVariant {
public:
explicit AeadVariant(std::string s) : s_(s) {}
std::string get() { return s_; }
private:
std::string s_;
};
class ExampleKeyTypeManager : public KeyTypeManager<AesGcmKey, AesGcmKeyFormat,
List<Aead, AeadVariant>> {
public:
class AeadFactory : public PrimitiveFactory<Aead> {
public:
crypto::tink::util::StatusOr<std::unique_ptr<Aead>> Create(
const AesGcmKey& key) const override {
// Ignore the key and returned one with a fixed size for this test.
return {subtle::AesGcmBoringSsl::New(
util::SecretDataFromStringView(key.key_value()))};
}
};
class AeadVariantFactory : public PrimitiveFactory<AeadVariant> {
public:
crypto::tink::util::StatusOr<std::unique_ptr<AeadVariant>> Create(
const AesGcmKey& key) const override {
return absl::make_unique<AeadVariant>(key.key_value());
}
};
ExampleKeyTypeManager()
: KeyTypeManager(absl::make_unique<AeadFactory>(),
absl::make_unique<AeadVariantFactory>()) {}
google::crypto::tink::KeyData::KeyMaterialType key_material_type()
const override {
return google::crypto::tink::KeyData::SYMMETRIC;
}
uint32_t get_version() const override { return kVersion; }
const std::string& get_key_type() const override { return kKeyType; }
crypto::tink::util::Status ValidateKey(const AesGcmKey& key) const override {
return util::OkStatus();
}
crypto::tink::util::Status ValidateKeyFormat(
const AesGcmKeyFormat& key_format) const override {
return util::OkStatus();
}
crypto::tink::util::StatusOr<AesGcmKey> CreateKey(
const AesGcmKeyFormat& key_format) const override {
AesGcmKey result;
result.set_key_value(subtle::Random::GetRandomBytes(key_format.key_size()));
return result;
}
private:
static constexpr int kVersion = 0;
const std::string kKeyType = "myKeyType";
};
TEST(KeyManagerTest, CreateAead) {
AesGcmKeyFormat key_format;
key_format.set_key_size(16);
AesGcmKey key = ExampleKeyTypeManager().CreateKey(key_format).value();
std::unique_ptr<Aead> aead =
ExampleKeyTypeManager().GetPrimitive<Aead>(key).value();
std::string encryption = aead->Encrypt("Hi", "aad").value();
std::string decryption = aead->Decrypt(encryption, "aad").value();
EXPECT_THAT(decryption, Eq("Hi"));
}
TEST(KeyManagerTest, CreateAeadVariant) {
AesGcmKeyFormat key_format;
key_format.set_key_size(16);
AesGcmKey key = ExampleKeyTypeManager().CreateKey(key_format).value();
std::unique_ptr<AeadVariant> aead_variant =
ExampleKeyTypeManager().GetPrimitive<AeadVariant>(key).value();
EXPECT_THAT(aead_variant->get(), Eq(key.key_value()));
}
class NotRegistered {};
TEST(KeyManagerTest, CreateFails) {
auto failing =
ExampleKeyTypeManager().GetPrimitive<NotRegistered>(AesGcmKey());
EXPECT_THAT(failing.status(),
test::StatusIs(absl::StatusCode::kInvalidArgument));
}
class ExampleKeyTypeManagerWithoutFactory
: public KeyTypeManager<AesGcmKey, void, List<Aead, AeadVariant>> {
public:
class AeadFactory : public PrimitiveFactory<Aead> {
public:
crypto::tink::util::StatusOr<std::unique_ptr<Aead>> Create(
const AesGcmKey& key) const override {
// Ignore the key and returned one with a fixed size for this test.
return {subtle::AesGcmBoringSsl::New(
util::SecretDataFromStringView(key.key_value()))};
}
};
class AeadVariantFactory : public PrimitiveFactory<AeadVariant> {
public:
crypto::tink::util::StatusOr<std::unique_ptr<AeadVariant>> Create(
const AesGcmKey& key) const override {
return absl::make_unique<AeadVariant>(key.key_value());
}
};
ExampleKeyTypeManagerWithoutFactory()
: KeyTypeManager(absl::make_unique<AeadFactory>(),
absl::make_unique<AeadVariantFactory>()) {}
google::crypto::tink::KeyData::KeyMaterialType key_material_type()
const override {
return google::crypto::tink::KeyData::SYMMETRIC;
}
uint32_t get_version() const override { return kVersion; }
const std::string& get_key_type() const override { return key_type_; }
util::Status ValidateKey(const AesGcmKey& key) const override {
util::Status status = ValidateVersion(key.version(), kVersion);
if (!status.ok()) return status;
return ValidateAesKeySize(key.key_value().size());
}
private:
static constexpr int kVersion = 0;
const std::string key_type_ = "bla";
};
TEST(KeyManagerWithoutFactoryTest, CreateAead) {
AesGcmKeyFormat key_format;
key_format.set_key_size(16);
AesGcmKey key = ExampleKeyTypeManager().CreateKey(key_format).value();
std::unique_ptr<Aead> aead =
ExampleKeyTypeManagerWithoutFactory().GetPrimitive<Aead>(key).value();
std::string encryption = aead->Encrypt("Hi", "aad").value();
std::string decryption = aead->Decrypt(encryption, "aad").value();
EXPECT_THAT(decryption, Eq("Hi"));
}
TEST(KeyManagerWithoutFactoryTest, CreateAeadVariant) {
AesGcmKeyFormat key_format;
key_format.set_key_size(16);
AesGcmKey key = ExampleKeyTypeManager().CreateKey(key_format).value();
std::unique_ptr<AeadVariant> aead_variant =
ExampleKeyTypeManager().GetPrimitive<AeadVariant>(key).value();
EXPECT_THAT(aead_variant->get(), Eq(key.key_value()));
}
TEST(KeyManagerWithoutFactoryTest, CreateFails) {
auto failing =
ExampleKeyTypeManagerWithoutFactory().GetPrimitive<NotRegistered>(
AesGcmKey());
EXPECT_THAT(failing.status(),
test::StatusIs(absl::StatusCode::kInvalidArgument));
}
} // namespace
} // namespace tink
} // namespace crypto
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