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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 "Log.h"
#include "IncidentKeyStore.h"
#include <sys/stat.h>
static constexpr size_t AES_KEY_BYTES = 32;
static constexpr size_t GCM_MAC_BYTES = 16;
constexpr char kKeyname[] = "IncidentKey";
namespace android {
namespace os {
namespace incidentd {
using namespace keystore;
using std::string;
IncidentKeyStore& IncidentKeyStore::getInstance() {
static IncidentKeyStore sInstance(new keystore::KeystoreClientImpl);
return sInstance;
}
bool IncidentKeyStore::encrypt(const string& data, int32_t flags, string* output) {
std::lock_guard<std::mutex> lock(mMutex);
if (data.empty()) {
ALOGW("IncidentKeyStore: Encrypt empty data?!");
return false;
}
if (!mClient->doesKeyExist(kKeyname)) {
auto gen_result = generateKeyLocked(kKeyname, 0);
if (!gen_result.isOk()) {
ALOGE("IncidentKeyStore: Key generate failed.");
return false;
}
}
if (!mClient->encryptWithAuthentication(kKeyname, data, flags, output)) {
ALOGE("IncidentKeyStore: Encryption failed.");
return false;
}
return true;
}
bool IncidentKeyStore::decrypt(const std::string& input, string* output) {
std::lock_guard<std::mutex> lock(mMutex);
if (input.empty()) {
ALOGE("IncidentKeyStore: Decrypt empty input?");
return false;
}
if (!mClient->decryptWithAuthentication(kKeyname, input, output)) {
ALOGE("IncidentKeyStore: Decryption failed.");
return false;
}
return true;
}
KeyStoreNativeReturnCode IncidentKeyStore::generateKeyLocked(const std::string& name,
int32_t flags) {
auto paramBuilder = AuthorizationSetBuilder()
.AesEncryptionKey(AES_KEY_BYTES * 8)
.GcmModeMinMacLen(GCM_MAC_BYTES * 8)
.Authorization(TAG_NO_AUTH_REQUIRED);
AuthorizationSet hardware_enforced_characteristics;
AuthorizationSet software_enforced_characteristics;
return mClient->generateKey(name, paramBuilder, flags, &hardware_enforced_characteristics,
&software_enforced_characteristics);
}
} // namespace incidentd
} // namespace os
} // namespace android
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