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/*
* Copyright (C) 2018 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.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "hidl_ClearKeySession"
#include <utils/Log.h>
#include "Session.h"
#include "Utils.h"
#include "AesCtrDecryptor.h"
#include "InitDataParser.h"
#include "JsonWebKey.h"
namespace android {
namespace hardware {
namespace drm {
namespace V1_1 {
namespace clearkey {
using ::android::hardware::drm::V1_0::KeyValue;
using ::android::hardware::drm::V1_0::Status;
using ::android::hardware::drm::V1_0::SubSample;
using ::android::hardware::Return;
using ::android::sp;
using android::Mutex;
Status Session::getKeyRequest(
const std::vector<uint8_t>& initData,
const std::string& mimeType,
std::vector<uint8_t>* keyRequest) const {
InitDataParser parser;
return parser.parse(initData, mimeType, keyRequest);
}
Status Session::provideKeyResponse(const std::vector<uint8_t>& response) {
std::string responseString(
reinterpret_cast<const char*>(response.data()), response.size());
KeyMap keys;
Mutex::Autolock lock(mMapLock);
JsonWebKey parser;
if (parser.extractKeysFromJsonWebKeySet(responseString, &keys)) {
for (auto &key : keys) {
std::string first(key.first.begin(), key.first.end());
std::string second(key.second.begin(), key.second.end());
mKeyMap.insert(std::pair<std::vector<uint8_t>,
std::vector<uint8_t> >(key.first, key.second));
}
return Status::OK;
} else {
return Status::ERROR_DRM_UNKNOWN;
}
}
Status Session::decrypt(
const KeyId keyId, const Iv iv, const uint8_t* srcPtr,
uint8_t* destPtr, const std::vector<SubSample> subSamples,
size_t* bytesDecryptedOut) {
Mutex::Autolock lock(mMapLock);
std::vector<uint8_t> keyIdVector;
keyIdVector.clear();
keyIdVector.insert(keyIdVector.end(), keyId, keyId + kBlockSize);
std::map<std::vector<uint8_t>, std::vector<uint8_t> >::iterator itr;
itr = mKeyMap.find(keyIdVector);
if (itr == mKeyMap.end()) {
return Status::ERROR_DRM_NO_LICENSE;
}
AesCtrDecryptor decryptor;
return decryptor.decrypt(
itr->second /*key*/, iv, srcPtr, destPtr, subSamples,
subSamples.size(), bytesDecryptedOut);
}
} // namespace clearkey
} // namespace V1_1
} // namespace drm
} // namespace hardware
} // namespace android
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