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/*
* Copyright (C) 2014 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 "ClearKeyCryptoPlugin"
#include <utils/Log.h>
#include <media/stagefright/MediaErrors.h>
#include <utils/String8.h>
#include "Session.h"
#include "AesCtrDecryptor.h"
#include "InitDataParser.h"
#include "JsonWebKey.h"
namespace clearkeydrm {
using android::Mutex;
using android::String8;
using android::Vector;
using android::status_t;
status_t Session::getKeyRequest(
const Vector<uint8_t>& initData,
const String8& initDataType,
Vector<uint8_t>* keyRequest) const {
InitDataParser parser;
return parser.parse(initData, initDataType, keyRequest);
}
status_t Session::provideKeyResponse(const Vector<uint8_t>& response) {
String8 responseString(
reinterpret_cast<const char*>(response.array()), response.size());
KeyMap keys;
Mutex::Autolock lock(mMapLock);
JsonWebKey parser;
if (parser.extractKeysFromJsonWebKeySet(responseString, &keys)) {
for (size_t i = 0; i < keys.size(); ++i) {
const KeyMap::key_type& keyId = keys.keyAt(i);
const KeyMap::value_type& key = keys.valueAt(i);
mKeyMap.add(keyId, key);
}
return android::OK;
} else {
return android::ERROR_DRM_UNKNOWN;
}
}
status_t Session::decrypt(
const KeyId keyId, const Iv iv, const void* source,
void* destination, const SubSample* subSamples,
size_t numSubSamples, size_t* bytesDecryptedOut) {
Mutex::Autolock lock(mMapLock);
Vector<uint8_t> keyIdVector;
keyIdVector.appendArray(keyId, kBlockSize);
if (mKeyMap.indexOfKey(keyIdVector) < 0) {
return android::ERROR_DRM_NO_LICENSE;
}
const Vector<uint8_t>& key = mKeyMap.valueFor(keyIdVector);
AesCtrDecryptor decryptor;
return decryptor.decrypt(
key, iv,
reinterpret_cast<const uint8_t*>(source),
reinterpret_cast<uint8_t*>(destination), subSamples,
numSubSamples, bytesDecryptedOut);
}
} // namespace clearkeydrm
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