86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "ClearKeySession"
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#include <utils/Log.h>
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#include <media/stagefright/MediaErrors.h>
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#include <utils/String8.h>
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#include "Session.h"
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#include "AesCtrDecryptor.h"
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#include "InitDataParser.h"
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#include "JsonWebKey.h"
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namespace clearkeydrm {
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using android::Mutex;
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using android::String8;
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using android::Vector;
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using android::status_t;
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status_t Session::getKeyRequest(
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const Vector<uint8_t>& initData,
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const String8& mimeType,
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Vector<uint8_t>* keyRequest) const {
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InitDataParser parser;
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return parser.parse(initData, mimeType, keyRequest);
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}
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status_t Session::provideKeyResponse(const Vector<uint8_t>& response) {
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String8 responseString(
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reinterpret_cast<const char*>(response.array()), response.size());
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KeyMap keys;
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Mutex::Autolock lock(mMapLock);
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JsonWebKey parser;
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if (parser.extractKeysFromJsonWebKeySet(responseString, &keys)) {
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for (size_t i = 0; i < keys.size(); ++i) {
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const KeyMap::key_type& keyId = keys.keyAt(i);
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const KeyMap::value_type& key = keys.valueAt(i);
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mKeyMap.add(keyId, key);
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}
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return android::OK;
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} else {
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return android::ERROR_DRM_UNKNOWN;
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}
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}
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status_t Session::decrypt(
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const KeyId keyId, const Iv iv, const void* source,
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void* destination, const SubSample* subSamples,
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size_t numSubSamples, size_t* bytesDecryptedOut) {
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Mutex::Autolock lock(mMapLock);
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Vector<uint8_t> keyIdVector;
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keyIdVector.appendArray(keyId, kBlockSize);
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if (mKeyMap.indexOfKey(keyIdVector) < 0) {
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return android::ERROR_DRM_NO_LICENSE;
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}
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const Vector<uint8_t>& key = mKeyMap.valueFor(keyIdVector);
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AesCtrDecryptor decryptor;
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return decryptor.decrypt(
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key, iv,
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reinterpret_cast<const uint8_t*>(source),
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reinterpret_cast<uint8_t*>(destination), subSamples,
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numSubSamples, bytesDecryptedOut);
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}
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} // namespace clearkeydrm
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