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/*
* Copyright (C) 2017 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.
*/
#ifndef CLEARKEY_SESSION_LIBRARY_H_
#define CLEARKEY_SESSION_LIBRARY_H_
#include <media/cas/CasAPI.h>
#include <media/cas/DescramblerAPI.h>
#include <openssl/aes.h>
#include <utils/KeyedVector.h>
#include <utils/Mutex.h>
#include <utils/RefBase.h>
namespace android {
struct ABuffer;
namespace clearkeycas {
class KeyFetcher;
class ClearKeyCasSession : public RefBase {
public:
ssize_t decrypt(
bool secure,
DescramblerPlugin::ScramblingControl scramblingControl,
size_t numSubSamples,
const DescramblerPlugin::SubSample *subSamples,
const void *srcPtr,
void *dstPtr,
AString * /* errorDetailMsg */);
status_t updateECM(KeyFetcher *keyFetcher, void *ecm, size_t size);
private:
enum {
kNumKeys = 2,
};
struct KeyInfo {
bool valid;
AES_KEY contentKey;
};
sp<ABuffer> mEcmBuffer;
Mutex mKeyLock;
CasPlugin* mPlugin;
KeyInfo mKeyInfo[kNumKeys];
friend class ClearKeySessionLibrary;
explicit ClearKeyCasSession(CasPlugin *plugin);
virtual ~ClearKeyCasSession();
CasPlugin* getPlugin() const { return mPlugin; }
status_t decryptPayload(
const AES_KEY& key, size_t length, size_t offset, char* buffer) const;
DISALLOW_EVIL_CONSTRUCTORS(ClearKeyCasSession);
};
class ClearKeySessionLibrary {
public:
static ClearKeySessionLibrary* get();
status_t addSession(CasPlugin *plugin, CasSessionId *sessionId);
sp<ClearKeyCasSession> findSession(const CasSessionId& sessionId);
void destroySession(const CasSessionId& sessionId);
void destroyPlugin(CasPlugin *plugin);
private:
static Mutex sSingletonLock;
static ClearKeySessionLibrary* sSingleton;
Mutex mSessionsLock;
uint32_t mNextSessionId;
KeyedVector<CasSessionId, sp<ClearKeyCasSession>> mIDToSessionMap;
ClearKeySessionLibrary();
DISALLOW_EVIL_CONSTRUCTORS(ClearKeySessionLibrary);
};
} // namespace clearkeycas
} // namespace android
#endif // CLEARKEY_SESSION_LIBRARY_H_
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