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