95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
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// source code may only be used and distributed under the Widevine Master
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// License Agreement.
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#ifndef WIDEVINE_CAS_SESSION_H
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#define WIDEVINE_CAS_SESSION_H
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#include <memory>
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#include <mutex>
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#include <set>
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#include <string>
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#include "cas_types.h"
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#include "crypto_session.h"
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#include "ecm_parser.h"
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#include "media_cas.pb.h"
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namespace wvcas {
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class WidevineCasSession;
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typedef std::shared_ptr<WidevineCasSession> CasSessionPtr;
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class CasKeySlotData {
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public:
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CasKeySlotData() {}
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~CasKeySlotData() {}
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KeySlot& operator[](KeySlotId slot_id);
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const KeySlot& operator[](KeySlotId slot_id) const;
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private:
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KeySlot keys_[2]; // Odd and even key slots.
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};
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enum class ScramblingControl {
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kScrambling_Unscrambled = 0,
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kScrambling_Reserved = 1,
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kScrambling_EvenKey = 2,
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kScrambling_OddKey = 3,
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};
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// WidevineCasSession represents an encryption context for a single ECM key
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// stream. It processes ECMs for the stream and maintains the key information.
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class WidevineCasSession {
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public:
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WidevineCasSession() {}
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virtual ~WidevineCasSession();
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CasStatus initialize(std::shared_ptr<CryptoSession> crypto_session,
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CasEventListener* event_listener, uint32_t* session_id);
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// Process an ecm and extract the key slot data. Extracted data will be used
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// to update |current_ecm_| and |entitlement_key_id_| and |keys_|.
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// |parental_control_age| (if non-zero) must be greater or equal to the
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// age_restriction field specified in |ecm|. Otherwise, ECM will not be
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// processed and error will be returned.
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// |license_group_id| if non empty, processEcm will decrypt content keys that
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// are specified by |license_group_id|.
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virtual CasStatus processEcm(const CasEcm& ecm, uint8_t parental_control_age,
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const std::string& license_group_id);
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// Returns the security level retrieved from OEMCrypto.
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const char* securityLevel();
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// Returns current ecm age restriction value.
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uint8_t GetEcmAgeRestriction() { return ecm_age_restriction_; }
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WidevineCasSession(const WidevineCasSession&) = delete;
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WidevineCasSession& operator=(const WidevineCasSession&) = delete;
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private:
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// Creates an EcmParser.
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virtual std::unique_ptr<EcmParser> getEcmParser(const CasEcm& ecm) const;
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CasKeySlotData keys_; // Odd and even key slots.
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std::string entitlement_key_id_;
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std::mutex lock_;
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CasEcm current_ecm_;
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uint8_t ecm_age_restriction_ = 0;
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std::shared_ptr<CryptoSession> crypto_session_;
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// Id of the entitled key session in OEMCrypto associated with this session.
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uint32_t key_session_id_;
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CasEventListener* event_listener_ = nullptr;
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// Fingerprinting events sent in processing last ECM/EMM. Used to avoid
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// sending a same event again.
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std::vector<uint8_t> last_fingerprinting_message_;
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// Service blocking events sent in processing last ECM/EMM. Used to avoid
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// sending a same event again.
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std::vector<uint8_t> last_service_blocking_message_;
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};
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} // namespace wvcas
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#endif // WIDEVINE_CAS_SESSION_H
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