0190f99fb3
Android development of the widevine CDM has been done on the jb-mr2 branch of the cdm code base. This CL contains a merge of that jb-mr2 work to CDM master, and also reflects the evolution of the common Modular DRM code base since jb-mr2 branched. Change-Id: I1d7e1a12d092c00044a4298261146cb97808d4ef
112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// OEMCrypto Client - wrapper class for C-style OEMCrypto interface
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//
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#ifndef CDM_BASE_CRYPTO_SESSSION_H_
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#define CDM_BASE_CRYPTO_SESSSION_H_
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#include <string>
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#include <map>
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#include "lock.h"
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#include "OEMCryptoCENC.h"
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#include "wv_cdm_types.h"
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namespace wvcdm {
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class CryptoKey;
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typedef std::map<CryptoKeyId, CryptoKey*> CryptoKeyMap;
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class CryptoSession {
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public:
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CryptoSession();
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~CryptoSession();
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typedef enum {
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kSecurityLevelUninitialized,
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kSecurityLevelL1,
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kSecurityLevelL2,
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kSecurityLevelL3,
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kSecurityLevelUnknown
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} SecurityLevel;
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bool ValidateKeybox();
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bool GetToken(std::string* token);
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SecurityLevel GetSecurityLevel();
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bool GetDeviceUniqueId(std::string* device_id);
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bool GetSystemId(uint32_t* system_id);
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bool GetProvisioningId(std::string* provisioning_id);
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bool Open();
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void Close();
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bool IsOpen() { return open_; }
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CryptoSessionId oec_session_id() { return oec_session_id_; }
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// Key request/response
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void GenerateRequestId(std::string& req_id_str);
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bool PrepareRequest(const std::string& key_deriv_message,
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bool is_provisioning, std::string* signature);
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bool PrepareRenewalRequest(const std::string& message,
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std::string* signature);
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bool LoadKeys(const std::string& message, const std::string& signature,
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const std::string& mac_key_iv, const std::string& mac_key,
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int num_keys, const CryptoKey* key_array);
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bool LoadCertificatePrivateKey(std::string& wrapped_key);
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bool RefreshKeys(const std::string& message, const std::string& signature,
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int num_keys, const CryptoKey* key_array);
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bool GenerateNonce(uint32_t* nonce);
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bool GenerateDerivedKeys(const std::string& message);
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bool GenerateDerivedKeys(const std::string& message,
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const std::string& session_key);
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bool RewrapDeviceRSAKey(const std::string& message,
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const std::string& signature,
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const std::string& nonce,
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const std::string& enc_rsa_key,
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const std::string& rsa_key_iv,
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std::string* wrapped_rsa_key);
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// Media data path
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bool SelectKey(const std::string& key_id);
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CdmResponseType Decrypt(bool is_encrypted,
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bool is_secure,
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const uint8_t* encrypt_buffer,
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size_t encrypt_length,
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const std::vector<uint8_t>& iv,
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size_t block_offset,
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void* decrypt_buffer,
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size_t decrypt_buffer_offset,
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bool is_video);
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bool GetRandom(uint8_t* random_data, size_t data_length);
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private:
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void Init();
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void Terminate();
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void GenerateMacContext(const std::string& input_context,
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std::string* deriv_context);
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void GenerateEncryptContext(const std::string& input_context,
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std::string* deriv_context);
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bool GenerateSignature(const std::string& message, bool use_rsa,
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std::string* signature);
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size_t GetOffset(std::string message, std::string field);
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bool SetDestinationBufferType();
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static const size_t kSignatureSize = 32; // size for HMAC-SHA256 signature
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static Lock crypto_lock_;
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static bool initialized_;
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static int session_count_;
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bool open_;
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CryptoSessionId oec_session_id_;
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OEMCryptoBufferType destination_buffer_type_;
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bool is_destination_buffer_type_valid_;
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CORE_DISALLOW_COPY_AND_ASSIGN(CryptoSession);
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};
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}; // namespace wvcdm
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#endif // CDM_BASE_CRYPTO_SESSSION_H_
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