d29372909d
Fixes a secure buffer addressing offset error in the Widevine CENC drm engine. bug: 8667527 Merges the following from Widevine CDM repository: Allow specification of offset into secure buffer https://widevine-internal-review.googlesource.com/#/c/5100/ Update WVCryptoPlugin to Pass Output Offset as a Separate Parameter https://widevine-internal-review.googlesource.com/#/c/5120/ Add offset to secure data buffer in OEMCrypto DecryptCTR https://widevine-internal-review.googlesource.com/#/c/5110/ Change-Id: Ic3e4b35304c8fbae4aebe4c495285eb787e8c205
104 lines
3.5 KiB
C++
104 lines
3.5 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 "crypto_key.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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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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explicit CryptoSession(const std::string& sname);
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~CryptoSession();
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bool Open();
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void Close();
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bool IsValid() { return valid_; }
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bool IsOpen() { return open_; }
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bool SuccessStatus();
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CryptoResult session_status() { return session_status_; }
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CryptoSessionId oec_session_id() { return oec_session_id_; }
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CdmSessionId cdm_session_id() { return cdm_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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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,
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const std::string& signature,
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const std::string& mac_key_iv,
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const std::string& mac_key,
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int num_keys,
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const CryptoKey* key_array);
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bool LoadCertificatePrivateKey(std::string& wrapped_key);
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bool RefreshKeys(const std::string& message,
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const std::string& signature,
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int num_keys,
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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 GenerateSignature(const std::string& message,
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std::string* signature);
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bool RewrapDeviceRSAKey(const std::string& message,
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const uint32_t* nonce,
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const uint8_t* enc_rsa_key,
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size_t enc_rsa_key_length,
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const uint8_t* enc_rsa_key_iv,
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uint8_t* wrapped_rsa_key,
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size_t* wrapped_rsa_key_length);
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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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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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private:
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static const size_t kSignatureSize = 32; // size for HMAC-SHA256 signature
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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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size_t GetOffset(std::string message, std::string field);
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bool SetDestinationBufferType();
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bool valid_;
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bool open_;
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CdmSessionId cdm_session_id_;
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CryptoSessionId oec_session_id_;
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CryptoResult session_status_;
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OEMCryptoBufferType destination_buffer_type_;
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bool is_destination_buffer_type_valid_;
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CryptoKeyMap keys_;
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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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