1 // Copyright 2016 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_ 8 #define CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_ 9 10 #include <memory> 11 12 #include "core/fxcrt/fx_string.h" 13 #include "core/fxcrt/fx_system.h" 14 15 #define FXCIPHER_NONE 0 16 #define FXCIPHER_RC4 1 17 #define FXCIPHER_AES 2 18 #define FXCIPHER_AES2 3 19 20 class CPDF_Array; 21 class CPDF_CryptoHandler; 22 class CPDF_Dictionary; 23 class CPDF_Parser; 24 25 class CPDF_SecurityHandler { 26 public: 27 CPDF_SecurityHandler(); 28 ~CPDF_SecurityHandler(); 29 30 bool OnInit(const CPDF_Dictionary* pEncryptDict, 31 const CPDF_Array* pIdArray, 32 const ByteString& password); 33 void OnCreate(CPDF_Dictionary* pEncryptDict, 34 const CPDF_Array* pIdArray, 35 const ByteString& user_password, 36 const ByteString& owner_password); 37 void OnCreate(CPDF_Dictionary* pEncryptDict, 38 const CPDF_Array* pIdArray, 39 const ByteString& user_password); 40 41 uint32_t GetPermissions() const; 42 bool IsMetadataEncrypted() const; 43 44 ByteString GetUserPassword(const ByteString& owner_password, 45 int32_t key_len) const; 46 bool CheckPassword(const ByteString& user_password, 47 bool bOwner, 48 uint8_t* key, 49 int key_len); 50 51 CPDF_CryptoHandler* GetCryptoHandler() const { 52 return m_pCryptoHandler.get(); 53 } 54 55 private: 56 bool LoadDict(const CPDF_Dictionary* pEncryptDict); 57 bool LoadDict(const CPDF_Dictionary* pEncryptDict, 58 int& cipher, 59 int& key_len); 60 61 bool CheckUserPassword(const ByteString& password, 62 bool bIgnoreEncryptMeta, 63 uint8_t* key, 64 int32_t key_len); 65 66 bool CheckOwnerPassword(const ByteString& password, 67 uint8_t* key, 68 int32_t key_len); 69 bool AES256_CheckPassword(const ByteString& password, 70 bool bOwner, 71 uint8_t* key); 72 void AES256_SetPassword(CPDF_Dictionary* pEncryptDict, 73 const ByteString& password, 74 bool bOwner, 75 const uint8_t* key); 76 void AES256_SetPerms(CPDF_Dictionary* pEncryptDict, 77 uint32_t permission, 78 bool bEncryptMetadata, 79 const uint8_t* key); 80 void OnCreateInternal(CPDF_Dictionary* pEncryptDict, 81 const CPDF_Array* pIdArray, 82 const ByteString& user_password, 83 const ByteString& owner_password, 84 bool bDefault); 85 bool CheckSecurity(const ByteString& password); 86 87 void InitCryptoHandler(); 88 89 int m_Version; 90 int m_Revision; 91 UnownedPtr<const CPDF_Dictionary> m_pEncryptDict; 92 ByteString m_FileId; 93 uint32_t m_Permissions; 94 int m_Cipher; 95 uint8_t m_EncryptKey[32]; 96 int m_KeyLen; 97 bool m_bOwnerUnlocked; 98 std::unique_ptr<CPDF_CryptoHandler> m_pCryptoHandler; 99 }; 100 101 #endif // CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_ 102
