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 "core/fxcrt/fx_string.h" 11 #include "core/fxcrt/fx_system.h" 12 13 #define FXCIPHER_NONE 0 14 #define FXCIPHER_RC4 1 15 #define FXCIPHER_AES 2 16 #define FXCIPHER_AES2 3 17 18 #define PDF_ENCRYPT_CONTENT 0 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(CPDF_Parser* pParser, CPDF_Dictionary* pEncryptDict); 31 uint32_t GetPermissions(); 32 bool GetCryptInfo(int& cipher, const uint8_t*& buffer, int& keylen); 33 bool IsMetadataEncrypted() const; 34 CPDF_CryptoHandler* CreateCryptoHandler(); 35 36 void OnCreate(CPDF_Dictionary* pEncryptDict, 37 CPDF_Array* pIdArray, 38 const uint8_t* user_pass, 39 uint32_t user_size, 40 const uint8_t* owner_pass, 41 uint32_t owner_size, 42 uint32_t type = PDF_ENCRYPT_CONTENT); 43 44 void OnCreate(CPDF_Dictionary* pEncryptDict, 45 CPDF_Array* pIdArray, 46 const uint8_t* user_pass, 47 uint32_t user_size, 48 uint32_t type = PDF_ENCRYPT_CONTENT); 49 50 CFX_ByteString GetUserPassword(const uint8_t* owner_pass, 51 uint32_t pass_size, 52 int32_t key_len); 53 bool CheckPassword(const uint8_t* password, 54 uint32_t pass_size, 55 bool bOwner, 56 uint8_t* key, 57 int key_len); 58 59 private: 60 bool LoadDict(CPDF_Dictionary* pEncryptDict); 61 bool LoadDict(CPDF_Dictionary* pEncryptDict, 62 uint32_t type, 63 int& cipher, 64 int& key_len); 65 66 bool CheckUserPassword(const uint8_t* password, 67 uint32_t pass_size, 68 bool bIgnoreEncryptMeta, 69 uint8_t* key, 70 int32_t key_len); 71 72 bool CheckOwnerPassword(const uint8_t* password, 73 uint32_t pass_size, 74 uint8_t* key, 75 int32_t key_len); 76 bool AES256_CheckPassword(const uint8_t* password, 77 uint32_t size, 78 bool bOwner, 79 uint8_t* key); 80 void AES256_SetPassword(CPDF_Dictionary* pEncryptDict, 81 const uint8_t* password, 82 uint32_t size, 83 bool bOwner, 84 const uint8_t* key); 85 void AES256_SetPerms(CPDF_Dictionary* pEncryptDict, 86 uint32_t permission, 87 bool bEncryptMetadata, 88 const uint8_t* key); 89 void OnCreate(CPDF_Dictionary* pEncryptDict, 90 CPDF_Array* pIdArray, 91 const uint8_t* user_pass, 92 uint32_t user_size, 93 const uint8_t* owner_pass, 94 uint32_t owner_size, 95 bool bDefault, 96 uint32_t type); 97 bool CheckSecurity(int32_t key_len); 98 99 int m_Version; 100 int m_Revision; 101 CPDF_Parser* m_pParser; 102 CPDF_Dictionary* m_pEncryptDict; 103 uint32_t m_Permissions; 104 int m_Cipher; 105 uint8_t m_EncryptKey[32]; 106 int m_KeyLen; 107 bool m_bOwnerUnlocked; 108 }; 109 110 #endif // CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_ 111