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_CRYPTO_HANDLER_H_ 8 #define CORE_FPDFAPI_PARSER_CPDF_CRYPTO_HANDLER_H_ 9 10 #include <memory> 11 12 #include "core/fdrm/crypto/fx_crypt.h" 13 #include "core/fxcrt/cfx_binarybuf.h" 14 #include "core/fxcrt/fx_memory.h" 15 #include "core/fxcrt/fx_string.h" 16 #include "core/fxcrt/fx_system.h" 17 #include "core/fxcrt/retain_ptr.h" 18 19 class CPDF_Dictionary; 20 class CPDF_Object; 21 class CPDF_SecurityHandler; 22 23 class CPDF_CryptoHandler { 24 public: 25 CPDF_CryptoHandler(int cipher, const uint8_t* key, int keylen); 26 ~CPDF_CryptoHandler(); 27 28 static bool IsSignatureDictionary(const CPDF_Dictionary* dictionary); 29 30 std::unique_ptr<CPDF_Object> DecryptObjectTree( 31 std::unique_ptr<CPDF_Object> object); 32 33 uint32_t EncryptGetSize(uint32_t objnum, 34 uint32_t version, 35 const uint8_t* src_buf, 36 uint32_t src_size); 37 bool EncryptContent(uint32_t objnum, 38 uint32_t version, 39 const uint8_t* src_buf, 40 uint32_t src_size, 41 uint8_t* dest_buf, 42 uint32_t& dest_size); 43 44 bool IsCipherAES() const; 45 46 private: 47 uint32_t DecryptGetSize(uint32_t src_size); 48 void* DecryptStart(uint32_t objnum, uint32_t gennum); 49 ByteString Decrypt(uint32_t objnum, uint32_t gennum, const ByteString& str); 50 bool DecryptStream(void* context, 51 const uint8_t* src_buf, 52 uint32_t src_size, 53 CFX_BinaryBuf& dest_buf); 54 bool DecryptFinish(void* context, CFX_BinaryBuf& dest_buf); 55 56 void PopulateKey(uint32_t objnum, uint32_t gennum, uint8_t* key); 57 void CryptBlock(bool bEncrypt, 58 uint32_t objnum, 59 uint32_t gennum, 60 const uint8_t* src_buf, 61 uint32_t src_size, 62 uint8_t* dest_buf, 63 uint32_t& dest_size); 64 void* CryptStart(uint32_t objnum, uint32_t gennum, bool bEncrypt); 65 bool CryptStream(void* context, 66 const uint8_t* src_buf, 67 uint32_t src_size, 68 CFX_BinaryBuf& dest_buf, 69 bool bEncrypt); 70 bool CryptFinish(void* context, CFX_BinaryBuf& dest_buf, bool bEncrypt); 71 72 uint8_t m_EncryptKey[32]; 73 int m_KeyLen; 74 int m_Cipher; 75 std::unique_ptr<CRYPT_aes_context, FxFreeDeleter> m_pAESContext; 76 }; 77 78 #endif // CORE_FPDFAPI_PARSER_CPDF_CRYPTO_HANDLER_H_ 79
