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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_
#define CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_
#include <memory>
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/fx_system.h"
#define FXCIPHER_NONE 0
#define FXCIPHER_RC4 1
#define FXCIPHER_AES 2
#define FXCIPHER_AES2 3
#define PDF_ENCRYPT_CONTENT 0
class CPDF_Array;
class CPDF_CryptoHandler;
class CPDF_Dictionary;
class CPDF_Parser;
class CPDF_SecurityHandler {
public:
CPDF_SecurityHandler();
~CPDF_SecurityHandler();
bool OnInit(const CPDF_Dictionary* pEncryptDict,
const CPDF_Array* pIdArray,
const ByteString& password);
uint32_t GetPermissions();
bool IsMetadataEncrypted() const;
void OnCreate(CPDF_Dictionary* pEncryptDict,
CPDF_Array* pIdArray,
const ByteString& user_password,
const ByteString& owner_password,
uint32_t type = PDF_ENCRYPT_CONTENT);
void OnCreate(CPDF_Dictionary* pEncryptDict,
CPDF_Array* pIdArray,
const ByteString& user_password,
uint32_t type = PDF_ENCRYPT_CONTENT);
ByteString GetUserPassword(const ByteString& owner_password, int32_t key_len);
bool CheckPassword(const ByteString& user_password,
bool bOwner,
uint8_t* key,
int key_len);
CPDF_CryptoHandler* GetCryptoHandler() const {
return m_pCryptoHandler.get();
}
private:
bool LoadDict(const CPDF_Dictionary* pEncryptDict);
bool LoadDict(const CPDF_Dictionary* pEncryptDict,
uint32_t type,
int& cipher,
int& key_len);
bool CheckUserPassword(const ByteString& password,
bool bIgnoreEncryptMeta,
uint8_t* key,
int32_t key_len);
bool CheckOwnerPassword(const ByteString& password,
uint8_t* key,
int32_t key_len);
bool AES256_CheckPassword(const ByteString& password,
bool bOwner,
uint8_t* key);
void AES256_SetPassword(CPDF_Dictionary* pEncryptDict,
const ByteString& password,
bool bOwner,
const uint8_t* key);
void AES256_SetPerms(CPDF_Dictionary* pEncryptDict,
uint32_t permission,
bool bEncryptMetadata,
const uint8_t* key);
void OnCreateInternal(CPDF_Dictionary* pEncryptDict,
CPDF_Array* pIdArray,
const ByteString& user_password,
const ByteString& owner_password,
bool bDefault,
uint32_t type);
bool CheckSecurity(const ByteString& password);
void InitCryptoHandler();
int m_Version;
int m_Revision;
UnownedPtr<const CPDF_Dictionary> m_pEncryptDict;
UnownedPtr<const CPDF_Array> m_pIdArray;
uint32_t m_Permissions;
int m_Cipher;
uint8_t m_EncryptKey[32];
int m_KeyLen;
bool m_bOwnerUnlocked;
std::unique_ptr<CPDF_CryptoHandler> m_pCryptoHandler;
};
#endif // CORE_FPDFAPI_PARSER_CPDF_SECURITY_HANDLER_H_
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