mirror of
https://github.com/ONLYOFFICE/core.git
synced 2026-07-11 03:42:47 +08:00
112 lines
4.2 KiB
C++
112 lines
4.2 KiB
C++
/*
|
||
* (c) Copyright Ascensio System SIA 2010-2017
|
||
*
|
||
* This program is a free software product. You can redistribute it and/or
|
||
* modify it under the terms of the GNU Affero General Public License (AGPL)
|
||
* version 3 as published by the Free Software Foundation. In accordance with
|
||
* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
|
||
* that Ascensio System SIA expressly excludes the warranty of non-infringement
|
||
* of any third-party rights.
|
||
*
|
||
* This program is distributed WITHOUT ANY WARRANTY; without even the implied
|
||
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
|
||
* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
|
||
*
|
||
* You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
|
||
* EU, LV-1021.
|
||
*
|
||
* The interactive user interfaces in modified source and object code versions
|
||
* of the Program must display Appropriate Legal Notices, as required under
|
||
* Section 5 of the GNU AGPL version 3.
|
||
*
|
||
* Pursuant to Section 7(b) of the License you must retain the original Product
|
||
* logo when distributing the program. Pursuant to Section 7(e) we decline to
|
||
* grant you any rights under trademark law for use of our trademarks.
|
||
*
|
||
* All the Product's GUI elements, including illustrations and icon sets, as
|
||
* well as technical writing content are licensed under the terms of the
|
||
* Creative Commons Attribution-ShareAlike 4.0 International. See the License
|
||
* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
|
||
*
|
||
*/
|
||
#ifndef _PDF_READER_DECRYPT_H
|
||
#define _PDF_READER_DECRYPT_H
|
||
|
||
#include "StringExt.h"
|
||
#include "Object.h"
|
||
#include "Stream.h"
|
||
|
||
namespace PdfReader
|
||
{
|
||
//-------------------------------------------------------------------------------------------------------------------------------
|
||
// Decrypt
|
||
//-------------------------------------------------------------------------------------------------------------------------------
|
||
|
||
class Decrypt
|
||
{
|
||
public:
|
||
|
||
// Строим FileKey. Параметр <sFileKey> должен иметь место как минимум под 16 байт. Проверяем <seOwnerPassword> и <seUserPassword>
|
||
// и возвращаем true, если какой-нибудь корректен. Пишем <pbOwnerPasswordValide> = true, если <seOwnerPassword> был правильный.
|
||
// Один какой-нибудь или оба пароля могут быть NULL, что мы будем понимать как пустую строку.
|
||
static bool MakeFileKey(int nEncVersion, int nEncRevision, int nKeyLength, StringExt *seOwnerKey, StringExt *seUserKey, int nPermissions, StringExt *seFileID, StringExt *seOwnerPassword, StringExt *seUserPassword, unsigned char *sFileKey, bool bEncryptMetadata, bool *pbOwnerPasswordValid);
|
||
|
||
private:
|
||
|
||
static bool MakeFileKey2(int nEncVersion, int nEncRevision, int nKeyLength, StringExt *seOwnerKey, StringExt *seUserKey, int nPermissions, StringExt *seFileID, StringExt *seUserPassword, unsigned char *sFileKey, bool bEncryptMetadata);
|
||
};
|
||
|
||
//-------------------------------------------------------------------------------------------------------------------------------
|
||
// DecryptStream
|
||
//-------------------------------------------------------------------------------------------------------------------------------
|
||
|
||
struct DecryptRC4State
|
||
{
|
||
unsigned char sState[256];
|
||
unsigned char unX;
|
||
unsigned char unY;
|
||
int nBuffer;
|
||
};
|
||
|
||
struct DecryptAESState
|
||
{
|
||
unsigned int arrW[44];
|
||
unsigned char sState[16];
|
||
unsigned char sCBC[16];
|
||
unsigned char sBuffer[16];
|
||
int nBufferIndex;
|
||
};
|
||
|
||
class DecryptStream : public FilterStream
|
||
{
|
||
|
||
public:
|
||
|
||
DecryptStream(Stream *pStream, unsigned char *sFileKey, CryptAlgorithm eType, int nKeyLength, int nObjectNum, int nObjectGen);
|
||
virtual ~DecryptStream();
|
||
virtual StreamType GetType()
|
||
{
|
||
return strWeird;
|
||
}
|
||
virtual void Reset();
|
||
virtual int GetChar();
|
||
virtual int LookChar();
|
||
virtual bool IsBinary(bool bLast);
|
||
virtual Stream *getUndecodedStream() { return this; }
|
||
|
||
private:
|
||
|
||
CryptAlgorithm m_eCryptType;
|
||
int m_nObjectKeyLength;
|
||
unsigned char m_sObjectKey[16 + 9];
|
||
|
||
union
|
||
{
|
||
DecryptRC4State oRC4;
|
||
DecryptAESState oAES;
|
||
} m_oState;
|
||
};
|
||
}
|
||
|
||
#endif // _PDF_READER_DECRYPT_H
|