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112 lines
4.2 KiB
C++
112 lines
4.2 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2016
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
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* EU, LV-1021.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#ifndef _PDF_READER_DECRYPT_H
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#define _PDF_READER_DECRYPT_H
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#include "StringExt.h"
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#include "Object.h"
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#include "Stream.h"
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namespace PdfReader
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{
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//-------------------------------------------------------------------------------------------------------------------------------
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// Decrypt
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//-------------------------------------------------------------------------------------------------------------------------------
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class Decrypt
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{
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public:
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// Строим FileKey. Параметр <sFileKey> должен иметь место как минимум под 16 байт. Проверяем <seOwnerPassword> и <seUserPassword>
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// и возвращаем true, если какой-нибудь корректен. Пишем <pbOwnerPasswordValide> = true, если <seOwnerPassword> был правильный.
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// Один какой-нибудь или оба пароля могут быть NULL, что мы будем понимать как пустую строку.
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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);
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private:
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static bool MakeFileKey2(int nEncVersion, int nEncRevision, int nKeyLength, StringExt *seOwnerKey, StringExt *seUserKey, int nPermissions, StringExt *seFileID, StringExt *seUserPassword, unsigned char *sFileKey, bool bEncryptMetadata);
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};
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//-------------------------------------------------------------------------------------------------------------------------------
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// DecryptStream
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//-------------------------------------------------------------------------------------------------------------------------------
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struct DecryptRC4State
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{
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unsigned char sState[256];
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unsigned char unX;
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unsigned char unY;
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int nBuffer;
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};
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struct DecryptAESState
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{
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unsigned int arrW[44];
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unsigned char sState[16];
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unsigned char sCBC[16];
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unsigned char sBuffer[16];
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int nBufferIndex;
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};
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class DecryptStream : public FilterStream
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{
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public:
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DecryptStream(Stream *pStream, unsigned char *sFileKey, CryptAlgorithm eType, int nKeyLength, int nObjectNum, int nObjectGen);
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virtual ~DecryptStream();
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virtual StreamType GetType()
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{
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return strWeird;
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}
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virtual void Reset();
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virtual int GetChar();
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virtual int LookChar();
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virtual bool IsBinary(bool bLast);
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virtual Stream *getUndecodedStream() { return this; }
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private:
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CryptAlgorithm m_eCryptType;
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int m_nObjectKeyLength;
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unsigned char m_sObjectKey[16 + 9];
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union
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{
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DecryptRC4State oRC4;
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DecryptAESState oAES;
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} m_oState;
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};
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}
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#endif // _PDF_READER_DECRYPT_H
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