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126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2017
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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_WRITER_SRC_ENCRYPT_H
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#define _PDF_WRITER_SRC_ENCRYPT_H
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#include "Utils.h"
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#define ID_LEN 16
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#define PASSWD_LEN 32
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#define ENCRYPT_KEY_MAX 16
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#define MD5_KEY_LEN 16
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#define PERMISSION_PAD 0xFFFFFFC0
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#define ARC4_BUF_SIZE 256
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namespace PdfWriter
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{
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void PadOrTrancatePassword(const char *sPassword, BYTE *pNewPassword);
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//----------------------------------------------------------------------------------------
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//
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// The code implements MD5 message-digest algorithm.
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// To compute the message digest of a chunk of bytes, declare an
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// MD5Context structure, pass it to MD5Init, call MD5Update as
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// needed on buffers full of bytes, and then call MD5Final, which
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// will fill a supplied 16-byte array with the digest.
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//
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//----------------------------------------------------------------------------------------
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class CMd5
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{
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public:
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CMd5();
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void Init();
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void Update(const BYTE* pBuffer, unsigned int unLen);
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void Final(BYTE anDigest[16]);
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private:
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void Clear();
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private:
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unsigned int m_anBuf[4];
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unsigned int m_anBits[2];
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BYTE m_anIn[64];
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};
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class CArc4
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{
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public:
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void Init(const BYTE* pKey, unsigned int unKeyLen);
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void CryptBuf(const BYTE* pIn, BYTE* pOut, unsigned int unLen);
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private:
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BYTE m_nIndex1;
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BYTE m_nIndex2;
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BYTE m_anState[ARC4_BUF_SIZE];
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};
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class CEncrypt
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{
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public:
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CEncrypt();
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void Init();
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void CreateUserKey();
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void CreateOwnerKey();
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void CreateEncryptionKey();
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void InitKey(unsigned int unObjectId, unsigned short unGenNo);
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void Reset();
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void CryptBuf(const BYTE* pSrc, BYTE* pDst, unsigned int unLen);
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void SetPermission(unsigned int unPermission);
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void SetMode(EEncryptMode eMode, unsigned int unKeyLen);
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private:
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EEncryptMode m_eMode;
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unsigned int m_unKeyLen; // unKeyLen должно быть кратно 8, и лежать в отрезке от 40 и до 128
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BYTE m_anOwnerPassword[PASSWD_LEN]; // Owner-Password (не шифрованный)
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BYTE m_anUserPassword[PASSWD_LEN]; // User-Password (не шифрованный)
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BYTE m_anOwnerKey[PASSWD_LEN]; // Owner-Password (шифрованный)
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BYTE m_anUserKey[PASSWD_LEN]; // User-Password (шифрованный)
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unsigned int m_unPermission;
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BYTE m_anEncryptID[ID_LEN];
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BYTE m_anEncryptionKey[MD5_KEY_LEN + 5];
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BYTE m_anMD5EncryptionKey[MD5_KEY_LEN];
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CArc4 m_oArc4Context;
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friend class CEncryptDict;
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friend class CDocument;
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};
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}
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#endif // _PDF_WRITER_SRC_ENCRYPT_H
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