////////////////////////////////////////////////////////////////////////////////
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// This source file is part of the ZipArchive library source distribution and
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// is Copyrighted 2000 - 2011 by Artpol Software - Tadeusz Dracz
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// For the licensing details refer to the License.txt file.
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//
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// Web Site: http://www.artpol-software.com
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////////////////////////////////////////////////////////////////////////////////
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/**
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* \file ZipCrc32Cryptograph.h
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* Includes the CZipCrc32Cryptograph class.
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*
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*/
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#if !defined(ZIPARCHIVE_ZIPCRC32CRYPTOGRAPH_DOT_H)
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#define ZIPARCHIVE_ZIPCRC32CRYPTOGRAPH_DOT_H
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#if _MSC_VER > 1000
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#pragma once
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#endif
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#include "zlib/zlib.h"
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#include "ZipCryptograph.h"
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#include "ZipFileHeader.h"
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#include "ZipStorage.h"
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#define ZIPARCHIVE_ENCR_HEADER_LEN 12
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/**
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Performs the traditional zip encryption.
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\see
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<a href="kb">0610201627|std</a>
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*/
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class ZIP_API CZipCrc32Cryptograph : public CZipCryptograph
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{
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public:
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CZipCrc32Cryptograph(){}
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bool InitDecode(CZipAutoBuffer& password, CZipFileHeader& currentFile, CZipStorage& storage, bool ignoreCheck);
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void InitEncode(CZipAutoBuffer& password, CZipFileHeader& currentFile, CZipStorage& storage);
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void Decode(char* pBuffer, DWORD uSize)
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{
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for (DWORD i = 0; i < uSize; i++)
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CryptDecode(pBuffer[i]);
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}
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void Encode(char* pBuffer, DWORD uSize)
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{
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for (DWORD i = 0; i < uSize; i++)
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CryptEncode(pBuffer[i]);
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}
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bool CanHandle(int iEncryptionMethod)
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{
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return iEncryptionMethod == CZipCryptograph::encStandard;
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}
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/**
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See CZipCryptograph::GetEncryptedInfoSizeBeforeData
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*/
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static DWORD GetEncryptedInfoSizeBeforeData()
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{
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return ZIPARCHIVE_ENCR_HEADER_LEN;
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}
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/**
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See CZipCryptograph::GetEncryptedInfoSizeAfterData
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*/
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static DWORD GetEncryptedInfoSizeAfterData()
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{
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return 0;
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}
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/**
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Returns the CRC table.
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*/
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static const unsigned long* GetCRCTable()
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{
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return zarch_get_crc_table();
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}
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private:
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void CryptDecode(char &c)
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{
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c ^= CryptDecryptByte();
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CryptUpdateKeys(c);
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}
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char CryptDecryptByte()
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{
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int temp = (m_keys[2] & 0xffff) | 2;
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return (char)(((temp * (temp ^ 1)) >> 8) & 0xff);
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}
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void CryptInitKeys(CZipAutoBuffer& password);
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void CryptUpdateKeys(char c);
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DWORD CryptCRC32(DWORD l, char c)
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{
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const unsigned long* CRC_TABLE = zarch_get_crc_table();
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return CRC_TABLE[(l ^ c) & 0xff] ^ (l >> 8);
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}
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void CryptEncode(char &c)
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{
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char t = CryptDecryptByte();
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CryptUpdateKeys(c);
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c ^= t;
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}
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DWORD m_keys[3];
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public:
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~CZipCrc32Cryptograph(){}
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};
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#endif
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