From 16f738ecee689c6feb2acb7e4ef4d9bb4144ae7d Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@users.sourceforge.net>
Date: Sun, 8 Jun 2008 11:04:43 +0200
Subject: Initial commit

---
 zip/ZipArchive/ZipCrc32Cryptograph.h | 120 +++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 zip/ZipArchive/ZipCrc32Cryptograph.h

(limited to 'zip/ZipArchive/ZipCrc32Cryptograph.h')

diff --git a/zip/ZipArchive/ZipCrc32Cryptograph.h b/zip/ZipArchive/ZipCrc32Cryptograph.h
new file mode 100644
index 0000000..a25edd0
--- /dev/null
+++ b/zip/ZipArchive/ZipCrc32Cryptograph.h
@@ -0,0 +1,120 @@
+////////////////////////////////////////////////////////////////////////////////
+// This source file is part of the ZipArchive library source distribution and
+// is Copyrighted 2000 - 2007 by Artpol Software - Tadeusz Dracz
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+// 
+// For the licensing details refer to the License.txt file.
+//
+// Web Site: http://www.artpol-software.com
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+* \file ZipCrc32Cryptograph.h
+* Includes the CZipCrc32Cryptograph class.
+*
+*/
+
+#if !defined(ZIPARCHIVE_ZIPCRC32CRYPTOGRAPH_DOT_H)
+#define ZIPARCHIVE_ZIPCRC32CRYPTOGRAPH_DOT_H
+
+#if _MSC_VER > 1000
+	#pragma once
+#endif
+
+#include "zlib/zlib.h"
+
+#include "ZipCryptograph.h"
+#include "ZipFileHeader.h"
+#include "ZipStorage.h"
+
+
+#define ZIPARCHIVE_ENCR_HEADER_LEN 12
+
+/**
+	Performs the traditional zip encryption.
+	
+	\see
+		<a href="kb">0610201627|std</a>
+*/
+class ZIP_API CZipCrc32Cryptograph : public CZipCryptograph
+{
+public:
+	CZipCrc32Cryptograph(){}
+	
+	bool InitDecode(CZipAutoBuffer& password, CZipFileHeader& currentFile, CZipStorage& storage);	
+	void InitEncode(CZipAutoBuffer& password, CZipFileHeader& currentFile, CZipStorage& storage);	
+	void Decode(char* pBuffer, DWORD uSize)
+	{
+		for (DWORD i = 0; i < uSize; i++)
+			CryptDecode(pBuffer[i]);
+	}
+	void Encode(char* pBuffer, DWORD uSize)
+	{
+		for (DWORD i = 0; i < uSize; i++)
+			CryptEncode(pBuffer[i]);
+	}
+
+	bool CanHandle(int iEncryptionMethod)
+	{
+		return iEncryptionMethod == CZipCryptograph::encStandard;
+	}
+
+	/**
+		See CZipCryptograph::GetEncryptedInfoSizeBeforeData
+	*/
+	static DWORD GetEncryptedInfoSizeBeforeData()
+	{
+		return ZIPARCHIVE_ENCR_HEADER_LEN;
+	}
+
+	/**
+		See CZipCryptograph::GetEncryptedInfoSizeAfterData
+	*/
+	static DWORD GetEncryptedInfoSizeAfterData()
+	{
+		return 0;
+	}
+
+	/**
+		Returns the CRC table.
+	*/
+	static const DWORD* GetCRCTable()
+	{
+			return zarch_get_crc_table();
+	}
+private:
+
+	void CryptDecode(char &c)
+	{
+		c ^= CryptDecryptByte();
+		CryptUpdateKeys(c);
+	}
+
+	char CryptDecryptByte()
+	{
+		int temp = (m_keys[2] & 0xffff) | 2;
+		return (char)(((temp * (temp ^ 1)) >> 8) & 0xff);
+	}
+	void CryptInitKeys(CZipAutoBuffer& password);	
+	void CryptUpdateKeys(char c);
+	DWORD CryptCRC32(DWORD l, char c)
+	{
+		const DWORD *CRC_TABLE = zarch_get_crc_table();
+		return CRC_TABLE[(l ^ c) & 0xff] ^ (l >> 8);
+	}
+	void CryptEncode(char &c)
+	{
+		char t = CryptDecryptByte();
+		CryptUpdateKeys(c);
+		c ^= t;
+	}
+	DWORD m_keys[3];
+public:	
+	~CZipCrc32Cryptograph(){}
+};
+
+#endif
-- 
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