74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/**
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* @file llxorcipher.h
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*
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* $LicenseInfo:firstyear=2003&license=viewergpl$
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*
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* Copyright (c) 2003-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LLXORCIPHER_H
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#define LLXORCIPHER_H
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#include "llcipher.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Class LLXORCipher
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//
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// Implementation of LLCipher which encrypts using a XOR pad.
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class LLXORCipher : public LLCipher
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{
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public:
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LLXORCipher(const U8* pad, U32 pad_len);
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LLXORCipher(const LLXORCipher& cipher);
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virtual ~LLXORCipher();
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LLXORCipher& operator=(const LLXORCipher& cipher);
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// Cipher functions
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/*virtual*/ U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
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/*virtual*/ U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len);
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/*virtual*/ U32 requiredEncryptionSpace(U32 src_len) const;
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// special syntactic-sugar since xor can be performed in place.
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BOOL encrypt(U8* buf, U32 len) { return encrypt((const U8*)buf, len, buf, len); }
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BOOL decrypt(U8* buf, U32 len) { return decrypt((const U8*)buf, len, buf, len); }
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#ifdef _DEBUG
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// This function runs tests to make sure the crc is
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// working. Returns TRUE if it is.
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static BOOL testHarness();
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#endif
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protected:
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void init(const U8* pad, U32 pad_len);
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U8* mPad;
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U8* mHead;
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U32 mPadLen;
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};
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#endif
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