68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/**
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* @file llxorcipher.h
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*
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* $LicenseInfo:firstyear=2003&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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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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