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/**
* @file llxorcipher.h
*
* $LicenseInfo:firstyear=2003&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LLXORCIPHER_H
#define LLXORCIPHER_H
#include "llcipher.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLXORCipher
//
// Implementation of LLCipher which encrypts using a XOR pad.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLXORCipher : public LLCipher
{
public:
LLXORCipher(const U8* pad, U32 pad_len);
LLXORCipher(const LLXORCipher& cipher);
virtual ~LLXORCipher();
LLXORCipher& operator=(const LLXORCipher& cipher);
// Cipher functions
U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) override;
U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) override;
U32 requiredEncryptionSpace(U32 src_len) const override;
// special syntactic-sugar since xor can be performed in place.
bool encrypt(U8* buf, U32 len) { return encrypt((const U8*)buf, len, buf, len) > 0; }
bool decrypt(U8* buf, U32 len) { return decrypt((const U8*)buf, len, buf, len) > 0; }
#ifdef _DEBUG
// This function runs tests to make sure the crc is
// working. Returns true if it is.
static bool testHarness();
#endif
protected:
void init(const U8* pad, U32 pad_len);
U8* mPad;
U8* mHead;
U32 mPadLen;
};
#endif
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