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/*==LICENSE==*
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CyanWorlds.com Engine - MMOG client, server and tools
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Copyright (C) 2011 Cyan Worlds, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
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or by snail mail at:
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Cyan Worlds, Inc.
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14617 N Newport Hwy
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Mead, WA 99021
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*==LICENSE==*/
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//////////////////////////////////////////////////////////////////////////////
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// //
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// plEncryptLogLine Header //
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// //
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//// Description /////////////////////////////////////////////////////////////
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// //
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// Broken into a separate file for easy include in utility apps //
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// //
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//////////////////////////////////////////////////////////////////////////////
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#include "plEncryptLogLine.h"
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#include <string.h>
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void plStatusEncrypt::Encrypt( UInt8 *line, UInt8 hint )
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{
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// Current encryption scheme: rotate all characters right by 2 bits,
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// then rotate the whole damn line by 3 bits to the right
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UInt32 i, len = strlen( (char *)line );
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UInt8 newHi, hiBits = ( ( line[ len - 1 ] ) << ( 5 - 2 ) ) & 0xe0;
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for( i = 0; i < len; i++ )
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{
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// So each character will be the src char rotated right 2 bits, then shifted
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// right 3 bits, or'ed with the last high bits, and the 3 discarded bits
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// become the new high bits
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// Too bad C doesn't have a bit-rotate op
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line[ i ] = ( line[ i ] << 6 ) | ( line[ i ] >> 2 );
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newHi = line[ i ] << 5;
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line[ i ] = ( line[ i ] >> 3 ) | hiBits;
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line[ i ] ^= hint; // Should wrap around
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hiBits = newHi;
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}
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}
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void plStatusEncrypt::Decrypt( UInt8 *line, Int32 len, UInt8 hint )
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{
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// Da reverse, of course!
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Int32 i;
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UInt8 lastChar = 0, newLo, loBits = ( line[ 0 ] ^ hint ) >> 5;
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for( i = len - 1; i >= 0; i-- )
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{
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lastChar = line[ i ];
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line[ i ] ^= hint;
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newLo = line[ i ] >> 5;
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line[ i ] = ( line[ i ] << 3 ) | loBits;
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line[ i ] = ( line[ i ] >> 6 ) | ( line[ i ] << 2 );
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loBits = newLo;
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}
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}
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