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79 lines
2.6 KiB
79 lines
2.6 KiB
/*==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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