Beyhan Oğur
125 lines
3.5 KiB
C#
125 lines
3.5 KiB
C#
#region license
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// Copyright (C) 2020 ClassicUO Development Community on Github
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//
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// This project is an alternative client for the game Ultima Online.
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// The goal of this is to develop a lightweight client considering
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// new technologies.
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//
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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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//
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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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//
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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 <https://www.gnu.org/licenses/>.
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#endregion
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using System;
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using System.Text;
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namespace ClassicAssist.Data
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{
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internal static class Crypter
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{
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public static string Encrypt( string source )
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{
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byte[] buff = Encoding.ASCII.GetBytes( source );
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int kidx = 0;
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string key = CalculateKey();
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if ( key == string.Empty )
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{
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return string.Empty;
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}
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StringBuilder sb = new StringBuilder( source.Length * 2 + 2 );
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sb.Append( "1+" );
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for ( int i = 0; i < buff.Length; i++ )
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{
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sb.AppendFormat( "{0:X2}", (byte) ( buff[i] ^ (byte) key[kidx++] ) );
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if ( kidx >= key.Length )
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{
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kidx = 0;
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}
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}
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return sb.ToString();
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}
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public static string Decrypt( string source )
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{
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byte[] buff;
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if ( source.Length > 2 && source[0] == '1' && source[1] == '+' )
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{
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buff = new byte[( source.Length - 2 ) >> 1];
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string key = CalculateKey();
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if ( key == string.Empty )
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{
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return string.Empty;
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}
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int kidx = 0;
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for ( int i = 2; i < source.Length; i += 2 )
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{
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byte c;
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try
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{
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c = Convert.ToByte( source.Substring( i, 2 ), 16 );
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}
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catch
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{
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continue;
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}
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buff[( i - 2 ) >> 1] = (byte) ( c ^ (byte) key[kidx++] );
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if ( kidx >= key.Length )
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{
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kidx = 0;
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}
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}
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}
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else
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{
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byte key = (byte) ( source.Length >> 1 );
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buff = new byte[key];
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for ( int i = 0; i < source.Length; i += 2 )
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{
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byte c;
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try
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{
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c = Convert.ToByte( source.Substring( i, 2 ), 16 );
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}
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catch
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{
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continue;
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}
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buff[i >> 1] = (byte) ( c ^ key++ );
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}
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}
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return Encoding.ASCII.GetString( buff );
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}
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private static string CalculateKey()
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{
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return Environment.MachineName;
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}
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}
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} |