www.pudn.com > boogiebot.zip > WoWCrypt.cs

/* 
 * Copyright ¸ 2005 Kele (fooleau@gmail.com) 
 * This library is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU Lesser General Public  
 * License version 2.1 as published by the Free Software Foundation 
 * (the "LGPL"). 
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY 
 * OF ANY KIND, either express or implied. 
 */ 
 
using System; 
 
namespace Foole.Crypt 
{ 
	/// 
 
	/// This class handles the encryption that is done on the headers of world server packets. 
	/// The Key is 40 bytes long 
	/// 
 
	public class WoWCrypt 
	{ 
		private bool mInitialised = false; 
		 
		// Encryption state 
		private byte mEncPrev; 
		public int mEncIndex; 
		// Decryption state 
		public byte mDecPrev;  
		public int mDecIndex; 
 
		public byte[] mKey; 
 
		public void Init(byte[] Key) 
		{ 
			mKey = (byte[]) Key.Clone(); 
			mInitialised = true; 
		} 
        public byte GetDecPrev() 
        { 
            return mDecPrev; 
        } 
        public void SetDecPrev(byte SetTo) 
        { 
            mDecPrev = SetTo; 
        } 
        public int GetDecIndex() 
        { 
            return mDecIndex; 
        } 
        public void SetDecIndex(int SetTo) 
        { 
            mDecIndex = SetTo; 
        } 
		public void Decrypt(byte[] Data, int Length) 
		{ 
			if (mInitialised == false) return; 
 
			for(int i = 0; i < Length; ++i) 
			{ 
				byte x = (byte)((Data[i] - mDecPrev) ^ mKey[mDecIndex]); 
				++mDecIndex; 
				mDecIndex %= mKey.Length; 
				mDecPrev = Data[i]; 
				Data[i] = x; 
			} 
		} 
 
		public void Encrypt(byte[] Data, int Length) 
		{ 
			if (mInitialised == false) return; 
			 
			for(int i = 0; i < Length; ++i) 
			{ 
				byte x = (byte)((Data[i] ^ mKey[mEncIndex]) + mEncPrev); 
				++mEncIndex; 
				mEncIndex %= mKey.Length; 
				mEncPrev = x; 
				Data[i] = x; 
			}			 
		} 
	} 
}