byte[] temp   = new byte[codelen/2];
  byte[] result = new byte[codelen/2 - 1];
  for ( int i = 0 ; i < temp.Length ; i++ )
  {
   temp[i]  = byte.Parse( code.Substring( 2*i,2),System.Globalization.NumberStyles.HexNumber);
  }
  for ( int i = 1 ; i < temp.Length ; i++ )
  {
   result[i-1] = (byte)( key[(i-1) % keylen] ^ temp[i] );
   if ( temp[i-1] < result[i-1] )
   {
    result[i-1] = (byte)(result[i-1] - temp[i-1]);
   }
   else
   {
    result[i-1] = (byte)(result[i-1] + 0xFF - temp[i-1]) ;
   }
  }

  int key = int.Parse(tbKey.Text);
  for ( int i = 0 ,key0 = key; i < result.Length ; i++ )
  {
   int k = result[i] ;
   result[i] =  (byte)(result[i] ^ (key0>>8) );
   key0 = ( k + key0 ) * key + key ;
  }

  int k = 0x14 ;
  for ( int i = 0 ; i < namelen ; i++ )
  {
   
   result[i] = (byte)(names[i] ^ (k>>8));
   k = ( result[i] + k ) * 0x64 + 0xC8 ;
  }

  int key = 0x14;
  for ( int i = 0 ,key0 = key; i < namelen ; i++ )
  {
   
   int k = result[i] ;
   result[i] =  (byte)(result[i] ^ (key0>>8));
   key0 = ( k + key0 ) * 0x64 + 0xc8 ;
  }

  byte[] keys = System.Text.Encoding.Default.GetBytes( tbKey.Text );
  int key = int.Parse(tbKey.Text);
  
  byte[] temp = System.Text.Encoding.Default.GetBytes(tbName.Text);
  byte[] result = new byte[temp.Length + 1];
  
  for ( int i = 0 , key0 = key ; i < temp.Length ; i++ )
  {
   temp[i] = (byte)( temp[i] ^ ( key0 >> 8));
   key0 = ( temp[i] + key0 ) * key + key ;
  }
  Random rnd = new Random();
  rnd.NextBytes(result);
  for ( int i = 1 ; i < result.Length ; i++ )
  {
   int k = temp[i-1] + result[i-1];
   if ( k >= 0xFF )
   {
    k = k - 0xFF  ;
   }
   temp[i-1] = (byte)k;
   result[i] = (byte)(temp[i-1] ^ keys[(i-1)%keys.Length]) ;
  }
  tbCode.Text = string.Empty;
  for ( int i = 0 ; i < result.Length ; i++ )
  {
   tbCode.Text += result[i].ToString("X2");
  }