c#調用des64.dll進行加密解密

  /// <summary>
   /// <param name="m_Str"></param>
  /// <param name="m_key"></param>
  /// <param name="flag"></param>
  /// <returns></returns>
 /// </summary>
 public static string KeyOrNoKey(string m_Str,string m_key,uint flag)
  {
   int outLen = b64_size(m_Str.Length, flag);
   StringBuilder Result = new StringBuilder(0xff);
   Result.Capacity = outLen;
   Result.Length = outLen;
   StringBuilder Source = new StringBuilder(m_Str);
   b64_des(Source, Result,m_key, m_Str.Length, flag);
   string s = Result.ToString().Trim();
   return Result.ToString().Trim();
  }

　　這裡有個地方要注意。就是為什麼要用stringbuilder。因為那個參數是可變的。