[FAQ]C#實現CFS編碼加密

Q：

用C#實現CFS編碼加密（ASP中常用的密碼編譯演算法）。

refer：http://bbs.csdn.net/topics/390538946

A：

class Program{    public static String CfsPas(String CodeStr)    {        int CodeLen;        int CodeSpace;        double NewCode;        int cecr, cecb, cec;         CodeLen = 30;        CodeSpace = CodeLen - CodeStr.Length;        if (CodeSpace >= 1)        {            for (cecr = 1; cecr <= CodeSpace; cecr++)                CodeStr = CodeStr + (char)21;        }         NewCode = 1;        long Been = 0;        for (cecb = 1; cecb <= CodeLen; cecb++)        {            Been = CodeLen + ((int)Convert.ToChar(CodeStr.Substring(cecb - 1, 1))) * cecb;            NewCode = Convert.ToDouble(NewCode * Been);        }         CodeStr = NewCode.ToString();         string NewCodeStr = "";        for (cec = 1; cec <= CodeStr.Length; cec++)        {            if (CodeStr.Length - cec < 3)                NewCodeStr += CfsCode(CodeStr.Substring(cec - 1));            else                NewCodeStr += CfsCode(CodeStr.Substring(cec - 1, 3));        }         string EnPas = "";        for (cec = 20; cec <= NewCodeStr.Length - 18; cec += 2)            EnPas = EnPas + NewCodeStr.Substring(cec - 1, 1);        return EnPas.ToUpper();    }     static string CfsCode(string Word)    {        string CfsCode = "";        for (int i = 0; i < Word.Length; i++)        {            CfsCode = CfsCode + (int)Convert.ToChar(Word.Substring(i, 1));        }        CfsCode = string.Format("{0:X}", int.Parse(CfsCode));        return CfsCode;    }     static void Main(string[] args)    {        string md5 = "d99e33a642209c61";        Console.Write("Input:" + md5);        Console.WriteLine();        Console.Write("Ouput:" + CfsPas("d99e33a642209c61"));         Console.WriteLine();        Console.WriteLine();        Console.Write("Input:" + "123");        Console.WriteLine();        Console.Write("Ouput:" + CfsPas("123"));        Console.ReadLine();    }}

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