實現簡單的資料加密-可直接引用

  //要加密的檔案，加密後的檔案，加密的key值

public static bool DescryptDES(string inf, string ouf, string encrypKey)
    {
        byte[] rgbIv = Keys; //加密的IV向量，使用者自己定義一個，這裡就沒直接給出{0x25}
        byte[] rgbKey = Encoding.UTF8.GetBytes(encrypKey.Substring(0, 8));
        FileStream infs = new FileStream(inf, FileMode.Open, FileAccess.Read);
        FileStream outfs = new FileStream(ouf, FileMode.OpenOrCreate, FileAccess.Write);
        //讀的流放一個位置，我們知道讀的流都是二進位的
        byte[] bytein = new byte[100];
        long readLen = 0;
        long toatalLen = inf.Length;
        int erentLen;//每次讀的步長
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        CryptoStream encStream = new CryptoStream(outfs, des.CreateEncryptor(rgbKey, rgbIv), CryptoStreamMode.Write);
        while(readLen<toatalLen)
        {
           erentLen= infs.Read(bytein, 0, 100);//每次讀取的布長，因為他都迴圈
           encStream.Write(bytein, 0, erentLen);
           readLen = readLen + erentLen;
        }
        encStream.Close();
        infs.Close();
        outfs.Close();
        return true; //加密成功
    }