16进制可逆加密算法

16进制可逆操作类：

 public static class Hex16{/// <summary>/// 作用：将字符串内容转化为16进制数据编码，其逆过程是Decode/// 参数说明：/// strEncode 需要转化的原始字符串/// 转换的过程是直接把字符转换成Unicode字符,比如数字"3"-->0033,汉字"我"-->U+6211/// 函数decode的过程是encode的逆过程./// </summary>public static string Encode(string strEncode){string strReturn = "";//  存储转换后的编码try{foreach (short shortx in strEncode.ToCharArray()){strReturn += shortx.ToString("X4");}}catch { }return strReturn;}/// <summary>/// 作用：将16进制数据编码转化为字符串，是Encode的逆过程/// </summary>public static string Decode(string strDecode){string sResult = "";try{for (int i = 0; i < strDecode.Length / 4; i++){sResult += (char)short.Parse(strDecode.Substring(i * 4, 4),global::System.Globalization.NumberStyles.HexNumber);}}catch { }return sResult;}/// <summary>/// 将数字转换成16进制字符串，后两位加入随机字符，其可逆方法为DecodeForNum/// </summary>public static string EncodeForNum(int id){//用户加上起始位置后的int startUserIndex = id;//转换成16进制string hexStr = Convert.ToString(startUserIndex, 16);//后面两位加入随机数string randomchars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";string tmpstr ="";//整除的后得到的数可能大于被除数tmpstr += randomchars[(id / randomchars.Length) > randomchars.Length ? randomchars.Length - 1 : (id / randomchars.Length)];//余数不可能大于被除数tmpstr += randomchars[(id % randomchars.Length) > randomchars.Length ? randomchars.Length - 1 : (id % randomchars.Length)];//返回拼接后的字符，转成大写string retStr = (hexStr + tmpstr).ToUpper();return retStr;}/// <summary>/// 解密16进制字符串，此方法只适合后面两位有随机字符的/// </summary>public static int DecodeForNum(string strDecode){if (strDecode.Length>2){strDecode = strDecode.Substring(0, strDecode.Length - 2);return Convert.ToInt32(strDecode, 16);}return 0;}}