C#简单加密类
using System; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization.Formatters.Binary; using System.IO; using System.Security.Cryptography; namespace Encryption { public class Encryption { /// <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; } } }