加密与解密

using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;

namespace Ming.Encrypt
{
    public class EncryptLib
    {
        const string sou = "mingming";
        static byte[] rgbKey = null;
        static byte[] rgbIV = null;
        static EncryptLib()
        {
            rgbKey = Encoding.ASCII.GetBytes(sou);
            rgbIV = rgbKey;
        }

        public static string Key
        {
            set { rgbKey = Encoding.ASCII.GetBytes(value); }
        }

        public static string IV
        {
            set { rgbIV = Encoding.ASCII.GetBytes(value); }
        }

        public static string Encode(string data)
        {
            MemoryStream ms = new MemoryStream();
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            CryptoStream cst = new CryptoStream(ms, des.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(cst);
            sw.WriteLine(data);
            sw.Close();
            cst.Close();
            byte[] ret = ms.ToArray();
            ms.Close();
            return Convert.ToBase64String(ret);
        }

        public static string Decode(string data)
        {
            byte[] by = Convert.FromBase64String(data);
            MemoryStream ms = new MemoryStream(by);
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            CryptoStream cst = new CryptoStream(ms, des.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            string ret = sr.ReadLine();
            sr.Close();
            cst.Close();
            ms.Close();
            return ret;
        }

        //MD5不可逆加密   //32位加密
        public static string GetMD5_32(string s, string charset)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] t = md5.ComputeHash(Encoding.GetEncoding(charset).GetBytes(s));
            StringBuilder sb = new StringBuilder(32);
            for (int i = 0; i < t.Length; i++)
                sb.Append(t[i].ToString("x").PadLeft(2, '0'));
            return sb.ToString();
        }

        //MD5不可逆加密 //16位加密
        public static string GetMd5_16(string ConvertString)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
            t2 = t2.Replace("-", "");
            return t2;
        }
    }
}

摘自 Ming

补充：综合编程 , 安全编程 ,