C#简单密码加密解密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.IO;

namespace SandInspect.Common
{
    public class Md5
    {
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="strSource"></param>
        /// <returns></returns>
        public static string Md5Encrypt(string strSource)
        {
            //把字符串放到byte数组中
            byte[] bytIn = Encoding.Default.GetBytes(strSource);
            //建立加密对象的密钥和偏移量
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
            //实例DES加密类
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            //实例MemoryStream流加密密文件
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            string strOut = System.Convert.ToBase64String(ms.ToArray());
            return strOut;

        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Source"></param>
        /// <returns></returns>
        public static string Md5Decrypt(string Source)
        {
            //将解密字符串转换成字节数组
            byte[] bytIn = System.Convert.FromBase64String(Source);
            //给出解密的密钥和偏移量，密钥和偏移量必须与加密时的密钥和偏移量相同
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            //实例流进行解密
            System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader strd = new StreamReader(cs, Encoding.Default);
            return strd.ReadToEnd();
        }

        /// <summary>
        /// MD532位小写加密
        /// </summary>
        /// <param name="myString"></param>
        /// <returns></returns>
        public static string GetMD5(string myString)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            //byte[] fromData = System.Text.Encoding.Unicode.GetBytes(myString);
            byte[] fromData = System.Text.Encoding.UTF8.GetBytes(myString);//
            byte[] targetData = md5.ComputeHash(fromData);
            string byte2String = null;

            for (int i = 0; i < targetData.Length; i++)
            {
                //这个是很常见的错误，你字节转换成字符串的时候要保证是2位宽度啊，某个字节为0转换成字符串的时候必须是00的，否则就会丢失位数啊。不仅是0，1～9也一样。
                //byte2String += targetData[i].ToString("x");//这个会丢失
                byte2String = byte2String + targetData[i].ToString("x2");
            }

            return byte2String;
        }

    }
}