operate.cs

互动媒体学习系统 1．后台 用户注册登录后可进行发布教程、下载等操作 对教程信息进行添加、查询操作。 对视频课堂信息进行查看操作。 对语音课堂信息进行查看操作。 2．后台 输入用户名及密

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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

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

/// <summary>
/// Operate 的摘要说明
/// </summary>
public class Operate
{
    public static DataSet ds;
	public Operate()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    //加密：
    public static string Encrypting(string strSource)
    {
        //把字符串放到byte数组中
        byte[] bytIn = System.Text.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();
        return System.Convert.ToBase64String(ms.ToArray());
    }


    //解密：
    public static string Decrypting(string Source)
    {
        try
        {
            //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();
        }
        catch (Exception ex)
        {
            throw new Exception("在文件解密的时候出现错误！错误提示： \n" + ex.Message);
        }
    }

  
}