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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
/// <summary>
/// 加密字符
/// </summary>
/// <param name=pToEncrypt>加密字符串</param>
/// <param name=skey>加密密钥</param>
/// <returns>返回加密</returns>
public class DescMD5
{
public static string skey = "abcdefgh";
public string Skey
{
get { return skey; }
set { skey = value; }
}
/// <summary>
/// 加密函数
/// </summary>
/// <param name="pToEncrypt"></param>
/// <returns></returns>
public string EnCrypt(string pToEncrypt)
{
//访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.Key = System.Text.ASCIIEncoding.ASCII.GetBytes(skey);//建立加密对象的密钥和偏移量
des.IV = ASCIIEncoding.ASCII.GetBytes(skey); //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
byte[] inputbyteArray = Encoding.Default.GetBytes(pToEncrypt);//把字符串放到byte数组中
MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputbyteArray, 0, inputbyteArray.Length);
cs.FlushFinalBlock();//上面已经完成了把加密后的结果放到内存中去
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
return ret.ToString();
}
/// <summary>
/// 解密ESC函数
/// </summary>
/// <param name="pToDecrypt">被解密的字符串</param>
/// <param name="sKey">密钥(只支持8个字节的密钥,同前面的加密密钥相同)</param>
/// <returns>返回被解密的字符串</returns>
public string DeCrypt(string pToDecrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte []inputbyteArray=new byte[pToDecrypt.Length/2];
for (int i = 0; i < pToDecrypt.Length / 2; i++)
{
int x = Convert.ToInt32(pToDecrypt.Substring(i * 2, 2), 16);
inputbyteArray[i] = (byte)x;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(skey);
des.IV = ASCIIEncoding.ASCII.GetBytes(skey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputbyteArray, 0, inputbyteArray.Length);
cs.FlushFinalBlock();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
public DescMD5() { }
}
void Application_BeginRequest(object sender, EventArgs e)
{
for (int i=0; i < Request.Form.Count;i++)
{
if (Request.Form[i].ToString() == "__VIEWSTATE") continue;
if (IsM(Request.Form[i].ToString()))
{
Response.Write("您提交的内容中含有非法字符.");
Response.End();
}
}
}
protected bool IsM(string InText)
{
string word = @"";
if (InText == null)
return false;
if (Regex.IsMatch(InText,word))
return true;
return false;
}
Regex.Replace