Asp.net中URL加密和解密

下面介绍常用的加密解密方法：

1.加密。 　　Response.Redirect("DetailInfo.aspx?id=" + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("sp10006")).Replace("+","%2B")); 　

　2.解密。 　　string ID = System.Text.Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));

二、DEC加密解密

using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

namespace EIP.Framework

{

public class Security

{

string _QueryStringKey = "abcdefgh"; //URL传输参数加密

Key string _PassWordKey = "hgfedcba"; //PassWord加密

Key public Security() { }

public string EncryptQueryString(string QueryString) { return Encrypt(QueryString,_QueryStringKey); } public string DecryptQueryString(string QueryString) { return Decrypt(QueryString,_QueryStringKey); } public string EncryptPassWord(string PassWord) { return
Encrypt(PassWord,_PassWordKey); }

public string DecryptPassWord(string PassWord)

{ return Decrypt(PassWord,_PassWordKey); } /// /// DEC 加密过程 /// /// /// ///

public string Encrypt(string pToEncrypt,string sKey)

{ DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //

byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

des.Key = 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 MemoryStream ms = new MemoryStream(); //使得输入密码必须输入英文文本

CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

StringBuilder ret = new StringBuilder();

foreach(byte b in ms.ToArray()) { ret.AppendFormat("{0:X2}", b); }

ret.ToString(); return ret.ToString(); } /// /// DEC 解密过程 /// /// /// ///

public string Decrypt(string pToDecrypt, string sKey)

{ DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = new byte[pToDecrypt.Length / 2];

for(int x = 0; x < pToDecrypt.Length / 2; x++)

{ int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));

inputByteArray[x] = (byte)i; }

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密对象的密钥和偏移量，此值重要，不能修改 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(); StringBuilder ret = new StringBuilder(); //建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象

return System.Text.Encoding.Default.GetString(ms.ToArray()); } /// /// 检查己加密的字符串是否与原文相同 /// /// /// /// ///

public bool ValidateString(string EnString, string FoString, int Mode)

{

switch (Mode)

{ default: case 1: if (Decrypt(EnString,_QueryStringKey) == FoString.ToString()) { return true; } else { return false; } case 2: if (Decrypt(EnString,_PassWordKey) == FoString.ToString()) { return true; } else { return false; } } } } } 类中URL及帐号加密使用了不同的KEY。

调用URL加密过程如下： EIP.Framework.Security objSecurity = new EIP.Framework.Security(); objSecurity.EncryptQueryString(''待加密的字符串'');

解密:objSecurity.DecryptQueryString(''传递过来的参数);