使用ASP.Net加密Cookie[3]

    CryptoStream cryptoStream = new CryptoStream(memoryStream,
    triprovider.CreateEncryptor(Key64,IV64),
    CryptoStreamMode.Read);
    //定义读IO流
    StreamReader readerStream = new StreamReader(cryptoStream);
    //返回解密后的字符串
    return(readerStream.ReadToEnd());
    }
    return(null);
    }
    }

    3．创建处理Cookie的类CookieEncrypt

    在应用程序Example_12_6中的类文件EncryptString.cs中添加类CookieEncrypt，该类用来处理应用程序的Cookie，如加密Cookie、获取Cookie、解密Cookie等。类CookieEncrypt的程序代码如下：
    public class CookieEncrypt
    {
    public static void SetCookie(HttpCookie cookie)
    {   //设置Cookie
    HttpContext.Current.Response.Cookies.Set(cookie);
    }
    public static void SetCookie(String key,String valueString)
    {   //设置加密后的Cookie
    key = HttpContext.Current.Server.UrlEncode(key);
    valueString = HttpContext.Current.Server.UrlEncode(valueString);
    HttpCookie cookie = new HttpCookie(key,valueString);
    SetCookie(cookie);
    }
    public static void SetCookie(String key,String valueString,
    DateTime expires)
    {   //设置加密后的Cookie，并设置Cookie的有效时间
    key = HttpContext.Current.Server.UrlEncode(key);
    valueString = HttpContext.Current.Server.UrlEncode(valueString);
    HttpCookie cookie = new HttpCookie(key,valueString);
    cookie.Expires = expires;
    SetCookie(cookie);
    }
    public static void SetTripleDESEncryptedCookie(String key,
    String valueString)
    {   //设置使用TripleDES加密后的Cookie
    key = EncryptString.EncryptTripleDES(key);
    valueString = EncryptString.EncryptTripleDES(valueString);
    SetCookie(key,valueString);
    }
    public static void SetTripleDESEncryptedCookie(String key,
    String valueString,DateTime expires)
    {   //设置使用TripleDES加密后的Cookie，并设置Cookie的有效时间
    key = EncryptString.EncryptTripleDES(key);
    valueString = EncryptString.EncryptTripleDES(valueString);
    SetCookie(key,valueString,expires);
    }