Enterprise Library 4.1学习笔记6----加密应用程序块

Code
using System;
using System.Text;
using Microsoft.Practices.EnterpriseLibrary.Security.Cryptography;

namespace EncryptTest
{
    public partial class _Default : System.Web.UI.Page
    {
        //这二个值必须与web.config相关Providers中的name一致
        private const string hashProvider = "SHA256Managed";
        private const string symmProvider = "RC2CryptoServiceProvider";
        

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        /// <summary>
        /// 生成Hash散列值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnHash_Click(object sender, EventArgs e)
        {
            byte[] valueToHash = Encoding.Default.GetBytes(txtOriginal.Text);

            byte[] generatedHash = Cryptographer.CreateHash(hashProvider, valueToHash);

            // Clear the byte array memory
            Array.Clear(valueToHash, 0, valueToHash.Length);

            lHash.Text = Convert.ToBase64String(generatedHash);
        }

        /// <summary>
        /// 比较Hash散列值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnCompare_Click(object sender, EventArgs e)
        {
            byte[] valueToHash = System.Text.Encoding.UTF8.GetBytes(txtCompare.Text);

            if (lHash.Text != "")
            {
                bool matched = Cryptographer.CompareHash(hashProvider, valueToHash, Convert.FromBase64String(lHash.Text));

                // Clear the byte array memory
                Array.Clear(valueToHash, 0, valueToHash.Length);

                if (matched)
                {
                    lCompare.Text = "<span style='color:green'>该字符串未被篡改过!</span>";                    
                }
                else
                {
                    lCompare.Text = "<span style='color:red'>该字符串被修改过了!</span>";
                }
            }
        }

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnEncrypt_Click(object sender, EventArgs e)
        {
            lEncrypt.Text = Cryptographer.EncryptSymmetric(symmProvider, txtOriginal2.Text);
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnDecrypt_Click(object sender, EventArgs e)
        {
            lDecrypt.Text = Cryptographer.DecryptSymmetric(symmProvider, lEncrypt.Text);
        }
    }
}

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeBehind = " Default.aspx.cs "  Inherits = " EncryptTest._Default "   %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head  runat ="server" >
     < title ></ title >
     < style  type ="text/css" >
        *
         {
            font-size :  12px ;
            line-height :  18px ;
         }
        th
         {
            font-size :  14px ;
            line-height :  20px ;
         }
        .btn
         {
            height :  21px ;
            width :  100px ;
            line-height :  16px ;
         }
     </ style >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
     < table >
         < tr >
             < th  colspan ="3"  align ="center" >
                Hash算法测试
             </ th >
         </ tr >
         < tr >
             < td  align ="right" >
                输入要加密的文字：
             </ td >
             < td >
                 < asp:TextBox  ID ="txtOriginal"  runat ="server"  Width ="300px" ></ asp:TextBox >
             </ td >
             < td  align ="left" >
                 < asp:Button  ID ="btnHash"  runat ="server"  Text ="生成Hash散列"  OnClick ="btnHash_Click"  CssClass ="btn"   />
             </ td >
         </ tr >
         < tr >
             < td  colspan ="3"  align ="center" >
                 < asp:Literal  ID ="lHash"  runat ="server" ></ asp:Literal >
             </ td >
         </ tr >
         < tr >
             < td  align ="right" >
                请输入要比较的文字：
             </ td >
             < td >
                 < asp:TextBox  ID ="txtCompare"  runat ="server"  Width ="300px" ></ asp:TextBox >
             </ td >
             < td  align ="left" >
                 < asp:Button  ID ="btnCompare"  runat ="server"  Text ="比较Hash散列"  OnClick ="btnCompare_Click"
                    CssClass ="btn"   />
             </ td >
         </ tr >
         < tr >
             < td  colspan ="3"  align ="center" >
                 < asp:Literal  ID ="lCompare"  runat ="server" ></ asp:Literal >
             </ td >
         </ tr >
         < tr >
             < th  colspan ="3"  align ="center" >
                对称加密算法测试
             </ th >
         </ tr >
         < tr >
             < td  align ="right" >
                输入要加密的文字：
             </ td >
             < td >
                 < asp:TextBox  ID ="txtOriginal2"  runat ="server"  Width ="300px" ></ asp:TextBox >
             </ td >
             < td  align ="left" >
                 < asp:Button  ID ="btnEncrypt"  runat ="server"  Text =" 加 密 "  CssClass ="btn"  OnClick ="btnEncrypt_Click"   />
             </ td >
         </ tr >
         < tr >
             < td  colspan ="3"  align ="center" >
                 < asp:Literal  ID ="lEncrypt"  runat ="server" ></ asp:Literal >
             </ td >
         </ tr >
         < tr >
             < td  align ="right" >
                输入要解密的密码：
             </ td >
             < td >
                 < asp:TextBox  ID ="txtEncrypt"  runat ="server"  Width ="300px" ></ asp:TextBox >
             </ td >
             < td  align ="left" >
                 < asp:Button  ID ="btnDecrypt"  runat ="server"  Text =" 解 密 "  CssClass ="btn"  
                    onclick ="btnDecrypt_Click" />
             </ td >
         </ tr >
         < tr >
             < td  colspan ="3"  align ="center" >
                 < asp:Literal  ID ="lDecrypt"  runat ="server" ></ asp:Literal >
             </ td >
         </ tr >
     </ table >
     </ form >
</ body >
</ html >