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

学习这一块内容前，先得大概知道"哈希算法"和"对称加密算法"是咋回事儿.

不清楚的先去这里充电5分钟再回来

哈希算法------http://baike.baidu.com/view/273836.htm

对称加密算法--http://baike.baidu.com/view/7591.htm

使用步骤:

1.先添加Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.dll的引用

2.参照http://www.cnblogs.com/Terrylee/archive/2005/11/29/286688.html中所写，创建web.config中的相关节点

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

需要注意的是:
对称算法中的密钥文本文件，在asp.net环境中一定不要存放在网站目录下，否则谁都可以下载，形同虚设!

完成后，web.config内容大概如下:

<configuration>
<configSections>
Enterprise Library 4.1学习笔记6----加密应用程序块

<section name="securityCryptographyConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.Configuration.CryptographySettings, Microsoft.Practices.EnterpriseLibrary.Security.Cryptography, Version=4.1.0.0, Culture=neutral"/>
Enterprise Library 4.1学习笔记6----加密应用程序块

    </configSections>
    <securityCryptographyConfiguration>
        <hashProviders>
            <add algorithmType="System.Security.Cryptography.SHA256Managed, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" saltEnabled="true" type="Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.HashAlgorithmProvider, Microsoft.Practices.EnterpriseLibrary.Security.Cryptography, Version=4.1.0.0, Culture=neutral" name="SHA256Managed"/>
        </hashProviders>
        <symmetricCryptoProviders>
            <add algorithmType="System.Security.Cryptography.RC2CryptoServiceProvider, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" protectedKeyFilename="C:\key.txt" protectedKeyProtectionScope="LocalMachine" type="Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.SymmetricAlgorithmProvider, Microsoft.Practices.EnterpriseLibrary.Security.Cryptography, Version=4.1.0.0, Culture=neutral" name="RC2CryptoServiceProvider"/>
        </symmetricCryptoProviders>
    </securityCryptographyConfiguration>
     Enterprise Library 4.1学习笔记6----加密应用程序块

3.接下来就可以测试了，关键地方已经加了注释

Cryptographer.DecryptSymmetric(symmProvider, lEncrypt.Text);
}
}
}

前端asp页

<%@ 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>

运行界面图：