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
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:
3.接下来就可以测试了，关键地方已经加了注释
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)
{
}
///
/// 生成Hash散列值
///
///
///
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);
}
///
/// 比较Hash散列值
///
///
///
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 = "该字符串未被篡改过!";
}
else
{
lCompare.Text = "该字符串被修改过了!";
}
}
}
///
/// 加密
///
///
///
protected void btnEncrypt_Click(object sender, EventArgs e)
{
lEncrypt.Text = Cryptographer.EncryptSymmetric(symmProvider, txtOriginal2.Text);
}
///
/// 解密
///
///
///
protected void btnDecrypt_Click(object sender, EventArgs e)
{
lDecrypt.Text = Cryptographer.DecryptSymmetric(symmProvider, lEncrypt.Text);
}
}
}
前端asp页
html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
运行界面图：
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/3536/viewspace-2801273/ ，如需转载，请注明出处，否则将追究法律责任。
