asp.net用对称密钥为XML文件加密和解密

用对称密钥为XML文件加密和解密

xml文档如下

1 <?xml version="1.0" encoding="utf-8" ?>
2 <items>
3     <name>wjl</name>
4     <age>22</age>
5     <pwd>wjl123456</pwd>
6 </items>

加密后文档

1 <?xml version="1.0" encoding="utf-8"?>
2 <EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns="http://www.w3.org/2001/04/xmlenc#"><EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes256-cbc" /><CipherData><CipherValue>qKXdV+7yyVlzPoQSxUfw/KHIVqtnRYA2STTc81tx4c/x6qYmOluD29FJ8/V2HxRTcaKFFrvhWxQILlFRwwms/o89x49i0a8hn7cjw9K+JK3dNhKYZb/SdxwXDi8r59mi</CipherValue></CipherData></EncryptedData>

在这里先写下需要的引用吧

1 using System.Security.Cryptography;
2 using System.Security.Cryptography.Xml;
3 using System.Xml;
4 using System.Text;

加密方法：

//加密方法
    public void Encrypt(XmlDocument Doc, string ElementName, SymmetricAlgorithm Key)
    {
        XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementName)[0] as XmlElement;
        EncryptedXml eXml = new EncryptedXml();
        byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Key, false);
        EncryptedData edElement = new EncryptedData();
        edElement.Type = EncryptedXml.XmlEncElementUrl;
        string encryptionMethod = null;

        if (Key is TripleDES)
        {
            encryptionMethod = EncryptedXml.XmlEncTripleDESUrl;
        }
        else if (Key is DES)
        {
            encryptionMethod = EncryptedXml.XmlEncDESUrl;
        }
        if (Key is Rijndael)
        {
            switch (Key.KeySize)
            {
                case 128:
                    encryptionMethod = EncryptedXml.XmlEncAES128Url;
                    break;
                case 192:
                    encryptionMethod = EncryptedXml.XmlEncAES192Url;
                    break;
                case 256:
                    encryptionMethod = EncryptedXml.XmlEncAES256Url;
                    break;
            }
        }
        edElement.EncryptionMethod = new EncryptionMethod(encryptionMethod);
        edElement.CipherData.CipherValue = encryptedElement;
        EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
    }

解密方法：

1 public void Decrypt(XmlDocument Doc, SymmetricAlgorithm Alg)
2     {
3         XmlElement encryptedElement = Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement;
4         EncryptedData edElement = new EncryptedData();
5         edElement.LoadXml(encryptedElement);
6         EncryptedXml exml = new EncryptedXml();
7         byte[] rgbOutput = exml.DecryptData(edElement, Alg);
8         exml.ReplaceData(encryptedElement, rgbOutput);
9     }

加密按钮方法：

 1 protected void Button1_Click(object sender, EventArgs e)
 2     {
 3         RijndaelManaged key = new RijndaelManaged();
 4         //设置密钥:key为32位=数字或字母16个=汉字8个
 5         byte[] byteKey = Encoding.Unicode.GetBytes("1111111111111111");
 6         key.Key = byteKey;
 7         XmlDocument xmlDoc = new XmlDocument();
 8         xmlDoc.PreserveWhitespace = true;
 9         xmlDoc.Load(url+"XMLFile.xml");//加载要加密的XML文件
10         Encrypt(xmlDoc, "items", key);//需要加密的节点
11         if (key != null)
12         {
13             key.Clear();
14         }
15         xmlDoc.Save(url+"etest.xml");//生成加密后的XML文件
16         Response.Write("<script language=javascript>alert('加密OK');</script>");
17 
18     }

解密按钮方法：

 1  protected void Button2_Click(object sender, EventArgs e)
 2     {
 3         RijndaelManaged key = new RijndaelManaged();
 4         //设置密钥:key为32位=数字或字母16个=汉字8个
 5         byte[] byteKey = Encoding.Unicode.GetBytes("1111111111111111");
 6         key.Key = byteKey;
 7         XmlDocument xmlDoc = new XmlDocument();
 8         xmlDoc.PreserveWhitespace = true;
 9         xmlDoc.Load(url+"etest.xml");//加载要解密的XML文件
10         Decrypt(xmlDoc, key);
11         if (key != null)
12         {
13             key.Clear();
14         }
15         xmlDoc.Save(url+"eotest.xml");//生成解密后的XML文件
16         Response.Write("<script language=javascript>alert('解密OK');</script>");
17 
18     }

代码中存在url是我自定义一个绝对路径，否则默认会到vs的收藏夹中去xml文件，找不到会报错。

1 private string url ="E:\\asp.net\\xml加密\\";

代码贴的已经够细了，在不能使用此种方法加密和解密就罪过了！