EncryptionProperty 类
定义
重要
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表示 XML 加密中使用的 <EncryptionProperty> 元素。 此类不能被继承。
public ref class EncryptionProperty sealedpublic sealed class EncryptionPropertytype EncryptionProperty = classPublic NotInheritable Class EncryptionProperty- 继承
-
EncryptionProperty
示例
下面的代码示例对 XML 文档进行加密和解密。 此代码示例创建一个EncryptionProperty对象，该对象包含有关元素的EncryptedKey自定义信息，并将该对象添加到EncryptionPropertyEncryptionPropertyCollection类的EncryptedXml集合中。 最后，此代码示例显示有关 EncryptionProperty 对象和 EncryptionPropertyCollection 集合的信息。
using System;
using System.Xml;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
class Program
{
static void Main(string[] args)
{
// Create an XmlDocument object.
XmlDocument xmlDoc = new XmlDocument();
// Load an XML file into the XmlDocument object.
try
{
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load("test.xml");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
// Create a new RSA key. This key will encrypt a symmetric key,
// which will then be imbedded in the XML document.
RSA rsaKey = RSA.Create();
try
{
// Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", rsaKey, "rsaKey");
// Inspect the EncryptedKey element.
InspectElement(xmlDoc);
// Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
// Clear the RSA key.
rsaKey.Clear();
}
}
public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, RSA Alg, string KeyName)
{
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (ElementToEncrypt == null)
throw new ArgumentNullException("ElementToEncrypt");
if (Alg == null)
throw new ArgumentNullException("Alg");
////////////////////////////////////////////////
// Find the specified element in the XmlDocument
// object and create a new XmlElemnt object.
////////////////////////////////////////////////
XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementToEncrypt)[0] as XmlElement;
// Throw an XmlException if the element was not found.
if (elementToEncrypt == null)
{
throw new XmlException("The specified element was not found");
}
//////////////////////////////////////////////////
// Create a new instance of the EncryptedXml class
// and use it to encrypt the XmlElement with the
// a new random symmetric key.
//////////////////////////////////////////////////
// Create a 256 bit Aes key.
Aes sessionKey = Aes.Create();
sessionKey.KeySize = 256;
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false);
////////////////////////////////////////////////
// Construct an EncryptedData object and populate
// it with the desired encryption information.
////////////////////////////////////////////////
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
// Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url);
// Encrypt the session key and add it to an EncryptedKey element.
EncryptedKey ek = new EncryptedKey();
byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, Alg, false);
ek.CipherData = new CipherData(encryptedKey);
ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url);
// Save some more information about the key using
// the EncryptionProperty element. In this example,
// we will save the value "LibVersion1". You can save
// anything you want here.
// Create a new "EncryptionProperty" XmlElement object.
XmlElement element = new XmlDocument().CreateElement("EncryptionProperty", EncryptedXml.XmlEncNamespaceUrl);
// Set the value of the EncryptionProperty" XmlElement object.
element.InnerText = "LibVersion1";
// Create the EncryptionProperty object using the XmlElement object.
EncryptionProperty encProp = new EncryptionProperty(element);
// Add the EncryptionProperty object to the EncryptedData object.
edElement.AddProperty(encProp);
// Set the KeyInfo element to specify the
// name of the RSA key.
// Create a new KeyInfo element.
edElement.KeyInfo = new KeyInfo();
// Create a new KeyInfoName element.
KeyInfoName kin = new KeyInfoName();
// Specify a name for the key.
kin.Value = KeyName;
// Add the KeyInfoName element to the
// EncryptedKey object.
ek.KeyInfo.AddClause(kin);
// Add the encrypted key to the
// EncryptedData object.
edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));
// Add the encrypted element data to the
// EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
////////////////////////////////////////////////////
// Replace the element from the original XmlDocument
// object with the EncryptedData element.
////////////////////////////////////////////////////
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
}
public static void Decrypt(XmlDocument Doc, RSA Alg, string KeyName)
{
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (Alg == null)
throw new ArgumentNullException("Alg");
if (KeyName == null)
throw new ArgumentNullException("KeyName");
// Create a new EncryptedXml object.
EncryptedXml exml = new EncryptedXml(Doc);
// Add a key-name mapping.
// This method can only decrypt documents
// that present the specified key name.
exml.AddKeyNameMapping(KeyName, Alg);
// Decrypt the element.
exml.DecryptDocument();
}
static void InspectElement(XmlDocument Doc)
{
// Get the EncryptedData element from the XMLDocument object.
XmlElement encryptedData = Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement;
// Create a new EncryptedData object.
EncryptedData encData = new EncryptedData();
// Load the XML from the document to
// initialize the EncryptedData object.
encData.LoadXml(encryptedData);
// Display the properties.
// Most values are Null by default.
Console.WriteLine("EncryptedData.CipherData: " + encData.CipherData.GetXml().InnerXml);
Console.WriteLine("EncryptedData.Encoding: " + encData.Encoding);
Console.WriteLine("EncryptedData.EncryptionMethod: " + encData.EncryptionMethod.GetXml().InnerXml);
EncryptionPropertyCollection encPropCollection = encData.EncryptionProperties;
Console.WriteLine("Number of elements in the EncryptionPropertyCollection: " + encPropCollection.Count);
//encPropCollection.
foreach(EncryptionProperty encProp in encPropCollection)
{
Console.WriteLine("EncryptionProperty.ID: " + encProp.Id);
Console.WriteLine("EncryptionProperty.PropertyElement: " + encProp.PropertyElement.InnerXml);
Console.WriteLine("EncryptionProperty.Target: " + encProp.Target);
}
Console.WriteLine("EncryptedData.Id: " + encData.Id);
Console.WriteLine("EncryptedData.KeyInfo: " + encData.KeyInfo.GetXml().InnerXml);
Console.WriteLine("EncryptedData.MimeType: " + encData.MimeType);
}
}
Imports System.Xml
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml
Module Program
Sub Main(ByVal args() As String)
' Create an XmlDocument object.
Dim xmlDoc As New XmlDocument()
' Load an XML file into the XmlDocument object.
Try
xmlDoc.PreserveWhitespace = True
xmlDoc.Load("test.xml")
Catch e As Exception
Console.WriteLine(e.Message)
End Try
' Create a new RSA key. This key will encrypt a symmetric key,
' which will then be imbedded in the XML document.
Dim rsaKey As RSA = RSA.Create()
Try
' Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", rsaKey, "rsaKey")
' Inspect the EncryptedKey element.
InspectElement(xmlDoc)
' Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey")
Catch e As Exception
Console.WriteLine(e.Message)
Finally
' Clear the RSA key.
rsaKey.Clear()
End Try
End Sub
Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncryptValue As String, ByVal Alg As RSA, ByVal KeyName As String)
' Check the arguments.
If Doc Is Nothing Then
Throw New ArgumentNullException("Doc")
End If
If ElementToEncryptValue Is Nothing Then
Throw New ArgumentNullException("ElementToEncrypt")
End If
If Alg Is Nothing Then
Throw New ArgumentNullException("Alg")
End If
''''''''''''''''''''''''''''''''''''''''''''''''''
' Find the specified element in the XmlDocument
' object and create a new XmlElemnt object.
''''''''''''''''''''''''''''''''''''''''''''''''''
Dim elementToEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncryptValue)(0)
' Throw an XmlException if the element was not found.
If elementToEncrypt Is Nothing Then
Throw New XmlException("The specified element was not found")
End If
''''''''''''''''''''''''''''''''''''''''''''''''''
' Create a new instance of the EncryptedXml class
' and use it to encrypt the XmlElement with the
' a new random symmetric key.
''''''''''''''''''''''''''''''''''''''''''''''''''
' Create a 256 bit Aes key.
Dim sessionKey As Aes = Aes.Create()
sessionKey.KeySize = 256
Dim eXml As New EncryptedXml()
Dim encryptedElement As Byte() = eXml.EncryptData(elementToEncrypt, sessionKey, False)
''''''''''''''''''''''''''''''''''''''''''''''''''
' Construct an EncryptedData object and populate
' it with the desired encryption information.
''''''''''''''''''''''''''''''''''''''''''''''''''
Dim edElement As New EncryptedData()
edElement.Type = EncryptedXml.XmlEncElementUrl
' Create an EncryptionMethod element so that the
' receiver knows which algorithm to use for decryption.
edElement.EncryptionMethod = New EncryptionMethod(EncryptedXml.XmlEncAES256Url)
' Encrypt the session key and add it to an EncryptedKey element.
Dim ek As New EncryptedKey()
Dim encryptedKey As Byte() = EncryptedXml.EncryptKey(sessionKey.Key, Alg, False)
ek.CipherData = New CipherData(encryptedKey)
ek.EncryptionMethod = New EncryptionMethod(EncryptedXml.XmlEncRSA15Url)
' Save some more information about the key using
' the EncryptionProperty element. In this example,
' we will save the value "LibVersion1". You can save
' anything you want here.
' Create a new "EncryptionProperty" XmlElement object.
Dim element As XmlElement = New XmlDocument().CreateElement("EncryptionProperty", EncryptedXml.XmlEncNamespaceUrl)
' Set the value of the EncryptionProperty" XmlElement object.
element.InnerText = "LibVersion1"
' Create the EncryptionProperty object using the XmlElement object.
Dim encProp As New EncryptionProperty(element)
' Add the EncryptionProperty object to the EncryptedData object.
edElement.AddProperty(encProp)
' Set the KeyInfo element to specify the
' name of the RSA key.
' Create a new KeyInfo element.
edElement.KeyInfo = New KeyInfo()
' Create a new KeyInfoName element.
Dim kin As New KeyInfoName()
' Specify a name for the key.
kin.Value = KeyName
' Add the KeyInfoName element to the
' EncryptedKey object.
ek.KeyInfo.AddClause(kin)
' Add the encrypted key to the
' EncryptedData object.
edElement.KeyInfo.AddClause(New KeyInfoEncryptedKey(ek))
' Add the encrypted element data to the
' EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement
''''''''''''''''''''''''''''''''''''''''''''''''''
' Replace the element from the original XmlDocument
' object with the EncryptedData element.
''''''''''''''''''''''''''''''''''''''''''''''''''
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, False)
End Sub
Sub Decrypt(ByVal Doc As XmlDocument, ByVal Alg As RSA, ByVal KeyName As String)
' Check the arguments.
If Doc Is Nothing Then
Throw New ArgumentNullException("Doc")
End If
If Alg Is Nothing Then
Throw New ArgumentNullException("Alg")
End If
If KeyName Is Nothing Then
Throw New ArgumentNullException("KeyName")
End If
' Create a new EncryptedXml object.
Dim exml As New EncryptedXml(Doc)
' Add a key-name mapping.
' This method can only decrypt documents
' that present the specified key name.
exml.AddKeyNameMapping(KeyName, Alg)
' Decrypt the element.
exml.DecryptDocument()
End Sub
Sub InspectElement(ByVal Doc As XmlDocument)
' Get the EncryptedData element from the XMLDocument object.
Dim encryptedData As XmlElement = Doc.GetElementsByTagName("EncryptedData")(0)
' Create a new EncryptedData object.
Dim encData As New EncryptedData()
' Load the XML from the document to
' initialize the EncryptedData object.
encData.LoadXml(encryptedData)
' Display the properties.
' Most values are Null by default.
Console.WriteLine("EncryptedData.CipherData: " + encData.CipherData.GetXml().InnerXml)
Console.WriteLine("EncryptedData.Encoding: " + encData.Encoding)
Console.WriteLine("EncryptedData.EncryptionMethod: " + encData.EncryptionMethod.GetXml().InnerXml)
Dim encPropCollection As EncryptionPropertyCollection = encData.EncryptionProperties
Console.WriteLine("Number of elements in the EncryptionPropertyCollection: " + encPropCollection.Count.ToString())
'encPropCollection.
Dim encProp As EncryptionProperty
For Each encProp In encPropCollection
Console.WriteLine("EncryptionProperty.ID: " + encProp.Id)
Console.WriteLine("EncryptionProperty.PropertyElement: " + encProp.PropertyElement.InnerXml)
Console.WriteLine("EncryptionProperty.Target: " + encProp.Target)
Next encProp
Console.WriteLine("EncryptedData.Id: " + encData.Id)
Console.WriteLine("EncryptedData.KeyInfo: " + encData.KeyInfo.GetXml().InnerXml)
Console.WriteLine("EncryptedData.MimeType: " + encData.MimeType)
End Sub
End Module
注解
该 EncryptionProperty 类封装 <EncryptionProperty> 万维网联盟 XML 加密语法和处理 规范定义的元素。
使用该 EncryptionProperty 类提供与 EncryptedData 元素 EncryptedKey 相关的其他加密信息。 例如，使用此类指定时间戳。
构造函数
| EncryptionProperty() |
初始化 EncryptionProperty 类的新实例。 |
| EncryptionProperty(XmlElement) |
使用 XmlElement 对象初始化 EncryptionProperty 类的新实例。 |
属性
| Id |
获取当前 EncryptionProperty 对象的 ID。 |
| PropertyElement |
获取或设置表示 XmlElement 对象的 EncryptionProperty 对象。 |
| Target |
获取 EncryptionProperty 对象的目标。 |
方法
| Equals(Object) |
确定指定对象是否等于当前对象。 (继承自 Object) |
| GetHashCode() |
作为默认哈希函数。 (继承自 Object) |
| GetType() |
获取当前实例的 Type。 (继承自 Object) |
| GetXml() |
返回一个 XmlElement 对象，该对象封装了 EncryptionProperty 类的实例。 |
| LoadXml(XmlElement) |
分析输入的 XmlElement 并配置要匹配的 EncryptionProperty 对象的内部状态。 |
| MemberwiseClone() |
创建当前 Object 的浅表副本。 (继承自 Object) |
| ToString() |
返回表示当前对象的字符串。 (继承自 Object) |