CipherReference 类

定义

public ref class CipherReference sealed : System::Security::Cryptography::Xml::EncryptedReference

public sealed class CipherReference : System.Security.Cryptography.Xml.EncryptedReference

type CipherReference = class
    inherit EncryptedReference

Public NotInheritable Class CipherReference
Inherits EncryptedReference

继承

Object

EncryptedReference

CipherReference

示例

下面的代码示例创建 的新 CipherReference实例。

#using <System.Xml.dll>
#using <System.Security.dll>
#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography::Xml;
using namespace System::Xml;
using namespace System::IO;

/// This sample used the EncryptedData class to create an encrypted data element
/// and write it to an XML file. It demonstrates the use of CipherReference.

[STAThread]
int main()
{
   
   //Create a URI string.
   String^ uri = "http://www.woodgrovebank.com/document.xml";
   
   // Create a Base64 transform. The input content retrieved from the
   // URI should be Base64-decoded before other processing.
   Transform^ base64 = gcnew XmlDsigBase64Transform;
   
   //Create a transform chain and add the transform to it.
   TransformChain^ tc = gcnew TransformChain;
   tc->Add( base64 );
   
   //Create <CipherReference> information.
   CipherReference ^ reference = gcnew CipherReference( uri,tc );
   
   // Create a new CipherData object using the CipherReference information.
   // Note that you cannot assign both a CipherReference and a CipherValue
   // to a CipherData object.
   CipherData ^ cd = gcnew CipherData( reference );
   
   // Create a new EncryptedData object.
   EncryptedData^ ed = gcnew EncryptedData;
   
   //Add an encryption method to the object.
   ed->Id = "ED";
   ed->EncryptionMethod = gcnew EncryptionMethod( "http://www.w3.org/2001/04/xmlenc#aes128-cbc" );
   ed->CipherData = cd;
   
   //Add key information to the object.
   KeyInfo^ ki = gcnew KeyInfo;
   ki->AddClause( gcnew KeyInfoRetrievalMethod( "#EK","http://www.w3.org/2001/04/xmlenc#EncryptedKey" ) );
   ed->KeyInfo = ki;
   
   // Create new XML document and put encrypted data into it.
   XmlDocument^ doc = gcnew XmlDocument;
   XmlElement^ encryptionPropertyElement = dynamic_cast<XmlElement^>(doc->CreateElement( "EncryptionProperty", EncryptedXml::XmlEncNamespaceUrl ));
   EncryptionProperty ^ ep = gcnew EncryptionProperty( encryptionPropertyElement );
   ed->AddProperty( ep );
   
   // Output the resulting XML information into a file.
   try
   {
      String^ path = "c:\\test\\MyTest.xml";
      File::WriteAllText( path, ed->GetXml()->OuterXml );
   }
   catch ( IOException^ e ) 
   {
      Console::WriteLine( "File IO error. {0}", e );
   }

}

using System;
using System.Security.Cryptography.Xml;
using System.Xml;
using System.IO;

/// This sample used the EncryptedData class to create an encrypted data element
/// and write it to an XML file. It demonstrates the use of CipherReference.
namespace EncryptedDataSample
{
    class Example
    {
        [STAThread]
        static void Main(string[] args)
        {
            //Create a URI string.
            String uri = "http://www.woodgrovebank.com/document.xml";
            // Create a Base64 transform. The input content retrieved from the
            // URI should be Base64-decoded before other processing.
            Transform base64 = new XmlDsigBase64Transform();
            //Create a transform chain and add the transform to it.
            TransformChain tc = new TransformChain();
            tc.Add(base64);
            //Create <CipherReference> information.
            CipherReference reference = new CipherReference(uri, tc);

            // Create a new CipherData object using the CipherReference information.
            // Note that you cannot assign both a CipherReference and a CipherValue
            // to a CipherData object.
            CipherData cd = new CipherData(reference);

            // Create a new EncryptedData object.
            EncryptedData ed = new EncryptedData();

            //Add an encryption method to the object.
            ed.Id = "ED";
            ed.EncryptionMethod = new EncryptionMethod("http://www.w3.org/2001/04/xmlenc#aes128-cbc");
            ed.CipherData = cd;

            //Add key information to the object.
            KeyInfo ki = new KeyInfo();
            ki.AddClause(new KeyInfoRetrievalMethod("#EK", "http://www.w3.org/2001/04/xmlenc#EncryptedKey"));
            ed.KeyInfo = ki;

            // Create new XML document and put encrypted data into it.
            XmlDocument doc = new XmlDocument();
            XmlElement encryptionPropertyElement = (XmlElement)doc.CreateElement("EncryptionProperty", EncryptedXml.XmlEncNamespaceUrl);
            EncryptionProperty ep = new EncryptionProperty(encryptionPropertyElement);
            ed.AddProperty(ep);

            // Output the resulting XML information into a file.
            try
            {
                string path = @"c:\test\MyTest.xml";

                File.WriteAllText(path, ed.GetXml().OuterXml);
            }
            catch (IOException e)
            {
                Console.WriteLine("File IO error. {0}", e);
            }
        }
    }
}

Imports System.Security.Cryptography.Xml
Imports System.Xml
Imports System.IO


'/ This sample used the EncryptedData class to create a EncryptedData element
'/ and write it to an XML file. It demonstrates the use of CipherReference.
Module Module1

    Sub Main()
        ' Create a URI string.
        Dim uri As String = "http://www.woodgrovebank.com/document.xml"
        ' Create a Base64 transform. The input content retrieved from the
        ' URI should be Base64-decoded before other processing.
        Dim base64 As Transform = New XmlDsigBase64Transform
        Dim tc As New TransformChain
        tc.Add(base64)
        ' Create <CipherReference> information.
        Dim reference As CipherReference = New CipherReference(uri, tc)

        ' Create a new CipherData object.
        ' Note that you cannot assign both a CipherReference and a CipherValue
        ' to a CipherData object.
        Dim cd As CipherData = New CipherData(Reference)

        ' Create a new EncryptedData object.
        Dim ed As New EncryptedData

        'Add an encryption method to the object.
        ed.Id = "ED"
        ed.EncryptionMethod = New EncryptionMethod("http://www.w3.org/2001/04/xmlenc#aes128-cbc")
        ed.CipherData = cd

        'Add key information to the object.
        Dim ki As New KeyInfo
        ki.AddClause(New KeyInfoRetrievalMethod("#EK", "http://www.w3.org/2001/04/xmlenc#EncryptedKey"))
        ed.KeyInfo = ki

        ' Create new XML document and put encrypted data into it.
        Dim doc As New XmlDocument
        Dim encryptionPropertyElement As XmlElement = CType(doc.CreateElement("EncryptionProperty", EncryptedXml.XmlEncNamespaceUrl), XmlElement)
        Dim ep As New EncryptionProperty(encryptionPropertyElement)
        ed.AddProperty(ep)

        ' Output the resulting XML information into a file.
        Dim path As String = "c:\test\MyTest.xml"
        File.WriteAllText(path, ed.GetXml().OuterXml)
    End Sub

End Module

注解

此类表示 <CipherReference> XML 加密中的 元素。 它标识一个源，该源在处理时生成加密数据。

引用的实际加密数据 <CipherReference> 由以下进程获取。 属性 <CipherReference> URI 包含取消引用的统一资源标识符 (URI) 。 <CipherReference>如果 元素还包含转换链，则会按指定的方式转换通过取消引用 URI 生成的数据，以生成加密数据。 例如，如果加密数据在 XML 文档中采用 base64 编码，则转换将指定 XPath 表达式，后跟 base64 解码，以便可以提取加密数据。

URI 和转换的语法类似于 XML 数字签名的语法。 但是，在 XML 数字签名中，生成和验证处理都从相同的源数据开始，并按相同的顺序执行转换。 在 XML 加密中，解密应用程序只有加密的数据和指定的转换。 转换按获取加密数据所需的顺序进行枚举。

注意 默认情况下，无法取消引用来自源未知的文档（例如网站中的文件）的密码引用，因为 DocumentEvidence 属性为 null。 例如，尝试解密包含 <CipherReference> 引用 Web 上的文件的元素的文件时， SecurityException 即使请求是由完全受信任的程序集发出的，也会引发 。

如果确定要解密的文档可以受信任，则可以使用以下代码更改完全受信任的应用程序的此行为：

Evidence ev = new Evidence();  
ev.AddHost (new Zone(SecurityZone.MyComputer));  
EncryptedXml exml = new EncryptedXml(doc, ev);  

构造函数

属性

方法

适用于