CipherReference 类

参考

定义

命名空间:: System.Security.Cryptography.Xml

程序集:: System.Security.Cryptography.Xml.dll

程序集:: System.Security.dll

包:: System.Security.Cryptography.Xml v8.0.0

包:: System.Security.Cryptography.Xml v9.0.0-preview.3.24172.9

Source:: CipherReference.cs

Source:: CipherReference.cs

Source:: CipherReference.cs

Source:: CipherReference.cs

重要

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表示 XML 加密中的 <CipherReference> 元素。此类不能被继承。

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

CipherReference()	初始化 CipherReference 类的新实例。
CipherReference(String)	使用指定的统一资源标识符 (URI) 初始化 CipherReference 类的新实例。
CipherReference(String, TransformChain)	使用指定的统一资源标识符 (URI) 和转换链信息初始化 CipherReference 类的新实例。

属性

CacheValid	获取一个值，该值指示高速缓存是否有效。 (继承自 EncryptedReference)
ReferenceType	获取或设置引用类型。 (继承自 EncryptedReference)
TransformChain	获取或设置 EncryptedReference 对象的转换链。 (继承自 EncryptedReference)
Uri	获取或设置 EncryptedReference 对象的统一资源标识符 (URI)。 (继承自 EncryptedReference)

方法

AddTransform(Transform)	将 Transform 对象添加到 EncryptedReference 对象的当前转换链中。 (继承自 EncryptedReference)
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 CipherReference 对象的 XML 表示形式。
LoadXml(XmlElement)	将 XML 信息加载到 XML 加密的 `<CipherReference>` 元素中。
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)

适用于

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CipherReference 类

定义

示例

注解

构造函数

属性

方法

适用于

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