EncryptedXml.Encrypt Methode

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

public:
 System::Security::Cryptography::Xml::EncryptedData ^ Encrypt(System::Xml::XmlElement ^ inputElement, System::Security::Cryptography::X509Certificates::X509Certificate2 ^ certificate);

public System.Security.Cryptography.Xml.EncryptedData Encrypt (System.Xml.XmlElement inputElement, System.Security.Cryptography.X509Certificates.X509Certificate2 certificate);

member this.Encrypt : System.Xml.XmlElement * System.Security.Cryptography.X509Certificates.X509Certificate2 -> System.Security.Cryptography.Xml.EncryptedData

Public Function Encrypt (inputElement As XmlElement, certificate As X509Certificate2) As EncryptedData

Parameter

Gibt zurück

Ein EncryptedData-Element, das die verschlüsselten XML-Daten darstellt.

Ausnahmen

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie ein XML-Dokument mithilfe eines X.509-Zertifikats verschlüsselt wird. In diesem Beispiel wird ein symmetrischer Sitzungsschlüssel zum Verschlüsseln des Dokuments erstellt, und anschließend wird das X.509-Zertifikat verwendet, um eine verschlüsselte Version des Sitzungsschlüssels in das XML-Dokument einzubetten.

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

using namespace System;
using namespace System::Xml;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::Xml;
using namespace System::Security::Cryptography::X509Certificates;
static void Encrypt( XmlDocument^ Doc, String^ ElementToEncrypt, X509Certificate2^ Cert )
{

   // Check the arguments.
   if ( Doc == nullptr )
      throw gcnew ArgumentNullException( L"Doc" );

   if ( ElementToEncrypt == nullptr )
      throw gcnew ArgumentNullException( L"ElementToEncrypt" );

   if ( Cert == nullptr )
      throw gcnew ArgumentNullException( L"Cert" );


   ////////////////////////////////////////////////
   // Find the specified element in the XmlDocument
   // object and create a new XmlElemnt object.
   ////////////////////////////////////////////////
   XmlElement^ elementToEncrypt = dynamic_cast<XmlElement^>(Doc->GetElementsByTagName( ElementToEncrypt )->Item( 0 ));

   // Throw an XmlException if the element was not found.
   if ( elementToEncrypt == nullptr )
   {
      throw gcnew XmlException( L"The specified element was not found" );
   }


   //////////////////////////////////////////////////
   // Create a new instance of the EncryptedXml class
   // and use it to encrypt the XmlElement with the
   // X.509 Certificate.
   //////////////////////////////////////////////////
   EncryptedXml^ eXml = gcnew EncryptedXml;

   // Encrypt the element.
   EncryptedData^ edElement = eXml->Encrypt( elementToEncrypt, Cert );

   ////////////////////////////////////////////////////
   // Replace the element from the original XmlDocument
   // object with the EncryptedData element.
   ////////////////////////////////////////////////////
   EncryptedXml::ReplaceElement( elementToEncrypt, edElement, false );
}

static void Decrypt( XmlDocument^ Doc )
{

   // Check the arguments.
   if ( Doc == nullptr )
      throw gcnew ArgumentNullException( L"Doc" );


   // Create a new EncryptedXml object.
   EncryptedXml^ exml = gcnew EncryptedXml( Doc );

   // Decrypt the XML document.
   exml->DecryptDocument();
}

int main()
{

   // Create an XmlDocument object.
   XmlDocument^ xmlDoc = gcnew XmlDocument;

   // Load an XML file into the XmlDocument object.
   try
   {
      xmlDoc->PreserveWhitespace = true;
      xmlDoc->Load( L"test.xml" );
   }
   catch ( Exception^ e )
   {
      Console::WriteLine( e->Message );
      return 0;
   }


   // Create a new X509Certificate2 object by loading
   // an X.509 certificate file.  To use XML encryption
   // with an X.509 certificate, use an X509Certificate2
   // object to encrypt, but use a certificate in a certificate
   // store to decrypt.
   // You can create a new test certificate file using the
   // makecert.exe tool.
   // Create an X509Certificate2 object for encryption.
   X509Certificate2^ cert = gcnew X509Certificate2( L"test.pfx" );

   // Put the certificate in certificate store for decryption.
   X509Store^ store = gcnew X509Store( StoreLocation::CurrentUser );
   store->Open( OpenFlags::ReadWrite );
   store->Add( cert );
   store->Close();
   try
   {

      // Encrypt the "creditcard" element.
      Encrypt( xmlDoc, L"creditcard", cert );

      // Display the encrypted XML to the console.
      Console::WriteLine( L"Encrypted XML:" );
      Console::WriteLine();
      Console::WriteLine( xmlDoc->OuterXml );

      // Decrypt the "creditcard" element.
      Decrypt( xmlDoc );

      // Display the encrypted XML to the console.
      Console::WriteLine();
      Console::WriteLine( L"Decrypted XML:" );
      Console::WriteLine();
      Console::WriteLine( xmlDoc->OuterXml );
   }
   catch ( Exception^ e )
   {
      Console::WriteLine( e->Message );
   }

   return 1;
}

using System;
using System.Xml;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Security.Cryptography.X509Certificates;

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);
            return;
        }

        // Create a new X509Certificate2 object by loading
        // an X.509 certificate file.  To use XML encryption
        // with an X.509 certificate, use an X509Certificate2
        // object to encrypt, but use a certificate in a certificate
        // store to decrypt.

        // You can create a new test certificate file using the
        // makecert.exe tool.

        // Create an X509Certificate2 object for encryption.
        X509Certificate2 cert = new X509Certificate2("test.pfx");

        // Put the certificate in certificate store for decryption.
        X509Store store = new X509Store(StoreLocation.CurrentUser);

        store.Open(OpenFlags.ReadWrite);

        store.Add(cert);

        store.Close();

        try
        {
            // Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", cert);

            // Display the encrypted XML to the console.
            Console.WriteLine("Encrypted XML:");
            Console.WriteLine();
            Console.WriteLine(xmlDoc.OuterXml);

            // Decrypt the "creditcard" element.
            Decrypt(xmlDoc);

            // Display the encrypted XML to the console.
            Console.WriteLine();
            Console.WriteLine("Decrypted XML:");
            Console.WriteLine();
            Console.WriteLine(xmlDoc.OuterXml);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, X509Certificate2 Cert)
    {
        // Check the arguments.
        if (Doc == null)
            throw new ArgumentNullException("Doc");
        if (ElementToEncrypt == null)
            throw new ArgumentNullException("ElementToEncrypt");
        if (Cert == null)
            throw new ArgumentNullException("Cert");

        ////////////////////////////////////////////////
        // 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
        // X.509 Certificate.
        //////////////////////////////////////////////////

        EncryptedXml eXml = new EncryptedXml();

        // Encrypt the element.
        EncryptedData edElement = eXml.Encrypt(elementToEncrypt, Cert);

        ////////////////////////////////////////////////////
        // Replace the element from the original XmlDocument
        // object with the EncryptedData element.
        ////////////////////////////////////////////////////

        EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
    }

    public static void Decrypt(XmlDocument Doc)
    {
        // Check the arguments.
        if (Doc == null)
            throw new ArgumentNullException("Doc");

        // Create a new EncryptedXml object.
        EncryptedXml exml = new EncryptedXml(Doc);

        // Decrypt the XML document.
        exml.DecryptDocument();
    }
}

Imports System.Xml
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml
Imports System.Security.Cryptography.X509Certificates



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)
            Return
        End Try

        ' Create a new X509Certificate2 object by loading
        ' an X.509 certificate file.  To use XML encryption 
        ' with an X.509 certificate, use an X509Certificate2 
        ' object to encrypt, but use a certificate in a certificate
        ' store to decrypt.
        ' You can create a new test certificate file using the 
        ' makecert.exe tool.
        ' Create an X509Certificate2 object for encryption.
        Dim cert As New X509Certificate2("test.pfx")

        ' Put the certificate in certificate store for decryption.  
        Dim store As New X509Store(StoreLocation.CurrentUser)

        store.Open(OpenFlags.ReadWrite)

        store.Add(cert)

        store.Close()


        Try
            ' Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", cert)

            ' Display the encrypted XML to the console.
            Console.WriteLine("Encrypted XML:")
            Console.WriteLine()
            Console.WriteLine(xmlDoc.OuterXml)

            ' Decrypt the "creditcard" element.
            Decrypt(xmlDoc)

            ' Display the encrypted XML to the console.
            Console.WriteLine()
            Console.WriteLine("Decrypted XML:")
            Console.WriteLine()
            Console.WriteLine(xmlDoc.OuterXml)
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try

    End Sub


    Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncrypt As String, ByVal Cert As X509Certificate2)
        ' Check the arguments.  
        If Doc Is Nothing Then
            Throw New ArgumentNullException("Doc")
        End If
        If ElementToEncrypt Is Nothing Then
            Throw New ArgumentNullException("ElementToEncrypt")
        End If
        If Cert Is Nothing Then
            Throw New ArgumentNullException("Cert")
        End If
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        ' Find the specified element in the XmlDocument
        ' object and create a new XmlElemnt object.
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        Dim elementEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncrypt)(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 
        ' X.509 Certificate.
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        Dim eXml As New EncryptedXml()

        ' Encrypt the element.
        Dim edElement As EncryptedData = eXml.Encrypt(elementEncrypt, Cert)


        '''''''''''''''''''''''''''''''''''''''''''''''''''
        ' Replace the element from the original XmlDocument
        ' object with the EncryptedData element.
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        EncryptedXml.ReplaceElement(elementEncrypt, edElement, False)

    End Sub


    Sub Decrypt(ByVal Doc As XmlDocument)
        ' Check the arguments.  
        If Doc Is Nothing Then
            Throw New ArgumentNullException("Doc")
        End If
        ' Create a new EncryptedXml object.
        Dim exml As New EncryptedXml(Doc)

        ' Decrypt the XML document.
        exml.DecryptDocument()

    End Sub
End Module

Hinweise

Die Encrypt -Methode ist eine praktische Möglichkeit, die äußere XML eines Elements mithilfe eines Zertifikats zu verschlüsseln. Diese Methode generiert einen 256-Bit-AES-Sitzungsschlüssel (Advanced Encryption Standard), um ein XML-Element zu verschlüsseln, und verschlüsselt und signiert dann den AES-Schlüssel mithilfe des X509Certificate2 -Objekts. Die Encrypt -Methode gibt dann den resultierenden XML-Code als Element zurück EncryptedData .

Wenn Sie mehr Kontrolle über die Verschlüsselung benötigen, damit Sie die verschlüsselten Informationen in einem <CipherReference> Element platzieren oder angeben können, ob das gesamte XML-Element oder nur dessen Inhalt verschlüsselt werden soll, verwenden Sie die EncryptData Methodenüberladungen.

Um DIE XML-Verschlüsselung mit X.509-Zertifikaten verwenden zu können, müssen Sie den Microsoft Enhanced Cryptographic Provider installiert haben, und das X.509-Zertifikat muss den erweiterten Anbieter verwenden. Wenn Sie den microsoft Enhanced Cryptographic Provider nicht installiert haben oder das X.509-Zertifikat den erweiterten Anbieter nicht verwendet, wird beim Entschlüsseln eines XML-Dokuments ein CryptographicException mit "Unbekannter Fehler" ausgelöst.

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

Quelle:

EncryptedXml.cs

public:
 System::Security::Cryptography::Xml::EncryptedData ^ Encrypt(System::Xml::XmlElement ^ inputElement, System::String ^ keyName);

public System.Security.Cryptography.Xml.EncryptedData Encrypt (System.Xml.XmlElement inputElement, string keyName);

member this.Encrypt : System.Xml.XmlElement * string -> System.Security.Cryptography.Xml.EncryptedData

Public Function Encrypt (inputElement As XmlElement, keyName As String) As EncryptedData

Parameter

Gibt zurück

Ein EncryptedData-Objekt, das die verschlüsselten XML-Daten darstellt.

Ausnahmen

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie ein XML-Dokument mithilfe eines symmetrischen Schlüssels verschlüsselt wird.

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

using namespace System;
using namespace System::Xml;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::Xml;
static void Encrypt( XmlDocument^ Doc, String^ ElementToEncrypt, SymmetricAlgorithm^ Alg, String^ KeyName )
{
   
   // Check the arguments.  
   if ( Doc == nullptr )
      throw gcnew ArgumentNullException( L"Doc" );

   if ( ElementToEncrypt == nullptr )
      throw gcnew ArgumentNullException( L"ElementToEncrypt" );

   if ( Alg == nullptr )
      throw gcnew ArgumentNullException( L"Alg" );

   
   ////////////////////////////////////////////////
   // Find the specified element in the XmlDocument
   // object and create a new XmlElemnt object.
   ////////////////////////////////////////////////
   XmlElement^ elementToEncrypt = dynamic_cast<XmlElement^>(Doc->GetElementsByTagName( ElementToEncrypt )->Item( 0 ));
   
   // Throw an XmlException if the element was not found.
   if ( elementToEncrypt == nullptr )
   {
      throw gcnew XmlException( L"The specified element was not found" );
   }

   
   //////////////////////////////////////////////////
   // Create a new instance of the EncryptedXml class 
   // and use it to encrypt the XmlElement with the 
   // symmetric key.
   //////////////////////////////////////////////////
   EncryptedXml^ eXml = gcnew EncryptedXml;
   
   // Add the key mapping.
   eXml->AddKeyNameMapping( KeyName, Alg );
   
   // Encrypt the element.
   EncryptedData^ edElement = eXml->Encrypt( elementToEncrypt, KeyName );
   
   ////////////////////////////////////////////////////
   // Replace the element from the original XmlDocument
   // object with the EncryptedData element.
   ////////////////////////////////////////////////////
   EncryptedXml::ReplaceElement( elementToEncrypt, edElement, false );
}

static void Decrypt( XmlDocument^ Doc, SymmetricAlgorithm^ Alg, String^ KeyName )
{
   
   // Check the arguments.  
   if ( Doc == nullptr )
      throw gcnew ArgumentNullException( L"Doc" );

   if ( Alg == nullptr )
      throw gcnew ArgumentNullException( L"Alg" );

   if ( KeyName == nullptr )
      throw gcnew ArgumentNullException( L"KeyName" );

   
   // Create a new EncryptedXml object.
   EncryptedXml^ exml = gcnew EncryptedXml( Doc );
   
   // Add the key name mapping.
   exml->AddKeyNameMapping( KeyName, Alg );
   
   // Decrypt the XML document.
   exml->DecryptDocument();
}

int main()
{
   
   // Create an XmlDocument object.
   XmlDocument^ xmlDoc = gcnew XmlDocument;
   
   // Load an XML file into the XmlDocument object.
   try
   {
      xmlDoc->PreserveWhitespace = true;
      xmlDoc->Load( L"test.xml" );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

   
   // Create a new TripleDES key. 
   TripleDESCryptoServiceProvider^ tDESkey = gcnew TripleDESCryptoServiceProvider;
   try
   {
      
      // Encrypt the "creditcard" element.
      Encrypt( xmlDoc, L"creditcard", tDESkey, L"tDesKey" );
      
      // Display the encrypted XML to the console.
      Console::WriteLine( L"Encrypted XML:" );
      Console::WriteLine();
      Console::WriteLine( xmlDoc->OuterXml );
      
      // Decrypt the "creditcard" element.
      Decrypt( xmlDoc, tDESkey, L"tDesKey" );
      
      // Display the encrypted XML to the console.
      Console::WriteLine();
      Console::WriteLine( L"Decrypted XML:" );
      Console::WriteLine();
      Console::WriteLine( xmlDoc->OuterXml );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }
   finally
   {
      
      // Clear the TripleDES key.
      tDESkey->Clear();
   }

}

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 TripleDES key.
        TripleDESCryptoServiceProvider tDESkey = new TripleDESCryptoServiceProvider();

        try
        {
            // Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", tDESkey, "tDesKey");

            // Display the encrypted XML to the console.
            Console.WriteLine("Encrypted XML:");
            Console.WriteLine();
            Console.WriteLine(xmlDoc.OuterXml);

            // Decrypt the "creditcard" element.
            Decrypt(xmlDoc, tDESkey, "tDesKey");

            // Display the encrypted XML to the console.
            Console.WriteLine();
            Console.WriteLine("Decrypted XML:");
            Console.WriteLine();
            Console.WriteLine(xmlDoc.OuterXml);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            // Clear the TripleDES key.
            tDESkey.Clear();
        }
    }

    public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, SymmetricAlgorithm 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
        // symmetric key.
        //////////////////////////////////////////////////

        EncryptedXml eXml = new EncryptedXml();

        // Add the key mapping.
        eXml.AddKeyNameMapping(KeyName, Alg);

        // Encrypt the element.
        EncryptedData edElement = eXml.Encrypt(elementToEncrypt, KeyName);

        ////////////////////////////////////////////////////
        // Replace the element from the original XmlDocument
        // object with the EncryptedData element.
        ////////////////////////////////////////////////////

        EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
    }

    public static void Decrypt(XmlDocument Doc, SymmetricAlgorithm 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 the key name mapping.
        exml.AddKeyNameMapping(KeyName, Alg);

        // Decrypt the XML document.
        exml.DecryptDocument();
    }
}

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 TripleDES key. 
        Dim tDESkey As New TripleDESCryptoServiceProvider()


        Try
            ' Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", tDESkey, "tDesKey")

            ' Display the encrypted XML to the console.
            Console.WriteLine("Encrypted XML:")
            Console.WriteLine()
            Console.WriteLine(xmlDoc.OuterXml)

            ' Decrypt the "creditcard" element.
            Decrypt(xmlDoc, tDESkey, "tDesKey")

            ' Display the encrypted XML to the console.
            Console.WriteLine()
            Console.WriteLine("Decrypted XML:")
            Console.WriteLine()
            Console.WriteLine(xmlDoc.OuterXml)
        Catch e As Exception
            Console.WriteLine(e.Message)
        Finally
            ' Clear the TripleDES key.
            tDESkey.Clear()
        End Try

    End Sub


    Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncrypt As String, ByVal Alg As SymmetricAlgorithm, ByVal KeyName As String)
        ' Check the arguments.  
        If Doc Is Nothing Then
            Throw New ArgumentNullException("Doc")
        End If
        If ElementToEncrypt 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 elementEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncrypt)(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 
        ' symmetric key.
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        Dim eXml As New EncryptedXml()

        ' Add the key mapping.
        eXml.AddKeyNameMapping(KeyName, Alg)

        ' Encrypt the element.
        Dim edElement As EncryptedData = eXml.Encrypt(elementEncrypt, KeyName)


        '''''''''''''''''''''''''''''''''''''''''''''''''''
        ' Replace the element from the original XmlDocument
        ' object with the EncryptedData element.
        '''''''''''''''''''''''''''''''''''''''''''''''''''
        EncryptedXml.ReplaceElement(elementEncrypt, edElement, False)

    End Sub


    Sub Decrypt(ByVal Doc As XmlDocument, ByVal Alg As SymmetricAlgorithm, 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 the key name mapping.
        exml.AddKeyNameMapping(KeyName, Alg)

        ' Decrypt the XML document.
        exml.DecryptDocument()

    End Sub
End Module

Hinweise

Diese Methode ist eine praktische Möglichkeit, die äußere XML eines Elements mithilfe eines Schlüsselnamens zu verschlüsseln. Wenn Sie mehr Kontrolle über die Verschlüsselung benötigen, damit Sie die verschlüsselten Informationen in einem <CipherReference> Element platzieren oder angeben können, ob das gesamte XML-Element oder nur dessen Inhalt verschlüsselt werden soll, verwenden Sie die EncryptData Methodenüberladungen.

Eine Liste aller unterstützten Algorithmen finden Sie in der Liste der konstanten Felder, die der EncryptedXml Klasse zugeordnet sind.