XmlLicenseTransform Classe

Définition

public ref class XmlLicenseTransform : System::Security::Cryptography::Xml::Transform

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("XmlDsigXsltTransform uses XslCompiledTransform which requires dynamic code.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The algorithm implementations referenced in the XML payload might be removed. Ensure the required algorithm implementations are preserved in your application.")]
public class XmlLicenseTransform : System.Security.Cryptography.Xml.Transform

public class XmlLicenseTransform : System.Security.Cryptography.Xml.Transform

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("XmlDsigXsltTransform uses XslCompiledTransform which requires dynamic code.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("The algorithm implementations referenced in the XML payload might be removed. Ensure the required algorithm implementations are preserved in your application.")>]
type XmlLicenseTransform = class
    inherit Transform

type XmlLicenseTransform = class
    inherit Transform

Public Class XmlLicenseTransform
Inherits Transform

Héritage

Object

Transform

XmlLicenseTransform

Attributs

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

Exemples

L’exemple de code suivant montre comment valider une signature numérique XML à l’aide de l’interface IRelDecryptor et de la XmlLicenseTransform classe.

public static void CheckSignatureWithEncryptedGrant(string fileName, IRelDecryptor decryptor)
{
    // Create a new XML document.
    XmlDocument xmlDocument = new XmlDocument();
    XmlNamespaceManager nsManager = new XmlNamespaceManager(xmlDocument.NameTable);

    // Format using white spaces.
    xmlDocument.PreserveWhitespace = true;

    // Load the passed XML file into the document.
    xmlDocument.Load(fileName);
    nsManager.AddNamespace("dsig", SignedXml.XmlDsigNamespaceUrl);

    // Find the "Signature" node and create a new XmlNodeList object.
    XmlNodeList nodeList = xmlDocument.SelectNodes("//dsig:Signature", nsManager);

    for (int i = 0, count = nodeList.Count; i < count; i++)
    {
        XmlDocument clone = xmlDocument.Clone() as XmlDocument;
        XmlNodeList signatures = clone.SelectNodes("//dsig:Signature", nsManager);

        // Create a new SignedXml object and pass into it the XML document clone.
        SignedXml signedXml = new SignedXml(clone);

        // Load the signature node.
        signedXml.LoadXml((XmlElement)signatures[i]);

        // Set the context for license transform
        Transform trans = ((Reference)signedXml.SignedInfo.References[0]).TransformChain[0];

        if (trans is XmlLicenseTransform)
        {

            // Decryptor is used to decrypt encryptedGrant elements.
            if (decryptor != null)
                (trans as XmlLicenseTransform).Decryptor = decryptor;
        }

        // Check the signature and display the result.
        bool result = signedXml.CheckSignature();

        if (result)
            Console.WriteLine("SUCCESS: CheckSignatureWithEncryptedGrant - issuer index #" +
                                            i.ToString());
        else
            Console.WriteLine("FAILURE: CheckSignatureWithEncryptedGrant - issuer index #" +
                                            i.ToString());
    }
}

    Public Shared Sub CheckSignatureWithEncryptedGrant(ByVal fileName As String, ByVal decryptor As IRelDecryptor)
        ' Create a new XML document.
        Dim xmlDocument As New XmlDocument()
        Dim nsManager As New XmlNamespaceManager(xmlDocument.NameTable)

        ' Format using white spaces.
        xmlDocument.PreserveWhitespace = True

        ' Load the passed XML file into the document. 
        xmlDocument.Load(fileName)
        nsManager.AddNamespace("dsig", SignedXml.XmlDsigNamespaceUrl)

        ' Find the "Signature" node and create a new XmlNodeList object.
        Dim nodeList As XmlNodeList = xmlDocument.SelectNodes("//dsig:Signature", nsManager)

        Dim count = nodeList.Count

        For i As Integer = 0 To count - 1
            Dim clone As XmlDocument = xmlDocument.Clone()
           
            Dim signatures As XmlNodeList = clone.SelectNodes("//dsig:Signature", nsManager)

            ' Create a new SignedXml object and pass into it the XML document clone.
            Dim signedXml As New SignedXml(clone)

            ' Load the signature node.
            signedXml.LoadXml(CType(signatures(i), XmlElement))

            ' Set the context for license transform
            Dim trans As Transform = CType(signedXml.SignedInfo.References(0), Reference).TransformChain(0)

            If TypeOf trans Is XmlLicenseTransform Then

                ' Decryptor is used to decrypt encryptedGrant elements.
                If Not (decryptor Is Nothing) Then
                    CType(trans, XmlLicenseTransform).Decryptor = decryptor
                End If

            End If

            ' Check the signature and display the result.
            Dim result As Boolean = signedXml.CheckSignature()

            If result Then
                Console.WriteLine("SUCCESS: CheckSignatureWithEncryptedGrant - issuer index #" + i.ToString())
            Else
                Console.WriteLine("FAILURE: CheckSignatureWithEncryptedGrant - issuer index #" + i.ToString())
            End If
        Next i

    End Sub
End Class

Remarques

La XmlLicenseTransform classe représente l’algorithme de transformation de licence tel que défini dans le langage MPEG Rights Extension Language (MPEG REL).

Utilisez la XmlLicenseTransform classe pour transformer des licences XrML pour les signatures.

L’URI (Uniform Resource Identifier) qui décrit la XmlLicenseTransform classe est définie par le XmlLicenseTransformUrl champ.