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IRelDecryptor Interface

Defines methods that decrypt an XrML <encryptedGrant> element.

Namespace:  System.Security.Cryptography.Xml
Assembly:  System.Security (in System.Security.dll)

'Declaration
Public Interface IRelDecryptor
'Usage
Dim instance As IRelDecryptor

Use the IRelDecryptor interface with the XmlLicenseTransform class to decrypt an XrML <encryptedGrant> element.

The following code example shows how to validate an XML digital signature using the IRelDecryptor interface and the XmlLicenseTransform class.

    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 whitespaces.
        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
        Dim i As Integer 

        For i = 0 To count
            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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0
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