DataReference コンストラクター

定義

名前空間:

System.Security.Cryptography.Xml

アセンブリ:

System.Security.Cryptography.Xml.dll

パッケージ:

System.Security.Cryptography.Xml v8.0.0

DataReference クラスの新しいインスタンスを初期化します。

オーバーロード

DataReference()	DataReference クラスの新しいインスタンスを初期化します。
DataReference(String)	指定した URI (Uniform Resource Identifier) を使用して、DataReference クラスの新しいインスタンスを初期化します。
DataReference(String, TransformChain)	指定した URI (Uniform Resource Identifier) および DataReference オブジェクトを使用して、TransformChain クラスの新しいインスタンスを初期化します。

DataReference()

ソース:

DataReference.cs

DataReference クラスの新しいインスタンスを初期化します。

public:
 DataReference();

public DataReference ();

Public Sub New ()

例

次のコード例では、 クラスを使用して、異なるセッション キーを DataReference 使用して複数の XML 要素を暗号化および復号化する方法を示します。

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 RSA key.  This key will encrypt a symmetric key,
        // which will then be imbedded in the XML document.
        RSA rsaKey = RSA.Create();

        try
        {
            // Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", "EncryptedElement1", rsaKey, "rsaKey");

            // Encrypt the "creditcard2" element.
            Encrypt(xmlDoc, "creditcard2", "EncryptedElement2", rsaKey, "rsaKey");

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

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

            // 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 RSA key.
            rsaKey.Clear();
        }

        Console.ReadLine();
    }

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

        ////////////////////////////////////////////////
        // 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
        // a new random symmetric key.
        //////////////////////////////////////////////////

        // Create a 256 bit Aes key.
        Aes sessionKey = Aes.Create();
        sessionKey.KeySize = 256;

        EncryptedXml eXml = new EncryptedXml();

        byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false);

        ////////////////////////////////////////////////
        // Construct an EncryptedData object and populate
        // it with the desired encryption information.
        ////////////////////////////////////////////////

        EncryptedData edElement = new EncryptedData();
        edElement.Type = EncryptedXml.XmlEncElementUrl;
        edElement.Id = EncryptionElementID;

        // Create an EncryptionMethod element so that the
        // receiver knows which algorithm to use for decryption.

        edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url);

        // Encrypt the session key and add it to an EncryptedKey element.
        EncryptedKey ek = new EncryptedKey();

        byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, Alg, false);

        ek.CipherData = new CipherData(encryptedKey);

        ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url);

        // Set the KeyInfo element to specify the
        // name of the RSA key.

        // Create a new KeyInfo element.
        edElement.KeyInfo = new KeyInfo();

        // Create a new KeyInfoName element.
        KeyInfoName kin = new KeyInfoName();

        // Specify a name for the key.
        kin.Value = KeyName;

        // Add the KeyInfoName element to the
        // EncryptedKey object.
        ek.KeyInfo.AddClause(kin);

        // Create a new DataReference element
        // for the KeyInfo element.  This optional
        // element specifies which EncryptedData
        // uses this key.  An XML document can have
        // multiple EncryptedData elements that use
        // different keys.
        DataReference dRef = new DataReference();

        // Specify the EncryptedData URI.
        dRef.Uri = "#" + EncryptionElementID;

        // Add the DataReference to the EncryptedKey.
        ek.AddReference(dRef);

        // Add the encrypted key to the
        // EncryptedData object.

        edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek));

        // Add the encrypted element data to the
        // EncryptedData object.
        edElement.CipherData.CipherValue = encryptedElement;

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

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

    public static void Decrypt(XmlDocument Doc, RSA 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 a key-name mapping.
        // This method can only decrypt documents
        // that present the specified key name.
        exml.AddKeyNameMapping(KeyName, Alg);

        // Decrypt the element.
        exml.DecryptDocument();
    }
}

// To run this sample, place the following XML
// in a file called test.xml.  Put test.xml
// in the same directory as your compiled program.
//
//     <creditcard xmlns="myNamespace" Id="tag1">
//         <number>19834209</number>
//         <expiry>02/02/2002</expiry>
//     <creditcard2 xmlns="myNamespace" Id="tag2">
//         <number>19834208</number>
//         <expiry>02/02/2002</expiry>

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 RSA key.  This key will encrypt a symmetric key,
        ' which will then be imbedded in the XML document.  
        Dim rsaKey As RSA = RSA.Create()


        Try
            ' Encrypt the "creditcard" element.
            Encrypt(xmlDoc, "creditcard", "EncryptedElement1", rsaKey, "rsaKey")

            ' Encrypt the "creditcard2" element.
            Encrypt(xmlDoc, "creditcard2", "EncryptedElement2", rsaKey, "rsaKey")

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

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

            ' 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 RSA key.
            rsaKey.Clear()
        End Try

        Console.ReadLine()

    End Sub

End Module 'Program


Module XMLEncryptionSubs

    Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncryptName As String, ByVal EncryptionElementID As String, ByVal Alg As RSA, ByVal KeyName As String)
        ' Check the arguments.  
        If Doc Is Nothing Then
            Throw New ArgumentNullException("Doc")
        End If
        If ElementToEncryptName Is Nothing Then
            Throw New ArgumentNullException("ElementToEncrypt")
        End If
        If EncryptionElementID Is Nothing Then
            Throw New ArgumentNullException("EncryptionElementID")
        End If
        If Alg Is Nothing Then
            Throw New ArgumentNullException("Alg")
        End If
        If KeyName Is Nothing Then
            Throw New ArgumentNullException("KeyName")
        End If
        ''''''''''''''''''''''''''''''''''''''''''''''''
        ' Find the specified element in the XmlDocument
        ' object and create a new XmlElemnt object.
        ''''''''''''''''''''''''''''''''''''''''''''''''

        Dim elementToEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncryptName)(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 
        ' a new random symmetric key.
        ''''''''''''''''''''''''''''''''''''''''''''''''

        ' Create a 256 bit Aes key.
        Dim sessionKey As Aes = Aes.Create()
        sessionKey.KeySize = 256

        Dim eXml As New EncryptedXml()

        Dim encryptedElement As Byte() = eXml.EncryptData(elementToEncrypt, sessionKey, False)

        ''''''''''''''''''''''''''''''''''''''''''''''''
        ' Construct an EncryptedData object and populate
        ' it with the desired encryption information.
        ''''''''''''''''''''''''''''''''''''''''''''''''

        Dim edElement As New EncryptedData()
        edElement.Type = EncryptedXml.XmlEncElementUrl
        edElement.Id = EncryptionElementID

        ' Create an EncryptionMethod element so that the 
        ' receiver knows which algorithm to use for decryption.
        edElement.EncryptionMethod = New EncryptionMethod(EncryptedXml.XmlEncAES256Url)

        ' Encrypt the session key and add it to an EncryptedKey element.
        Dim ek As New EncryptedKey()

        Dim encryptedKey As Byte() = EncryptedXml.EncryptKey(sessionKey.Key, Alg, False)

        ek.CipherData = New CipherData(encryptedKey)

        ek.EncryptionMethod = New EncryptionMethod(EncryptedXml.XmlEncRSA15Url)

        ' Set the KeyInfo element to specify the
        ' name of the RSA key.
        ' Create a new KeyInfo element.
        edElement.KeyInfo = New KeyInfo()

        ' Create a new KeyInfoName element.
        Dim kin As New KeyInfoName()

        ' Specify a name for the key.
        kin.Value = KeyName

        ' Add the KeyInfoName element to the 
        ' EncryptedKey object.
        ek.KeyInfo.AddClause(kin)

        ' Create a new DataReference element
        ' for the KeyInfo element.  This optional
        ' element specifies which EncryptedData 
        ' uses this key.  An XML document can have
        ' multiple EncryptedData elements that use
        ' different keys.
        Dim dRef As New DataReference()

        ' Specify the EncryptedData URI. 
        dRef.Uri = "#" + EncryptionElementID

        ' Add the DataReference to the EncryptedKey.
        ek.AddReference(dRef)

        ' Add the encrypted key to the 
        ' EncryptedData object.
        edElement.KeyInfo.AddClause(New KeyInfoEncryptedKey(ek))

        ' Add the encrypted element data to the 
        ' EncryptedData object.
        edElement.CipherData.CipherValue = encryptedElement

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

    End Sub


    Sub Decrypt(ByVal Doc As XmlDocument, ByVal Alg As RSA, 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 a key-name mapping.
        ' This method can only decrypt documents
        ' that present the specified key name.
        exml.AddKeyNameMapping(KeyName, Alg)

        ' Decrypt the element.
        exml.DecryptDocument()

    End Sub
End Module 'XMLEncryptionSubs


' To run this sample, place the following XML
' in a file called test.xml.  Put test.xml
' in the same directory as your compiled program.
' 
'     <creditcard xmlns="myNamespace" Id="tag1">
'         <number>19834209</number>
'         <expiry>02/02/2002</expiry>
'     <creditcard2 xmlns="myNamespace" Id="tag2">
'         <number>19834208</number>
'         <expiry>02/02/2002</expiry>

注釈

このコンストラクターは、 要素を表す クラスの DataReference 新しいインスタンスを <DataReference> 作成します。 <DataReference> は、 要素の <ReferenceList> 子要素です。

XML 暗号化標準の詳細については、「 XML 暗号化の構文と処理バージョン」を参照してください。

DataReference(String)

ソース:

DataReference.cs

指定した URI (Uniform Resource Identifier) を使用して、DataReference クラスの新しいインスタンスを初期化します。

public:
 DataReference(System::String ^ uri);

public DataReference (string uri);

new System.Security.Cryptography.Xml.DataReference : string -> System.Security.Cryptography.Xml.DataReference

Public Sub New (uri As String)

パラメーター

uri

String

暗号化されたデータを指す URI (Uniform Resource Identifier)。

注釈

このコンストラクターは、指定された Uniform Resource Identifier (URI) を使用して、 要素を表す クラスの DataReference 新しいインスタンスを <DataReference> 作成します。 URI は、暗号化されたデータの場所を示します。 <DataReference> 要素は、<ReferenceList> 要素の子要素です。

XML 暗号化標準の詳細については、「 XML 暗号化の構文と処理バージョン」を参照してください。

DataReference(String, TransformChain)

ソース:

DataReference.cs

指定した URI (Uniform Resource Identifier) および DataReference オブジェクトを使用して、TransformChain クラスの新しいインスタンスを初期化します。

public:
 DataReference(System::String ^ uri, System::Security::Cryptography::Xml::TransformChain ^ transformChain);

public DataReference (string uri, System.Security.Cryptography.Xml.TransformChain transformChain);

new System.Security.Cryptography.Xml.DataReference : string * System.Security.Cryptography.Xml.TransformChain -> System.Security.Cryptography.Xml.DataReference

Public Sub New (uri As String, transformChain As TransformChain)

パラメーター

uri

String

暗号化されたデータを指す URI (Uniform Resource Identifier)。

transformChain

TransformChain

暗号化されたデータに対して適用する変換を記述する TransformChain オブジェクト。

注釈

このコンストラクターは、指定された Uniform Resource Identifier (URI) と変換チェーンを使用して、 要素を表す クラスの DataReference 新しいインスタンスを <DataReference> 作成します。 URI は暗号化されたデータの場所を示し、変換チェーンには XPath 変換、圧縮解除変換、またはドキュメント ストレージ機能から暗号化されたデータを取得する方法に関する情報を含めることができます。 <DataReference> は、 要素の <ReferenceList> 子要素です。

XML 暗号化標準の詳細については、「 XML 暗号化の構文と処理バージョン」を参照してください。