KeyReference クラス
アセンブリ: System.Security (system.security.dll 内)


KeyReference クラスは、暗号化キーの場所に関する情報を含む <KeyReference> 要素を表します。
<KeyReference> 要素を使用して、<EncryptedKey> 要素を参照します。この要素の暗号化に使用されたキーは、外側の <EncryptedKey> 要素で定義されています。複数の <EncryptedKey> 要素が同じキーを使用して暗号化されている場合は、複数の <KeyReference> 要素を使用できます。
XPath 変換、圧縮解除変換、ドキュメント ストレージ機能から要素を取得する方法の情報など、暗号化アプリケーションに役立つ追加情報を含めることができます。
XML 暗号化標準の詳細については、http://www.w3.org/TR/xmlenc-core/ の W3C (World Wide Web Consortium) から提供されている XML 暗号化仕様を参照してください。

XML ドキュメントを暗号化する際に、KeyReference オブジェクトを使用する方法を次のコード例に示します。
Imports System 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 New RSACryptoServiceProvider 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 'Main 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 Rijndael key. Dim sessionKey As New RijndaelManaged() 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() ek.Id = "keyID" 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 KeyReference object. ' Use the uri of the encrypted key. Dim kryRef As New KeyReference("#keyID") ek.AddReference(kryRef) ' 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 'Encrypt 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 'Decrypt 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. ' ' <root> ' <creditcard xmlns="myNamespace" Id="tag1"> ' <number>19834209</number> ' <expiry>02/02/2002</expiry> ' </creditcard> ' <creditcard2 xmlns="myNamespace" Id="tag2"> ' <number>19834208</number> ' <expiry>02/02/2002</expiry> ' </creditcard2> ' </root>
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 = new RSACryptoServiceProvider(); 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 Rijndael key. RijndaelManaged sessionKey = new RijndaelManaged(); 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(); ek.Id = "keyID"; 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 KeyReference object. // Use the uri of the encrypted key. KeyReference kryRef = new KeyReference("#keyID"); ek.AddReference(kryRef); // 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. // // <root> // <creditcard xmlns="myNamespace" Id="tag1"> // <number>19834209</number> // <expiry>02/02/2002</expiry> // </creditcard> // <creditcard2 xmlns="myNamespace" Id="tag2"> // <number>19834208</number> // <expiry>02/02/2002</expiry> // </creditcard2> // </root>

System.Security.Cryptography.Xml.EncryptedReference
System.Security.Cryptography.Xml.KeyReference


Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


KeyReference コンストラクタ ()
アセンブリ: System.Security (system.security.dll 内)


このコンストラクタは、<KeyReference> 要素を表す KeyReference クラスの新しいインスタンスを作成します。<KeyReference> 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、http://www.w3.org/TR/xmlenc-core/ の W3C (World Wide Web Consortium) から提供されている XML 暗号化仕様を参照してください。

XML ドキュメントを暗号化する際に、KeyReference オブジェクトを使用する方法を次のコード例に示します。
Imports System 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 New RSACryptoServiceProvider 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 'Main 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 Rijndael key. Dim sessionKey As New RijndaelManaged() 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() ek.Id = "keyID" 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 KeyReference object. ' Use the uri of the encrypted key. Dim kryRef As New KeyReference("#keyID") ek.AddReference(kryRef) ' 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 'Encrypt 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 'Decrypt 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. ' ' <root> ' <creditcard xmlns="myNamespace" Id="tag1"> ' <number>19834209</number> ' <expiry>02/02/2002</expiry> ' </creditcard> ' <creditcard2 xmlns="myNamespace" Id="tag2"> ' <number>19834208</number> ' <expiry>02/02/2002</expiry> ' </creditcard2> ' </root>
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 = new RSACryptoServiceProvider(); 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 Rijndael key. RijndaelManaged sessionKey = new RijndaelManaged(); 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(); ek.Id = "keyID"; 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 KeyReference object. // Use the uri of the encrypted key. KeyReference kryRef = new KeyReference("#keyID"); ek.AddReference(kryRef); // 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. // // <root> // <creditcard xmlns="myNamespace" Id="tag1"> // <number>19834209</number> // <expiry>02/02/2002</expiry> // </creditcard> // <creditcard2 xmlns="myNamespace" Id="tag2"> // <number>19834208</number> // <expiry>02/02/2002</expiry> // </creditcard2> // </root>

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


KeyReference コンストラクタ (String, TransformChain)
アセンブリ: System.Security (system.security.dll 内)

Dim uri As String Dim transformChain As TransformChain Dim instance As New KeyReference(uri, transformChain)

このコンストラクタは、指定した URI (Uniform Resource Identifier) および変換チェーンを使用して、<KeyReference> 要素を表す KeyReference クラスの新しいインスタンスを作成します。URI は、暗号化キーおよび変換チェーン (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の暗号化されたデータの取得方法の情報を格納できる) の場所を示します。<KeyReference> 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、http://www.w3.org/TR/xmlenc-core/ の W3C (World Wide Web Consortium) から提供されている XML 暗号化仕様を参照してください。

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


KeyReference コンストラクタ (String)
アセンブリ: System.Security (system.security.dll 内)


このコンストラクタは、指定した URI を使用して、<KeyReference> 要素を表す KeyReference クラスの新しいインスタンスを作成します。URI は、暗号化キーの場所を示します。<KeyReference> 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、http://www.w3.org/TR/xmlenc-core/ の W3C (World Wide Web Consortium) から提供されている XML 暗号化仕様を参照してください。

XML ドキュメントを暗号化する際に、KeyReference オブジェクトを使用する方法を次のコード例に示します。
Imports System 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 New RSACryptoServiceProvider 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 'Main 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 Rijndael key. Dim sessionKey As New RijndaelManaged() 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() ek.Id = "keyID" 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 KeyReference object. ' Use the uri of the encrypted key. Dim kryRef As New KeyReference("#keyID") ek.AddReference(kryRef) ' 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 'Encrypt 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 'Decrypt 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. ' ' <root> ' <creditcard xmlns="myNamespace" Id="tag1"> ' <number>19834209</number> ' <expiry>02/02/2002</expiry> ' </creditcard> ' <creditcard2 xmlns="myNamespace" Id="tag2"> ' <number>19834208</number> ' <expiry>02/02/2002</expiry> ' </creditcard2> ' </root>
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 = new RSACryptoServiceProvider(); 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 Rijndael key. RijndaelManaged sessionKey = new RijndaelManaged(); 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(); ek.Id = "keyID"; 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 KeyReference object. // Use the uri of the encrypted key. KeyReference kryRef = new KeyReference("#keyID"); ek.AddReference(kryRef); // 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. // // <root> // <creditcard xmlns="myNamespace" Id="tag1"> // <number>19834209</number> // <expiry>02/02/2002</expiry> // </creditcard> // <creditcard2 xmlns="myNamespace" Id="tag2"> // <number>19834208</number> // <expiry>02/02/2002</expiry> // </creditcard2> // </root>

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


KeyReference コンストラクタ

名前 | 説明 |
---|---|
KeyReference () | XML 暗号化の KeyReference クラスの新しいインスタンスを初期化します。 |
KeyReference (String) | 指定した URI (Uniform Resource Identifier) を使用して、XML 暗号化の KeyReference クラスの新しいインスタンスを初期化します。 |
KeyReference (String, TransformChain) | 指定した URI (Uniform Resource Identifier) および TransformChain オブジェクトを使用して、XML 暗号化の KeyReference クラスの新しいインスタンスを作成します。 |

KeyReference プロパティ

名前 | 説明 | |
---|---|---|
![]() | TransformChain | EncryptedReference オブジェクトの変換チェーンを取得または設定します。 ( EncryptedReference から継承されます。) |
![]() | Uri | EncryptedReference オブジェクトの URI (Uniform Resource Identifier) を取得または設定します。 ( EncryptedReference から継承されます。) |

KeyReference メソッド

名前 | 説明 | |
---|---|---|
![]() | AddTransform | EncryptedReference オブジェクトの現在の変換チェーンに Transform オブジェクトを追加します。 ( EncryptedReference から継承されます。) |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 ( Object から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 ( Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 ( Object から継承されます。) |
![]() | GetXml | EncryptedReference オブジェクトの XML 表現を返します。 ( EncryptedReference から継承されます。) |
![]() | LoadXml | XML 要素を EncryptedReference オブジェクトに読み込みます。 ( EncryptedReference から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 ( Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 ( Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 ( Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 ( Object から継承されます。) |

KeyReference メンバ
XML 暗号化に使用する <KeyReference> 要素を表します。このクラスは継承できません。
KeyReference データ型で公開されるメンバを以下の表に示します。


名前 | 説明 | |
---|---|---|
![]() | TransformChain | EncryptedReference オブジェクトの変換チェーンを取得または設定します。(EncryptedReference から継承されます。) |
![]() | Uri | EncryptedReference オブジェクトの URI (Uniform Resource Identifier) を取得または設定します。(EncryptedReference から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | AddTransform | EncryptedReference オブジェクトの現在の変換チェーンに Transform オブジェクトを追加します。 (EncryptedReference から継承されます。) |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 (Object から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 (Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 (Object から継承されます。) |
![]() | GetXml | EncryptedReference オブジェクトの XML 表現を返します。 (EncryptedReference から継承されます。) |
![]() | LoadXml | XML 要素を EncryptedReference オブジェクトに読み込みます。 (EncryptedReference から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 (Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 (Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 (Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 (Object から継承されます。) |

Weblioに収録されているすべての辞書からKeyReferenceを検索する場合は、下記のリンクをクリックしてください。

- KeyReferenceのページへのリンク