EncryptedXml.EncryptKey Methode
Definition
Wichtig
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Verschlüsselt den Schlüssel, mit dem ein Empfänger ein <EncryptedData>-Element entschlüsselt.
Überlädt
| EncryptKey(Byte[], SymmetricAlgorithm) |
Verschlüsselt einen Schlüssel mit einem symmetrischen Algorithmus, mit dem ein Empfänger ein |
| EncryptKey(Byte[], RSA, Boolean) |
Verschlüsselt den Schlüssel, mit dem ein Empfänger ein |
Beispiele
Im folgenden Codebeispiel wird veranschaulicht, wie ein XML-Dokument mithilfe eines asymmetrischen Schlüssels verschlüsselt wird. In diesem Beispiel wird ein symmetrischer Sitzungsschlüssel zum Verschlüsseln des Dokuments erstellt, und anschließend wird der asymmetrische Schlüssel verwendet, um eine verschlüsselte Version des Sitzungsschlüssels in das XML-Dokument einzubetten.
#using <System.Xml.dll>
#using <System.Security.dll>
#using <System.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, RSA^ 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
// a new random symmetric key.
//////////////////////////////////////////////////
// Create a 256 bit Aes key.
Aes^ sessionKey = Aes::Create();
sessionKey->KeySize = 256;
EncryptedXml^ eXml = gcnew EncryptedXml;
array<Byte>^encryptedElement = eXml->EncryptData( elementToEncrypt, sessionKey, false );
////////////////////////////////////////////////
// Construct an EncryptedData object and populate
// it with the desired encryption information.
////////////////////////////////////////////////
EncryptedData^ edElement = gcnew EncryptedData;
edElement->Type = EncryptedXml::XmlEncElementUrl;
// Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
edElement->EncryptionMethod = gcnew EncryptionMethod( EncryptedXml::XmlEncAES256Url );
// Encrypt the session key and add it to an EncryptedKey element.
EncryptedKey^ ek = gcnew EncryptedKey;
array<Byte>^encryptedKey = EncryptedXml::EncryptKey( sessionKey->Key, Alg, false );
ek->CipherData = gcnew CipherData( encryptedKey );
ek->EncryptionMethod = gcnew EncryptionMethod( EncryptedXml::XmlEncRSA15Url );
// Set the KeyInfo element to specify the
// name of the RSA key.
// Create a new KeyInfo element.
edElement->KeyInfo = gcnew KeyInfo;
// Create a new KeyInfoName element.
KeyInfoName^ kin = gcnew KeyInfoName;
// Specify a name for the key.
kin->Value = KeyName;
// Add the KeyInfoName element to the
// EncryptedKey object.
ek->KeyInfo->AddClause( kin );
// Add the encrypted key to the
// EncryptedData object.
edElement->KeyInfo->AddClause( gcnew 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 );
}
static void Decrypt( XmlDocument^ Doc, RSA^ 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 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();
}
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 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, L"creditcard", rsaKey, L"rsaKey" );
// Display the encrypted XML to the console.
Console::WriteLine( L"Encrypted XML:" );
Console::WriteLine();
Console::WriteLine( xmlDoc->OuterXml );
xmlDoc->Save( L"test.xml" );
// Decrypt the "creditcard" element.
Decrypt( xmlDoc, rsaKey, L"rsaKey" );
// Display the encrypted XML to the console.
Console::WriteLine();
Console::WriteLine( L"Decrypted XML:" );
Console::WriteLine();
Console::WriteLine( xmlDoc->OuterXml );
xmlDoc->Save( L"test.xml" );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
finally
{
// Clear the RSA key.
rsaKey->Clear();
}
return 1;
}
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);
return;
}
// 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", rsaKey, "rsaKey");
// Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:");
Console.WriteLine();
Console.WriteLine(xmlDoc.OuterXml);
xmlDoc.Save("test.xml");
// Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey");
xmlDoc.Save("test.xml");
// 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();
}
}
public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, RSA 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
// 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;
// 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);
// 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();
}
}
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)
Return
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 = RSA = RSA.Create()
Try
' Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", rsaKey, "rsaKey")
' Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:")
Console.WriteLine()
Console.WriteLine(xmlDoc.OuterXml)
xmlDoc.Save("test.xml")
' 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)
xmlDoc.Save("test.xml")
Catch e As Exception
Console.WriteLine(e.Message)
Finally
' Clear the RSA key.
rsaKey.Clear()
End Try
End Sub
Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncrypt 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 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
' 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(elementEncrypt, sessionKey, False)
'''''''''''''''''''''''''''''''''''''''''''''''''''
' Construct an EncryptedData object and populate
' it with the desired encryption information.
'''''''''''''''''''''''''''''''''''''''''''''''''''
Dim edElement As New EncryptedData()
edElement.Type = EncryptedXml.XmlEncElementUrl
' 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)
' 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(elementEncrypt, 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
Hinweise
Verwenden Sie die EncryptKey -Methode, um den Schlüssel zu verschlüsseln, den ein Empfänger zum Entschlüsseln eines <EncryptedData> Elements verwendet. Diese Methode platziert den verschlüsselten Schlüssel in einem <EncryptedKey> Element.
EncryptKey(Byte[], SymmetricAlgorithm)
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
Verschlüsselt einen Schlüssel mit einem symmetrischen Algorithmus, mit dem ein Empfänger ein <EncryptedData>-Element entschlüsselt.
public:
static cli::array <System::Byte> ^ EncryptKey(cli::array <System::Byte> ^ keyData, System::Security::Cryptography::SymmetricAlgorithm ^ symmetricAlgorithm);public static byte[] EncryptKey (byte[] keyData, System.Security.Cryptography.SymmetricAlgorithm symmetricAlgorithm);static member EncryptKey : byte[] * System.Security.Cryptography.SymmetricAlgorithm -> byte[]Public Shared Function EncryptKey (keyData As Byte(), symmetricAlgorithm As SymmetricAlgorithm) As Byte()Parameter
- keyData
- Byte[]
Der zu verschlüsselnde Schlüssel.
- symmetricAlgorithm
- SymmetricAlgorithm
Der symmetrische Schlüssel zum Verschlüsseln von keyData.
Gibt zurück
Byte[]
Ein Bytearray, das den verschlüsselten Wert des keyData-Parameters darstellt.
Ausnahmen
Der Wert des keyData-Parameters ist null.
- oder -
Der Wert des symmetricAlgorithm-Parameters ist null.
Der Wert des symmetricAlgorithm-Parameters entspricht nicht dem Triple DES Key Wrap-Algorithmus bzw. dem AES Key Wrap-Algorithmus (Advanced Encryption Standard) (auch als Rijndael bezeichnet).
Hinweise
Verwenden Sie die EncryptKey -Methode, um den Schlüssel zu verschlüsseln, den ein Empfänger zum Entschlüsseln eines <EncryptedData> Elements verwendet. Diese Methode akzeptiert einen Wert für den Parameter, der symmetricAlgorithm entweder den Triple DES-Algorithmus oder den AES-Schlüsselumbruchalgorithmus (auch Rijndael genannt) darstellt.
Beachten Sie, dass diese Methode den verschlüsselten Schlüssel nicht automatisch in einem Element platziert <EncryptedKey> . Sie müssen das <EncryptedKey> Element in Ihrem Dokument manuell erstellen.
Gilt für:
EncryptKey(Byte[], RSA, Boolean)
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
- Quelle:
- EncryptedXml.cs
Verschlüsselt den Schlüssel, mit dem ein Empfänger ein <EncryptedData>-Element entschlüsselt.
public:
static cli::array <System::Byte> ^ EncryptKey(cli::array <System::Byte> ^ keyData, System::Security::Cryptography::RSA ^ rsa, bool useOAEP);public static byte[] EncryptKey (byte[] keyData, System.Security.Cryptography.RSA rsa, bool useOAEP);static member EncryptKey : byte[] * System.Security.Cryptography.RSA * bool -> byte[]Public Shared Function EncryptKey (keyData As Byte(), rsa As RSA, useOAEP As Boolean) As Byte()Parameter
- keyData
- Byte[]
Der zu verschlüsselnde Schlüssel.
- rsa
- RSA
Der asymmetrische Schlüssel zum Verschlüsseln von keyData.
- useOAEP
- Boolean
Ein Wert, der angibt, ob OAEP (Optimal Asymmetric Encryption Padding) verwendet werden soll.
Gibt zurück
Byte[]
Ein Bytearray, das den verschlüsselten Wert des keyData-Parameters darstellt.
Ausnahmen
Der Wert des keyData-Parameters ist null.
- oder -
Der Wert des rsa-Parameters ist null.
Beispiele
Im folgenden Codebeispiel wird veranschaulicht, wie ein XML-Dokument mithilfe eines asymmetrischen Schlüssels verschlüsselt wird. In diesem Beispiel wird ein symmetrischer Sitzungsschlüssel zum Verschlüsseln des Dokuments erstellt, und anschließend wird der asymmetrische Schlüssel verwendet, um eine verschlüsselte Version des Sitzungsschlüssels in das XML-Dokument einzubetten.
#using <System.Xml.dll>
#using <System.Security.dll>
#using <System.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, RSA^ 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
// a new random symmetric key.
//////////////////////////////////////////////////
// Create a 256 bit Aes key.
Aes^ sessionKey = Aes::Create();
sessionKey->KeySize = 256;
EncryptedXml^ eXml = gcnew EncryptedXml;
array<Byte>^encryptedElement = eXml->EncryptData( elementToEncrypt, sessionKey, false );
////////////////////////////////////////////////
// Construct an EncryptedData object and populate
// it with the desired encryption information.
////////////////////////////////////////////////
EncryptedData^ edElement = gcnew EncryptedData;
edElement->Type = EncryptedXml::XmlEncElementUrl;
// Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
edElement->EncryptionMethod = gcnew EncryptionMethod( EncryptedXml::XmlEncAES256Url );
// Encrypt the session key and add it to an EncryptedKey element.
EncryptedKey^ ek = gcnew EncryptedKey;
array<Byte>^encryptedKey = EncryptedXml::EncryptKey( sessionKey->Key, Alg, false );
ek->CipherData = gcnew CipherData( encryptedKey );
ek->EncryptionMethod = gcnew EncryptionMethod( EncryptedXml::XmlEncRSA15Url );
// Set the KeyInfo element to specify the
// name of the RSA key.
// Create a new KeyInfo element.
edElement->KeyInfo = gcnew KeyInfo;
// Create a new KeyInfoName element.
KeyInfoName^ kin = gcnew KeyInfoName;
// Specify a name for the key.
kin->Value = KeyName;
// Add the KeyInfoName element to the
// EncryptedKey object.
ek->KeyInfo->AddClause( kin );
// Add the encrypted key to the
// EncryptedData object.
edElement->KeyInfo->AddClause( gcnew 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 );
}
static void Decrypt( XmlDocument^ Doc, RSA^ 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 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();
}
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 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, L"creditcard", rsaKey, L"rsaKey" );
// Display the encrypted XML to the console.
Console::WriteLine( L"Encrypted XML:" );
Console::WriteLine();
Console::WriteLine( xmlDoc->OuterXml );
xmlDoc->Save( L"test.xml" );
// Decrypt the "creditcard" element.
Decrypt( xmlDoc, rsaKey, L"rsaKey" );
// Display the encrypted XML to the console.
Console::WriteLine();
Console::WriteLine( L"Decrypted XML:" );
Console::WriteLine();
Console::WriteLine( xmlDoc->OuterXml );
xmlDoc->Save( L"test.xml" );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
finally
{
// Clear the RSA key.
rsaKey->Clear();
}
return 1;
}
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);
return;
}
// 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", rsaKey, "rsaKey");
// Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:");
Console.WriteLine();
Console.WriteLine(xmlDoc.OuterXml);
xmlDoc.Save("test.xml");
// Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey");
xmlDoc.Save("test.xml");
// 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();
}
}
public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, RSA 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
// 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;
// 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);
// 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();
}
}
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)
Return
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 = RSA = RSA.Create()
Try
' Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", rsaKey, "rsaKey")
' Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:")
Console.WriteLine()
Console.WriteLine(xmlDoc.OuterXml)
xmlDoc.Save("test.xml")
' 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)
xmlDoc.Save("test.xml")
Catch e As Exception
Console.WriteLine(e.Message)
Finally
' Clear the RSA key.
rsaKey.Clear()
End Try
End Sub
Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncrypt 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 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
' 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(elementEncrypt, sessionKey, False)
'''''''''''''''''''''''''''''''''''''''''''''''''''
' Construct an EncryptedData object and populate
' it with the desired encryption information.
'''''''''''''''''''''''''''''''''''''''''''''''''''
Dim edElement As New EncryptedData()
edElement.Type = EncryptedXml.XmlEncElementUrl
' 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)
' 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(elementEncrypt, 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
Hinweise
Verwenden Sie die EncryptKey -Methode, um den Schlüssel zu verschlüsseln, den ein Empfänger zum Entschlüsseln eines <EncryptedData> Elements verwendet. Diese Methode akzeptiert einen Wert für rsa , der entweder den RSA PKCS#1 v1.5-Algorithmus oder den RSA PKCS#1-Algorithmus vom Typ 2 (auch als OAEP bezeichnet) darstellt.
Beachten Sie, dass diese Methode den verschlüsselten Schlüssel nicht automatisch in einem Element platziert <EncryptedKey> . Sie müssen das <EncryptedKey> Element in Ihrem Dokument manuell erstellen.
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