EncryptedKey Classe
Definizione
Importante
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Rappresenta l'elemento <EncryptedKey> nella crittografia XML. La classe non può essere ereditata.
public ref class EncryptedKey sealed : System::Security::Cryptography::Xml::EncryptedTypepublic sealed class EncryptedKey : System.Security.Cryptography.Xml.EncryptedTypetype EncryptedKey = class
inherit EncryptedTypePublic NotInheritable Class EncryptedKey
Inherits EncryptedType- Ereditarietà
Esempio
Nell'esempio seguente viene illustrato come crittografare e decrittografare un elemento XML usando la EncryptedKey classe . In questo esempio vengono quindi visualizzati i valori di varie proprietà della EncryptedKey classe nella console.
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", rsaKey, "rsaKey");
// Inspect the EncryptedKey element.
InspectElement(xmlDoc);
// Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey");
}
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();
}
static void InspectElement(XmlDocument Doc)
{
// Get the EncryptedKey element from the XMLDocument object.
XmlElement encryptedKey = Doc.GetElementsByTagName("EncryptedKey")[0] as XmlElement;
// Create a new EncryptedKey object.
EncryptedKey k = new EncryptedKey();
// Load the XML from the document to
// initialize the EncryptedKey object.
k.LoadXml(encryptedKey);
// Display the properties.
// Most values are Null by default.
Console.WriteLine("EncryptedKey.KeyInfo: " + k.KeyInfo.GetXml().InnerXml);
Console.WriteLine("EncryptedKey.Id: " + k.Id);
Console.WriteLine("EncryptedKey.CarriedKeyName: " + k.CarriedKeyName);
Console.WriteLine("EncryptedKey.CipherData: " + k.CipherData.GetXml().InnerXml);
Console.WriteLine("EncryptedKey.Encoding: " + k.Encoding);
Console.WriteLine("EncryptedKey.EncryptionMethod: " + k.EncryptionMethod.GetXml().InnerXml);
if (k.EncryptionProperties.Count >= 1)
{
Console.WriteLine("EncryptedKey.EncryptionProperties: " + k.EncryptionProperties[0].GetXml().InnerXml);
}
Console.WriteLine("EncryptedKey.MimeType: " + k.MimeType);
Console.WriteLine("EncryptedKey.Recipient: " + k.Recipient);
if (k.ReferenceList.Count >= 1)
{
Console.WriteLine("EncryptedKey.ReferenceList: " + k.ReferenceList[0].GetXml().InnerXml);
}
}
}
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", rsaKey, "rsaKey")
' Inspect the EncryptedKey element.
InspectElement(xmlDoc)
' Decrypt the "creditcard" element.
Decrypt(xmlDoc, rsaKey, "rsaKey")
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 ElementToEncryptParam 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 ElementToEncryptParam 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 elementToEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncryptParam)(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
' 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(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
Sub InspectElement(ByVal Doc As XmlDocument)
' Get the EncryptedKey element from the XMLDocument object.
Dim encryptedKey As XmlElement = Doc.GetElementsByTagName("EncryptedKey")(0)
' Create a new EncryptedKey object.
Dim k As New EncryptedKey()
' Load the XML from the document to
' initialize the EncryptedKey object.
k.LoadXml(encryptedKey)
' Display the properties.
' Most values are Null by default.
Console.WriteLine("EncryptedKey.KeyInfo: " + k.KeyInfo.GetXml().InnerXml)
Console.WriteLine("EncryptedKey.Id: " + k.Id)
Console.WriteLine("EncryptedKey.CarriedKeyName: " + k.CarriedKeyName)
Console.WriteLine("EncryptedKey.CipherData: " + k.CipherData.GetXml().InnerXml)
Console.WriteLine("EncryptedKey.Encoding: " + k.Encoding)
Console.WriteLine("EncryptedKey.EncryptionMethod: " + k.EncryptionMethod.GetXml().InnerXml)
If k.EncryptionProperties.Count >= 1 Then
Console.WriteLine("EncryptedKey.EncryptionProperties: " + k.EncryptionProperties(0).GetXml().InnerXml)
End If
Console.WriteLine("EncryptedKey.MimeType: " + k.MimeType)
Console.WriteLine("EncryptedKey.Recipient: " + k.Recipient)
If k.ReferenceList.Count >= 1 Then
Console.WriteLine("EncryptedKey.ReferenceList: " + k.ReferenceList(0).GetXml().InnerXml)
End If
End Sub
End Module
Commenti
Questa classe rappresenta l'elemento <EncryptedKey> nella crittografia XML. L'elemento <EncryptedKey> viene usato per inviare chiavi di crittografia. Può essere creato in un documento XML autonomo, essere inserito all'interno di un documento dell'applicazione o essere all'interno di un <EncryptedData> elemento come elemento figlio di un <KeyInfo> elemento. Il valore della chiave viene sempre crittografato al destinatario. Quando <EncryptedKey> viene decrittografata, la chiave risultante viene resa disponibile per l'algoritmo <EncryptionMethod> senza alcuna elaborazione aggiuntiva.
L'elemento <EncryptedKey> è simile all'elemento <EncryptedData> della classe, ad eccezione del EncryptedData fatto che i dati crittografati sono sempre un valore chiave.
Costruttori
| EncryptedKey() |
Inizializza una nuova istanza della classe EncryptedKey. |
Proprietà
| CarriedKeyName |
Ottiene o imposta l'elemento |
| CipherData |
Ottiene o imposta il valore CipherData di un'istanza della classe EncryptedType. (Ereditato da EncryptedType) |
| Encoding |
Ottiene o imposta l'attributo |
| EncryptionMethod |
Ottiene o imposta l'elemento |
| EncryptionProperties |
Ottiene o imposta l'elemento |
| Id |
Ottiene o imposta l'attributo |
| KeyInfo |
Ottiene o imposta l'elemento |
| MimeType |
Ottiene o imposta l'attributo |
| Recipient |
Ottiene o imposta l'attributo |
| ReferenceList |
Ottiene o imposta l'elemento |
| Type |
Ottiene o imposta l'attributo |
Metodi
| AddProperty(EncryptionProperty) |
Aggiunge un elemento figlio |
| AddReference(DataReference) |
Aggiunge un elemento |
| AddReference(KeyReference) |
Aggiunge un elemento |
| Equals(Object) |
Determina se l'oggetto specificato è uguale all'oggetto corrente. (Ereditato da Object) |
| GetHashCode() |
Funge da funzione hash predefinita. (Ereditato da Object) |
| GetType() |
Ottiene l'oggetto Type dell'istanza corrente. (Ereditato da Object) |
| GetXml() |
Restituisce la rappresentazione XML dell'oggetto EncryptedKey. |
| LoadXml(XmlElement) |
Carica le informazioni XML nell'elemento |
| MemberwiseClone() |
Crea una copia superficiale dell'oggetto Object corrente. (Ereditato da Object) |
| ToString() |
Restituisce una stringa che rappresenta l'oggetto corrente. (Ereditato da Object) |
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