EncryptedType.Type Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan atau mengatur atribut Type instans EncryptedType dalam enkripsi XML.
public:
virtual property System::String ^ Type { System::String ^ get(); void set(System::String ^ value); };public virtual string? Type { get; set; }public virtual string Type { get; set; }member this.Type : string with get, setPublic Overridable Property Type As StringNilai Properti
String yang menjelaskan bentuk teks data terenkripsi.
Contoh
Contoh kode berikut menunjukkan cara mengenkripsi dan mendekripsi elemen XML menggunakan EncryptedData kelas yang berasal dari EncryptedType kelas .
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 TripleDES key.
TripleDESCryptoServiceProvider tDESkey = new TripleDESCryptoServiceProvider();
try
{
// Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", tDESkey);
// Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:");
Console.WriteLine();
Console.WriteLine(xmlDoc.OuterXml);
// Decrypt the "creditcard" element.
Decrypt(xmlDoc, tDESkey);
// 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 TripleDES key.
tDESkey.Clear();
}
}
public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, TripleDESCryptoServiceProvider 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
// symmetric key.
//////////////////////////////////////////////////
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Alg, 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.
// Determine what kind of algorithm is being used and
// supply the appropriate URL to the EncryptionMethod element.
edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncTripleDESUrl);
// 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, SymmetricAlgorithm Alg)
{
// Find the EncryptedData element in the XmlDocument.
XmlElement encryptedElement = Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement;
// If the EncryptedData element was not found, throw an exception.
if (encryptedElement == null)
{
throw new XmlException("The EncryptedData element was not found.");
}
// Create an EncryptedData object and populate it.
EncryptedData edElement = new EncryptedData();
edElement.LoadXml(encryptedElement);
// Create a new EncryptedXml object.
EncryptedXml exml = new EncryptedXml();
// Decrypt the element using the symmetric key.
byte[] rgbOutput = exml.DecryptData(edElement, Alg);
// Replace the encryptedData element with the plaintext XML element.
exml.ReplaceData(encryptedElement, rgbOutput);
}
}
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 TripleDES key.
Dim tDESkey As New TripleDESCryptoServiceProvider()
Try
' Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", tDESkey)
' Display the encrypted XML to the console.
Console.WriteLine("Encrypted XML:")
Console.WriteLine()
Console.WriteLine(xmlDoc.OuterXml)
' Decrypt the "creditcard" element.
Decrypt(xmlDoc, tDESkey)
' 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 TripleDES key.
tDESkey.Clear()
End Try
End Sub
Sub Encrypt(ByVal Doc As XmlDocument, ByVal ElementToEncryptString As String, ByVal Alg As TripleDESCryptoServiceProvider)
''''''''''''''''''''''''''''''''''''''''''''''''''
' Find the specified element in the XmlDocument
' object and create a new XmlElemnt object.
''''''''''''''''''''''''''''''''''''''''''''''''''
Dim elementToEncrypt As XmlElement = Doc.GetElementsByTagName(ElementToEncryptString)(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
' symmetric key.
''''''''''''''''''''''''''''''''''''''''''''''''''
Dim eXml As New EncryptedXml()
Dim encryptedElement As Byte() = eXml.EncryptData(elementToEncrypt, Alg, 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.
' Determine what kind of algorithm is being used and
' supply the appropriate URL to the EncryptionMethod element.
edElement.EncryptionMethod = New EncryptionMethod(EncryptedXml.XmlEncTripleDESUrl)
' 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 SymmetricAlgorithm)
' Find the EncryptedData element in the XmlDocument.
Dim encryptedElement As XmlElement = Doc.GetElementsByTagName("EncryptedData")(0)
' If the EncryptedData element was not found, throw an exception.
If encryptedElement Is Nothing Then
Throw New XmlException("The EncryptedData element was not found.")
End If
' Create an EncryptedData object and populate it.
Dim edElement As New EncryptedData()
edElement.LoadXml(encryptedElement)
' Create a new EncryptedXml object.
Dim exml As New EncryptedXml()
' Decrypt the element using the symmetric key.
Dim rgbOutput As Byte() = exml.DecryptData(edElement, Alg)
' Replace the encryptedData element with the plaintext XML element.
exml.ReplaceData(encryptedElement, rgbOutput)
End Sub
End Module
Keterangan
Atribut Type adalah atribut opsional yang mengidentifikasi informasi jenis tentang bentuk teks konten terenkripsi. Meskipun opsional, ini adalah atribut penting dan digunakan dalam pemrosesan wajib yang dijelaskan dalam Aturan Pemrosesan: Dekripsi (bagian 4.2) dari spesifikasi Sintaks dan Pemrosesan Enkripsi XML (https://www.w3.org/TR/xmlenc-core/). Jika elemen berisi data jenis <EncryptedData> atau elemen 'element', dan mengganti data tersebut 'content' dalam dokumen XML, sangat disarankan agar Type atribut disediakan. Tanpa informasi ini, aplikasi yang mencoba mendekripsi informasi tidak akan dapat memulihkan dokumen XML secara otomatis ke formulir teks aslinya.
