EncryptedKey Kelas

Definisi

Ruang nama:

System.Security.Cryptography.Xml

Rakitan:

System.Security.Cryptography.Xml.dll

Paket:

System.Security.Cryptography.Xml v9.0.0-rc.2.24473.5

Sumber:

EncryptedKey.cs

<EncryptedKey> Mewakili elemen dalam enkripsi XML. Kelas ini tidak dapat diwariskan.

public ref class EncryptedKey sealed : System::Security::Cryptography::Xml::EncryptedType

public sealed class EncryptedKey : System.Security.Cryptography.Xml.EncryptedType

type EncryptedKey = class
    inherit EncryptedType

Public NotInheritable Class EncryptedKey
Inherits EncryptedType

Warisan

Object

EncryptedType

EncryptedKey

Contoh

Contoh berikut mengilustrasikan cara mengenkripsi dan mendekripsi elemen XML dengan menggunakan EncryptedKey kelas . Contoh ini kemudian menampilkan nilai berbagai properti EncryptedKey kelas ke konsol.

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

Keterangan

Kelas ini mewakili <EncryptedKey> elemen dalam enkripsi XML. Elemen <EncryptedKey> ini digunakan untuk mengirim kunci enkripsi. Ini dapat dibuat dalam dokumen XML yang berdiri sendiri, ditempatkan dalam dokumen aplikasi, atau berada di dalam <EncryptedData> elemen sebagai anak dari <KeyInfo> elemen. Nilai kunci selalu dienkripsi ke penerima. Ketika <EncryptedKey> didekripsi, kunci yang dihasilkan tersedia untuk <EncryptionMethod> algoritma tanpa pemrosesan tambahan.

Elemen <EncryptedKey> ini mirip <EncryptedData> dengan elemen EncryptedData kelas kecuali bahwa data yang dienkripsi selalu merupakan nilai kunci.

Konstruktor

EncryptedKey()

Menginisialisasi instans baru kelas EncryptedKey.

Properti

CarriedKeyName	Mendapatkan atau mengatur elemen opsional <CarriedKeyName> dalam enkripsi XML.
CipherData	Mendapatkan atau menetapkan nilai untuk instans CipherDataEncryptedType kelas. (Diperoleh dari EncryptedType)
Encoding	Mendapatkan atau mengatur atribut EncryptedType instans Encoding dalam enkripsi XML. (Diperoleh dari EncryptedType)
EncryptionMethod	Mendapatkan atau mengatur <EncryptionMethod> elemen untuk enkripsi XML. (Diperoleh dari EncryptedType)
EncryptionProperties	Mendapatkan atau mengatur <EncryptionProperties> elemen dalam enkripsi XML. (Diperoleh dari EncryptedType)
Id	Mendapatkan atau mengatur atribut EncryptedType instans Id dalam enkripsi XML. (Diperoleh dari EncryptedType)
KeyInfo	Mendapatkan set <KeyInfo> elemen dalam enkripsi XML. (Diperoleh dari EncryptedType)
MimeType	Mendapatkan atau mengatur atribut EncryptedType instans MimeType dalam enkripsi XML. (Diperoleh dari EncryptedType)
Recipient	Mendapatkan atau mengatur atribut opsional Recipient dalam enkripsi XML.
ReferenceList	Mendapatkan atau mengatur <ReferenceList> elemen dalam enkripsi XML.
Type	Mendapatkan atau mengatur atribut EncryptedType instans Type dalam enkripsi XML. (Diperoleh dari EncryptedType)

Metode

AddProperty(EncryptionProperty)	Menambahkan elemen turunan <EncryptionProperty> ke <EncryptedProperties> elemen dalam objek saat ini EncryptedType dalam enkripsi XML. (Diperoleh dari EncryptedType)
AddReference(DataReference)	<DataReference> Menambahkan elemen ke <ReferenceList> elemen .
AddReference(KeyReference)	<KeyReference> Menambahkan elemen ke <ReferenceList> elemen .
Equals(Object)	Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetHashCode()	Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetType()	Mendapatkan instans Type saat ini. (Diperoleh dari Object)
GetXml()	Mengembalikan representasi XML objek EncryptedKey .
LoadXml(XmlElement)	Memuat informasi XML yang ditentukan ke <EncryptedKey> dalam elemen dalam enkripsi XML.
MemberwiseClone()	Membuat salinan dangkal dari yang saat ini Object. (Diperoleh dari Object)
ToString()	Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object)