EncryptedType.MimeType プロパティとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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EncryptedType.MimeType プロパティ

メモ : このプロパティは、.NET Framework version 2.0 で新しく追加されたものです。

XML 暗号化の EncryptedType インスタンスの MimeType 属性を取得または設定します。

名前空間: System.Security.Cryptography.Xml
アセンブリ: System.Security (system.security.dll 内)
構文

Visual Basic (宣言)

Public Overridable Property
 MimeType As String

Visual Basic (使用法)

Dim instance As EncryptedType
Dim value As String

value = instance.MimeType

instance.MimeType = value

public virtual string MimeType { get;
 set; }

C++

public:
virtual property String^ MimeType {
    String^ get ();
    void set (String^ value);
}

/** @property */
public String get_MimeType ()

/** @property */
public void set_MimeType (String value)

JScript

public function get MimeType
 () : String

public function set MimeType
 (value : String)

プロパティ値
暗号化されたデータのメディアタイプを記述する文字列。

解説

MimeType 属性は、暗号化されたデータのメディアタイプを記述するオプションの属性です。この属性の値は、RFC 2045『Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies』によって定義された値を含む文字列です。たとえば、暗号化されたデータが base64 でエンコードされた PNG である場合、Encoding 属性は 'http://www.w3.org/2000/09/xmldsig#base64'、および MimeType は 'image/png' となります。この属性はオプションであり、MimeType 情報の検証は必要ありません。この属性は、暗号化アプリケーションが何らかの追加の処理を行う必要があることを示してはいません。Type 属性の識別子に既にバインドされている場合は、この情報は必要ありません。

使用例

EncryptedType クラスから派生した EncryptedData クラスを使用して、XML 要素を暗号化および復号化する方法を次のコード例に示します。このサンプルを実行すると、EncryptedData クラスの各種のプロパティがコンソールに表示されます。

Visual Basic

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", 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 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

        ' 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 EncryptedData element from the XMLDocument object.
        Dim encryptedData As XmlElement = Doc.GetElementsByTagName("EncryptedData")(0)

        ' Create a new EncryptedData object.
        Dim encData As New
 EncryptedData()

        ' Load the XML from the document to
        ' initialize the EncryptedData object.
        encData.LoadXml(encryptedData)

        ' Display the properties.
        ' Most values are Null by default.


        Console.WriteLine("EncryptedData.CipherData: "
 + encData.CipherData.GetXml().InnerXml)
        Console.WriteLine("EncryptedData.Encoding: "
 + encData.Encoding)
        Console.WriteLine("EncryptedData.EncryptionMethod: "
 + encData.EncryptionMethod.GetXml().InnerXml)
        If encData.EncryptionProperties.Count >= 1 Then
            Console.WriteLine("EncryptedData.EncryptionProperties:
 " + encData.EncryptionProperties(0).GetXml().InnerXml)
        End If

        Console.WriteLine("EncryptedData.Id: " + encData.Id)
        Console.WriteLine("EncryptedData.KeyInfo: "
 + encData.KeyInfo.GetXml().InnerXml)
        Console.WriteLine("EncryptedData.MimeType: "
 + encData.MimeType)

    End Sub
End Module

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", 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 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;

        // 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 EncryptedData element from the XMLDocument object.
        XmlElement encryptedData = Doc.GetElementsByTagName("EncryptedData")[0]
 as XmlElement;

        // Create a new EncryptedData object.
        EncryptedData encData = new EncryptedData();

        // Load the XML from the document to
        // initialize the EncryptedData object.
        encData.LoadXml(encryptedData);

        // Display the properties.
        // Most values are Null by default.


        
        Console.WriteLine("EncryptedData.CipherData: " + encData.CipherData.GetXml().InnerXml);
        Console.WriteLine("EncryptedData.Encoding: " + encData.Encoding);
        Console.WriteLine("EncryptedData.EncryptionMethod: " + encData.EncryptionMethod.GetXml().InnerXml);
        if (encData.EncryptionProperties.Count >= 1)
        {
            Console.WriteLine("EncryptedData.EncryptionProperties: " +
 encData.EncryptionProperties[0].GetXml().InnerXml);
        }

        Console.WriteLine("EncryptedData.Id: " + encData.Id);
        Console.WriteLine("EncryptedData.KeyInfo: " + encData.KeyInfo.GetXml().InnerXml);
        Console.WriteLine("EncryptedData.MimeType: " + encData.MimeType);
    }

}

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
EncryptedType クラス
EncryptedType メンバ
System.Security.Cryptography.Xml 名前空間

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EncryptedType.MimeType プロパティとは？ わかりやすく解説

EncryptedType.MimeType プロパティ

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EncryptedType.MimeType プロパティとは？わかりやすく解説