RSAPKCS1KeyExchangeDeformatter クラス

.NET Framework クラス ライブラリ リファレンス

RSAPKCS1KeyExchangeDeformatter クラス

PKCS #1 キー交換データを復号化します。

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

Visual Basic (宣言)

<ComVisibleAttribute(True)> _
Public Class RSAPKCS1KeyExchangeDeformatter
    Inherits AsymmetricKeyExchangeDeformatter

Visual Basic (使用法)

Dim instance As RSAPKCS1KeyExchangeDeformatter

C#

[ComVisibleAttribute(true)] 
public class RSAPKCS1KeyExchangeDeformatter
 : AsymmetricKeyExchangeDeformatter

C++

[ComVisibleAttribute(true)] 
public ref class RSAPKCS1KeyExchangeDeformatter
 : public AsymmetricKeyExchangeDeformatter

J#

/** @attribute ComVisibleAttribute(true) */ 
public class RSAPKCS1KeyExchangeDeformatter
 extends AsymmetricKeyExchangeDeformatter

JScript

ComVisibleAttribute(true) 
public class RSAPKCS1KeyExchangeDeformatter
 extends AsymmetricKeyExchangeDeformatter

解説

キー交換を使用すると、送信者は、対称暗号化アルゴリズムでキーとして使用できるランダム データなどの秘密情報を作成し、それを暗号化して目的の受信者に送信できます。

RSA アルゴリズムを使用してキー交換メッセージを作成するには、RSAPKCS1KeyExchangeFormatter を使用します。

注意
キー交換を正常に行うには、細かな操作を慎重に実行する必要があるため、提供されている基本機能から独自のキー交換方法を作成することはお勧めできません。

使用例

RSAPKCS1KeyExchangeDeformatter クラスのメンバを使用する方法を次のコード例に示します。

Visual Basic

Imports System
Imports System.Security.Cryptography
Imports System.Text

Public Class Form1
    Inherits System.Windows.Forms.Form

    ' Use a member variable to hold the RSA key for encoding and decoding.
    Private rsaKey As RSA

    ' Event handler for Run button.
    Private Sub Button1_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles
 Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        Dim message As String
 = "A phrase to be encoded."

        InitializeKey(RSA.Create())

        WriteLine("Encoding the following message:")
        WriteLine(message)
        Dim encodedMessage() As Byte
 = EncodeMessage(message)
        WriteLine("Resulting message encoded:")
        WriteLine(Encoding.ASCII.GetString(encodedMessage))

        Dim decodedMessage As String
 = DecodeMessage(encodedMessage)
        WriteLine("Resulting message decoded:")
        WriteLine(decodedMessage)

        ' Construct a formatter to demonstrate how to set each property.
        ConstructFormatter()

        ' Construct a deformatter to demonstrate how to set each property.
        ConstructDeformatter()

        ' Align interface and conclude application.
        tbxOutput.AppendText(vbCrLf + "This sample completed "
 + _
            "successfully; press Exit to continue.")

        ' Reset the cursor.
        tbxOutput.Cursor = Cursors.Default
    End Sub
    ' Initialize an rsaKey member variable with the specified RSA key.
    private sub InitializeKey(byval
 key as RSA)
        rsaKey = key
    End Sub
    ' Use the RSAPKCS1KeyExchangeDeformatter class to decode the 
    ' specified message.
    Private Function EncodeMessage(ByVal
 message As String) As
 Byte()
        Dim encodedMessage() As Byte
 = Nothing

        Try
            ' Construct a formatter with the specified RSA key.
            Dim keyEncryptor As New
 RSAPKCS1KeyExchangeFormatter(rsaKey)

            ' Convert the message to bytes to create the encrypted data.
            Dim byteMessage() As Byte
            byteMessage = Encoding.ASCII.GetBytes(message)
            encodedMessage = keyEncryptor.CreateKeyExchange(byteMessage)

        Catch ex As Exception
            WriteLine("Unexpected exception caught:"
 + ex.ToString())
        End Try

        Return encodedMessage

    End Function
    ' Use the RSAPKCS1KeyExchangeDeformatter class to decode the
    ' specified message.
    Private Function DecodeMessage(ByVal
 encodedMessage() As Byte) As
 String
        Dim decodedMessage As String
 = Nothing

        Try
            ' Construct a deformatter with the specified RSA key.
            Dim keyDecryptor As New
 RSAPKCS1KeyExchangeDeformatter(rsaKey)

            ' Decrypt the encoded message.
            Dim decodedBytes() As Byte
            decodedBytes = keyDecryptor.DecryptKeyExchange(encodedMessage)

            ' Retrieve a string representation of the decoded message.
            decodedMessage = Encoding.ASCII.GetString(decodedBytes)
        Catch ex As Exception
            WriteLine("Unexpected exception caught:"
 + ex.ToString())
        End Try

        Return decodedMessage

    End Function
    ' Create an RSAPKCS1KeyExchangeFormatter object with a new RSA key.
    ' Display its properties to the console.
    Private Sub ConstructFormatter()
        ' Construct an empty Optimal Asymmetric Encryption Padding (OAEP)
        ' key exchange.
        Dim rsaFormatter = New RSAPKCS1KeyExchangeFormatter

        ' Create an RSAKey and set it into the specified 
        ' RSAPKCS1KeyExchangeFormatter.
        Dim key As RSA = RSA.Create()
        rsaFormatter.SetKey(key)

        ' Create a random number using RNGCryptoServiceProvider.
        Dim ring As New
 RNGCryptoServiceProvider
        rsaFormatter.Rng = ring

        WriteLine(vbCrLf + "**" + rsaFormatter.ToString()
 + "**")
        WriteLine("The following random number was generated for
 the class:")
        WriteLine(rsaFormatter.Rng.ToString())

        dim xmlParameters as string
 = rsaFormatter.Parameters

        WriteLine(vbCrLf + "The RSA formatter has the following
 parameters:")
        WriteLine(xmlParameters)
    End Sub

    ' Create an RSAPKCS1KeyExchangeDeformatter object with a new RSA
 key.
    ' Display its properties to the console.
    Private Sub ConstructDeformatter()
        ' Construct an empty OAEP key exchange.
        Dim rsaDeformatter As New
 RSAPKCS1KeyExchangeDeformatter

        ' Create an RSAKey and set it into the specified 
        ' RSAPKCS1KeyExchangeFormatter.
        Dim key As RSA = RSA.Create()
        rsaDeformatter.SetKey(key)

        Dim ring As New
 RNGCryptoServiceProvider
        rsaDeformatter.RNG = ring

        dim xmlParameters as string
 = rsaDeformatter.Parameters

        WriteLine(vbCrLf + "**" + rsaDeformatter.ToString()
 + "**")
        Write(vbCrLf + "The RSA deformatter has the following
 ")
        WriteLine("parameters:" + xmlParameters)
    End Sub
    ' Write message with carriage return to output textbox.
    Private Sub Write(ByVal
 message As String)
        tbxOutput.AppendText(message)
    End Sub
    ' Write message with carriage return to output textbox.
    Private Sub WriteLine(ByVal
 message As String)
        tbxOutput.AppendText(message + vbCrLf)
    End Sub
    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles
 Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides
 Sub Dispose(ByVal disposing As
 Boolean)
        If disposing Then
            If Not (components Is
 Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As
 System.Windows.Forms.Panel
    Friend WithEvents Panel1 As
 System.Windows.Forms.Panel
    Friend WithEvents Button1 As
 System.Windows.Forms.Button
    Friend WithEvents Button2 As
 System.Windows.Forms.Button
    Friend WithEvents tbxOutput As
 System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0,
 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616,
 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font(
 _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446,
 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75,
 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font(
 _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521,
 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75,
 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0,
 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616,
 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output
 textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20,
 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576,
 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run
 button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6,
 15)
        Me.ClientSize = New System.Drawing.Size(616,
 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "RSAPKCS1KeyExchangeFormatter"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class

C#

using System;
using System.Security.Cryptography;
using System.Text;

class RSAEncoder
{
    // Use a member variable to hold the RSA key for encoding and decoding.
    private RSA rsaKey;

    [STAThread]
    static void Main(string[]
 args)
    {
        string message = "A phrase to be encoded.";

        RSAEncoder rsaEncoder = new RSAEncoder();
        rsaEncoder.InitializeKey(RSA.Create());

        Console.WriteLine("Encoding the following message:");
        Console.WriteLine(message);
        byte[] encodedMessage = rsaEncoder.EncodeMessage(message);
        Console.WriteLine("Resulting message encoded:");
        Console.WriteLine(Encoding.ASCII.GetString(encodedMessage));

        string decodedMessage = rsaEncoder.DecodeMessage(encodedMessage);
        Console.WriteLine("Resulting message decoded:");
        Console.WriteLine(decodedMessage);

        // Construct a formatter to demonstrate how to set each property.
        rsaEncoder.ConstructFormatter();

        // Construct a deformatter to demonstrate how to set each property.
        rsaEncoder.ConstructDeformatter();

        Console.WriteLine("This sample completed successfully; " + 
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Initialize an rsaKey member variable with the specified RSA key.
    private void InitializeKey(RSA key)
    {
        rsaKey = key;
    }

    // Use the RSAPKCS1KeyExchangeDeformatter class to decode the 
    // specified message.
    private byte[] EncodeMessage(string message)
    {
        byte[] encodedMessage = null;

        try
        {
            // Construct a formatter with the specified RSA key.
            RSAPKCS1KeyExchangeFormatter keyEncryptor =
                new RSAPKCS1KeyExchangeFormatter(rsaKey);

            // Convert the message to bytes to create the encrypted
 data.
            byte[] byteMessage = Encoding.ASCII.GetBytes(message);
            encodedMessage = keyEncryptor.CreateKeyExchange(byteMessage);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Unexpected exception caught:" + ex.ToString());
        }

        return encodedMessage;
    }

    // Use the RSAPKCS1KeyExchangeDeformatter class to decode the
    // specified message.
    private string DecodeMessage(byte[] encodedMessage)
    {
        string decodedMessage = null;

        try
        {
            // Construct a deformatter with the specified RSA key.
            RSAPKCS1KeyExchangeDeformatter keyDecryptor =
                new RSAPKCS1KeyExchangeDeformatter(rsaKey);

            // Decrypt the encoded message.
            byte[] decodedBytes =
                keyDecryptor.DecryptKeyExchange(encodedMessage);

            // Retrieve a string representation of the decoded message.
            decodedMessage = Encoding.ASCII.GetString(decodedBytes);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Unexpected exception caught:" + ex.ToString());
        }

        return decodedMessage;
    }

    // Create an RSAPKCS1KeyExchangeFormatter object with a new RSA
 key.
    // Display its properties to the console.
    private void ConstructFormatter()
    {
        // Construct an empty Optimal Asymmetric Encryption Padding
 (OAEP)
        // key exchange.
        RSAPKCS1KeyExchangeFormatter rsaFormatter =
            new RSAPKCS1KeyExchangeFormatter();

        // Create an RSAKey and set it into the specified 
        // RSAPKCS1KeyExchangeFormatter.
        RSA key = RSA.Create();
        rsaFormatter.SetKey(key);

        // Create a random number using RNGCryptoServiceProvider.
        RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
 
        rsaFormatter.Rng = ring;

        Console.WriteLine();
        Console.WriteLine("**" + rsaFormatter.ToString() + "**");
        Console.Write("The following random number was generated using
 the ");
        Console.WriteLine("class:");
        Console.WriteLine(rsaFormatter.Rng);

        string xmlParameters = rsaFormatter.Parameters;

        Console.WriteLine();
        Console.WriteLine("The RSA formatter has the following parameters:");
        Console.WriteLine(rsaFormatter.Parameters);
    }

    // Create an RSAPKCS1KeyExchangeDeformatter object with a new RSA
 key.
    // Display its properties to the console.
    private void ConstructDeformatter()
    {
        // Construct an empty OAEP key exchange.
        RSAPKCS1KeyExchangeDeformatter rsaDeformatter = 
            new RSAPKCS1KeyExchangeDeformatter();

        // Create an RSAKey and set it into the specified 
        // RSAPKCS1KeyExchangeFormatter.
        RSA key = RSA.Create();
        rsaDeformatter.SetKey(key);

        RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
 
        rsaDeformatter.RNG = ring;

        Console.WriteLine();
        Console.WriteLine("**" + rsaDeformatter.ToString() + "**");

        string xmlParameters = rsaDeformatter.Parameters;

        Console.WriteLine();
        Console.WriteLine("The RSA deformatter has the following ");
        Console.WriteLine("parameters:" + xmlParameters);
    }
}

C++

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;

ref class RSAEncoder
{
private:
   // Use a member variable to hold the RSA key for encoding and decoding.
   RSA^ rsaKey;

public:
   [STAThread]
   static void Main()
   {
      String^ message = L"A phrase to be encoded.";
      RSAEncoder^ rsaEncoder = gcnew RSAEncoder;
      rsaEncoder->InitializeKey( RSA::Create() );
      Console::WriteLine( L"Encoding the following message:" );
      Console::WriteLine( message );
      array<Byte>^encodedMessage = rsaEncoder->EncodeMessage( message );
      Console::WriteLine( L"Resulting message encoded:" );
      Console::WriteLine( Encoding::ASCII->GetString( encodedMessage ) );
      String^ decodedMessage = rsaEncoder->DecodeMessage( encodedMessage );
      Console::WriteLine( L"Resulting message decoded:" );
      Console::WriteLine( decodedMessage );
      
      // Construct a formatter to demonstrate how to set each property.
      rsaEncoder->ConstructFormatter();
      
      // Construct a deformatter to demonstrate how to set each property.
      rsaEncoder->ConstructDeformatter();
      Console::WriteLine( L"This sample completed successfully; "
         L"press Enter to exit." );
      Console::ReadLine();
   }

private:
   // Initialize an rsaKey member variable with the specified RSA key.
   void InitializeKey( RSA^ key )
   {
      rsaKey = key;
   }

   // Use the RSAPKCS1KeyExchangeDeformatter class to decode the
   // specified message.
   array<Byte>^ EncodeMessage( String^ message )
   {
      array<Byte>^encodedMessage = nullptr;
      try
      {
         // Construct a formatter with the specified RSA key.
         RSAPKCS1KeyExchangeFormatter^ keyEncryptor =
            gcnew RSAPKCS1KeyExchangeFormatter( rsaKey );

         // Convert the message to bytes to create the encrypted data.
         array<Byte>^byteMessage = Encoding::ASCII->GetBytes( message );
         encodedMessage = keyEncryptor->CreateKeyExchange( byteMessage );
      }
      catch ( Exception^ ex ) 
      {
         Console::WriteLine( L"Unexpected exception caught:{0}", ex );
      }

      return encodedMessage;
   }

   // Use the RSAPKCS1KeyExchangeDeformatter class to decode the
   // specified message.
   String^ DecodeMessage( array<Byte>^encodedMessage )
   {
      String^ decodedMessage = nullptr;
      try
      {
         // Construct a deformatter with the specified RSA key.
         RSAPKCS1KeyExchangeDeformatter^ keyDecryptor =
            gcnew RSAPKCS1KeyExchangeDeformatter( rsaKey );

         // Decrypt the encoded message.
         array<Byte>^decodedBytes = keyDecryptor->DecryptKeyExchange( encodedMessage
 );

         // Retrieve a string representation of the decoded message.
         decodedMessage = Encoding::ASCII->GetString( decodedBytes );
      }
      catch ( Exception^ ex ) 
      {
         Console::WriteLine( L"Unexpected exception caught:{0}", ex );
      }

      return decodedMessage;
   }

   // Create an RSAPKCS1KeyExchangeFormatter object with a new RSA key.
   // Display its properties to the console.
   void ConstructFormatter()
   {
      // Construct an empty Optimal Asymmetric Encryption Padding (OAEP)
      // key exchange.
      RSAPKCS1KeyExchangeFormatter^ rsaFormatter =
         gcnew RSAPKCS1KeyExchangeFormatter;

      // Create an RSAKey and set it into the specified
      // RSAPKCS1KeyExchangeFormatter.
      RSA^ key = RSA::Create();
      rsaFormatter->SetKey( key );

     // Create a random number using RNGCryptoServiceProvider.
      RNGCryptoServiceProvider^ ring = gcnew RNGCryptoServiceProvider;
      rsaFormatter->Rng = ring;

      Console::WriteLine();
      Console::WriteLine( L"**{0}**", rsaFormatter );
      Console::Write( L"The following random number was generated using
 the " );
      Console::WriteLine( L"class:" );
      Console::WriteLine( rsaFormatter->Rng );
      
      String^ xmlParameters = rsaFormatter->Parameters;

      Console::WriteLine();
      Console::WriteLine( L"The RSA formatter has the following parameters:"
 );
      Console::WriteLine( rsaFormatter->Parameters );
   }

   // Create an RSAPKCS1KeyExchangeDeformatter object with a new RSA
 key.
   // Display its properties to the console.
   void ConstructDeformatter()
   {
      // Construct an empty OAEP key exchange.
      RSAPKCS1KeyExchangeDeformatter^ rsaDeformatter =
         gcnew RSAPKCS1KeyExchangeDeformatter;

      // Create an RSAKey and set it into the specified
      // RSAPKCS1KeyExchangeFormatter.
      RSA^ key = RSA::Create();
      rsaDeformatter->SetKey( key );

      RNGCryptoServiceProvider^ ring = gcnew RNGCryptoServiceProvider;
      rsaDeformatter->RNG = ring;

      Console::WriteLine();
      Console::WriteLine( L"**{0}**", rsaDeformatter );
      
      String^ xmlParameters = rsaDeformatter->Parameters;

      Console::WriteLine();
      Console::WriteLine( L"The RSA deformatter has the following " );
      Console::WriteLine( L"parameters:{0}", xmlParameters );
   }
};

int main()
{
   RSAEncoder::Main();
}

J#

import System.*;
import System.Security.Cryptography.*;
import System.Text.*;

class RSAEncoder
{
    // Use a member variable to hold the RSA key for encoding and decoding.
    private RSA rsaKey;

    /** @attribute STAThread()
     */
    public static void main(String[]
 args)
    {
        String message = "A phrase to be encoded.";

        RSAEncoder rsaEncoder = new RSAEncoder();
        rsaEncoder.InitializeKey(RSA.Create());

        Console.WriteLine("Encoding the following message:");
        Console.WriteLine(message);
        ubyte encodedMessage[] = rsaEncoder.EncodeMessage(message);
        Console.WriteLine("Resulting message encoded:");
        Console.WriteLine(Encoding.get_ASCII().GetString(encodedMessage));

        String decodedMessage = rsaEncoder.DecodeMessage(encodedMessage);
        Console.WriteLine("Resulting message decoded:");
        Console.WriteLine(decodedMessage);
        // Construct a formatter to demonstrate how to set each property.
        rsaEncoder.ConstructFormatter();
        // Construct a deformatter to demonstrate how to set each property.
        rsaEncoder.ConstructDeformatter();

        Console.WriteLine("This sample completed successfully; " 
            + "press Enter to exit.");
        Console.ReadLine();
    } //main

    // Initialize an rsaKey member variable with the specified RSA key.
    private void InitializeKey(RSA key)
    {
        rsaKey = key;
    } //InitializeKey

    // Use the RSAPKCS1KeyExchangeDeformatter class to decode the 
    // specified message.
    private ubyte[] EncodeMessage(String message)
    {
        ubyte encodedMessage[] = null;
        try {
            // Construct a formatter with the specified RSA key.
            RSAPKCS1KeyExchangeFormatter keyEncryptor 
                = new RSAPKCS1KeyExchangeFormatter(rsaKey);

            // Convert the message to bytes to create the encrypted
 data.
            ubyte byteMessage[] = Encoding.get_ASCII().GetBytes(message);
            encodedMessage = keyEncryptor.CreateKeyExchange(byteMessage);
        } 
        catch (System.Exception ex) {
            Console.WriteLine("Unexpected exception caught:" + ex.ToString());
        }
        return encodedMessage;
    } //EncodeMessage

    // Use the RSAPKCS1KeyExchangeDeformatter class to decode the
    // specified message.
    private String DecodeMessage(ubyte encodedMessage[])
    {
        String decodedMessage = null;
        try {
            // Construct a deformatter with the specified RSA key.
            RSAPKCS1KeyExchangeDeformatter keyDecryptor 
                = new RSAPKCS1KeyExchangeDeformatter(rsaKey);

            // Decrypt the encoded message.
            ubyte decodedBytes[] = keyDecryptor.
                DecryptKeyExchange(encodedMessage);

            // Retrieve a string representation of the decoded message.
            decodedMessage = Encoding.get_ASCII().GetString(decodedBytes);
        }
        catch (System.Exception ex) {
            Console.WriteLine("Unexpected exception caught:" 
                + ex.ToString());
        }
        return decodedMessage;
    } //DecodeMessage

    // Create an RSAPKCS1KeyExchangeFormatter object with a new RSA
 key.
    // Display its properties to the console.
    private void ConstructFormatter()
    {
        // Construct an empty Optimal Asymmetric Encryption Padding
 (OAEP)
        // key exchange.
        RSAPKCS1KeyExchangeFormatter rsaFormatter 
            = new RSAPKCS1KeyExchangeFormatter();

        // Create an RSAKey and set it into the specified 
        // RSAPKCS1KeyExchangeFormatter.
        RSA key = RSA.Create();
        rsaFormatter.SetKey(key);

        // Create a random number using RNGCryptoServiceProvider.
        RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
        rsaFormatter.set_Rng(ring);

        Console.WriteLine();
        Console.WriteLine("**" + rsaFormatter.ToString() + "**");
        Console.Write("The following random number was generated using
 the ");
        Console.WriteLine("class:");
        Console.WriteLine(rsaFormatter.get_Rng());
        String xmlParameters = rsaFormatter.get_Parameters();

        Console.WriteLine();
        Console.WriteLine("The RSA formatter has the following parameters:");
        Console.WriteLine(rsaFormatter.get_Parameters());
    } //ConstructFormatter

    // Create an RSAPKCS1KeyExchangeDeformatter object with a new RSA
 key.
    // Display its properties to the console.
    private void ConstructDeformatter()
    {
        // Construct an empty OAEP key exchange.
        RSAPKCS1KeyExchangeDeformatter rsaDeformatter 
            = new RSAPKCS1KeyExchangeDeformatter();

        // Create an RSAKey and set it into the specified 
        // RSAPKCS1KeyExchangeFormatter.
        RSA key = RSA.Create();
        rsaDeformatter.SetKey(key);

        RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
        rsaDeformatter.set_RNG(ring);

        Console.WriteLine();
        Console.WriteLine("**" + rsaDeformatter.ToString() + "**");
        String xmlParameters = rsaDeformatter.get_Parameters();

        Console.WriteLine();
        Console.WriteLine("The RSA deformatter has the following ");
        Console.WriteLine("parameters:" + xmlParameters);
    } //ConstructDeformatter
} //RSAEncoder

継承階層

System.Object
   System.Security.Cryptography.AsymmetricKeyExchangeDeformatter
    System.Security.Cryptography.RSAPKCS1KeyExchangeDeformatter

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
RSAPKCS1KeyExchangeDeformatter メンバ
System.Security.Cryptography 名前空間
その他の技術情報
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