RSAOAEPKeyExchangeDeformatter-Klasse
Entschlüsselt OAEP-Schlüsselaustauschdaten (Optimal Asymmetric Encryption Padding).
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<ComVisibleAttribute(True)> _
Public Class RSAOAEPKeyExchangeDeformatter
Inherits AsymmetricKeyExchangeDeformatter
'Usage
Dim instance As RSAOAEPKeyExchangeDeformatter
[ComVisibleAttribute(true)]
public class RSAOAEPKeyExchangeDeformatter : AsymmetricKeyExchangeDeformatter
[ComVisibleAttribute(true)]
public ref class RSAOAEPKeyExchangeDeformatter : public AsymmetricKeyExchangeDeformatter
/** @attribute ComVisibleAttribute(true) */
public class RSAOAEPKeyExchangeDeformatter extends AsymmetricKeyExchangeDeformatter
ComVisibleAttribute(true)
public class RSAOAEPKeyExchangeDeformatter extends AsymmetricKeyExchangeDeformatter
Hinweise
Der Schlüsselaustausch ermöglicht es Absendern, vertrauliche Informationen zu erstellen, z. B. Zufallsdaten, die in einem symmetrischen Verschlüsselungsalgorithmus als Schlüssel verwendet werden können, und diese verschlüsselt an den gewünschten Empfänger zu senden.
Verwenden Sie RSAOAEPKeyExchangeFormatter, um die Schlüsselaustauschmeldung mit dem RSA-Algorithmus zu erstellen.
Warnung
Es wird dringend davon abgeraten, aus den bereitgestellten Basisfunktionen eine eigene Methode für den Schlüsselaustausch zu erstellen, da für einen erfolgreichen Schlüsselaustausch eine sorgfältige Ausführung zahlreicher Operationen erforderlich ist.
Beispiel
Im folgenden Codebeispiel wird die Verwendung von Membern der RSAOAEPKeyExchangeDeformatter-Klasse veranschaulicht.
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 RSAOAEPKeyExchangeDeformatter 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 RSAOAEPKeyExchangeFormatter(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 RSAOAEPKeyExchangeDeformatter 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 RSAOAEPKeyExchangeDeformatter(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 RSAOAEPKeyExchangeFormatter 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 RSAOAEPKeyExchangeFormatter
' Create an RSA and set it into the specified
' RSAOAEPKeyExchangeFormatter.
Dim key As RSA = RSA.Create()
rsaFormatter.SetKey(key)
' Create a random number using the RNGCryptoServiceProvider provider.
Dim ring As New RNGCryptoServiceProvider
rsaFormatter.Rng = ring
' Export InverseQ and set it into RSAOAEPKeyExchangeFormatter.
rsaFormatter.Parameter = key.ExportParameters(True).InverseQ
WriteLine(vbCrLf + "**" + rsaFormatter.ToString() + "**")
WriteLine("The following random number was generated for the class:")
WriteLine(rsaFormatter.Rng.ToString())
WriteLine(vbCrLf + "The RSA formatter contains the following " + _
"InverseQ parameter:")
WriteLine(Encoding.ASCII.GetString(rsaFormatter.Parameter))
Dim xmlParameters as string = rsaFormatter.Parameters
WriteLine(vbCrLf + "The RSA formatter has the following parameters:")
WriteLine(xmlParameters )
End Sub
' Create an RSAOAEPKeyExchangeDeformatter 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 RSAOAEPKeyExchangeDeformatter
' Create an RSAKey and set it into the specified
' RSAOAEPKeyExchangeDeformatter.
Dim key As RSA = RSA.Create()
rsaDeformatter.SetKey(key)
Dim xmlParameters as string = rsaDeformatter.Parameters
WriteLine(vbCrLf + "**" + rsaDeformatter.ToString() + "**")
WriteLine(vbCrLf + "The RSA deformatter has the following ")
WriteLine("parameters:" + xmlParameters)
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 = "RSAOAEPKeyExchangeFormatter"
Me.Panel2.ResumeLayout(False)
Me.Panel1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
#End Region
End Class
'
' This sample produces the following output:
'
' Encoding the following message:
' A phrase to be encoded.
' Resulting message encoded:k90)DU890fus8d9u*D_(8
' Resulting message decoded:
' A phrase to be encoded.
'
' **System.Security.Cryptography.RSAOAEPKeyExchangeFormatter**
' The following random number was generated for the class:
' System.Security.Cryptography.RNGCryptoServiceProvider
'
' The RSA formatter contains the following InverseQ parameter:
' J*Df89uDZ*(*F09
' The RSA formatter has the following parameters:
'
'
' **System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter**
'
' The RSA deformatter has the following
' parameters:
'
' This sample completed successfully; press Exit to continue.
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 continue.");
Console.ReadLine();
}
// Initialize an rsaKey member variable with the specified RSA key.
private void InitializeKey(RSA key)
{
rsaKey = key;
}
// Use the RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
private byte[] EncodeMessage(string message)
{
byte[] encodedMessage = null;
try
{
// Construct a formatter with the specified RSA key.
RSAOAEPKeyExchangeFormatter keyEncryptor =
new RSAOAEPKeyExchangeFormatter(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 RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
private string DecodeMessage(byte[] encodedMessage)
{
string decodedMessage = null;
try
{
// Construct a deformatter with the specified RSA key.
RSAOAEPKeyExchangeDeformatter keyDecryptor =
new RSAOAEPKeyExchangeDeformatter(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 RSAOAEPKeyExchangeFormatter 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.
RSAOAEPKeyExchangeFormatter rsaFormatter =
new RSAOAEPKeyExchangeFormatter();
// Create an RSA and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA key = RSA.Create();
rsaFormatter.SetKey(key);
// Create a random number using the RNGCryptoServiceProvider provider.
RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
rsaFormatter.Rng = ring;
// Export InverseQ and set it into the RSAOAEPKeyExchangeFormatter.
rsaFormatter.Parameter = key.ExportParameters(true).InverseQ;
Console.WriteLine();
Console.WriteLine("**" + rsaFormatter.ToString() + "**");
Console.Write("The following random number was generated using the ");
Console.WriteLine("class:");
Console.WriteLine(rsaFormatter.Rng);
Console.WriteLine();
Console.Write("The RSA formatter contains the following InverseQ");
Console.WriteLine(" parameter:");
Console.WriteLine(Encoding.ASCII.GetString(rsaFormatter.Parameter));
Console.WriteLine();
string xmlParameters = rsaFormatter.Parameters;
Console.WriteLine("The RSA formatter has the following parameters:");
Console.WriteLine(xmlParameters);
}
// Create an RSAOAEPKeyExchangeDeformatter object with a new RSA key.
// Display its properties to the console.
private void ConstructDeformatter()
{
// Construct an empty OAEP key exchange.
RSAOAEPKeyExchangeDeformatter rsaDeformatter =
new RSAOAEPKeyExchangeDeformatter();
// Create an RSAKey and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA key = RSA.Create();
rsaDeformatter.SetKey(key);
Console.WriteLine();
Console.WriteLine("**" + rsaDeformatter.ToString() + "**");
string xmlParameters = rsaDeformatter.Parameters;
Console.WriteLine();
Console.WriteLine("The RSA deformatter has the following ");
Console.WriteLine("parameters:" + xmlParameters);
}
}
//
// This sample produces the following output:
//
// Encoding the following message:
// A phrase to be encoded.
// Resulting message encoded: %?}T:v??xu?eD)YucItjwuALH HB,Uj??2xq?.?s45
// ?f?L2?=X?CPzWx???"q5?6&N"AE,Z+T?(]S?_7~,?G{?VV!:S?df?
// Resulting message decoded:
// A phrase to be encoded.
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeFormatter**
// The following random number was generated using the class:
// System.Security.Cryptography.RNGCryptoServiceProvider
//
// The RSA formatter contains the following InverseQ parameter:
// 3MM??]D#?mBq_;:ws^1?ko??,_ ??A[hyWcP$?`v.>@?^!dU%\?H0N'??Ca?Ns
//
// The RSA formatter has the following parameters:
//
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter**
//
// The RSA deformatter has the following
// parameters:
// This sample completed successfully, press enter to continue.
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 continue." );
Console::ReadLine();
}
private:
// Initialize an rsaKey member variable with the specified RSA key.
void InitializeKey( RSA^ key )
{
rsaKey = key;
}
// Use the RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
array<Byte>^ EncodeMessage( String^ message )
{
array<Byte>^encodedMessage = nullptr;
try
{
// Construct a formatter with the specified RSA key.
RSAOAEPKeyExchangeFormatter^ keyEncryptor =
gcnew RSAOAEPKeyExchangeFormatter( 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 RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
String^ DecodeMessage( array<Byte>^encodedMessage )
{
String^ decodedMessage = nullptr;
try
{
// Construct a deformatter with the specified RSA key.
RSAOAEPKeyExchangeDeformatter^ keyDecryptor =
gcnew RSAOAEPKeyExchangeDeformatter( 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 RSAOAEPKeyExchangeFormatter object with a new RSA key.
// Display its properties to the console.
void ConstructFormatter()
{
// Construct an empty Optimal Asymmetric Encryption Padding (OAEP)
// key exchange.
RSAOAEPKeyExchangeFormatter^ rsaFormatter = gcnew RSAOAEPKeyExchangeFormatter;
// Create an RSA and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA^ key = RSA::Create();
rsaFormatter->SetKey( key );
// Create a random number using the RNGCryptoServiceProvider provider.
RNGCryptoServiceProvider^ ring = gcnew RNGCryptoServiceProvider;
rsaFormatter->Rng = ring;
// Export InverseQ and set it into the RSAOAEPKeyExchangeFormatter.
rsaFormatter->Parameter = key->ExportParameters( true ).InverseQ;
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 );
Console::WriteLine();
Console::Write( L"The RSA formatter contains the following InverseQ" );
Console::WriteLine( L" parameter:" );
Console::WriteLine( Encoding::ASCII->GetString( rsaFormatter->Parameter ) );
Console::WriteLine();
String^ xmlParameters = rsaFormatter->Parameters;
Console::WriteLine( L"The RSA formatter has the following parameters:" );
Console::WriteLine( xmlParameters );
}
// Create an RSAOAEPKeyExchangeDeformatter object with a new RSA key.
// Display its properties to the console.
void ConstructDeformatter()
{
// Construct an empty OAEP key exchange.
RSAOAEPKeyExchangeDeformatter^ rsaDeformatter =
gcnew RSAOAEPKeyExchangeDeformatter;
// Create an RSAKey and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA^ key = RSA::Create();
rsaDeformatter->SetKey( key );
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();
}
//
// This sample produces the following output:
//
// Encoding the following message:
// A phrase to be encoded.
// Resulting message encoded: %?}T:v??xu?eD)YucItjwuALH HB,Uj??2xq?.?s45
// ?f?L2?=X?CPzWx???"q5?6&N"AE,Z+T?(]S?_7~,?G{?VV!:S?df?
// Resulting message decoded:
// A phrase to be encoded.
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeFormatter**
// The following random number was generated using the class:
// System.Security.Cryptography.RNGCryptoServiceProvider
//
// The RSA formatter contains the following InverseQ parameter:
// 3MM??]D#?mBq_;:ws^1?ko??,_ ??A[hyWcP$?`v.>@?^!dU%\?H0N'??Ca?Ns
//
// The RSA formatter has the following parameters:
//
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter**
//
// The RSA deformatter has the following
// parameters:
// This sample completed successfully, press enter to continue.
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 continue.");
Console.ReadLine();
} //main
// Initialize an rsaKey member variable with the specified RSA key.
private void InitializeKey(RSA key)
{
rsaKey = key;
} //InitializeKey
// Use the RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
private ubyte[] EncodeMessage(String message)
{
ubyte encodedMessage[] = null;
try {
// Construct a formatter with the specified RSA key.
RSAOAEPKeyExchangeFormatter keyEncryptor
= new RSAOAEPKeyExchangeFormatter(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 RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
private String DecodeMessage(ubyte encodedMessage[])
{
String decodedMessage = null;
try {
// Construct a deformatter with the specified RSA key.
RSAOAEPKeyExchangeDeformatter keyDecryptor
= new RSAOAEPKeyExchangeDeformatter(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 RSAOAEPKeyExchangeFormatter 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.
RSAOAEPKeyExchangeFormatter rsaFormatter
= new RSAOAEPKeyExchangeFormatter();
// Create an RSA and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA key = RSA.Create();
rsaFormatter.SetKey(key);
// Create a random number using the RNGCryptoServiceProvider provider.
RNGCryptoServiceProvider ring = new RNGCryptoServiceProvider();
rsaFormatter.set_Rng(ring);
// Export InverseQ and set it into the RSAOAEPKeyExchangeFormatter.
rsaFormatter.set_Parameter(key.ExportParameters(true).InverseQ);
Console.WriteLine();
Console.WriteLine("**" + rsaFormatter.ToString() + "**");
Console.Write("The following random number was generated using the ");
Console.WriteLine("class:");
Console.WriteLine(rsaFormatter.get_Rng());
Console.WriteLine();
Console.Write("The RSA formatter contains the following InverseQ");
Console.WriteLine(" parameter:");
Console.WriteLine(Encoding.get_ASCII().GetString(rsaFormatter.
get_Parameter()));
Console.WriteLine();
String xmlParameters = rsaFormatter.get_Parameters();
Console.WriteLine("The RSA formatter has the following parameters:");
Console.WriteLine(xmlParameters);
} //ConstructFormatter
// Create an RSAOAEPKeyExchangeDeformatter object with a new RSA key.
// Display its properties to the console.
private void ConstructDeformatter()
{
// Construct an empty OAEP key exchange.
RSAOAEPKeyExchangeDeformatter rsaDeformatter
= new RSAOAEPKeyExchangeDeformatter();
// Create an RSAKey and set it into the specified
// RSAOAEPKeyExchangeFormatter.
RSA key = RSA.Create();
rsaDeformatter.SetKey(key);
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
//
// This sample produces the following output:
//
// Encoding the following message:
// A phrase to be encoded.
// Resulting message encoded: %?}T:v??xu?eD)YucItjwuALH HB,Uj??2xq?.?s45
// ?f?L2?=X?CPzWx???"q5?6&N"AE,Z+T?(]S?_7~,?G{?VV!:S?df?
// Resulting message decoded:
// A phrase to be encoded.
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeFormatter**
// The following random number was generated using the class:
// System.Security.Cryptography.RNGCryptoServiceProvider
//
// The RSA formatter contains the following InverseQ parameter:
// 3MM??]D#?mBq_;:ws^1?ko??,_ ??A[hyWcP$?`v.>@?^!dU%\?H0N'??Ca?Ns
//
// The RSA formatter has the following parameters:
//
//
// **System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter**
//
// The RSA deformatter has the following
// parameters:
// This sample completed successfully, press enter to continue.
Vererbungshierarchie
System.Object
System.Security.Cryptography.AsymmetricKeyExchangeDeformatter
System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
Plattformen
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
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
RSAOAEPKeyExchangeDeformatter-Member
System.Security.Cryptography-Namespace