RSAPKCS1KeyExchangeFormatter RSAPKCS1KeyExchangeFormatter RSAPKCS1KeyExchangeFormatter RSAPKCS1KeyExchangeFormatter Class

Définition

Crée les données d'échange de clés PKCS #1 à l'aide de RSA.Creates the PKCS#1 key exchange data using RSA.

public ref class RSAPKCS1KeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatter
[System.Runtime.InteropServices.ComVisible(true)]
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
type RSAPKCS1KeyExchangeFormatter = class
    inherit AsymmetricKeyExchangeFormatter
Public Class RSAPKCS1KeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter
Héritage
RSAPKCS1KeyExchangeFormatterRSAPKCS1KeyExchangeFormatterRSAPKCS1KeyExchangeFormatterRSAPKCS1KeyExchangeFormatter
Attributs

Exemples

L’exemple suivant montre comment utiliser la RSAPKCS1KeyExchangeFormatter classe pour créer une clé d’échange pour un destinataire de message.The following example shows how to use the RSAPKCS1KeyExchangeFormatter class to create an exchange key for a message recipient.

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


class Alice
{
    public static void Main(string[] args)
    {
        using (Bob bob = new Bob())
        {
            using (RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider())
            {
                // Get Bob's public key
                rsaKey.ImportCspBlob(bob.key);
                byte[] encryptedSessionKey = null;
                byte[] encryptedMessage = null;
                byte[] iv = null;
                Send(rsaKey, "Secret message", out iv, out encryptedSessionKey, out encryptedMessage);
                bob.Receive(iv, encryptedSessionKey, encryptedMessage);
            }
        }
    }

    private static void Send(RSA key, string secretMessage, out byte[] iv, out byte[] encryptedSessionKey, out byte[] encryptedMessage)
    {
        using (Aes aes = new AesCryptoServiceProvider())
        {
            iv = aes.IV;

            // Encrypt the session key
            RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(key);
            encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, typeof(Aes));

            // Encrypt the message
            using (MemoryStream ciphertext = new MemoryStream())
            using (CryptoStream cs = new CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write))
            {
                byte[] plaintextMessage = Encoding.UTF8.GetBytes(secretMessage);
                cs.Write(plaintextMessage, 0, plaintextMessage.Length);
                cs.Close();

                encryptedMessage = ciphertext.ToArray();
            }
        }
    }

}
public class Bob : IDisposable
{
    public byte[] key;
    private RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider();
    public Bob()
    {
        key = rsaKey.ExportCspBlob(false);
    }
    public void Receive(byte[] iv, byte[] encryptedSessionKey, byte[] encryptedMessage)
    {

        using (Aes aes = new AesCryptoServiceProvider())
        {
            aes.IV = iv;

            // Decrypt the session key
            RSAPKCS1KeyExchangeDeformatter keyDeformatter = new RSAPKCS1KeyExchangeDeformatter(rsaKey);
            aes.Key = keyDeformatter.DecryptKeyExchange(encryptedSessionKey);

            // Decrypt the message
            using (MemoryStream plaintext = new MemoryStream())
            using (CryptoStream cs = new CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(encryptedMessage, 0, encryptedMessage.Length);
                cs.Close();

                string message = Encoding.UTF8.GetString(plaintext.ToArray());
                Console.WriteLine(message);
            }
        }
    }
    public void Dispose()
    {
        rsaKey.Dispose();
    }
}
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text




Class Alice

    Public Shared Sub Main(ByVal args() As String)
        Dim bob As New Bob()
        Try
            Dim rsaKey As New RSACryptoServiceProvider()
            Try
                ' Get Bob's public key
                rsaKey.ImportCspBlob(bob.key)
                Dim encryptedSessionKey As Byte() = Nothing
                Dim encryptedMessage As Byte() = Nothing
                Dim iv As Byte() = Nothing
                Send(rsaKey, "Secret message", iv, encryptedSessionKey, encryptedMessage)
                bob.Receive(iv, encryptedSessionKey, encryptedMessage)
            Finally
                rsaKey.Dispose()
            End Try
        Finally
            bob.Dispose()
        End Try

    End Sub 'Main


    Private Shared Sub Send(ByVal key As RSA, ByVal secretMessage As String, ByRef iv() As Byte, ByRef encryptedSessionKey() As Byte, ByRef encryptedMessage() As Byte)
        Dim aes = New AesCryptoServiceProvider()
        Try
            iv = aes.IV

            ' Encrypt the session key
            Dim keyFormatter As New RSAPKCS1KeyExchangeFormatter(key)
            encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, GetType(Aes))

            ' Encrypt the message
            Dim ciphertext As New MemoryStream()
            Try
                Dim cs As New CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write)
                Try
                    Dim plaintextMessage As Byte() = Encoding.UTF8.GetBytes(secretMessage)
                    cs.Write(plaintextMessage, 0, plaintextMessage.Length)
                    cs.Close()

                    encryptedMessage = ciphertext.ToArray()
                Finally
                    cs.Dispose()
                End Try
            Finally
                ciphertext.Dispose()
            End Try
        Finally
            aes.Dispose()
        End Try

    End Sub 'Send 
End Class 'Alice

Public Class Bob
    Implements IDisposable
    Public key() As Byte
    Private rsaKey As New RSACryptoServiceProvider()

    Public Sub New()
        key = rsaKey.ExportCspBlob(False)

    End Sub 'New

    Public Sub Receive(ByVal iv() As Byte, ByVal encryptedSessionKey() As Byte, ByVal encryptedMessage() As Byte)

        Dim aes = New AesCryptoServiceProvider()
        Try
            aes.IV = iv

            ' Decrypt the session key
            Dim keyDeformatter As New RSAPKCS1KeyExchangeDeformatter(rsaKey)
            aes.Key = keyDeformatter.DecryptKeyExchange(encryptedSessionKey)

            ' Decrypt the message
            Dim plaintext As New MemoryStream()
            Try
                Dim cs As New CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write)
                Try
                    cs.Write(encryptedMessage, 0, encryptedMessage.Length)
                    cs.Close()

                    Dim message As String = Encoding.UTF8.GetString(plaintext.ToArray())
                    Console.WriteLine(message)
                Finally
                    cs.Dispose()
                End Try
            Finally
                plaintext.Dispose()
            End Try
        Finally
            aes.Dispose()
        End Try

    End Sub 'Receive
    Public Overloads Sub Dispose() Implements IDisposable.Dispose
        rsaKey.Dispose()
    End Sub 'Dispose
End Class 'Bob

Remarques

L’échange de clés permet à un expéditeur de créer des informations secrètes (telles que des données aléatoires qui peuvent être utilisées comme clé dans un algorithme de chiffrement symétrique) et d’utiliser le chiffrement pour les envoyer au destinataire prévu.Key exchange allows a sender to create secret information (such as random data that can be used as a key in a symmetric encryption algorithm) and use encryption to send it to the intended recipient.

Utilisez RSAPKCS1KeyExchangeDeformatter pour recevoir l’échange de clés et en extraire les informations confidentielles.Use RSAPKCS1KeyExchangeDeformatter to receive the key exchange and extract the secret information from it.

Attention

Nous vous recommandons de ne pas essayer de créer votre propre méthode d’échange de clés à partir de la fonctionnalité de base fournie, car de nombreux détails de l’opération doivent être exécutés soigneusement pour que l’échange de clés aboutisse.We recommend that you do not attempt to create your own key exchange method from the basic functionality provided, because many details of the operation must be performed carefully in order for the key exchange to be successful.

Constructeurs

RSAPKCS1KeyExchangeFormatter() RSAPKCS1KeyExchangeFormatter() RSAPKCS1KeyExchangeFormatter() RSAPKCS1KeyExchangeFormatter()

Initialise une nouvelle instance de la classe RSAPKCS1KeyExchangeFormatter.Initializes a new instance of the RSAPKCS1KeyExchangeFormatter class.

RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm) RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm) RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm) RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm)

Initialise une nouvelle instance de la classe RSAPKCS1KeyExchangeFormatter avec la clé spécifiée.Initializes a new instance of the RSAPKCS1KeyExchangeFormatter class with the specified key.

Propriétés

Parameters Parameters Parameters Parameters

Obtient les paramètres pour l'échange de clés PKCS #1.Gets the parameters for the PKCS #1 key exchange.

Rng Rng Rng Rng

Obtient ou définit l'algorithme du générateur de nombres aléatoires à utiliser dans la création d'échange de clés.Gets or sets the random number generator algorithm to use in the creation of the key exchange.

Méthodes

CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[])

Crée les données d’échange de clés chiffrées à partir des données d’entrée spécifiées.Creates the encrypted key exchange data from the specified input data.

CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type)

Crée les données d’échange de clés chiffrées à partir des données d’entrée spécifiées.Creates the encrypted key exchange data from the specified input data.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Détermine si l'objet spécifié est identique à l'objet actuel.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Fait office de fonction de hachage par défaut.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Obtient le Type de l'instance actuelle.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crée une copie superficielle de l'objet Object actuel.Creates a shallow copy of the current Object.

(Inherited from Object)
SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm)

Définit la clé publique à utiliser pour chiffrer les données d'échange de clés.Sets the public key to use for encrypting the key exchange data.

ToString() ToString() ToString() ToString()

Retourne une chaîne qui représente l'objet actuel.Returns a string that represents the current object.

(Inherited from Object)

S’applique à

Voir aussi