RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter Class

Définition

Déchiffre les données d'échange de clés OAEP (Optimal Asymmetric Encryption Padding).Decrypts Optimal Asymmetric Encryption Padding (OAEP) key exchange data.

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

Exemples

L’exemple suivant montre comment utiliser la RSAOAEPKeyExchangeDeformatter classe pour recréer une clé d’échange à utiliser pour déchiffrer un message.The following example shows how to use the RSAOAEPKeyExchangeDeformatter class to recreate an exchange key to be used to decrypt a message.

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
            RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(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
            RSAOAEPKeyExchangeDeformatter keyDeformatter = new RSAOAEPKeyExchangeDeformatter(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
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text




Class Alice

    Public Shared Sub Main(ByVal args() As String)
        Using bob As New Bob()
            Using rsaKey As New RSACryptoServiceProvider()
                    ' 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)
            End Using
        End Using

    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)
        Using aes = New AesCryptoServiceProvider()

            iv = aes.IV

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

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

                    encryptedMessage = ciphertext.ToArray()
                End Using
            End Using
        End Using

    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)

        Using aes = New AesCryptoServiceProvider()

            aes.IV = iv

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

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

                        Dim message As String = Encoding.UTF8.GetString(plaintext.ToArray())
                        Console.WriteLine(message)
                End Using
            End Using
        End Using

    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 confidentielles, par exemple 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, for example, 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 RSAOAEPKeyExchangeFormatter pour créer le message d’échange de clés RSA avec l’algorithme.Use RSAOAEPKeyExchangeFormatter to create the key exchange message with the RSA algorithm.

Attention

Il est vivement recommandé 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 avec prudence pour que l’échange de clés aboutisse.It is highly recommended that you 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

RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter()

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

RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm)

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

Propriétés

Parameters Parameters Parameters Parameters

Obtient les paramètres pour l'échange de clés OAEP (Optimal Asymmetric Encryption Padding).Gets the parameters for the Optimal Asymmetric Encryption Padding (OAEP) key exchange.

Méthodes

DecryptKeyExchange(Byte[]) DecryptKeyExchange(Byte[]) DecryptKeyExchange(Byte[]) DecryptKeyExchange(Byte[])

Extrait les informations confidentielles à partir des données d'échange de clés chiffrées.Extracts secret information from the encrypted key exchange 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 privée à utiliser pour déchiffrer les informations confidentielles.Sets the private key to use for decrypting the secret information.

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