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RSAPKCS1KeyExchangeFormatter Clase

Definición

Crea los datos de intercambio de claves PKCS#1 mediante RSA.

public ref class RSAPKCS1KeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatter
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[System.Runtime.InteropServices.ComVisible(true)]
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAPKCS1KeyExchangeFormatter = class
    inherit AsymmetricKeyExchangeFormatter
type RSAPKCS1KeyExchangeFormatter = class
    inherit AsymmetricKeyExchangeFormatter
[<System.Runtime.InteropServices.ComVisible(true)>]
type RSAPKCS1KeyExchangeFormatter = class
    inherit AsymmetricKeyExchangeFormatter
Public Class RSAPKCS1KeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter
Herencia
RSAPKCS1KeyExchangeFormatter
Atributos

Ejemplos

En el ejemplo siguiente se muestra cómo usar la RSAPKCS1KeyExchangeFormatter clase para crear una clave de intercambio para un destinatario del mensaje.

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


    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
End Class

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

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

    End Sub

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

Comentarios

El intercambio de claves permite a un remitente crear información secreta (como datos aleatorios que se pueden usar como clave en un algoritmo de cifrado simétrico) y usar el cifrado para enviarlo al destinatario previsto.

Use RSAPKCS1KeyExchangeDeformatter para recibir el intercambio de claves y extraer la información secreta de ella.

Precaución

Se recomienda no intentar crear su propio método de intercambio de claves a partir de la funcionalidad básica proporcionada, ya que muchos detalles de la operación deben realizarse cuidadosamente para que el intercambio de claves se realice correctamente.

Constructores

RSAPKCS1KeyExchangeFormatter()

Inicializa una nueva instancia de la clase RSAPKCS1KeyExchangeFormatter.

RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm)

Inicializa una nueva instancia de la clase RSAPKCS1KeyExchangeFormatter con la clave especificada.

Propiedades

Parameters

Obtiene los parámetros del intercambio de claves PKCS #1.

Rng

Obtiene o establece el algoritmo de generador de números aleatorios para usarlos en la creación del intercambio de claves.

Métodos

CreateKeyExchange(Byte[], Type)

Crea los datos de intercambio de claves cifradas a partir de los datos de entrada especificados.

CreateKeyExchange(Byte[])

Crea los datos de intercambio de claves cifradas a partir de los datos de entrada especificados.

Equals(Object)

Determina si el objeto especificado es igual que el objeto actual.

(Heredado de Object)
GetHashCode()

Sirve como la función hash predeterminada.

(Heredado de Object)
GetType()

Obtiene el Type de la instancia actual.

(Heredado de Object)
MemberwiseClone()

Crea una copia superficial del Object actual.

(Heredado de Object)
SetKey(AsymmetricAlgorithm)

Establece la clave pública que se usará para cifrar los datos de intercambio de claves.

ToString()

Devuelve una cadena que representa el objeto actual.

(Heredado de Object)

Se aplica a

Consulte también