AsymmetricKeyExchangeDeformatter Clase

Definición

Espacio de nombres:

System.Security.Cryptography

Ensamblado:

System.Security.Cryptography.Algorithms.dll

Ensamblado:

System.Security.Cryptography.dll

Ensamblado:

mscorlib.dll

Ensamblado:

netstandard.dll

Representa la clase base desde la que se derivan todos los desformateadores de intercambio de claves asimétricas.

public ref class AsymmetricKeyExchangeDeformatter abstract

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public abstract class AsymmetricKeyExchangeDeformatter

public abstract class AsymmetricKeyExchangeDeformatter

[System.Runtime.InteropServices.ComVisible(true)]
public abstract class AsymmetricKeyExchangeDeformatter

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type AsymmetricKeyExchangeDeformatter = class

type AsymmetricKeyExchangeDeformatter = class

[<System.Runtime.InteropServices.ComVisible(true)>]
type AsymmetricKeyExchangeDeformatter = class

Public MustInherit Class AsymmetricKeyExchangeDeformatter

Herencia

Object

AsymmetricKeyExchangeDeformatter

Derivado

System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter

System.Security.Cryptography.RSAPKCS1KeyExchangeDeformatter

Atributos

UnsupportedOSPlatformAttribute ComVisibleAttribute

Ejemplos

En el ejemplo siguiente se muestra cómo extender la AsymmetricKeyExchangeDeformatter clase .

using System;
using System.Security.Cryptography;

namespace Contoso
{
    public class ContosoDeformatter : AsymmetricKeyExchangeDeformatter
    {
        private RSA rsaKey;

        // Default constructor.
        public ContosoDeformatter(){}

        // Constructor with the public key to use for encryption.
        public ContosoDeformatter(AsymmetricAlgorithm key)
        {
            SetKey(key);
        }

        // Set the public key for encyption operations.
        public override void SetKey(AsymmetricAlgorithm key) {
            if (key != null)
            {
                rsaKey = (RSA)key;
            }
            else
            {
                throw new ArgumentNullException("key");
            }
        }

        // Disallow access to the parameters of the formatter.
        public override String Parameters 
        {
            get { return null; }
            set { ; }
        }

        // Create the encrypted key exchange data from the specified input
        // data. This method uses the RSA class only. To
        // support additional providers or provide custom decryption logic,
        // add logic to this member.
        public override byte[] DecryptKeyExchange(byte[] rgbData) {
            byte[] decryptedBytes = null;

            if (rsaKey != null)
            {
                if (rsaKey is RSA)
                {
                    RSA rsa = (RSA)rsaKey;

                    decryptedBytes = rsa.Decrypt(rgbData, RSAEncryptionPadding.OaepSHA1);
                }
                // Add custom decryption logic here.
            }
            else
            {
                throw new CryptographicUnexpectedOperationException(
                    "Cryptography_MissingKey");
            }

            return decryptedBytes;
        }
    }
}
//
// This code example produces the following output:
//
// Data to encrypt : Sample Contoso encryption application.
// Encrypted data: Khasdf-3248&$%23
// Data decrypted : Sample Contoso encryption application.
// 
// This sample completed successfully; press Enter to exit.

Imports System.Security.Cryptography

Namespace Contoso
    Public Class ContosoDeformatter
        Inherits AsymmetricKeyExchangeDeformatter

        Private rsaKey As RSA

        ' Default constructor.
        Public Sub New()

        End Sub

        ' Constructor with the public key to use for encryption.
        Public Sub New(ByVal key As AsymmetricAlgorithm)
            SetKey(key)
        End Sub

        ' Set the public key for encyption operations.
        Public Overrides Sub SetKey(ByVal key As AsymmetricAlgorithm)
            If (Not key Is Nothing) Then
                rsaKey = CType(key, RSA)
            Else
                Throw New ArgumentNullException("key")
            End If
        End Sub

        ' Disallow access to the parameters of the formatter.
        Public Overrides ReadOnly Property Parameters() As String
            Get
                Return Nothing
            End Get
            Set(ByVal Value As String)

            End Set
        End Property

        ' Create the encrypted key exchange data from the specified input
        ' data. This method uses the RSA class only. To
        ' support additional providers or provide custom decryption logic,
        ' add logic to this member.
        Public Overrides Function DecryptKeyExchange(
            ByVal rgbData() As Byte) As Byte()

            Dim decryptedBytes() As Byte

            If (Not rsaKey Is Nothing) Then
                If (TypeOf (rsaKey) Is RSA) Then
                    Dim rsa As RSA
                    rsa = CType(rsaKey, RSA)

                    decryptedBytes = rsa.Decrypt(rgbData, RSAEncryptionPadding.OaepSHA1)
                End If

                ' Add custom decryption logic here.

            Else
                Throw New CryptographicUnexpectedOperationException(
                    "Cryptography_MissingKey")
            End If

            Return decryptedBytes
        End Function

    End Class
End Namespace
'
' This code example produces the following output:
'
' Data to encrypt : Sample Contoso encryption application.
' Encrypted data: Kh34dfg-(*&834d+3
' Data decrypted : Sample Contoso encryption application.
' 
' This sample completed successfully; press Exit to continue.

Comentarios

Descifra los datos de intercambio de claves asimétricas.

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.

Precaución

Se recomienda encarecidamente 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 sea correcto.

Constructores

AsymmetricKeyExchangeDeformatter()

Inicializa una nueva instancia de la clase AsymmetricKeyExchangeDeformatter.

Propiedades

Parameters

Si se reemplaza en una clase derivada, obtiene o establece los parámetros del intercambio de claves asimétricas.

Métodos

DecryptKeyExchange(Byte[])	Si se reemplaza en una clase derivada, extrae información secreta de los datos cifrados de intercambio de claves.
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)	Si se reemplaza en una clase derivada, establece la clave privada que se usará para descifrar la información secreta.
ToString()	Devuelve una cadena que representa el objeto actual. (Heredado de Object)