AsymmetricKeyExchangeDeformatter Classe

Definizione

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

Ereditarietà

Object

AsymmetricKeyExchangeDeformatter

Derivato

System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter

System.Security.Cryptography.RSAPKCS1KeyExchangeDeformatter

Attributi

UnsupportedOSPlatformAttribute ComVisibleAttribute

Esempio

Nell'esempio seguente viene illustrato come estendere la AsymmetricKeyExchangeDeformatter classe .

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(nameof(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)
                {
                    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.

Commenti

I deformattori di scambio di chiavi asimmetriche decrittografano i dati dello scambio di chiavi.

Lo scambio di chiavi consente a un mittente di creare informazioni segrete, ad esempio dati casuali che possono essere usati come chiave in un algoritmo di crittografia simmetrica e usare la crittografia per inviarle al destinatario previsto.

Costruttori

Proprietà

Metodi

Si applica a