AsymmetricKeyExchangeDeformatter Kelas

Definisi

Ruang nama:

System.Security.Cryptography

Rakitan:

System.Security.Cryptography.dll

Sumber:

AsymmetricKeyExchangeDeformatter.cs

Mewakili kelas dasar dari mana semua deformatter pertukaran kunci asimetris berasal.

public ref class AsymmetricKeyExchangeDeformatter abstract

public abstract class AsymmetricKeyExchangeDeformatter

type AsymmetricKeyExchangeDeformatter = class

Public MustInherit Class AsymmetricKeyExchangeDeformatter

Warisan

Object

AsymmetricKeyExchangeDeformatter

Turunan

System.Security.Cryptography.RSAOAEPKeyExchangeDeformatter

System.Security.Cryptography.RSAPKCS1KeyExchangeDeformatter

Contoh

Contoh berikut menunjukkan cara memperluas AsymmetricKeyExchangeDeformatter kelas.

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.

Keterangan

Deformatter pertukaran kunci asimetris mendekripsi data pertukaran kunci.

Pertukaran kunci memungkinkan pengirim untuk membuat informasi rahasia, seperti data acak yang dapat digunakan sebagai kunci dalam algoritma enkripsi simetris, dan menggunakan enkripsi untuk mengirimkannya ke penerima yang dimaksud.

Perhatian

Sangat disarankan agar Anda tidak mencoba membuat metode pertukaran kunci Anda sendiri dari fungsionalitas dasar yang disediakan, karena banyak detail operasi harus dilakukan dengan hati-hati agar pertukaran kunci berhasil.

Konstruktor

AsymmetricKeyExchangeDeformatter()

Menginisialisasi instans baru .AsymmetricKeyExchangeDeformatter

Properti

Parameters

Saat ditimpa di kelas turunan, mendapatkan atau mengatur parameter untuk pertukaran kunci asimetris.

Metode

DecryptKeyExchange(Byte[])	Saat ditimpa di kelas turunan, mengekstrak informasi rahasia dari data pertukaran kunci terenkripsi.
Equals(Object)	Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetHashCode()	Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetType()	Mendapatkan dari instans Type saat ini. (Diperoleh dari Object)
MemberwiseClone()	Membuat salinan dangkal dari saat ini Object. (Diperoleh dari Object)
SetKey(AsymmetricAlgorithm)	Saat ditimpa di kelas turunan, mengatur kunci privat yang akan digunakan untuk mendekripsi informasi rahasia.
ToString()	Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object)