AsymmetricKeyExchangeDeformatter AsymmetricKeyExchangeDeformatter AsymmetricKeyExchangeDeformatter AsymmetricKeyExchangeDeformatter Class

定义

表示所有非对称密钥交换反格式化程序均从中派生的基类。Represents the base class from which all asymmetric key exchange deformatters derive.

public ref class AsymmetricKeyExchangeDeformatter abstract
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class AsymmetricKeyExchangeDeformatter
type AsymmetricKeyExchangeDeformatter = class
Public MustInherit Class AsymmetricKeyExchangeDeformatter
继承
AsymmetricKeyExchangeDeformatterAsymmetricKeyExchangeDeformatterAsymmetricKeyExchangeDeformatterAsymmetricKeyExchangeDeformatter
派生
属性

示例

下面的示例演示如何扩展AsymmetricKeyExchangeDeformatter该类。The following example demonstrates how to extend the AsymmetricKeyExchangeDeformatter class.

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 RSACryptoServiceProvider 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 RSACryptoServiceProvider)
                {
                    RSACryptoServiceProvider serviceProvder =
                        (RSACryptoServiceProvider)rsaKey;

                    decryptedBytes = serviceProvder.Decrypt(rgbData, true);
                }
                // 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 RSACryptoServiceProvider 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 RSACryptoServiceProvider) Then
                    Dim rsaProvider As RSACryptoServiceProvider
                    rsaProvider = CType(rsaKey, RSACryptoServiceProvider)

                    decryptedBytes = rsaProvider.Decrypt(rgbData, True)
                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.

注解

非对称密钥交换反格式化程序解密密钥交换数据。Asymmetric key exchange deformatters decrypt key exchange data.

密钥交换允许发件人创建机密信息,如可以用作对称加密算法中的密钥的随机数据,并使用加密将它发送到目标接收方。Key exchange allows a sender to create secret information, such as random data that can be used as a key in a symmetric encryption algorithm, and use encryption to send it to the intended recipient.

注意

强烈建议您不要尝试使用所提供的基本功能来创建自己的密钥交换方法,因为必须仔细执行操作的许多详细信息,密钥交换才会成功。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.

构造函数

AsymmetricKeyExchangeDeformatter() AsymmetricKeyExchangeDeformatter() AsymmetricKeyExchangeDeformatter() AsymmetricKeyExchangeDeformatter()

初始化 AsymmetricKeyExchangeDeformatter 的新实例。Initializes a new instance of AsymmetricKeyExchangeDeformatter.

属性

Parameters Parameters Parameters Parameters

在派生类中重写时,获取或设置非对称密钥交换的参数。When overridden in a derived class, gets or sets the parameters for the asymmetric key exchange.

方法

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

在派生类中重写时,从加密的密钥交换数据中提取机密信息。When overridden in a derived class, extracts secret information from the encrypted key exchange data.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

获取当前实例的 TypeGets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(Inherited from Object)
SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm) SetKey(AsymmetricAlgorithm)

当在派生类中重写时,设置用于解密机密信息的私钥。When overridden in a derived class, sets the private key to use for decrypting the secret information.

ToString() ToString() ToString() ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(Inherited from Object)

适用于