RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter RSAOAEPKeyExchangeDeformatter Class


对最优不对称加密填充 (OAEP) 密钥交换数据进行解密。Decrypts Optimal Asymmetric Encryption Padding (OAEP) key exchange data.

public ref class RSAOAEPKeyExchangeDeformatter : System::Security::Cryptography::AsymmetricKeyExchangeDeformatter
public class RSAOAEPKeyExchangeDeformatter : System.Security.Cryptography.AsymmetricKeyExchangeDeformatter
type RSAOAEPKeyExchangeDeformatter = class
    inherit AsymmetricKeyExchangeDeformatter
Public Class RSAOAEPKeyExchangeDeformatter
Inherits AsymmetricKeyExchangeDeformatter


下面的示例演示如何使用RSAOAEPKeyExchangeDeformatter类重新创建用于解密消息的交换密钥。The following example shows how to use the RSAOAEPKeyExchangeDeformatter class to recreate an exchange key to be used to decrypt a message.

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
                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
            RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(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);

                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
            RSAOAEPKeyExchangeDeformatter keyDeformatter = new RSAOAEPKeyExchangeDeformatter(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);

                string message = Encoding.UTF8.GetString(plaintext.ToArray());
    public void Dispose()
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text

Class Alice

    Public Shared Sub Main(ByVal args() As String)
        Using bob As New Bob()
            Using rsaKey As New RSACryptoServiceProvider()
                    ' Get Bob's public 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)
            End Using
        End Using

    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)
        Using aes = New AesCryptoServiceProvider()

            iv = aes.IV

            ' Encrypt the session key
            Dim keyFormatter As New RSAOAEPKeyExchangeFormatter(key)
            encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, GetType(Aes))

            ' Encrypt the message
            Using ciphertext As New MemoryStream()
                Using cs As New CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write)
                    Dim plaintextMessage As Byte() = Encoding.UTF8.GetBytes(secretMessage)
                    cs.Write(plaintextMessage, 0, plaintextMessage.Length)

                    encryptedMessage = ciphertext.ToArray()
                End Using
            End Using
        End Using

    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)

        Using aes = New AesCryptoServiceProvider()

            aes.IV = iv

            ' Decrypt the session key
            Dim keyDeformatter As New RSAOAEPKeyExchangeDeformatter(rsaKey)
            aes.Key = keyDeformatter.DecryptKeyExchange(encryptedSessionKey)

            ' Decrypt the message
            Using plaintext As New MemoryStream()
                Using cs As New CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write)
                        cs.Write(encryptedMessage, 0, encryptedMessage.Length)

                        Dim message As String = Encoding.UTF8.GetString(plaintext.ToArray())
                End Using
            End Using
        End Using

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


密钥交换允许发件人创建机密信息, 例如, 可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, for example, random data that can be used as a key in a symmetric encryption algorithm, and use encryption to send it to the intended recipient.

用于RSAOAEPKeyExchangeFormatter使用RSA算法创建密钥交换消息。Use RSAOAEPKeyExchangeFormatter to create the key exchange message with the RSA algorithm.


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.


RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter() RSAOAEPKeyExchangeDeformatter()

初始化 RSAOAEPKeyExchangeDeformatter 类的新实例。Initializes a new instance of the RSAOAEPKeyExchangeDeformatter class.

RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeDeformatter(AsymmetricAlgorithm)

使用指定的密钥初始化 RSAOAEPKeyExchangeDeformatter 类的新实例。Initializes a new instance of the RSAOAEPKeyExchangeDeformatter class with the specified key.


Parameters Parameters Parameters Parameters

获取最优不对称加密填充 (OAEP) 密钥交换的参数。Gets the parameters for the Optimal Asymmetric Encryption Padding (OAEP) key exchange.


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

从加密密钥交换数据中提取机密信息。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)

设置用于解密机密信息的私钥。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)