RSAOAEPKeyExchangeFormatter RSAOAEPKeyExchangeFormatter RSAOAEPKeyExchangeFormatter RSAOAEPKeyExchangeFormatter Class


使用 RSA 创建最优不对称加密填充 (OAEP) 密钥交换数据。Creates Optimal Asymmetric Encryption Padding (OAEP) key exchange data using RSA.

public ref class RSAOAEPKeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatter
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
type RSAOAEPKeyExchangeFormatter = class
    inherit AsymmetricKeyExchangeFormatter
Public Class RSAOAEPKeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter


下面的示例演示如何使用RSAOAEPKeyExchangeFormatter类创建消息收件人的交换密钥。The following example shows how to use the RSAOAEPKeyExchangeFormatter class to create an exchange key for a message recipient.

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 'Alice

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 'Bob


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.

使用RSAOAEPKeyExchangeDeformatter接收密钥交换, 并从中提取机密信息。Use RSAOAEPKeyExchangeDeformatter to receive the key exchange and extract the secret information from it.


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.


RSAOAEPKeyExchangeFormatter() RSAOAEPKeyExchangeFormatter() RSAOAEPKeyExchangeFormatter() RSAOAEPKeyExchangeFormatter()

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

RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm) RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm)

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


Parameter Parameter Parameter Parameter

获取或设置用于在密钥交换创建过程中创建空白的参数。Gets or sets the parameter used to create padding in the key exchange creation process.

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.

Rng Rng Rng Rng

获取或设置要在密钥交换的创建中使用的随机数生成器算法。Gets or sets the random number generator algorithm to use in the creation of the key exchange.


CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[]) CreateKeyExchange(Byte[])

从指定的输入数据创建加密的密钥交换数据。Creates the encrypted key exchange data from the specified input data.

CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type) CreateKeyExchange(Byte[], Type)

从指定的输入数据创建加密的密钥交换数据。Creates the encrypted key exchange data from the specified input 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)

设置用于对密钥交换数据进行加密的公钥。Sets the public key to use for encrypting the key exchange data.

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)