RSAPKCS1KeyExchangeDeformatter 類別

參考

定義

命名空間:: System.Security.Cryptography

組件:: System.Security.Cryptography.Algorithms.dll

組件:: System.Security.Cryptography.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

解密 PKCS #1 金鑰交換資料。

public ref class RSAPKCS1KeyExchangeDeformatter : System::Security::Cryptography::AsymmetricKeyExchangeDeformatter

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAPKCS1KeyExchangeDeformatter : System.Security.Cryptography.AsymmetricKeyExchangeDeformatter

public class RSAPKCS1KeyExchangeDeformatter : System.Security.Cryptography.AsymmetricKeyExchangeDeformatter

[System.Runtime.InteropServices.ComVisible(true)]
public class RSAPKCS1KeyExchangeDeformatter : System.Security.Cryptography.AsymmetricKeyExchangeDeformatter

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAPKCS1KeyExchangeDeformatter = class
    inherit AsymmetricKeyExchangeDeformatter

type RSAPKCS1KeyExchangeDeformatter = class
    inherit AsymmetricKeyExchangeDeformatter

[<System.Runtime.InteropServices.ComVisible(true)>]
type RSAPKCS1KeyExchangeDeformatter = class
    inherit AsymmetricKeyExchangeDeformatter

Public Class RSAPKCS1KeyExchangeDeformatter
Inherits AsymmetricKeyExchangeDeformatter

繼承: Object

AsymmetricKeyExchangeDeformatter
RSAPKCS1KeyExchangeDeformatter

屬性: UnsupportedOSPlatformAttribute ComVisibleAttribute

範例

下列範例示範如何使用 RSAPKCS1KeyExchangeDeformatter 類別來重新建立交換金鑰，以用來解密訊息。

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
                rsaKey.ImportCspBlob(bob.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
            RSAPKCS1KeyExchangeFormatter keyFormatter = new RSAPKCS1KeyExchangeFormatter(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);
                cs.Close();

                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
            RSAPKCS1KeyExchangeDeformatter keyDeformatter = new RSAPKCS1KeyExchangeDeformatter(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);
                cs.Close();

                string message = Encoding.UTF8.GetString(plaintext.ToArray());
                Console.WriteLine(message);
            }
        }
    }
    public void Dispose()
    {
        rsaKey.Dispose();
    }
}

Imports System.IO
Imports System.Security.Cryptography
Imports System.Text




Class Alice

    Public Shared Sub Main(ByVal args() As String)
        Dim bob As New Bob()
        Try
            Dim rsaKey As New RSACryptoServiceProvider()
            Try
                ' Get Bob's public key
                rsaKey.ImportCspBlob(bob.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)
            Finally
                rsaKey.Dispose()
            End Try
        Finally
            bob.Dispose()
        End Try

    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)
        Dim aes = New AesCryptoServiceProvider()
        Try
            iv = aes.IV

            ' Encrypt the session key
            Dim keyFormatter As New RSAPKCS1KeyExchangeFormatter(key)
            encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, GetType(Aes))

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

                    encryptedMessage = ciphertext.ToArray()
                Finally
                    cs.Dispose()
                End Try
            Finally
                ciphertext.Dispose()
            End Try
        Finally
            aes.Dispose()
        End Try

    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)

        Dim aes = New AesCryptoServiceProvider()
        Try
            aes.IV = iv

            ' Decrypt the session key
            Dim keyDeformatter As New RSAPKCS1KeyExchangeDeformatter(rsaKey)
            aes.Key = keyDeformatter.DecryptKeyExchange(encryptedSessionKey)

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

                    Dim message As String = Encoding.UTF8.GetString(plaintext.ToArray())
                    Console.WriteLine(message)
                Finally
                    cs.Dispose()
                End Try
            Finally
                plaintext.Dispose()
            End Try
        Finally
            aes.Dispose()
        End Try

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

備註

金鑰交換可讓傳送者 (建立秘密資訊，例如可在對稱加密演算法中作為金鑰的亂數據) ，並使用加密將它傳送給預定收件者。

使用來 RSAPKCS1KeyExchangeFormatter 使用 RSA 演算法建立金鑰交換訊息。

警告

強烈建議您不要嘗試從提供的基本功能建立自己的金鑰交換方法，因為必須仔細執行作業的許多詳細資料，金鑰交換才能成功。

建構函式

RSAPKCS1KeyExchangeDeformatter()	初始化 RSAPKCS1KeyExchangeDeformatter 類別的新執行個體。
RSAPKCS1KeyExchangeDeformatter(AsymmetricAlgorithm)	使用指定的金鑰，初始化 RSAPKCS1KeyExchangeDeformatter 類別的新執行個體。

屬性

Parameters	取得 PKCS #1 金鑰交換的參數。
RNG	取得或設定於建立金鑰交換時所使用的隨機數字產生器演算法。

方法

DecryptKeyExchange(Byte[])	從加密的金鑰交換資料中擷取秘密資訊。
Equals(Object)	判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	做為預設雜湊函式。 (繼承來源 Object)
GetType()	取得目前執行個體的 Type。 (繼承來源 Object)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
SetKey(AsymmetricAlgorithm)	設定要用來解密機密資訊的私密金鑰。
ToString()	傳回代表目前物件的字串。 (繼承來源 Object)

適用於

另請參閱

密碼編譯服務

RSAPKCS1KeyExchangeDeformatter 類別

定義

範例

備註

建構函式

屬性

方法

適用於

另請參閱

其他資源