RSAPKCS1KeyExchangeFormatter 类
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
使用 RSA 创建 PKCS#1 密钥交换数据。
public ref class RSAPKCS1KeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatter
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[System.Runtime.InteropServices.ComVisible(true)]
public class RSAPKCS1KeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAPKCS1KeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
type RSAPKCS1KeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
[<System.Runtime.InteropServices.ComVisible(true)>]
type RSAPKCS1KeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
Public Class RSAPKCS1KeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter
- 继承
- 属性
示例
以下示例演示如何使用 RSAPKCS1KeyExchangeFormatter 类为邮件收件人创建交换密钥。
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
注解
密钥交换允许发送方创建机密信息 (例如可用作对称加密算法) 密钥的随机数据,并使用加密将其发送给目标接收方。
使用 RSAPKCS1KeyExchangeDeformatter 接收密钥交换并从中提取机密信息。
注意
建议不要尝试根据提供的基本功能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才能成功交换密钥。
构造函数
RSAPKCS1KeyExchangeFormatter() |
初始化 RSAPKCS1KeyExchangeFormatter 类的新实例。 |
RSAPKCS1KeyExchangeFormatter(AsymmetricAlgorithm) |
使用指定的密钥初始化 RSAPKCS1KeyExchangeFormatter 类的新实例。 |
属性
Parameters |
获取 PKCS #1 密钥交换的参数。 |
Rng |
获取或设置创建密钥交换时要使用的随机数生成器算法。 |
方法
CreateKeyExchange(Byte[]) |
从指定的输入数据创建加密的密钥交换数据。 |
CreateKeyExchange(Byte[], Type) |
从指定的输入数据创建加密的密钥交换数据。 |
Equals(Object) |
确定指定对象是否等于当前对象。 (继承自 Object) |
GetHashCode() |
作为默认哈希函数。 (继承自 Object) |
GetType() |
获取当前实例的 Type。 (继承自 Object) |
MemberwiseClone() |
创建当前 Object 的浅表副本。 (继承自 Object) |
SetKey(AsymmetricAlgorithm) |
设置要用于对密钥交换数据进行加密的公钥。 |
ToString() |
返回表示当前对象的字符串。 (继承自 Object) |