RSAOAEPKeyExchangeFormatter 类
定义
重要
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使用 RSA 创建最优非对称加密填充 (OAEP) 密钥交换数据。
public ref class RSAOAEPKeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatterpublic class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter[System.Runtime.InteropServices.ComVisible(true)]
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormattertype RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter[<System.Runtime.InteropServices.ComVisible(true)>]
type RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatterPublic Class RSAOAEPKeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter- 继承
- 属性
示例
以下示例演示如何使用 RSAOAEPKeyExchangeFormatter 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
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);
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
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);
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)
Using bob As New Bob()
Using rsaKey As New RSACryptoServiceProvider()
' 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)
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)
cs.Close()
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)
cs.Close()
Dim message As String = Encoding.UTF8.GetString(plaintext.ToArray())
Console.WriteLine(message)
End Using
End Using
End Using
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，可在对称加密算法中用作密钥的随机数据，并使用加密将其发送给目标接收方。
使用 RSAOAEPKeyExchangeDeformatter 接收密钥交换并从中提取机密信息。
注意
强烈建议不要尝试从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
| RSAOAEPKeyExchangeFormatter() |
初始化 RSAOAEPKeyExchangeFormatter 类的新实例。 |
| RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm) |
使用指定的密钥初始化 RSAOAEPKeyExchangeFormatter 类的新实例。 |
属性
| 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。 |
| Parameters |
获取或设置最优不对称加密填充 (OAEP) 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[], Type) |
从指定的输入数据创建加密的密钥交换数据。 |
| CreateKeyExchange(Byte[]) |
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) |
