RSAOAEPKeyExchangeFormatter Kelas
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Membuat data pertukaran kunci Enkripsi Padding Asimetris Optimal (OAEP) menggunakan RSA.
public ref class RSAOAEPKeyExchangeFormatter : System::Security::Cryptography::AsymmetricKeyExchangeFormatter
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[System.Runtime.InteropServices.ComVisible(true)]
public class RSAOAEPKeyExchangeFormatter : System.Security.Cryptography.AsymmetricKeyExchangeFormatter
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
type RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
[<System.Runtime.InteropServices.ComVisible(true)>]
type RSAOAEPKeyExchangeFormatter = class
inherit AsymmetricKeyExchangeFormatter
Public Class RSAOAEPKeyExchangeFormatter
Inherits AsymmetricKeyExchangeFormatter
- Warisan
- Atribut
Contoh
Contoh berikut menunjukkan cara menggunakan RSAOAEPKeyExchangeFormatter kelas untuk membuat kunci pertukaran untuk penerima pesan.
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
Keterangan
Pertukaran kunci memungkinkan pengirim untuk membuat informasi rahasia, misalnya, data acak yang dapat digunakan sebagai kunci dalam algoritma enkripsi simetris, dan menggunakan enkripsi untuk mengirimkannya ke penerima yang dimaksud.
Gunakan RSAOAEPKeyExchangeDeformatter untuk menerima pertukaran kunci dan mengekstrak informasi rahasia darinya.
Perhatian
Sangat disarankan agar Anda tidak mencoba membuat metode pertukaran kunci Anda sendiri dari fungsionalitas dasar yang disediakan, karena banyak detail operasi harus dilakukan dengan hati-hati agar pertukaran kunci berhasil.
Konstruktor
RSAOAEPKeyExchangeFormatter() |
Menginisialisasi instans baru kelas RSAOAEPKeyExchangeFormatter. |
RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm) |
Menginisialisasi instans RSAOAEPKeyExchangeFormatter baru kelas dengan kunci yang ditentukan. |
Properti
Parameter |
Mendapatkan atau mengatur parameter yang digunakan untuk membuat padding dalam proses pembuatan pertukaran kunci. |
Parameters |
Mendapatkan parameter untuk pertukaran kunci Enkripsi Padding Asimetris Optimal (OAEP). |
Rng |
Mendapatkan atau mengatur algoritma generator angka acak untuk digunakan dalam pembuatan pertukaran kunci. |
Metode
CreateKeyExchange(Byte[]) |
Membuat data pertukaran kunci terenkripsi dari data input yang ditentukan. |
CreateKeyExchange(Byte[], Type) |
Membuat data pertukaran kunci terenkripsi dari data input yang ditentukan. |
Equals(Object) |
Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object) |
GetHashCode() |
Berfungsi sebagai fungsi hash default. (Diperoleh dari Object) |
GetType() |
Mendapatkan instans Type saat ini. (Diperoleh dari Object) |
MemberwiseClone() |
Membuat salinan dangkal dari yang saat ini Object. (Diperoleh dari Object) |
SetKey(AsymmetricAlgorithm) |
Mengatur kunci publik yang akan digunakan untuk mengenkripsi data pertukaran kunci. |
ToString() |
Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object) |