RSAOAEPKeyExchangeDeformatter.DecryptKeyExchange(Byte[]) Metode

Definisi

Ruang nama:

System.Security.Cryptography

Rakitan:

System.Security.Cryptography.dll

Sumber:

RSAOAEPKeyExchangeDeformatter.cs

Mengekstrak informasi rahasia dari data pertukaran kunci terenkripsi.

public:
 override cli::array <System::Byte> ^ DecryptKeyExchange(cli::array <System::Byte> ^ rgbData);

public override byte[] DecryptKeyExchange (byte[] rgbData);

override this.DecryptKeyExchange : byte[] -> byte[]

Public Overrides Function DecryptKeyExchange (rgbData As Byte()) As Byte()

Parameter

rgbData

Byte[]

Data pertukaran kunci di mana informasi rahasia disembunyikan.

Mengembalikan

Byte[]

Informasi rahasia yang berasal dari data pertukaran kunci.

Pengecualian

CryptographicException

Verifikasi data pertukaran kunci telah gagal.

CryptographicUnexpectedOperationException

Kuncinya hilang.

Contoh

Contoh berikut menunjukkan cara menggunakan DecryptKeyExchange metode untuk membuat ulang kunci pertukaran dari pengirim pesan. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk RSAPKCS1KeyExchangeDeformatter kelas .

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 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

Keterangan

Anda harus menentukan kunci sebelum memanggil metode ini.

Lihat juga

• Layanan Kriptografi