RSAPKCS1KeyExchangeDeformatter.DecryptKeyExchange(Byte[]) 方法

定義

命名空間:

System.Security.Cryptography

組件:

System.Security.Cryptography.dll

來源:

RSAPKCS1KeyExchangeDeformatter.cs

從加密的金鑰交換資料中擷取秘密資訊。

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

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

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

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

參數

rgbIn

Byte[]

隱藏秘密資訊的金鑰交換資料。

傳回

Byte[]

從金鑰交換資料中衍生的秘密資訊。

例外狀況

CryptographicUnexpectedOperationException

遺漏金鑰。

範例

下列範例示範如何使用 DecryptKeyExchange 方法來重新建立來自郵件發件人的交換密鑰。 此程式代碼範例是提供給 類別之較大範例的 RSAPKCS1KeyExchangeDeformatter 一部分。

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 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

備註

您必須先指定索引鍵，才能呼叫這個方法。

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