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RSAOAEPKeyExchangeFormatter.CreateKeyExchange 方法

定義

建立加密的金鑰交換資料。

多載

CreateKeyExchange(Byte[])

從指定的輸入資料建立加密的金鑰交換資料。

CreateKeyExchange(Byte[], Type)

從指定的輸入資料建立加密的金鑰交換資料。

CreateKeyExchange(Byte[])

來源:
RSAOAEPKeyExchangeFormatter.cs
來源:
RSAOAEPKeyExchangeFormatter.cs
來源:
RSAOAEPKeyExchangeFormatter.cs

從指定的輸入資料建立加密的金鑰交換資料。

public:
 override cli::array <System::Byte> ^ CreateKeyExchange(cli::array <System::Byte> ^ rgbData);
public override byte[] CreateKeyExchange (byte[] rgbData);
override this.CreateKeyExchange : byte[] -> byte[]
Public Overrides Function CreateKeyExchange (rgbData As Byte()) As Byte()

參數

rgbData
Byte[]

要以金鑰交換傳遞的機密資訊。

傳回

Byte[]

要傳送給預定收件者的加密金鑰交換資料。

例外狀況

備註

此數據只能由對應至用來加密數據的公鑰之私鑰的持有者解譯。 這有助於確保只有預期的收件者可以存取秘密資訊。

另請參閱

適用於

CreateKeyExchange(Byte[], Type)

來源:
RSAOAEPKeyExchangeFormatter.cs
來源:
RSAOAEPKeyExchangeFormatter.cs
來源:
RSAOAEPKeyExchangeFormatter.cs

從指定的輸入資料建立加密的金鑰交換資料。

public:
 override cli::array <System::Byte> ^ CreateKeyExchange(cli::array <System::Byte> ^ rgbData, Type ^ symAlgType);
public override byte[] CreateKeyExchange (byte[] rgbData, Type? symAlgType);
public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType);
override this.CreateKeyExchange : byte[] * Type -> byte[]
Public Overrides Function CreateKeyExchange (rgbData As Byte(), symAlgType As Type) As Byte()

參數

rgbData
Byte[]

要以金鑰交換傳遞的機密資訊。

symAlgType
Type

目前版本中未使用這個參數。

傳回

Byte[]

要傳送給預定收件者的加密金鑰交換資料。

範例

下列範例示範如何使用 RSAOAEPKeyExchangeFormatter.CreateKeyExchange 方法來建立郵件收件者的交換密鑰。 此程式代碼範例是針對 類別提供的較大範例的 RSAOAEPKeyExchangeFormatter 一部分

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();
        }
    }
}
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

備註

此數據只能由對應至用來加密數據的公鑰之私鑰的持有者解譯。 這有助於確保只有預期的收件者可以存取秘密資訊。

另請參閱

適用於