RSAPKCS1KeyExchangeDeformatter.DecryptKeyExchange(Byte[]) 方法
定义
重要
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从加密的密钥交换数据中提取机密信息。
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()参数
- rgbIn
- Byte[]
其中隐藏了机密信息的密钥交换数据。
返回
Byte[]
从密钥交换数据派生的机密信息。
例外
示例
以下示例演示如何使用 DecryptKeyExchange 方法重新创建来自邮件发件人的交换密钥。 此代码示例是为 RSAPKCS1KeyExchangeDeformatter 类提供的一个更大示例的一部分。
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
注解
在调用此方法之前，必须指定一个键。
