DataProtectionScope 列舉
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
設定 Protect(Byte[], Byte[], DataProtectionScope) 方法要套用的資料保護範圍。
public enum class DataProtectionScopepublic enum DataProtectionScopetype DataProtectionScope = Public Enum DataProtectionScope- 繼承
欄位
| CurrentUser | 0 | 受保護的資料與目前的使用者有關聯。 只有在目前使用者內容中執行的執行緒，才能夠解除資料的保護。 |
| LocalMachine | 1 | 受保護的資料與機器的內容有關聯。 這台電腦上執行的任何處理序都能夠解除資料的保護。 這個列舉值通常是在伺服器上執行的伺服器特定應用程式中使用，這種狀況不允許不受信任的使用者存取資料。 |
範例
下列程式碼範例示範如何使用資料保護。
#using <System.Security.dll>
using namespace System;
using namespace System::Security::Cryptography;
public ref class DataProtectionSample
{
private:
// Create byte array for additional entropy when using Protect method.
static array<Byte>^s_additionalEntropy = {9,8,7,6,5};
public:
static void Main()
{
// Create a simple byte array containing data to be encrypted.
array<Byte>^secret = {0,1,2,3,4,1,2,3,4};
//Encrypt the data.
array<Byte>^encryptedSecret = Protect( secret );
Console::WriteLine( "The encrypted byte array is:" );
PrintValues( encryptedSecret );
// Decrypt the data and store in a byte array.
array<Byte>^originalData = Unprotect( encryptedSecret );
Console::WriteLine( "{0}The original data is:", Environment::NewLine );
PrintValues( originalData );
}
static array<Byte>^ Protect( array<Byte>^data )
{
try
{
// Encrypt the data using DataProtectionScope.CurrentUser. The result can be decrypted
// only by the same current user.
return ProtectedData::Protect( data, s_additionalEntropy, DataProtectionScope::CurrentUser );
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "Data was not encrypted. An error occurred." );
Console::WriteLine( e );
return nullptr;
}
}
static array<Byte>^ Unprotect( array<Byte>^data )
{
try
{
//Decrypt the data using DataProtectionScope.CurrentUser.
return ProtectedData::Unprotect( data, s_additionalEntropy, DataProtectionScope::CurrentUser );
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "Data was not decrypted. An error occurred." );
Console::WriteLine( e );
return nullptr;
}
}
static void PrintValues( array<Byte>^myArr )
{
System::Collections::IEnumerator^ myEnum = myArr->GetEnumerator();
while ( myEnum->MoveNext() )
{
Byte i = safe_cast<Byte>(myEnum->Current);
Console::Write( "\t{0}", i );
}
Console::WriteLine();
}
};
int main()
{
DataProtectionSample::Main();
}
using System;
using System.Security.Cryptography;
public class DataProtectionSample
{
// Create byte array for additional entropy when using Protect method.
static byte [] s_additionalEntropy = { 9, 8, 7, 6, 5 };
public static void Main()
{
// Create a simple byte array containing data to be encrypted.
byte [] secret = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
//Encrypt the data.
byte [] encryptedSecret = Protect( secret );
Console.WriteLine("The encrypted byte array is:");
PrintValues(encryptedSecret);
// Decrypt the data and store in a byte array.
byte [] originalData = Unprotect( encryptedSecret );
Console.WriteLine("{0}The original data is:", Environment.NewLine);
PrintValues(originalData);
}
public static byte [] Protect( byte [] data )
{
try
{
// Encrypt the data using DataProtectionScope.CurrentUser. The result can be decrypted
// only by the same current user.
return ProtectedData.Protect( data, s_additionalEntropy, DataProtectionScope.CurrentUser );
}
catch (CryptographicException e)
{
Console.WriteLine("Data was not encrypted. An error occurred.");
Console.WriteLine(e.ToString());
return null;
}
}
public static byte [] Unprotect( byte [] data )
{
try
{
//Decrypt the data using DataProtectionScope.CurrentUser.
return ProtectedData.Unprotect( data, s_additionalEntropy, DataProtectionScope.CurrentUser );
}
catch (CryptographicException e)
{
Console.WriteLine("Data was not decrypted. An error occurred.");
Console.WriteLine(e.ToString());
return null;
}
}
public static void PrintValues( Byte[] myArr )
{
foreach ( Byte i in myArr )
{
Console.Write( "\t{0}", i );
}
Console.WriteLine();
}
}
Imports System.Security.Cryptography
Public Class DataProtectionSample
' Create byte array for additional entropy when using Protect method.
Private Shared s_additionalEntropy As Byte() = {9, 8, 7, 6, 5}
Public Shared Sub Main()
' Create a simple byte array containing data to be encrypted.
Dim secret As Byte() = {0, 1, 2, 3, 4, 1, 2, 3, 4}
'Encrypt the data.
Dim encryptedSecret As Byte() = Protect(secret)
Console.WriteLine("The encrypted byte array is:")
PrintValues(encryptedSecret)
' Decrypt the data and store in a byte array.
Dim originalData As Byte() = Unprotect(encryptedSecret)
Console.WriteLine("{0}The original data is:", Environment.NewLine)
PrintValues(originalData)
End Sub
Public Shared Function Protect(ByVal data() As Byte) As Byte()
Try
' Encrypt the data using DataProtectionScope.CurrentUser. The result can be decrypted
' only by the same current user.
Return ProtectedData.Protect(data, s_additionalEntropy, DataProtectionScope.CurrentUser)
Catch e As CryptographicException
Console.WriteLine("Data was not encrypted. An error occurred.")
Console.WriteLine(e.ToString())
Return Nothing
End Try
End Function
Public Shared Function Unprotect(ByVal data() As Byte) As Byte()
Try
'Decrypt the data using DataProtectionScope.CurrentUser.
Return ProtectedData.Unprotect(data, s_additionalEntropy, DataProtectionScope.CurrentUser)
Catch e As CryptographicException
Console.WriteLine("Data was not decrypted. An error occurred.")
Console.WriteLine(e.ToString())
Return Nothing
End Try
End Function
Public Shared Sub PrintValues(ByVal myArr() As [Byte])
Dim i As [Byte]
For Each i In myArr
Console.Write(vbTab + "{0}", i)
Next i
Console.WriteLine()
End Sub
End Class
備註
此列舉會與 和 Unprotect 方法搭配 Protect 使用，以透過加密來保護資料。
謹慎 LocalMachine 列舉值可讓多個帳戶解除保護資料。 只有在您信任電腦上的每個帳戶時，才使用此值。 在大部分情況下，您應該使用 CurrentUser 值。