ProtectedData.Protect(Byte[], Byte[], DataProtectionScope) ProtectedData.Protect(Byte[], Byte[], DataProtectionScope) ProtectedData.Protect(Byte[], Byte[], DataProtectionScope) ProtectedData.Protect(Byte[], Byte[], DataProtectionScope) Method

Definice

Zašifruje data v zadaném bajtovém poli a vrátí pole bajtů obsahující šifrovaná data.Encrypts the data in a specified byte array and returns a byte array that contains the encrypted data.

public:
 static cli::array <System::Byte> ^ Protect(cli::array <System::Byte> ^ userData, cli::array <System::Byte> ^ optionalEntropy, System::Security::Cryptography::DataProtectionScope scope);
public static byte[] Protect (byte[] userData, byte[] optionalEntropy, System.Security.Cryptography.DataProtectionScope scope);
static member Protect : byte[] * byte[] * System.Security.Cryptography.DataProtectionScope -> byte[]
Public Shared Function Protect (userData As Byte(), optionalEntropy As Byte(), scope As DataProtectionScope) As Byte()

Parametry

userData
Byte[]

Bajtové pole obsahující data, která mají být zašifrována.A byte array that contains data to encrypt.

optionalEntropy
Byte[]

Volitelné další bajtové pole, které se používá ke zvýšení složitosti šifrování nebo null žádné další složitosti.An optional additional byte array used to increase the complexity of the encryption, or null for no additional complexity.

scope
DataProtectionScope DataProtectionScope DataProtectionScope DataProtectionScope

Jedna z hodnot výčtu, která určuje rozsah šifrování.One of the enumeration values that specifies the scope of encryption.

Návraty

Byte[]

Pole bajtů představující zašifrovaná data.A byte array representing the encrypted data.

Výjimky

userData Parametr jenull.The userData parameter is null.

Operační systém tuto metodu nepodporuje.The operating system does not support this method.

V systému není při šifrování dat dostatek paměti.The system ran out of memory while encrypting the data.

Jenom .NET Core: Volání metody Protect jsou podporována pouze v operačních systémech Windows..NET Core only: Calls to the Protect method are supported on Windows operating systems only.

Příklady

Následující příklad ukazuje, jak používat ochranu dat.The following example shows how to use data protection.

#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_aditionalEntropy = {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_aditionalEntropy, 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_aditionalEntropy, 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_aditionalEntropy = { 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_aditionalEntropy, 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_aditionalEntropy, 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_aditionalEntropy 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_aditionalEntropy, 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_aditionalEntropy, 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

Poznámky

Tato metoda se dá použít k šifrování dat, jako jsou hesla, klíče nebo připojovací řetězce.This method can be used to encrypt data such as passwords, keys, or connection strings. Tento optionalEntropy parametr umožňuje přidat data, abyste zvýšili složitost šifrování. Určete null bez dalších složitosti.The optionalEntropy parameter enables you to add data to increase the complexity of the encryption; specify null for no additional complexity. Pokud je tato informace k dispozici, je nutné použít také při dešifrování dat pomocí Unprotect metody.If provided, this information must also be used when decrypting the data using the Unprotect method.

Poznámka

Pokud tuto metodu použijete při zosobnění, může se zobrazit následující chyba: Klíč není platný pro použití v zadaném stavu.If you use this method during impersonation, you may receive the following error: "Key not valid for use in specified state." Chcete-li této chybě zabránit, načtěte před voláním metody profil uživatele, kterého chcete zosobnit.To prevent this error, load the profile of the user you want to impersonate before calling the method.

Zabezpečení

DataProtectionPermission
s přiřazeným ProtectData příznakem pro oprávnění k ochraně dat.with the associated ProtectData flag for permission to protect data.

Platí pro