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

Définition

Chiffre les données contenues dans un tableau d'octets spécifié et retourne un tableau d'octets contenant les données chiffrées.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()

Paramètres

userData
Byte[]

Tableau d'octets qui contient les données à chiffrer.A byte array that contains data to encrypt.

optionalEntropy
Byte[]

Le tableau d'octets supplémentaire facultatif utilisé pour augmenter la complexité du chiffrement, ou null pour aucune complexité supplémentaire.An optional additional byte array used to increase the complexity of the encryption, or null for no additional complexity.

scope
DataProtectionScope DataProtectionScope DataProtectionScope DataProtectionScope

Une des valeurs d'énumération qui spécifie la portée du chiffrement.One of the enumeration values that specifies the scope of encryption.

Retours

Byte[]

Tableau d'octets représentant les données chiffrées.A byte array representing the encrypted data.

Exceptions

Le paramètre userData a la valeur null.The userData parameter is null.

Le système d'exploitation ne prend pas en charge cette méthode.The operating system does not support this method.

Le système s'est trouvé à court de mémoire pendant le chiffrement des données.The system ran out of memory while encrypting the data.

.NET Core uniquement : Les appels à la méthode Protect sont pris en charge uniquement sur les systèmes d’exploitation Windows..NET Core only: Calls to the Protect method are supported on Windows operating systems only.

Exemples

L’exemple suivant montre comment utiliser la protection des données.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

Remarques

Cette méthode peut être utilisée pour chiffrer des données telles que des mots de passe, des clés ou des chaînes de connexion.This method can be used to encrypt data such as passwords, keys, or connection strings. Le optionalEntropy paramètre vous permet d’ajouter des données pour augmenter la complexité du chiffrement; null spécifiez pour aucune complexité supplémentaire.The optionalEntropy parameter enables you to add data to increase the complexity of the encryption; specify null for no additional complexity. Si ces informations sont fournies, elles doivent également être utilisées lors du déchiffrement Unprotect des données à l’aide de la méthode.If provided, this information must also be used when decrypting the data using the Unprotect method.

Notes

Si vous utilisez cette méthode lors de l’emprunt d’identité, vous pouvez recevoir l’erreur suivante: «La clé n’est pas valide pour une utilisation dans l’état spécifié.»If you use this method during impersonation, you may receive the following error: "Key not valid for use in specified state." Pour éviter cette erreur, chargez le profil de l’utilisateur dont vous souhaitez emprunter l’identité avant d’appeler la méthode.To prevent this error, load the profile of the user you want to impersonate before calling the method.

Sécurité

DataProtectionPermission
avec l’indicateur ProtectData associé pour l’autorisation de protection des données.with the associated ProtectData flag for permission to protect data.

S’applique à