ProtectedData.Unprotect Metode

Definisi

Ruang nama:

System.Security.Cryptography

Rakitan:

System.Security.Cryptography.ProtectedData.dll

Overload

Unprotect(Byte[], Byte[], DataProtectionScope)

Mendekripsi data dalam array byte tertentu dan mengembalikan array byte yang berisi data yang didekripsi.

Unprotect(Byte[], Byte[], DataProtectionScope)

Sumber:

ProtectedData.cs

Mendekripsi data dalam array byte tertentu dan mengembalikan array byte yang berisi data yang didekripsi.

public:
 static cli::array <System::Byte> ^ Unprotect(cli::array <System::Byte> ^ encryptedData, cli::array <System::Byte> ^ optionalEntropy, System::Security::Cryptography::DataProtectionScope scope);

public static byte[] Unprotect(byte[] encryptedData, byte[]? optionalEntropy, System.Security.Cryptography.DataProtectionScope scope);

static member Unprotect : byte[] * byte[] * System.Security.Cryptography.DataProtectionScope -> byte[]

Public Shared Function Unprotect (encryptedData As Byte(), optionalEntropy As Byte(), scope As DataProtectionScope) As Byte()

Parameter

encryptedData

Byte[]

Array byte yang berisi data yang dienkripsi menggunakan Protect(Byte[], Byte[], DataProtectionScope) metode .

optionalEntropy

Byte[]

Array byte tambahan opsional yang digunakan untuk mengenkripsi data, atau null jika array byte tambahan tidak digunakan.

scope

DataProtectionScope

Salah satu nilai enumerasi yang menentukan cakupan perlindungan data yang digunakan untuk mengenkripsi data.

Mengembalikan

Byte[]

Array byte yang mewakili data yang didekripsi.

Pengecualian

ArgumentNullException

Parameternya encryptedData adalah null.

CryptographicException

Dekripsi gagal.

NotSupportedException

Sistem operasi tidak mendukung metode ini.

OutOfMemoryException

Kehabisan memori.

PlatformNotSupportedException

Hanya .NET Core dan .NET 5+: Panggilan ke Unprotect metode hanya didukung pada sistem operasi Windows.

Contoh

Contoh kode berikut menunjukkan cara menggunakan perlindungan data.

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

Keterangan

Metode ini dapat digunakan untuk membuka proteksi data yang dienkripsi menggunakan metode .Protect optionalEntropy Jika parameter digunakan selama enkripsi, parameter harus disediakan untuk tidak mendekripsi data.

Catatan

Jika Anda menggunakan metode ini selama peniruan identitas, Anda mungkin menerima kesalahan berikut: "Kunci tidak valid untuk digunakan dalam status yang ditentukan." Untuk mencegah kesalahan ini, muat profil pengguna yang ingin Anda tirukan sebelum memanggil metode .