ProtectedMemory.Unprotect(Byte[], MemoryProtectionScope) 方法

定义

命名空间:

System.Security.Cryptography

程序集:

System.Security.dll

取消对使用 Protect(Byte[], MemoryProtectionScope) 方法保护的内存中的数据的保护。

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

public static void Unprotect (byte[] encryptedData, System.Security.Cryptography.MemoryProtectionScope scope);

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

Public Shared Sub Unprotect (encryptedData As Byte(), scope As MemoryProtectionScope)

参数

encryptedData

Byte[]

要解密的内存中的字节数组。

scope

MemoryProtectionScope

指定内存保护范围的枚举值之一。

例外

NotSupportedException

该操作系统不支持此方法。 此方法仅可用于 Windows 2000 或更高版本的操作系统。

ArgumentNullException

encryptedData 为 null。

CryptographicException

encryptedData 为空。

- 或 -

未实现此调用。

- 或 -

NTSTATUS 包含错误。

示例

以下示例演示如何使用数据保护。

#using <System.Security.dll>

using namespace System;
using namespace System::Security::Cryptography;

int main()
{
   
   // Create the original data to be encrypted (The data length should be a multiple of 16).
   array<Byte>^secret = {1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4};
   
   // Encrypt the data in memory. The result is stored in the same array as the original data.
   ProtectedMemory::Protect( secret, MemoryProtectionScope::SameLogon );
   
   // Decrypt the data in memory and store in the original array.
   ProtectedMemory::Unprotect( secret, MemoryProtectionScope::SameLogon );
}

using System;
using System.Security.Cryptography;

public class MemoryProtectionSample
{

    public static void Main()
    {
        // Create the original data to be encrypted (The data length should be a multiple of 16).
        byte [] secret = { 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4 };

        // Encrypt the data in memory. The result is stored in the same array as the original data.
        ProtectedMemory.Protect( secret, MemoryProtectionScope.SameLogon );

        // Decrypt the data in memory and store in the original array.
        ProtectedMemory.Unprotect( secret, MemoryProtectionScope.SameLogon );
    }
}

Imports System.Security.Cryptography

Public Class MemoryProtectionSample

    Public Shared Sub Main()
        ' Create the original data to be encrypted (The data length should be a multiple of 16).
        Dim secret As Byte() = {1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4}

        ' Encrypt the data in memory. The result is stored in the same array as the original data.
        ProtectedMemory.Protect(secret, MemoryProtectionScope.SameLogon)

        ' Decrypt the data in memory and store in the original array.
        ProtectedMemory.Unprotect(secret, MemoryProtectionScope.SameLogon)

    End Sub
End Class

注解

此方法可用于取消加密使用 Protect 方法加密的内存中的数据。

Windows XP 和更高版本的操作系统中提供了对此方法的支持。