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ProtectedMemory.Unprotect Method

Unprotects data in memory that was protected using the Protect method.

Namespace:  System.Security.Cryptography
Assembly:  System.Security (in System.Security.dll)

public static void Unprotect(
	byte[] encryptedData,
	MemoryProtectionScope scope
)

Parameters

encryptedData
Type: System.Byte[]

The byte array in memory to unencrypt.

scope
Type: System.Security.Cryptography.MemoryProtectionScope

One of the enumeration values that specifies the scope of memory protection.

ExceptionCondition
NotSupportedException

The operating system does not support this method. This method can be used only with the Windows 2000 or later operating systems.

ArgumentNullException

encryptedData is null.

CryptographicException

encryptedData is empty.

-or-

This call was not implemented.

-or-

NTSTATUS contains an error.

This method can be used to unencrypt data in memory that was encrypted using the Protect method.

Support for this method is available in the Windows XP and later operating systems.

The following example shows how to use data protection.

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 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 );
	}

}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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