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ProtectedMemory.Protect Method

Protects the specified data.

Namespace:  System.Security.Cryptography
Assembly:  System.Security (in System.Security.dll)
public static void Protect(
	byte[] userData,
	MemoryProtectionScope scope
)

Parameters

userData
Type: System.Byte[]

The byte array containing data in memory to protect. The array must be a multiple of 16 bytes.

scope
Type: System.Security.Cryptography.MemoryProtectionScope

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

ExceptionCondition
CryptographicException

userData must be 16 bytes in length or in multiples of 16 bytes.

NotSupportedException

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

ArgumentNullException

userData is null.

This method can be used to protect data in memory. Note that the method does not make a copy of the data, but encrypts the byte array in place. The userData parameter must be 16 bytes in length or a multiple of 16 bytes.

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

The following code 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: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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