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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
)
public static void Unprotect (
	byte[] encryptedData, 
	MemoryProtectionScope scope
)
public static function Unprotect (
	encryptedData : byte[], 
	scope : MemoryProtectionScope
)
Not applicable.

Parameters

encryptedData

The byte array in memory to unencrypt.

scope

One of the MemoryProtectionScope values.

Exception typeCondition

PlatformNotSupportedException

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

ArgumentNullException

encryptedData is a null reference (Nothing in Visual Basic).

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 Microsoft 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
{
// Create aditional entropy for use with the Protect method.
	static byte [] s_aditionalEntropy = { 9, 8, 7, 6, 5 };

	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 );
	}

}

import System.*;
import System.Security.Cryptography.*;

public class MemoryProtectionSample
{
    // Create aditional entropy for use with the Protect method.
    private static ubyte sAditionalEntropy[] =  { 9, 8, 7, 6, 5 };

    public static void main(String args[])
    {
        // Create the original data to be encrypted (The data length should 
        // be a multiple of 16).
        ubyte 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);
    } //main
} //MemoryProtectionSample 

Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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