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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Runtime.InteropServices;
using Microsoft.AspNetCore.Cryptography;
namespace Microsoft.AspNetCore.DataProtection;
/// <summary>
/// Wrappers around CryptProtectMemory / CryptUnprotectMemory.
/// </summary>
internal static unsafe class MemoryProtection
{
// from dpapi.h
private const uint CRYPTPROTECTMEMORY_SAME_PROCESS = 0x00;
public static void CryptProtectMemory(SafeHandle pBuffer, uint byteCount)
{
if (!UnsafeNativeMethods.CryptProtectMemory(pBuffer, byteCount, CRYPTPROTECTMEMORY_SAME_PROCESS))
{
UnsafeNativeMethods.ThrowExceptionForLastCrypt32Error();
}
}
public static void CryptUnprotectMemory(byte* pBuffer, uint byteCount)
{
if (!UnsafeNativeMethods.CryptUnprotectMemory(pBuffer, byteCount, CRYPTPROTECTMEMORY_SAME_PROCESS))
{
UnsafeNativeMethods.ThrowExceptionForLastCrypt32Error();
}
}
public static void CryptUnprotectMemory(SafeHandle pBuffer, uint byteCount)
{
if (!UnsafeNativeMethods.CryptUnprotectMemory(pBuffer, byteCount, CRYPTPROTECTMEMORY_SAME_PROCESS))
{
UnsafeNativeMethods.ThrowExceptionForLastCrypt32Error();
}
}
}
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