PalacePal/Pal.Client/Configuration/ConfigurationData.cs

using System;
using System.Linq;
using System.Security.Cryptography;
using Microsoft.Extensions.Logging;

namespace Pal.Client.Configuration;

internal static class ConfigurationData
{
    private static readonly ILogger _logger =
        DependencyInjectionContext.LoggerProvider.CreateLogger(typeof(ConfigurationData));

    [Obsolete("for V1 import")]
    internal static readonly byte[] FixedV1Entropy = { 0x22, 0x4b, 0xe7, 0x21, 0x44, 0x83, 0x69, 0x55, 0x80, 0x38 };

    public const string ConfigFileName = "palace-pal.config.json";

    private static bool? _supportsDpapi;
    public static bool SupportsDpapi
    {
        get
        {
            if (_supportsDpapi == null)
            {
                try
                {
                    byte[] input = RandomNumberGenerator.GetBytes(32);
                    byte[] entropy = RandomNumberGenerator.GetBytes(16);
                    byte[] temp = ProtectedData.Protect(input, entropy, DataProtectionScope.CurrentUser);
                    byte[] output = ProtectedData.Unprotect(temp, entropy, DataProtectionScope.CurrentUser);
                    _supportsDpapi = input.SequenceEqual(output);
                }
                catch (Exception)
                {
                    _supportsDpapi = false;
                }

                _logger.LogTrace("DPAPI support: {Supported}", _supportsDpapi);
            }
            return _supportsDpapi.Value;
        }
    }
}