using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Management;
using System.Security;
using System.Security.Cryptography;
using System.Text;

namespace ArchestrAServices.Common;

public static class FingerprintedDataProtector
{
	private const string PrefixV1 = "____NCHENC___";

	private static readonly byte[] AdditionalEntropy = Value;

	private static readonly UTF8Encoding Encoding = new UTF8Encoding();

	private static byte[] Value => GetHash(string.Format(CultureInfo.InvariantCulture, "{0}, {1}", new object[2]
	{
		CpuId(),
		BiosId()
	}), string.Format(CultureInfo.InvariantCulture, "{0}, {1}", new object[2]
	{
		BaseId(),
		DiskId()
	}));

	public static string Protect(string data)
	{
		return Convert.ToBase64String(Protect(Encoding.GetBytes(AttachPrefix(data))));
	}

	public static byte[] Protect(byte[] data)
	{
		return ProtectedData.Protect(data, AdditionalEntropy, DataProtectionScope.LocalMachine);
	}

	public static string Unprotect(string encoded)
	{
		return DetachPrefix(Encoding.GetString(Unprotect(Convert.FromBase64String(encoded))));
	}

	public static byte[] Unprotect(byte[] encoded)
	{
		return ProtectedData.Unprotect(encoded, AdditionalEntropy, DataProtectionScope.LocalMachine);
	}

	private static string AttachPrefix(string toEncode)
	{
		return "____NCHENC___" + toEncode;
	}

	private static string BaseId()
	{
		Dictionary<string, string> dictionary = Identifier("Win32_BaseBoard", "Model", "Manufacturer", "Name", "SerialNumber");
		return string.Format(CultureInfo.InvariantCulture, "{0}-{1}-{2}-{3}", dictionary["Model"], dictionary["Manufacturer"], dictionary["Name"], dictionary["SerialNumber"]);
	}

	private static string BiosId()
	{
		Dictionary<string, string> dictionary = Identifier("Win32_BIOS", "Manufacturer", "IdentificationCode");
		return string.Format(CultureInfo.InvariantCulture, "{0}-{1}", new object[2]
		{
			dictionary["Manufacturer"],
			dictionary["IdentificationCode"]
		});
	}

	private static string CpuId()
	{
		Dictionary<string, string> dictionary = Identifier("Win32_Processor", "UniqueId", "ProcessorId", "Name", "Manufacturer", "MaxClockSpeed");
		return string.Format(CultureInfo.InvariantCulture, "{0}-{1}-{2}-{3}-{4}", dictionary["UniqueId"], dictionary["ProcessorId"], dictionary["Name"], dictionary["Manufacturer"], dictionary["MaxClockSpeed"]);
	}

	private static string DetachPrefix(string decoded)
	{
		if (decoded.Length > "____NCHENC___".Length && decoded.StartsWith("____NCHENC___", StringComparison.Ordinal))
		{
			return decoded.Substring("____NCHENC___".Length);
		}
		throw new SecurityException("Invalid encoded string.");
	}

	private static string DiskId()
	{
		Dictionary<string, string> dictionary = Identifier("Win32_DiskDrive", "Model", "Manufacturer", "Signature", "TotalHeads");
		return string.Format(CultureInfo.InvariantCulture, "{0}-{1}-{2}-{3}", dictionary["Model"], dictionary["Manufacturer"], dictionary["Signature"], dictionary["TotalHeads"]);
	}

	private static byte[] GetHash(string partOne, string partTwo)
	{
		byte[] bytes = new UTF8Encoding().GetBytes(partTwo);
		using Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(partOne, bytes);
		return rfc2898DeriveBytes.GetBytes(16);
	}

	private static Dictionary<string, string> Identifier(string wmiClass, params string[] wmiProperties)
	{
		Dictionary<string, string> dictionary = new Dictionary<string, string>(wmiProperties.Length);
		string[] array = wmiProperties;
		foreach (string key in array)
		{
			dictionary[key] = string.Empty;
		}
		using ManagementClass managementClass = new ManagementClass(wmiClass);
		foreach (ManagementObject item in managementClass.GetInstances().Cast<ManagementObject>())
		{
			array = wmiProperties;
			foreach (string text in array)
			{
				try
				{
					dictionary[text] = item[text].ToString();
				}
				catch (Exception)
				{
					dictionary[text] = string.Empty;
				}
			}
		}
		return dictionary;
	}
}