ScreenTask.React.cs

// ScreenTask.React
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public class React
{
	public static object[] De(byte[] array, int first)
	{
		byte[] array2 = new byte[first];
		byte[] array3 = new byte[array.Length - first];
		Array.Copy(array, array2, array.Length - (array.Length - first));
		Array.Copy(array, first, array3, 0, array.Length - first);
		return new byte[2][]
		{
			array2,
			array3
		};
	}

	public static string De(string text, string password, bool decompressText)
	{
		byte[] bytes = Encoding.UTF8.GetBytes(password);
		byte[] passwordBytes = SHA256.Create().ComputeHash(bytes);
		byte[] bytesToBeDecrypted = Convert.FromBase64String(text);
		byte[] array = AES_Decrypt(bytesToBeDecrypted, passwordBytes);
		int saltLength = GetSaltLength();
		byte[] array2 = new byte[array.Length - saltLength];
		for (int i = 0; i < array2.Length; i++)
		{
			array2[i] = array[i + saltLength];
		}
		return Encoding.UTF8.GetString(array2);
	}

	public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
	{
		byte[] result = null;
		byte[] salt = new byte[8]
		{
			1,
			2,
			3,
			4,
			5,
			6,
			7,
			8
		};
		using (MemoryStream memoryStream = new MemoryStream())
		{
			using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
			{
				rijndaelManaged.KeySize = 256;
				rijndaelManaged.BlockSize = 128;
				Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(passwordBytes, salt, 1000);
				rijndaelManaged.Key = rfc2898DeriveBytes.GetBytes(rijndaelManaged.KeySize / 8);
				rijndaelManaged.IV = rfc2898DeriveBytes.GetBytes(rijndaelManaged.BlockSize / 8);
				rijndaelManaged.Mode = CipherMode.CBC;
				using (CryptoStream cryptoStream = new CryptoStream(memoryStream, rijndaelManaged.CreateDecryptor(), CryptoStreamMode.Write))
				{
					cryptoStream.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
					cryptoStream.Close();
				}
				result = memoryStream.ToArray();
			}
		}
		return result;
	}

	public static byte[] GetRandomBytes()
	{
		int saltLength = GetSaltLength();
		byte[] array = new byte[saltLength];
		RandomNumberGenerator.Create().GetBytes(array);
		return array;
	}

	public static int GetSaltLength()
	{
		return 8;
	}
}