using System.Security.Cryptography;
using System.Text;

namespace Asistencia.Helpers;

public static class CryptoHelper
{
    private static readonly byte[] Key = Encoding.UTF8.GetBytes("S4M_Pru3b4_2024!");
    private static readonly byte[] IV = new byte[16];

    public static string Encriptar(string texto)
    {
        using var aes = Aes.Create();
        aes.Key = Key;
        aes.IV = IV;
        aes.Mode = CipherMode.CBC;
        aes.Padding = PaddingMode.PKCS7;

        using var encryptor = aes.CreateEncryptor();
        using var ms = new MemoryStream();
        using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
        using (var writer = new StreamWriter(cs))
        {
            writer.Write(texto);
        }
        return Convert.ToBase64String(ms.ToArray());
    }

    public static string Desencriptar(string textoEncriptado)
    {
        using var aes = Aes.Create();
        aes.Key = Key;
        aes.IV = IV;
        aes.Mode = CipherMode.CBC;
        aes.Padding = PaddingMode.PKCS7;

        var buffer = Convert.FromBase64String(textoEncriptado);
        using var decryptor = aes.CreateDecryptor();
        using var ms = new MemoryStream(buffer);
        using var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
        using var reader = new StreamReader(cs);
        return reader.ReadToEnd();
    }
}