using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}using System;

using System.Security.Cryptography;

using System.Text;

​

public class AesDecryption

{

    public static string Decrypt(string cipherTextBase64, string keyBase64, string ivBase64)

    {

        try

        {

            // Decodificar o texto criptografado e chave/IV em base64 para bytes

            byte[] cipherText = Convert.FromBase64String(cipherTextBase64);

            byte[] key = Convert.FromBase64String(keyBase64);

            byte[] iv = Convert.FromBase64String(ivBase64);

​

            // Usar AES com chave de 256 bits e IV adequado

            using (Aes aesAlg = Aes.Create())

            {

                aesAlg.Key = key;

                aesAlg.IV = iv;

                aesAlg.Mode = CipherMode.CBC;

                aesAlg.Padding = PaddingMode.PKCS7;

​

                using (ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV))

                {

                    // Descriptografar os dados

                    byte[] decryptedBytes = decryptor.TransformFinalBlock(cipherText, 0, cipherText.Length);

                    return Encoding.UTF8.GetString(decryptedBytes);

                }

            }

        }

        catch (Exception ex)

        {

            Console.WriteLine("Erro ao descriptografar: " + ex.Message);

            return null;

        }

    }

​

    public static void Main()

    {

        // O texto criptografado fornecido em base64

        string cipherTextBase64 = "JJelAvdVdFcFBFUitHTFdZaWxpR3Z6U21DcG5rYSs4WHlRQ29hMUNHdWlLb3A1VUZjRGNFS2dpVFNGYkh0WVBZRlFwVGRKdTFIV1Y2UUt4cy9RN3Y1dURUdjM4WjREZ2ZxdURjMWZBcWFSQ2VFeTdPbmtYV0VCSTlEZ2NTeVluaktnRkhpaitEbTJtelVLZXFLalN0V0xWL2lPWllvL1lXMWwrRlBSMWhnRDE5emlZWk1mYTRkQT0iLCJtYWMiOiIxMmNiNjA4M2YxZGZhOTY5YjgwZjdlNDhhZDU0ZTBhNGE3YjM4NzMxMTU5OWUyNDhhMDVjNzQwYzA0OGQ4ODQzIn0=";

        // Chave (key) e IV (vetor de inicialização) em base64

        string keyBase64 = "<SUA_CHAVE_EM_BASE64>";

        string ivBase64 = "<SEU_IV_EM_BASE64>";

​

        string decryptedText = Decrypt(cipherTextBase64, keyBase64, ivBase64);

        Console.WriteLine("Texto Descriptografado: " + decryptedText);

    }

}

​