Crypto.cs | FileDecrypt

This is the same as FileEncrypt, expect it will decrypt a file and the parameters are a bit different.

            byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
            byte[] salt = new byte[32];

            FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
            fsCrypt.Read(salt, 0, salt.Length);

            RijndaelManaged AES = new RijndaelManaged();
            AES.KeySize = 256;
            AES.BlockSize = 128;
            var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
            AES.Key = key.GetBytes(AES.KeySize / 8);
            AES.IV = key.GetBytes(AES.BlockSize / 8);
            AES.Padding = PaddingMode.PKCS7;
            AES.Mode = CipherMode.CFB;

            CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateDecryptor(), CryptoStreamMode.Read);

            FileStream fsOut = new FileStream(outputFile, FileMode.Create);

            int read;
            byte[] buffer = new byte[1048576];

            try
            {
                while ((read = cs.Read(buffer, 0, buffer.Length)) > 0)
                {
                    Application.DoEvents();
                    fsOut.Write(buffer, 0, read);
                }
            }
            catch (CryptographicException ex_CryptographicException)
            {
                Console.WriteLine("CryptographicException error: " + ex_CryptographicException.Message);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }

            try
            {
                cs.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error by closing CryptoStream: " + ex.Message);
            }
            finally
            {
                fsOut.Close();
                fsCrypt.Close();
            }