Io/BSHash/BSHash/Manager/CredentialManager.cs

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

namespace BSHash
{
    public static class CredentialManager
    {
        public static void SaveCredentials(string username, string password)
        {
            try
            {
                var credentials = new UserCredentials { Username = username, Password = password };
                var json = JsonSerializer.Serialize(credentials);
                var encrypted = ProtectData(json);
                
                Properties.Settings.Default.SavedCredentials = encrypted;
                Properties.Settings.Default.Save();
            }
            catch (Exception ex)
            {
                throw new Exception($"Errore nel salvataggio delle credenziali: {ex.Message}");
            }
        }

        public static UserCredentials LoadCredentials()
        {
            try
            {
                var encrypted = Properties.Settings.Default.SavedCredentials;
                if (string.IsNullOrEmpty(encrypted))
                    return null;

                var decrypted = UnprotectData(encrypted);
                return JsonSerializer.Deserialize<UserCredentials>(decrypted);
            }
            catch
            {
                return null;
            }
        }

        public static void ClearCredentials()
        {
            Properties.Settings.Default.SavedCredentials = string.Empty;
            Properties.Settings.Default.Save();
        }

        private static string ProtectData(string data)
        {
            byte[] dataBytes = Encoding.UTF8.GetBytes(data);
            byte[] protectedBytes = ProtectedData.Protect(dataBytes, null, DataProtectionScope.CurrentUser);
            return Convert.ToBase64String(protectedBytes);
        }

        private static string UnprotectData(string protectedData)
        {
            byte[] protectedBytes = Convert.FromBase64String(protectedData);
            byte[] dataBytes = ProtectedData.Unprotect(protectedBytes, null, DataProtectionScope.CurrentUser);
            return Encoding.UTF8.GetString(dataBytes);
        }
    }

    public class UserCredentials
    {
        public string Username { get; set; }
        public string Password { get; set; }
    }
}