private async void UploadImage()
{
if (_imagePreview == null)
{
await App.Current.MainPage.DisplayAlert("Error", "You haven't picked an image yet", "Ok");
}
else
{
try
{
//start actiity indicator
ActivityIndicator = true;
//disable buttons
BtnUploadImage = false;
BtnPickImage = false;
string galleryPath = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).AbsolutePath;
string outputPath = Path.Combine(galleryPath + "/Vault", Path.GetFileName(_file.Path) + ".aes");
FileEncrypt(_file.Path);
var user = await FirebaseHelper.GetUser(_email);
FileStream filestream = System.IO.File.OpenRead(outputPath);
await FirebaseHelper.UploadImage(filestream, Path.GetFileName(_file.Path), user.UserID);
var downloadurl = await FirebaseHelper.GetImage(Path.GetFileName(_file.Path), user.UserID);
await FirebaseHelper.UploadImageURL(Path.GetFileName(_file.Path), downloadurl.ToString(), user.UserID);
//delete encrypted file we create on device
if (File.Exists(outputPath))
{
File.Delete(outputPath);
}
//stop activity indicator
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Success", "Image has been uploaded", "OK");
ImagePreview = "";
//re-enable PickImage button
BtnPickImage = true;
}
catch
{
await App.Current.MainPage.DisplayAlert("Error", "Error in uploading image, please try again", "Ok");
ImagePreview = "";
ActivityIndicator = false;
BtnPickImage = true;
BtnUploadImage = false;
}
}
}
private async void Login()
{
ActivityIndicator = true;
//check if email or password fields are null or empty
if (string.IsNullOrEmpty(Email) || string.IsNullOrEmpty(Password))
{
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Empty Fields", "Email and Password field cannot be empty", "OK");
}
else
{
//call GetUser function from FirebaseHelper class
var user = await FirebaseHelper.GetUser(Email);
if (user != null)
{
//get stored hashed password
byte[] hashBytes = Convert.FromBase64String(user.Password);
//hash entered password
byte[] salt = new byte[16];
Array.Copy(hashBytes, 0, salt, 0, 16);
var pbkdf2 = new Rfc2898DeriveBytes(Password, salt, 10000);
byte[] hash = pbkdf2.GetBytes(20);
//compare entered password to stored password
bool passwordMatches = true;
for (int i = 0; i < 20; i++)
{
if (hashBytes[i + 16] != hash[i])
{
passwordMatches = false;
}
}
if (Email == user.Email && passwordMatches == true)
{
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Login Successful", "Welcome to your Vault " + user.FirstName, "Ok");
//set welcome page as new navigation page instead of navigating to it so user can't press back button to come back to login page
App.Current.MainPage = new NavigationPage(new WelcomePage(Email));
}
else
{
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Login Failed", "Please enter correct password", "OK");
}
}
else
{
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Login Failed", "Please enter correct email address", "OK");
}
}
}
private async void FileEncrypt(string inputFile)
{
try
{
string galleryPath = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).AbsolutePath;
string outputPath = Path.Combine(galleryPath + "/Vault", Path.GetFileName(_file.Path) + ".aes");
var user = await FirebaseHelper.GetUser(_email);
FileStream fsCrypt = new FileStream(outputPath, FileMode.Create);
//Set Rijndael symmetric encryption algorithm
RijndaelManaged AES = new RijndaelManaged();
AES.KeySize = 256;
AES.BlockSize = 128;
AES.Padding = PaddingMode.PKCS7;
var key = new Rfc2898DeriveBytes(user.Key, user.Salt, 50000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CFB;
// write salt to the begining of the output file
fsCrypt.Write(user.Salt, 0, user.Salt.Length);
CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write);
FileStream fsIn = new FileStream(inputFile, FileMode.Open);
//create a buffer (1mb) so only this amount will allocate in the memory and not the whole file
//1048576 is 1MB in binary
byte[] buffer = new byte[1048576];
int read;
try
{
while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
{
cs.Write(buffer, 0, read);
}
fsIn.Close();
}
catch (Exception ex)
{
await App.Current.MainPage.DisplayAlert("Encryption Error", "Please try again", "Ok");
}
finally
{
cs.Close();
fsCrypt.Close();
}
}
catch
{
await App.Current.MainPage.DisplayAlert("Encryption Failed", "Error uploading image, please try again", "Ok");
}
}
private async void Submit()
{
var user = await FirebaseHelper.GetUser(_email);
if (!(string.IsNullOrEmpty(_password) | string.IsNullOrEmpty(_passwordConfirmation)))
{
if (_password == _passwordConfirmation)
{
bool PasswordValid = IsValidPassword(_password);
if (PasswordValid == true)
{
string hashedPassword = string.Empty;
hashedPassword = HashPassword(_password);
try
{
await FirebaseHelper.UpdateUser(user.UserID, user.FirstName, user.Surname, user.Email, hashedPassword, user.Key, user.Salt);
await App.Current.MainPage.DisplayAlert("Success", "Password has been changed", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
catch (Exception e)
{
await App.Current.MainPage.DisplayAlert("Error", "Password change failed, please try again", "Ok");
}
}
else
{
await App.Current.MainPage.DisplayAlert("Invalid Password", "Please enter a password in line with requirements", "OK");
}
}
else
{
await App.Current.MainPage.DisplayAlert("Error", "Passwords must match", "Ok");
}
}
else
{
await App.Current.MainPage.DisplayAlert("Empty Values", "Fields should not be empty", "Ok");
}
}
private async void FileEncrypt(string inputFile)
{
try
{
string galleryPath = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryMovies).AbsolutePath;
string outputPath = Path.Combine(galleryPath + "/Vault", Path.GetFileName(_file.Path) + ".aes");
var user = await FirebaseHelper.GetUser(_email);
FileStream fsCrypt = new FileStream(outputPath, FileMode.Create);
//Set Rijndael symmetric encryption algorithm
RijndaelManaged AES = new RijndaelManaged();
AES.KeySize = 128;//set to 128 bit for videos to make faster
AES.BlockSize = 128;
AES.Padding = PaddingMode.PKCS7;
var key = new Rfc2898DeriveBytes(user.Key, user.Salt, 50000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CFB;
// write salt to the begining of the output file
fsCrypt.Write(user.Salt, 0, user.Salt.Length);
CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write);
FileStream fsIn = new FileStream(inputFile, FileMode.Open);
//create a buffer (1mb) so only this amount will allocate in the memory and not the whole file
//1048576 is 1MB in binary
byte[] buffer = new byte[1048576];
int read;
try
{
while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
{
cs.Write(buffer, 0, read);
}
fsIn.Close();
}
catch (Exception ex)
{
await App.Current.MainPage.DisplayAlert("Encryption Error", " Please try again", "Ok");
}
finally
{
cs.Close();
fsCrypt.Close();
}
}
catch (Exception e)
{
await App.Current.MainPage.DisplayAlert("Encryption Failed", "Please try again", "Ok");
}
string galleryPath1 = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryMovies).AbsolutePath;
string outputPath1 = Path.Combine(galleryPath1 + "/Vault", Path.GetFileName(_file.Path) + ".aes");
var user1 = await FirebaseHelper.GetUser(_email);
FileStream filestream = File.OpenRead(outputPath1);
await FirebaseHelper.UploadVideo(filestream, Path.GetFileName(_file.Path), user1.UserID);
var downloadurl = await FirebaseHelper.GetVideo(Path.GetFileName(_file.Path), user1.UserID);
await FirebaseHelper.UploadVideoURL(Path.GetFileName(_file.Path), downloadurl.ToString(), user1.UserID);
//delete encrypted file we create on device
if (File.Exists(outputPath1))
{
File.Delete(outputPath1);
}
//stop activity indicator
ActivityIndicator = false;
await App.Current.MainPage.DisplayAlert("Upload Success", "Video has been uploaded", "OK");
Source = string.Empty;
//re-enable PickImage button
BtnPickVideo = true;
}
private async void Submit()
{
if (string.IsNullOrEmpty(_email) || string.IsNullOrEmpty(_emailConfirmation))
{
await App.Current.MainPage.DisplayAlert("Empty values error", "Both Email and Email Confirmation must not be empty", "Ok");
}
else
{
if (_email != _emailConfirmation)
{
await App.Current.MainPage.DisplayAlert("Matching values error", "Both Email and Email Confirmation must match", "Ok");
}
else
{
var user = await FirebaseHelper.GetUser(_email);
if (user == null)
{
await App.Current.MainPage.DisplayAlert("Email address not found", "Please ensure you have provided the correct email address used with your account", "Ok");
}
else
{
//reset users password to random password
try
{
string password = "******";
string hashedPassword = string.Empty;
hashedPassword = HashPassword(password);
await FirebaseHelper.UpdateUser(user.UserID, user.FirstName, user.Surname, user.Email, hashedPassword, user.Key, user.Salt);
}
catch
{
await App.Current.MainPage.DisplayAlert("Password reset error", "Failed to reset password, please try again", "Ok");
}
//send user an email telling them new password and advise to reset it straight away after logging in
try
{
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("*****@*****.**");
mail.To.Add(user.Email);
mail.Subject = "Your Temporary Vault Password";
mail.Body = "Dear " + user.FirstName + ", \n Your new temporary password is Cherry123. Please login with your email and this temporary password and change your password immediately after logging in. \n Kind Regards \n Vault Management Team";
SmtpServer.Port = 587;
SmtpServer.Host = "smtp.gmail.com";
SmtpServer.EnableSsl = true;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("", "");//insert creds when want to use
SmtpServer.Send(mail);
await App.Current.MainPage.DisplayAlert("Password reset success", "Please check your email inbox or junk folder for the email sent out to you", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
catch
{
await App.Current.MainPage.DisplayAlert("Email sending error", "Failed to send email, please try again", "Ok");
}
}
}
}
}
private async void SetupListViewItems()
{
User user = await FirebaseHelper.GetUser(_email);
ImagesList = await FirebaseHelper.GetUsersImageObjects(user.UserID);
}
private async void FileDecrypt(string inputFile, string outputFile)
{
try
{
var user = await FirebaseHelper.GetUser(_email);
FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
fsCrypt.Read(user.Salt, 0, user.Salt.Length);
RijndaelManaged AES = new RijndaelManaged();
AES.KeySize = 128;
AES.BlockSize = 128;
AES.Padding = PaddingMode.PKCS7;
var key = new Rfc2898DeriveBytes(user.Key, user.Salt, 50000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
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)
{
fsOut.Write(buffer, 0, read);
}
}
catch (CryptographicException ex_CryptographicException)
{
await App.Current.MainPage.DisplayAlert("Error", "Decryption error, please try again", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
catch (Exception ex)
{
await App.Current.MainPage.DisplayAlert("Error", "Decryption error, please try again", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
try
{
cs.Close();
}
catch (Exception ex)
{
await App.Current.MainPage.DisplayAlert("Error", "Decryption error, please try again", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
finally
{
fsOut.Close();
fsCrypt.Close();
}
//to show videos in users gallery
MediaScannerConnection.ScanFile(Android.App.Application.Context, new string[] { outputFile }, new string[] { "video / mp4", "video/ mp3" }, null);
//display video in video preview
Source = outputFile;
//delete encrypted file we downloaded before
if (File.Exists(inputFile))
{
File.Delete(inputFile);
}
ActivityIndicator = false;
BtnDownload = true;
BtnDelete = true;
}
catch
{
await App.Current.MainPage.DisplayAlert("Decryption Error", "Please try again", "Ok");
await App.Current.MainPage.Navigation.PopAsync();
}
}