/// <summary>
/// Determines if any authentication has been stored in a file by checking for any base64 information
/// </summary>
/// <returns></returns>
internal static bool IsAuthenticatedFile()
{
var encryptedJsonString = SteganographyExtensions.GetString(
new Bitmap(Image.FromFile(ImageFilePath)));
return(encryptedJsonString.IsBase64String());
}
/// <summary>
/// Saves the authentications into the specified file
/// </summary>
/// <param name="authenticationModels"></param>
internal static void Save(BindingList <AuthenticationModel> authenticationModels)
{
var encryptedJsonString = CipherExtensions.EncryptString(JsonConvert.SerializeObject(authenticationModels), _authenticationKey);
Bitmap bitmap;
using (var stream = new FileStream(ImageFilePath, FileMode.Open, FileAccess.Read))
{
bitmap = SteganographyExtensions.CreateNonIndexedImage(Image.FromStream(stream));
}
var encryptedImage = SteganographyExtensions.SaveString(encryptedJsonString, bitmap);
encryptedImage.Save(ImageFilePath);
}
/// <summary>
/// Loads the authentication from a file
/// </summary>
/// <returns></returns>
internal static BindingList <AuthenticationModel> Load()
{
var authenticationModels = new BindingList <AuthenticationModel>();
if (!IsAuthenticatedFile())
{
return(authenticationModels);
}
Bitmap bitmap;
using (var stream = new FileStream(ImageFilePath, FileMode.Open, FileAccess.Read))
{
bitmap = SteganographyExtensions.CreateNonIndexedImage(Image.FromStream(stream));
}
var encryptedJsonString = SteganographyExtensions.GetString(new Bitmap(bitmap));
var decryptedJsonString = CipherExtensions.DecryptString(encryptedJsonString, _authenticationKey);
authenticationModels = JsonConvert.DeserializeObject <BindingList <AuthenticationModel> >(decryptedJsonString);
return(authenticationModels);
}
