[UWP] Cryptograph App

출처 : https://www.youtube.com/watch?v=2suqdbeNPUM&index=7&list=LLrMY3C2G9ShhFi3y6GCkk1w&t=3s

Library.cs

using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices.WindowsRuntime; using System.Text; using System.Threading.Tasks; using Windows.Security.Cryptography; using Windows.Security.Cryptography.Core; using Windows.Storage; using Windows.Storage.Pickers; using Windows.Storage.Streams; using Windows.UI.Xaml.Controls; namespace UWPCryptograph { class Library { private static byte[] values = {1,4,8,15,16,23,42,108, 1, 4, 8, 15, 16, 23, 42, 108, 1,4,8,15,16,23,42,108,1,4,8,15,16,23,42,108}; private static SymmetricKeyAlgorithmProvider algorithm = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbcPkcs7); private static CryptographicKey key = algorithm.CreateSymmetricKey(CryptographicBuffer.CreateFromByteArray(values)); private static IBuffer iv = values.AsBuffer(); public async void Open(TextBox display) { try { FileOpenPicker picker = new FileOpenPicker(); picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary; picker.FileTypeFilter.Add(".txt"); StorageFile file = await picker.PickSingleFileAsync(); display.Text = await FileIO.ReadTextAsync(file); } catch { } } public async void Save(TextBox display) { try { FileSavePicker picker = new FileSavePicker(); picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary; picker.FileTypeChoices.Add("Plain Text", new List<string>() { ".txt" }); picker.DefaultFileExtension = ".txt"; picker.SuggestedFileName = "Document"; StorageFile file= await picker.PickSaveFileAsync(); if(file!=null) { await FileIO.WriteTextAsync(file, display.Text); } } catch { } } public void Encrypt(TextBox display) { try { IBuffer buffer = CryptographicBuffer.ConvertStringToBinary(display.Text, BinaryStringEncoding.Utf8); IBuffer bufferEncrypt = CryptographicEngine.Encrypt(key, buffer, iv); display.Text = CryptographicBuffer.EncodeToBase64String(bufferEncrypt); } catch { } } public void Decrypt(TextBox display) { try { IBuffer buffer = Convert.FromBase64String(display.Text).AsBuffer(); IBuffer bufferDecrypt = CryptographicEngine.Decrypt(key, buffer, iv); display.Text = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8,bufferDecrypt); } catch { } } } }

MainPage.xaml

<Page x:Class="UWPCryptograph.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:UWPCryptograph" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> <TextBox Name="Display" AcceptsReturn="True" TextWrapping="Wrap" VerticalAlignment="Stretch"/> </Grid> <Page.BottomAppBar> <AppBar IsOpen="True" IsSticky="True"> <StackPanel Orientation="Horizontal"> <AppBarButton Icon="Folder" Name="Open" Label="Open" Click="Open_Click"/> <AppBarButton Icon="Save" Name="Save" Label="Save" Click="Save_Click"/> <AppBarButton Icon="ProtectedDocument" Name="Encrypt" Label="Encrypt" Click="Encrypt_Click"/> <AppBarButton Icon="Document" Name="Decrypt" Label="Decrypt" Click="Decrypt_Click"/> </StackPanel> </AppBar> </Page.BottomAppBar> </Page>

MainPage.xaml.cs

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Runtime.InteropServices.WindowsRuntime; using Windows.Foundation; using Windows.Foundation.Collections; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Controls.Primitives; using Windows.UI.Xaml.Data; using Windows.UI.Xaml.Input; using Windows.UI.Xaml.Media; using Windows.UI.Xaml.Navigation; // 빈 페이지 항목 템플릿은 http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409 에 문서화되어 있습니다. namespace UWPCryptograph { /// <summary> /// 자체적으로 사용하거나 프레임 내에서 탐색할 수 있는 빈 페이지입니다. /// </summary> public sealed partial class MainPage : Page { Library lib = new Library(); public MainPage() { this.InitializeComponent(); } private void Open_Click(object sender, RoutedEventArgs e) { lib.Open(Display); } private void Save_Click(object sender, RoutedEventArgs e) { lib.Save(Display); } private void Encrypt_Click(object sender, RoutedEventArgs e) { lib.Encrypt(Display); } private void Decrypt_Click(object sender, RoutedEventArgs e) { lib.Decrypt(Display); } } }

결과 화면

text 입력

Encrypt

Save File

Open File

Open File -> Decrypt