865890 - How to encrypt a PDF using PDF library and load them in PdfViewer?

EncryptingPDF/EncryptingPDF.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35506.116 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EncryptingPDF", "EncryptingPDF\EncryptingPDF.csproj", "{0256B037-C638-425B-B5C6-64BECDA77461}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0256B037-C638-425B-B5C6-64BECDA77461}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

EncryptingPDF/EncryptingPDF/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:EncryptingPDF"
+             x:Class="EncryptingPDF.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

EncryptingPDF/EncryptingPDF/App.xaml.cs

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+namespace EncryptingPDF
+{
+    public partial class App : Application
+    {
+        public App()
+        {
+            Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("Add license key");
+            InitializeComponent();
+
+            MainPage = new AppShell();
+        }
+    }
+}

EncryptingPDF/EncryptingPDF/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="EncryptingPDF.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:EncryptingPDF"
+    Shell.FlyoutBehavior="Disabled"
+    Title="EncryptingPDF">
+
+    <ShellContent
+        Title="Home"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>

EncryptingPDF/EncryptingPDF/AppShell.xaml.cs

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+namespace EncryptingPDF
+{
+    public partial class AppShell : Shell
+    {
+        public AppShell()
+        {
+            InitializeComponent();
+        }
+    }
+}

EncryptingPDF/EncryptingPDF/EncryptingPDF.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
+		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks>
+		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
+		<!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->
+
+		<!-- Note for MacCatalyst:
+		The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
+		When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
+		The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
+		either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
+		<!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
+
+		<OutputType>Exe</OutputType>
+		<RootNamespace>EncryptingPDF</RootNamespace>
+		<UseMaui>true</UseMaui>
+		<SingleProject>true</SingleProject>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+
+		<!-- Display name -->
+		<ApplicationTitle>EncryptingPDF</ApplicationTitle>
+
+		<!-- App Identifier -->
+		<ApplicationId>com.companyname.encryptingpdf</ApplicationId>
+
+		<!-- Versions -->
+		<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
+		<ApplicationVersion>1</ApplicationVersion>
+
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
+		<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<!-- App Icon -->
+		<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
+
+		<!-- Splash Screen -->
+		<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
+
+		<!-- Images -->
+		<MauiImage Include="Resources\Images\*" />
+		<MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />
+
+		<!-- Custom Fonts -->
+		<MauiFont Include="Resources\Fonts\*" />
+
+		<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
+		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <None Remove="Assets\PDF_Succinctly.pdf" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <EmbeddedResource Include="Assets\PDF_Succinctly.pdf" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
+		<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
+		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.1" />
+		<PackageReference Include="Syncfusion.Maui.PdfViewer" Version="*" />
+		<PackageReference Include="Syncfusion.Pdf.NET" Version="*" />
+	</ItemGroup>
+
+</Project>

EncryptingPDF/EncryptingPDF/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:syncfusion="clr-namespace:Syncfusion.Maui.PdfViewer;assembly=Syncfusion.Maui.PdfViewer" 
+             xmlns:local="clr-namespace:EncryptingPDF"
+             x:Class="EncryptingPDF.MainPage">
+
+    <ContentPage.BindingContext>
+        <local:PdfViewerViewModel/>
+    </ContentPage.BindingContext>
+
+    <ContentPage.Content>
+        <syncfusion:SfPdfViewer x:Name="pdfViewer" DocumentSource="{Binding  OutputPdfDocument}">
+        </syncfusion:SfPdfViewer>
+    </ContentPage.Content>
+
+</ContentPage>

EncryptingPDF/EncryptingPDF/MainPage.xaml.cs

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+namespace EncryptingPDF
+{
+    public partial class MainPage : ContentPage
+    {
+        public MainPage()
+        {
+            InitializeComponent();            
+        }     
+    }
+
+}

EncryptingPDF/EncryptingPDF/MauiProgram.cs

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+using Microsoft.Extensions.Logging;
+using Syncfusion.Maui.Core.Hosting;
+
+namespace EncryptingPDF
+{
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder
+                .UseMauiApp<App>()
+                .ConfigureSyncfusionCore()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+                });
+
+#if DEBUG
+    		builder.Logging.AddDebug();
+#endif
+
+            return builder.Build();
+        }
+    }
+}

EncryptingPDF/EncryptingPDF/PdfViewerViewModel.cs

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+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Security;
+using System.ComponentModel;
+using System.Reflection;
+
+
+namespace EncryptingPDF
+{
+    internal class PdfViewerViewModel : INotifyPropertyChanged
+    {
+        //fields 
+        private Stream? _inputPdfDocument;
+        private Stream? _outputPdfDocument;
+        private FileStream outputStream;
+
+        //An event to detect the change in the value of a property.
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        //The PDF document stream that is loaded into the instance of the PDF viewer. 
+        public Stream? OutputPdfDocument
+        {
+            get { return _outputPdfDocument; }
+            set
+            {
+                _outputPdfDocument = value;
+                OnPropertyChanged("OutputDocument");
+            }
+        }
+
+        //Constructor of the view model class
+        public PdfViewerViewModel()
+        {
+            //Accessing the PDF document that is added as embedded resource as stream.
+            _inputPdfDocument = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("EncryptingPDF.Assets.PDF_Succinctly.pdf");
+
+            //Load existing PDF document.
+            PdfLoadedDocument document = new PdfLoadedDocument(_inputPdfDocument);
+
+            // //Create a document security.
+            // PdfSecurity security = document.Security;
+
+            // //Set encryption algorithm.
+            // security.Algorithm = PdfEncryptionAlgorithm.AES;
+
+            // //Set key size.
+            // security.KeySize = PdfEncryptionKeySize.Key256Bit;
+
+            // //Set user password for the document.
+            // security.UserPassword = "Sample@123";
+
+            // Create a file stream to save the PDF document. Here a file named "EncryptedPdf.pdf" is created in the application's data directory.
+            string filepath = Path.Combine(FileSystem.Current.AppDataDirectory, "EncryptedPdf.pdf");
+            outputStream = new FileStream(filepath, FileMode.Create, FileAccess.ReadWrite);
+            // Save the PDF document.
+            document.Save(outputStream);
+
+            //Assign the output file to property to use in the Document source for loading the PDF 
+            OutputPdfDocument = outputStream;
+
+        }
+
+        // Method to notify when a property changes
+        public void OnPropertyChanged(string name)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+        }
+    }
+}

EncryptingPDF/EncryptingPDF/Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

EncryptingPDF/EncryptingPDF/Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace EncryptingPDF
+{
+    [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+    public class MainActivity : MauiAppCompatActivity
+    {
+    }
+}

EncryptingPDF/EncryptingPDF/Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace EncryptingPDF
+{
+    [Application]
+    public class MainApplication : MauiApplication
+    {
+        public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+            : base(handle, ownership)
+        {
+        }
+
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

EncryptingPDF/EncryptingPDF/Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

EncryptingPDF/EncryptingPDF/Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace EncryptingPDF
+{
+    [Register("AppDelegate")]
+    public class AppDelegate : MauiUIApplicationDelegate
+    {
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

EncryptingPDF/EncryptingPDF/Platforms/MacCatalyst/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <!-- See https://aka.ms/maui-publish-app-store#add-entitlements for more information about adding entitlements.-->
+    <dict>
+        <!-- App Sandbox must be enabled to distribute a MacCatalyst app through the Mac App Store. -->
+        <key>com.apple.security.app-sandbox</key>
+        <true/>
+        <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
+        <key>com.apple.security.network.client</key>
+        <true/>
+    </dict>
+</plist>
+

EncryptingPDF/EncryptingPDF/Platforms/MacCatalyst/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <!-- The Mac App Store requires you specify if the app uses encryption. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/itsappusesnonexemptencryption -->
+    <!-- <key>ITSAppUsesNonExemptEncryption</key> -->
+    <!-- Please indicate <true/> or <false/> here. -->
+
+    <!-- Specify the category for your app here. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/lsapplicationcategorytype -->
+    <!-- <key>LSApplicationCategoryType</key> -->
+    <!-- <string>public.app-category.YOUR-CATEGORY-HERE</string> -->
+	<key>UIDeviceFamily</key>
+	<array>
+		<integer>2</integer>
+	</array>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>arm64</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>XSAppIconAssets</key>
+	<string>Assets.xcassets/appicon.appiconset</string>
+</dict>
+</plist>