Refactored StegoEntry

examples/StegoBlazorApp/App.razor

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+<Router AppAssembly="@typeof(App).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>Not found</PageTitle>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p role="alert">Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>

examples/StegoBlazorApp/Pages/Decode.razor

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+@page "/decode"
+@using System.IO
+@using Microsoft.AspNetCore.Components.Forms
+
+<div class="container">
+    <div class="row">
+        <InputFile OnChange="HandleSelected" accept=".jpg,.jpeg,.png,.bmp" />
+    </div>
+    <div class="row">
+        <div class="col-md">
+            @if (imageBase64 != null)
+            {
+                <div>
+                    <img src="@imageBase64" />
+                </div>
+                <div class="d-flex justify-content-center mt-2">
+                    <button class="btn btn-primary" @onclick="Decrypt">Decrypt</button>
+                </div>
+
+            }
+        </div>
+        <div class="col-md">
+            <div class="h-100 d-flex flex-column align-items-center justify-content-center">
+                @if (secret != null)
+                {
+                    <div>
+                        <p>Your secret</p>
+                    </div>
+                    <input class="form-control" type="text" value="@secret" readonly>
+                }
+            </div>
+        </div>
+    </div>
+
+</div>
+
+@code {
+    private string? imageBase64;
+    private byte[]? imageBytes;
+
+    private string? secret;
+
+    private async Task HandleSelected(InputFileChangeEventArgs e)
+    {
+        var imageFile = e.File;
+        if (imageFile != null)
+        {
+            using MemoryStream ms = new();
+            using var stream = imageFile.OpenReadStream();
+            await stream.CopyToAsync(ms);
+            imageBytes = ms.ToArray();
+            imageBase64 = $"data:image/png;base64,{Convert.ToBase64String(imageBytes)}";
+        }
+    }
+
+    private void Decrypt()
+    {
+        if (imageBytes == null)
+        {
+            return;
+        }
+
+        using var stream = new MemoryStream(imageBytes);
+        using var stego = new StegoCore.Stego(stream);
+        var result = stego.Decode(StegoCore.Algorithms.AlgorithmEnum.Lsb);
+
+        // convert result to string
+        secret = System.Text.Encoding.UTF8.GetString(result);
+    }
+}

examples/StegoBlazorApp/Pages/Embed.razor

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+@page "/embed"
+@using System.IO
+@using Microsoft.AspNetCore.Components.Forms
+@inject IJSRuntime JS
+
+<div class="container">
+    <div class="row">
+        <InputFile OnChange="HandleSelected" accept=".jpg,.jpeg,.png,.bmp" />
+    </div>
+    <div class="row">
+            <div class="col-md">
+                @if (imageBase64 != null)
+                {
+                    <div>
+                        <img src="@imageBase64" />
+                    </div>
+                    <div class="d-flex justify-content-center mt-2">
+                        <input type="text" @bind="secret" id="secret" placeholder="Enter your secret" class="m-2" />
+                        <button class="btn btn-primary m-2" @onclick="Encrypt">Encrypt</button>
+                    </div>
+
+                }
+            </div>
+            <div class="col-md">
+                @if (imageEncrypted != null)
+                {
+                    <img src="@imageEncrypted" />
+                    <div class="d-flex justify-content-center mt-2">
+                        <button class="btn btn-primary" @onclick="Download">Download</button>
+                    </div>
+                }
+            </div>
+    </div>
+
+</div>
+
+@code {
+    private string? imageBase64;
+    private byte[]? imageBytes;
+    private string? secret;
+    private byte[]? imageEncryptedBytes;
+    private string? imageEncrypted;
+
+
+    private async Task HandleSelected(InputFileChangeEventArgs e)
+    {
+        var imageFile = e.File;
+        if (imageFile != null)
+        {
+            using MemoryStream ms = new();
+            var format = "image/png";
+            using var stream = imageFile.OpenReadStream();
+            await stream.CopyToAsync(ms);
+            imageBytes = ms.ToArray();
+            imageBase64 = $"data:{format};base64,{Convert.ToBase64String(imageBytes)}";
+        }
+    }
+
+    private async Task Encrypt()
+    {
+        if (secret is null || imageBytes is null)
+        {
+            return;
+        }
+
+        var secretData = System.Text.Encoding.UTF8.GetBytes(secret);
+        using (var stream = new MemoryStream(imageBytes))
+        {
+            using (var stego = new StegoCore.Stego(stream))
+            {
+                var imageWithSecret = stego.Embed(new StegoCore.Core.SecretData(secretData), StegoCore.Algorithms.AlgorithmEnum.Lsb);
+                using var outputStream = new MemoryStream();
+                await imageWithSecret.SaveAsync(outputStream, new SixLabors.ImageSharp.Formats.Png.PngEncoder());
+                imageEncryptedBytes = outputStream.ToArray();
+                imageEncrypted = $"data:image/png;base64,{Convert.ToBase64String(imageEncryptedBytes)}";
+            }
+        }
+    }
+
+    private async Task Download()
+    {
+        if (imageEncryptedBytes is null)
+        {
+            return;
+        }
+
+        var stream = new MemoryStream(imageEncryptedBytes);
+
+        using var streamRef = new DotNetStreamReference(stream: stream);
+
+        await JS.InvokeVoidAsync("downloadFileFromStream", "encrypted.png", streamRef);
+    }
+}

examples/StegoBlazorApp/Pages/Error.cshtml

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+@page
+@model StegoBlazorApp.Pages.ErrorModel
+
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <title>Error</title>
+    <link href="~/css/bootstrap/bootstrap.min.css" rel="stylesheet" />
+    <link href="~/css/site.css" rel="stylesheet" asp-append-version="true" />
+</head>
+
+<body>
+    <div class="main">
+        <div class="content px-4">
+            <h1 class="text-danger">Error.</h1>
+            <h2 class="text-danger">An error occurred while processing your request.</h2>
+
+            @if (Model.ShowRequestId)
+            {
+                <p>
+                    <strong>Request ID:</strong> <code>@Model.RequestId</code>
+                </p>
+            }
+
+            <h3>Development Mode</h3>
+            <p>
+                Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
+            </p>
+            <p>
+                <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+                It can result in displaying sensitive information from exceptions to end users.
+                For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+                and restarting the app.
+            </p>
+        </div>
+    </div>
+</body>
+
+</html>

examples/StegoBlazorApp/Pages/Error.cshtml.cs

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+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace StegoBlazorApp.Pages;
+
+[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+[IgnoreAntiforgeryToken]
+public class ErrorModel : PageModel
+{
+    public string? RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+    private readonly ILogger<ErrorModel> _logger;
+
+    public ErrorModel(ILogger<ErrorModel> logger)
+    {
+        _logger = logger;
+    }
+
+    public void OnGet()
+    {
+        RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+    }
+}

examples/StegoBlazorApp/Pages/Index.razor

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+@page "/"
+
+<PageTitle>Index</PageTitle>
+
+<h1>Hello from StegoCore!</h1>
+
+This example show how to use StegoCore library

examples/StegoBlazorApp/Pages/_Host.cshtml

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+@page "/"
+@using Microsoft.AspNetCore.Components.Web
+@namespace StegoBlazorApp.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <base href="~/" />
+    <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
+    <link href="css/site.css" rel="stylesheet" />
+    <link href="StegoBlazorApp.styles.css" rel="stylesheet" />
+    <link rel="icon" type="image/png" href="favicon.png"/>
+    <component type="typeof(HeadOutlet)" render-mode="ServerPrerendered" />
+</head>
+<body>
+    <component type="typeof(App)" render-mode="ServerPrerendered" />
+
+    <div id="blazor-error-ui">
+        <environment include="Staging,Production">
+            An error has occurred. This application may no longer respond until reloaded.
+        </environment>
+        <environment include="Development">
+            An unhandled exception has occurred. See browser dev tools for details.
+        </environment>
+        <a href="" class="reload">Reload</a>
+        <a class="dismiss">🗙</a>
+    </div>
+
+    <script src="_framework/blazor.server.js"></script>
+    <script>
+      window.downloadFileFromStream = async (fileName, contentStreamReference) => {
+        const arrayBuffer = await contentStreamReference.arrayBuffer();
+        const blob = new Blob([arrayBuffer]);
+        const url = URL.createObjectURL(blob);
+        const anchorElement = document.createElement('a');
+        anchorElement.href = url;
+        anchorElement.download = fileName ?? '';
+        anchorElement.click();
+        anchorElement.remove();
+        URL.revokeObjectURL(url);
+      }
+  </script>
+</body>
+</html>

examples/StegoBlazorApp/Program.cs

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+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddRazorPages();
+builder.Services.AddServerSideBlazor();
+builder.Services.AddHttpClient();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error");
+}
+
+
+app.UseStaticFiles();
+
+app.UseRouting();
+
+app.MapBlazorHub();
+app.MapFallbackToPage("/_Host");
+
+app.Run();

examples/StegoBlazorApp/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:14315",
+      "sslPort": 0
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5051",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

examples/StegoBlazorApp/Shared/MainLayout.razor

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+@inherits LayoutComponentBase
+
+<PageTitle>StegoBlazorApp</PageTitle>
+
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
+    </div>
+
+    <main>
+        <div class="top-row px-4">
+            <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
+        </div>
+
+        <article class="content px-4">
+            @Body
+        </article>
+    </main>
+</div>