Adding an image to a VC with Microsoft Authenticator and Entra Verified ID

VariousOriginal: CytisDerivative work: unknownNew version: Tukp, CC0, via Wikimedia Commons

Claims in a VC can be both text and image.

There is not much information about VC images out there, but the docs. refer to:

“The uploaded photo for the user. The image type should be JPEG and the maximum size is 2MB. When presenting the photo claim to a verifier, the photo claim is in the UrlEncode(Base64Encode(photo)) format. To use the photo, the verifier application has to Base64Decode(UrlDecode(photo))”.

I created a VC for a “passport” that included a passport image.

I used this article for some hints.

The article shows the type of the image, which is:

"type": "image/jpg;base64url"

The JSON in the “passport” VC display file is then:

{
   "claim": "vc.credentialSubject.Image",
   "label": "Image",
   "type": "image/jpg;base64url"
  }

The JSON in the Postman file is then:

"Image": "_9j_4AAQSkZJRgABAgEAeAB4AAD_4QBaRXhpZgAATU0AKgAAAAgAAYdpAAQ.....hdj"

where you paste in the output of the code below.

The above article has some code that I adapted.

The code is:

using Microsoft.IdentityModel.Tokens;
using System;
using System.Drawing;
using System.IO;

class Program
{
    static void Main()
    {
        try
        {
            // Provide the path to the image file
            string imagePath = @"C:\...\Passport.jpg";

            // Load the image from the file using a stream
            using (FileStream stream = new FileStream(imagePath, FileMode.Open))
            {
                Image image = Image.FromStream(stream);

                // Convert the image to Base64 encoded string
                string base64Image = ConvertImageToBase64(image);

                // Display the base64 encoded image
                Console.WriteLine("Base64 Encoded Image:");
                Console.WriteLine(base64Image);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"An error occurred: {ex.Message}");
        }
    }

I used this image from Wikimedia as my “passport” image:

VariousOriginal: CytisDerivative work: unknownNew version: Tukp, CC0, via Wikimedia Commons

I had to trim it because there is a limit on the size of the image.

If you look at the claims in the VC after you issue your “passport” VC, you’ll see:

All good!