[VCL] Sign generated v-card upon using a profile

Closes https://code.vereign.com/code/signing-service-agent/issues/31

javascript/src/iframe/viamapi-iframe.js

@@ -21,6 +21,7 @@ import {
 import { LOGIN_MODES } from "../constants/authentication";
 import {
   CertificateData,
+  ImageData,
   createOneTimePassportCertificate,
   createPassportCertificate,
   decryptMessage,
@@ -1439,7 +1440,7 @@ const connection = Penpal.connectToParent({
         return encodeResponse("400", "", vCardImageResponse.status);
       }
 
-      const vCardImageData = vCardImageResponse.data;
+      const vCardImageData = new ImageData(vCardImageResponse.data);
 
       if (vCardImageData.contentType !== "image/png") {
         return encodeResponse("400", "", "Content type of vCard mmust be 'image/png'");
@@ -1514,7 +1515,8 @@ const connection = Penpal.connectToParent({
         return encodeResponse("400", "", signVCardResponse.status);
       }
 
-      return encodeResponse("200", signVCardResponse.data, "vCard signed");
+      const signedVCardImageData = new ImageData(signVCardResponse.data);
+      return encodeResponse("200", signedVCardImageData, "vCard signed");
     },
     documentCreateDocument: async (passportUUID, path, contentType, title) => {
       const authenticationPublicKey = localStorage.getItem(