Missing IssuerSigned Items in a mdoc authentication session

[vanhoanHoang]

Hi team,

I have recently looked at the OpenID4VP with mdoc format and run into a Wallet issue which does not send IssuerSigned items to Verifier. I have created a mdoc credential org.iso.18013.5.1.mDL containing 3 attributes: family_name, given_name, birth_date

I then created a verification session to request the Wallet to submit this credential. The presentation_definition looks like this:

{
   "id":"803c9bc1-ce15-47b2-8b60-9023db04cc0c",
   "input_descriptors":[
      {
         "id":"org.iso.18013.5.1.mDL",
         "purpose":"Testing mdoc",
         "format":{
            "mso_mdoc":{
               "alg":[
                  "RSA",
                  "ECDSA",
                  "EdDSA"
               ]
            }
         },
         "constraints":{
            "fields":[
               {
                  "path":[
                     "family_name"
                  ],
                  "filter":{
                     "pattern":".*",
                     "type":"string"
                  },
                  "intent_to_retain":true
               },
               {
                  "path":[
                     "$.type"
                  ],
                  "filter":{
                     "pattern":"org.iso.18013.5.1.mDL",
                     "type":"string"
                  },
                  "intent_to_retain":true
               }
            ]
         }
      }
   ]
}

Note that I added family_name in the presentation_definiton for testing purpose only. More specifically, I added this in the suspect of Wallet only sending attributes required explicitly in the presentation_definition. But removing it does not have any effect on Wallet behavior, resulting in the same vp_token which does not contain any IssuerSigned items as indicated below:

The following is an vp_token constructed by the Wallet to present to Verifier:

vp_token=o2d2ZXJzaW9uYzEuMGlkb2N1bWVudHOBo2dkb2NUeXBldW9yZy5pc28uMTgwMTMuNS4xLm1ETGxpc3N1ZXJTaWduZWSiam5hbWVTcGFjZXOhcW9yZy5pc28uMTgwMTMuNS4xgGppc3N1ZXJBdXRohEOhASahGCFZAUswggFHMIHuoAMCAQICCDntyHqaePkqMAoGCCqGSM49BAMCMBcxFTATBgNVBAMMDE1ET0MgUk9PVCBDQTAeFw0yNDA1MDIxMzEzMzBaFw0yNTA1MDIxMzEzMzBaMBsxGTAXBgNVBAMMEE1ET0MgVGVzdCBJc3N1ZXIwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQbREg0GIX6hBQPd3kMad6BC5d6cjb0kNowagy-KgpEE3nd3hRrNqRLa6e7wGewS3G61LaSpGFgE9iT1ECuJTeBoyAwHjAMBgNVHRMBAf8EAjAAMA4GA1UdDwEB_wQEAwIHgDAKBggqhkjOPQQDAgNIADBFAiEAjnAEEADd7CojCyWG7MWfis0Vb12TPZNjvF4iY7sKtpgCIBiFqLU3MnppsCJiDwfFxF1ik7hu7ZJ6PwToLMUcrfhjWQHD2BhZAb6mZ3ZlcnNpb25jMS4wb2RpZ2VzdEFsZ29yaXRobWdTSEEtMjU2bHZhbHVlRGlnZXN0c6Fxb3JnLmlzby4xODAxMy41LjGjAFggPOVIT8AfKkEtdFPwfNURxRweIxA5tcVzvFQ3eRBsBekBWCD-C-T_D9EyDjf9RYCShmR-NegK-QpjpLR4m0_0IaCJMQJYINidsvlZ2uy_lNQt86JlAf65aXxjG9zowy5R_0kCyoanbWRldmljZUtleUluZm-haWRldmljZUtleaQBAiABIVgge5FMzcP3o2brlVkHzXr3HLA9UWw4Z5IL-oXpKUatYLwiWCDHPlV4LYM5MtrPDorZgmNcE93i4fXco09IRGaRdQmIzWdkb2NUeXBldW9yZy5pc28uMTgwMTMuNS4xLm1ETGx2YWxpZGl0eUluZm-jZnNpZ25lZMB4HjIwMjQtMDktMDJUMDk6Mjg6MjQuNzM1NjkyNzgwWml2YWxpZEZyb23AeB4yMDI0LTA5LTAyVDA5OjI4OjI0LjczNTY5MzY1NVpqdmFsaWRVbnRpbMB4HjIwMjUtMDktMDJUMDk6Mjg6MjQuNzM1NjkzNzIzWlhATQVhul0vXQkexIdE2jGk3zPyfFPHoWygRKaQ8Vaw-pmOazSE2s8VaG7wEj01m4iZJz1G38ivukUujpKljKFJW2xkZXZpY2VTaWduZWSiam5hbWVTcGFjZXPYGEGgamRldmljZUF1dGihb2RldmljZVNpZ25hdHVyZYRDoQEmoRghgPZYQLgfCA5rVqA3cZKrwLjDcsrutRqeNoGzJCfhD6GiSZmdNL9qaKjfaxCl54QQvLrleCLlDqyPXMzbhHYzbWBiHv1mc3RhdHVzAA%3D%3D&presentation_submission=%7B%22id%22%3A%22pX019X5Dtlmu%22%2C%22definition_id%22%3A%22pX019X5Dtlmu%22%2C%22descriptor_map%22%3A%5B%7B%22id%22%3A%22org.iso.18013.5.1.mDL%22%2C%22format%22%3A%22mso_mdoc%22%2C%22path%22%3A%22%24%22%2C%22path_nested%22%3A%7B%22id%22%3A%22org.iso.18013.5.1.mDL%22%2C%22format%22%3A%22mso_mdoc%22%2C%22path%22%3A%22%24.documents%5B0%5D%22%7D%7D%5D%7D&state=bcQbBJjpuQU

By decoding the vp_token, we can obtain the mdoc details as shown in the Figure below:

We can see that the IssuerSigned items is an empty List as shown in the namespace org.iso.18013.5.1 . I guess there are some problems on the mdoc library side not to include all these items ?

Can you have a look at this please ?

Cheers,
Hoan Hoang