Add PID example (#214)

* Add PID example

* Of course I forgot to add the new files

* Apply suggestions from Brian's review

Co-authored-by: Brian Campbell <[email protected]>

* Disclose only nationality

* Add changelog entry

* Fix yaml specification

* Adapt text

* Fix the description of the example

* Input claim(s)

---------

Co-authored-by: Daniel Fett <[email protected]>
Co-authored-by: Brian Campbell <[email protected]>

Author: 3 people

draft-ietf-oauth-sd-jwt-vc.md

@@ -665,6 +665,13 @@ format encoded as CBOR and secured using COSE.
         </author>
     </front>
 </reference>
+
+<reference anchor="EUDIW.ARF" target="https://github.com/eu-digital-identity-wallet/eudi-doc-architecture-and-reference-framework/releases">
+  <front>
+    <author fullname="European Commission"></author>
+    <title>The European Digital Identity Wallet Architecture and Reference Framework</title>
+  </front>
+</reference>
 {backmatter}
 
 # IANA Considerations
@@ -714,6 +721,51 @@ by [@!RFC5785].
 * Specification document: [[ (#jwt-vc-issuer-metadata) of this of this specification ]]
 * Related information: (none)
 
+# Examples
+
+Important: The following examples are not normative and provided for
+illustrative purposes only. In particular, neither the structure of the claims
+nor the selection of selectively disclosable claims are normative.
+
+Line breaks have been added for readability.
+
+## Example 1: Person Identification Data (PID) Credential
+
+This example shows how the artifacts defined in this specification could
+be used to represent the concept of a Person Identification Data (PID)
+[@EUDIW.ARF] using the data of a German citizen.
+
+Key Binding is applied
+using the Holder's public key passed in a `cnf` claim in the SD-JWT.
+
+The Issuer is using the following input claims set:
+
+<{{examples/03-pid/user_claims.json}}
+
+The following is the issued SD-JWT:
+
+<{{examples/03-pid/sd_jwt_issuance.txt}}
+
+The following payload is used for the SD-JWT:
+
+<{{examples/03-pid/sd_jwt_payload.json}}
+
+The following Disclosures are created by the Issuer:
+
+{{examples/03-pid/disclosures.md}}
+
+The following shows a presentation of the SD-JWT with a Key Binding JWT that discloses only the nationality of the Holder:
+
+<{{examples/03-pid/sd_jwt_presentation.txt}}
+
+The following is the payload of a corresponding Key Binding JWT:
+
+<{{examples/03-pid/kb_jwt_payload.json}}
+
+After the validation, the Verifier will have the following data for further processing:
+
+<{{examples/03-pid/verified_contents.json}}
+
 # Acknowledgements {#Acknowledgements}
 
 We would like to thank
@@ -745,6 +797,7 @@ for their contributions (some of which substantial) to this draft and to the ini
 * Fix some formatting and text in the media type and JWT claim registration requests
 * Clarify the optionality of the `cnf` claim
 * Added relationships to other documents
+* Added PID example
 
 -01
 

examples/03-pid/specification.yml

@@ -0,0 +1,40 @@
+user_claims:
+  vct: https://bmi.bund.example/credential/pid/1.0
+  # vct#integrity: sha256-jo8433ot48utul8ura33
+  !sd given_name: Erika
+  !sd family_name: Mustermann
+  !sd birthdate: '1963-08-12'
+  !sd source_document_type: id_card
+  !sd address:
+    !sd street_address: Heidestraße 17
+    !sd locality: Köln
+    !sd postal_code: '51147'
+    !sd country: DE
+  !sd nationalities:
+  - DE
+  !sd gender: female
+  !sd birth_family_name: Gabler
+  !sd place_of_birth:
+    !sd locality: Berlin
+    country: DE
+  !sd also_known_as: Schwester Agnes
+  age_equal_or_over:
+    !sd '12': true
+    !sd '14': true
+    !sd '16': true
+    !sd '18': true
+    !sd '21': true
+    !sd '65': false
+
+
+holder_disclosed_claims:
+  nationalities:
+    - true
+  #age_equal_or_over:
+  #  '18': true
+
+add_decoy_claims: false
+key_binding: true
+
+extra_header_parameters:
+  typ: "vc+sd-jwt"