This repository contains libraries and applications for working with Real-World Identity. The initial focus for this work was mdoc/mDL according to ISO/IEC 18013-5:2021 and related standards (mainly ISO 23220 series and ISO 18013-7) but the current scope also include other credential formats.
The project includes libraries written in Kotlin:
identityprovides the core building blocks and which can also be used in server-side environments.identity-mdocprovides data structures and routines for working with mdoc credentials. This library can also be used in server-side-environmentsidentity-androidprovides Android-specific extensions. It is designed to run on Android (API 24 or later) and will take advantage of Android-specific features including hardware-backed Keystore, NFC, Bluetooth Low Energy, and so on.identity-android-legacycontains an older version of the APIs for applications not yet migrated to the newer libraries. At some point this library will be removed. Unlike the other libraries and applications, this library is in Java, not Kotlin.identity-doctypescontains known credential document types (for example ISO/IEC 18013-5:2021 mDL and EU PID) along with human-readable descriptions of claims / data elements and also sample data. This is packaged separately from the coreidentitylibrary because its size is non-negligible and not all applications need this or they may bring their own.
These libraries are intended to be used by Wallet Applications (mobile applications on the credential holder's device), Reader Applications (applications operated on device controlled by the verifier), and Issuance Systems (applications operated by the credential issuer or their agent). They provide the following building blocks
- A light-weight Secure Area abstraction for hardware-backed keystore
- Applications can create hardware-backed Elliptic Curve Cryptography keys which can be used for creating Signatures or performing Key Agreement. Each key will have an attestation which can be used to prove to Relying Parties (such as a credential issuer) that the private part of the key only exists in a Secure Area.
- The
identity-androidlibrary includes an implementation based on Android Keystore with support for requiring user authentication (biometric or lock-screen knowledge factor, e.g. system PIN) for unlocking the key and also can use StrongBox if available on the device. This is appropriate to use in Android applications implementing ISO/IEC 18013-5:2021 for storingDeviceKey. - The
identitylibrary includes an implementation backed by BouncyCastle with support for passphrase-protected keys. This isn't suitable for use in Mobile Applications as its not backed by Secure Hardware. - Applications can supply their own Secure Area implementations for e.g. externally attached dongles, cloud based HSMs, or whatever the issuer deems appropriate to protect key material associated with their credential.
- A Credential Store for storage of one or more Credentials
- Each Credential has a Credential Key which can be used by the issuer to bind a credential to a specific device which is useful when issuing updates or refreshing a credential.
- Additionally, each Credential has one or more Authentication Keys which can be endorsed by the issuer and used at presentation time.
- Finally, namespaced data and arbritrary key/value pairs can be stored in a Credential which can be used for credential data and claims. This data is stored encrypted at rest.
- Data structures and code for provisioning of mdoc/mDLs
- This code can can be used both on the device and issuer side. No networking protocol is defined, the application has to define its own.
- Parsers and generators for all data structures used in ISO/IEC 18013-5:2021
presentations, including
DeviceResponse,DeviceRequest,MobileSecurityObjectand many other CBOR data structures. - An implementation of the ISO/IEC 18013-5:2021 presentation flows including QR engagement, NFC engagement (both static and negotiated), device retrieval (BLE, Wifi Aware, and NFC)
Currently these libraries require a Java runtime environment but the plan is to target Kotlin Multiplatform for the libraries and Compose Multiplatform for applications and samples.
A command-line tool identityctl is included which can be used to generate
ISO/IEC 18013-5:2021 IACA test certificates among other things. Use
./gradlew --quiet runIdentityCtl --args "help" for documentation on supported
verbs and options.
Libraries are released on GMaven as needed and version numbers are encoded as YYYYMMDD. With each release, we also publish documentation at https://openwallet-foundation-labs.github.io/identity-credential/.
This repository also contains two Android applications using this library
in the appholder and appverifier modules. The Wallet application is a simple
self-contained application which allows creating a number of mdoc credentials
using four different mdoc Document Types:
org.iso.18013.5.1.mDL: Mobile Driving Licenseorg.micov.1: mdoc for eHealth (link)nl.rdw.mekb.1: mdoc for Vehicle Registration (link)eu.europa.ec.eudiw.pid.1: mdoc for Personal Identification
and their associated mdoc name spaces. The first one is defined in ISO/IEC 18013-5:2021 and the other three have been used at mdoc/mDL test events organized by participants of the ISO/IEC JTC1 SC17 WG10 working group.
The appholder offers two flavors: wallet and purse. There is not much difference between
the two, except they have different application id, so they can coexist in a single device.
They also have different labels and icon color. To select the desired flavor when running the app
on a device/emulator, inside the Android Studio open the Build Variants panel. It should be easily
reachable on the left side bar of the Android Studio, or by selecting: View -> Tool Windows -> Build Variants.
Inside the Build Variants panel, at the appholder row, the desired flavor can be chosen. Once a
flavor is selected, by running the app it will install it on the target device/emulator.
The wallet module is a rewrite of the appholder reference application
with an eye towards a production-quality and easily rebrandable identity
wallet application.
The samples/ directory contain a number of sample applications, intended primarily
to show certain library features or assess performance or correctness. The following
samples are included
preconsent-mdl- Simple mDL application without user consent authentication.- The main purpose of this sample is to assess performance of our libraries, Android, the device it's being run on, and the mDL reader requesting the mDL.
- The application allows the user to easily configure which kind of data transfer
method to use, including an idealized near-zero latency method (
DataTransportUdp) to help pinpoint potential performance bottlenecks not related to data transfer.
age-verifier-mdl- a simple mDL reader for age attestations.- This application is just requesting the
age_over_21andportrait. It's intended to be used with thepreconsent-mdlsample for performance evaluation.
- This application is just requesting the
simple-verifier- a simple mDL reader for age attestations.- This application requests either {
age_over_21andportrait} or {age_over_18andportrait}. It's intended to demonstrate use of theMdocReaderPromptclass, which allows any app to easily act as a reader app for the common age-verification use case.
- This application requests either {
The wwwverifier module contains the source code for a website acting as an
mdoc reader according to the latest ISO 18013-7 working draft (as of Sep 2023)
and it's implementing the so-called REST API. There is currently a test instance
of this application available at https://mdoc-reader-external.uc.r.appspot.com/.
The Wallet Android application also has support for the REST API and registers
on Android for the mdoc:// URI scheme. This can be tested end-to-end by going
to the reader website (URL above) and clicking on one of the "Request" buttons,
and then hitting the mdoc:// link presented on the site. This will cause the
browser to invoke the Wallet app which will then connect to the reader and send
the credential after user consent.
First, a project must first be created at https://console.cloud.google.com. Afterwards, navigate to Cloud Shell (https://shell.cloud.google.com), and clone the Identity Credential Library repository:
git clone https://github.com/google/identity-credential.git
Open the file wwwverifier/build.gradle, and set the property projectId to the
project ID that you used to create your Cloud project:
appengine {
deploy { // deploy configuration
version = 'v1'
projectId = '<YOUR_PROJECT_ID>'
...
}
}
Grant Datastore Owner permissions to your AppEngine service account:
gcloud projects add-iam-policy-binding <YOUR_PROJECT_ID> \
--member="serviceAccount:<YOUR_PROJECT_ID>@appspot.gserviceaccount.com" \
--role="roles/datastore.owner"
Then, navigate to wwwverifier:
cd ~/identity-credential/wwwverifier
To run the website locally, execute the command:
gradle appengineRun
To deploy the website on a live server, execute the command:
gradle appengineDeploy
The above command will create a link to a live website. Then, navigate to the file
~/identity-credential/wwwverifier/src/main/java/com/android/identity/wwwreader/ServletConsts.java,
and replace the following field with your website URL:
public static final String BASE_URL = "<YOUR_WEBSITE_URL>";
The name of the project is currently "Identity Credential" and it's using
com.android.identity as the Java package name. This is because of the
fact that the project was contributed from Google. Work is underway
to find a new name and Java package name, see Issue #422.
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