Digital Covid Certificate

This package will parse and verify a European Digital Covid Certificates (DCC). Certificates in the form of QR-codes are being handed down to all vaccinated, recovered or tested citizens of the European Union.

Installation

You can install this package by using your favourite package manager

npm install covid-certificate --save

Webpack >= 5.0

Webpack < 5 used to include polyfills for node.js core modules by default. This is no longer the case. You will need to install and configure the polyfills yourself if you are using this package in the browser. For example by using the node-polyfill-webpack-plugin

npm install node-polyfill-webpack-plugin

configure webpack.config.js

const NodePolyfillPlugin = require("node-polyfill-webpack-plugin")

module.exports = {
    // Other rules...
    plugins: [
          new NodePolyfillPlugin()
    ]
}

Getting started

This package can parse and verify the signature of digital covid certificate

Signature verification

To verify a certificate:

import { readCertificate } from "covid-certificate";

const cert = readCertificate("HC1:your_certificate_from_QR_code_scanner");
const verfificationResult = verifySignature(cert);

if (!verfificationResult.isValid()) {
  console.log(verfificationResult.getMessage());
}

Parsing certificate

Parsing the certificate will give you access to all the data inside the certificate. Before parsing it is recommended to verify the signature!

import { parse } from "covid-certificate";

const healthCertificate = parse("HC1:certificate_data_from_QR_code");
console.log(healthCertificate);

HealthCertificate

The HealthCertificate contains the following data

Property	Type	Description
kid	string	The unique id of the issuer
alg	string	The algorithm used to sign the certificate
expirationDate	Date	Expiration date of certificate
issuedAt	Date	Certificate issued at date
dateOfBirth	string	Date of birth
name	string	Name of the person
vaccinations	array	The vaccinations
recovered	array	Recovery data
tests	array	Test data
version	string	Version

Full example

Following full example will give you a guide on how to use this library.

import { readCertificate, parseCoseCertificate, verifySignature } from "covid-certificate";

const cert = readCertificate(
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
);
const verfificationResult = verifySignature(cert);

if (!verfificationResult.isValid()) {
  console.log(verfificationResult.getMessage())
}

const healthCertificate = parseCoseCertificate(cert)

// Display vaccination information
if (healthCertificate.vaccinations.length > 0) {
  console.log(healthCertificate.vaccinations[0]);
}

will display

{
  "target": "COVID-19",
  "vaccineType": "MRNA",
  "medicinalProduct": "EU/1/20/1507",
  "manufacturer": "ORG-100031184",
  "doseNumber": 1,
  "totalDoses": 2,
  "date": "2021-05-29",
  "country": "DE",
  "issuer": "Robert Koch-Institut",
  "id": "URN:UVCI:01DE/IZ12345A/5CWLU12RNOB9RXSEOP6FG8#W"
}

Documentation

Full documentation of the library can be found here

Author

This library is written by Benno Tielen. Contributions are welcome!