@europeum-ebsi/did-jwt

This library is a fork of did-jwt.

The did-JWT library allows you to sign and verify JSON Web Tokens (JWT) using ES256, ES256K and EdDSA algorithms.

Public keys are resolved using the Decentralized ID (DID) of the signing identity of the token, which is passed as the iss attribute of the JWT payload.

DID methods

All DID methods that can be resolved using the did-resolver interface are supported for verification.

If your DID method requires a different signing algorithm than what is already supported, please create an issue.

Installation

npm install @europeum-ebsi/did-jwt

Example

1. Create a did-JWT

In practice, you must secure the key passed to ES256KSigner. The key provided in code below is for informational purposes only.

import didJWT from "@europeum-ebsi/did-jwt";

const signer = didJWT.ES256KSigner(
  didJWT.hexToBytes(
    "278a5de700e29faae8e40e366ec5012b5ec63d36ec77e8a2417154cc1d25383f",
  ),
);

let jwt = didJWT.createJWT(
  {
    aud: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
    iat: undefined,
    name: "uPort Developer",
  },
  { signer },
  { typ: "JWT" },
);
console.log(jwt);

2. Decode a did-JWT

Try decoding the JWT. You can also do this using jwt.io

//pass the jwt from step 1
let decoded = didJWT.decodeJWT(jwt);
console.log(decoded);

Once decoded a did-JWT will resemble:

expect(decoded).toEqual({
  header: { alg: "ES256K", typ: "JWT" },
  payload: {
    aud: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
    name: "uPort Developer",
    iss: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
  },
  signature:
    "mAhpAnw-9u57hyAaDufj2GPMbmuZyPDlU7aYSUMKk7P_9_cF3iLk-hFjFhb5xaUQB5nXYrciw6ZJ2RSAZI-IDQ",
  data: "eyJhbGciOiJFUzI1NksiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJkaWQ6ZXRocjoweGYzYmVhYzMwYzQ5OGQ5ZTI2ODY1ZjM0ZmNhYTU3ZGJiOTM1YjBkNzQiLCJuYW1lIjoidVBvcnQgRGV2ZWxvcGVyIiwiaXNzIjoiZGlkOmV0aHI6MHhmM2JlYWMzMGM0OThkOWUyNjg2NWYzNGZjYWE1N2RiYjkzNWIwZDc0In0",
});

3. Verify a did-JWT

You need to provide a did-resolver for the verify function. For this example we will use did:ethr, but there are other methods available. For more information on configuring the Resolver object please see did-resolver

npm install ethr-did-resolver

import { Resolver } from "did-resolver";
import { getResolver } from "ethr-did-resolver";

let resolver = new Resolver({
  ...getResolver({ infuraProjectId: "<get a free ID from infura.io>" }),
});

// use the JWT from step 1
let verificationResponse = await didJWT.verifyJWT(jwt, {
  resolver,
  audience: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
});
console.log(verificationResponse);

A verification response is an object resembling:

expect(verificationResponse).toEqual({
  payload: {
    aud: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
    name: "uPort Developer",
    iss: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
  },
  didResolutionResult: {
    didDocumentMetadata: {},
    didResolutionMetadata: { contentType: "application/did+ld+json" },
    didDocument: {
      "@context": [
        "https://www.w3.org/ns/did/v1",
        "https://w3id.org/security/suites/secp256k1recovery-2020/v2",
      ],
      id: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
      verificationMethod: [
        {
          id: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74#controller",
          type: "EcdsaSecp256k1RecoveryMethod2020",
          controller: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
          blockchainAccountId:
            "eip155:1:0xF3beAC30C498D9E26865F34fCAa57dBB935b0D74",
        },
      ],
      authentication: [
        "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74#controller",
      ],
      assertionMethod: [
        "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74#controller",
      ],
    },
  },
  issuer: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
  signer: {
    id: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74#controller",
    type: "EcdsaSecp256k1RecoveryMethod2020",
    controller: "did:ethr:0xf3beac30c498d9e26865f34fcaa57dbb935b0d74",
    blockchainAccountId: "eip155:1:0xF3beAC30C498D9E26865F34fCAa57dBB935b0D74",
  },
  jwt: "eyJhbGciOiJFUzI1NksiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJkaWQ6ZXRocjoweGYzYmVhYzMwYzQ5OGQ5ZTI2ODY1ZjM0ZmNhYTU3ZGJiOTM1YjBkNzQiLCJuYW1lIjoidVBvcnQgRGV2ZWxvcGVyIiwiaXNzIjoiZGlkOmV0aHI6MHhmM2JlYWMzMGM0OThkOWUyNjg2NWYzNGZjYWE1N2RiYjkzNWIwZDc0In0.mAhpAnw-9u57hyAaDufj2GPMbmuZyPDlU7aYSUMKk7P_9_cF3iLk-hFjFhb5xaUQB5nXYrciw6ZJ2RSAZI-IDQ",
  policies: {},
});