jsigs-example

.gitignore

node_modules

README.md

jsigs-example

Run

npm i
npm start

index.js

require = require('esm')(module);
module.exports = require('./main.js');

main.js

import jsigs from 'jsonld-signatures';
const { purposes: { AssertionProofPurpose } } = jsigs;
import {Ed25519VerificationKey2020} from '@digitalbazaar/ed25519-verification-key-2020';
import {Ed25519Signature2020} from '@digitalbazaar/ed25519-signature-2020';
import { JsonLdDocumentLoader } from 'jsonld-document-loader';
import credContext from 'credentials-context';
const {contexts, constants: contextConstants} = credContext;

const jsonLdDocumentLoader = new JsonLdDocumentLoader();

jsonLdDocumentLoader.addStatic('https://www.w3.org/2018/credentials/v1', contexts.get('https://www.w3.org/2018/credentials/v1'));
jsonLdDocumentLoader.addStatic(Ed25519Signature2020.CONTEXT_URL, Ed25519Signature2020.CONTEXT);

// create the unsigned credential
const unsignedCredential = {
  '@context': [
    'https://www.w3.org/2018/credentials/v1',
    {
      AlumniCredential: 'https://schema.org#AlumniCredential',
      alumniOf: 'https://schema.org#alumniOf',
    },
  ],
  id: 'http://example.edu/credentials/1872',
  type: ['VerifiableCredential', 'AlumniCredential'],
  issuer: 'https://example.edu/issuers/565049',
  issuanceDate: '2010-01-01T19:23:24Z',
  credentialSubject: {
    id: 'https://example.edu/students/alice',
    alumniOf: 'Example University',
  },
};

// create the keypair to use when signing
const controller = 'https://example.edu/issuers/565049';


async function run() {
  const keyPair = await Ed25519VerificationKey2020.from({
    type: 'Ed25519VerificationKey2020',
    controller,
    id: `${controller}#z6MknCCLeeHBUaHu4aHSVLDCYQW9gjVJ7a63FpMvtuVMy53T`,
    publicKeyMultibase: 'z6MknCCLeeHBUaHu4aHSVLDCYQW9gjVJ7a63FpMvtuVMy53T',
    privateKeyMultibase: 'zrv2EET2WWZ8T1Jbg4fEH5cQxhbUS22XxdweypUbjWVzv1YD6VqYu' + 'W6LH7heQCNYQCuoKaDwvv2qCWz3uBzG2xesqmf',
  });

  const suite = new Ed25519Signature2020({ key: keyPair });
  suite.date = '2010-01-01T19:23:24Z';

  const signedCredential = await jsigs.sign(unsignedCredential, {
    suite,
    purpose: new AssertionProofPurpose(),
    documentLoader: jsonLdDocumentLoader.documentLoader.bind(jsonLdDocumentLoader)
  });

  console.log(signedCredential);
}

run().catch(console.error);

package.json

{
  "name": "t2",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@digitalbazaar/ed25519-signature-2020": "^3.0.0",
    "@digitalbazaar/ed25519-verification-key-2020": "^3.2.0",
    "credentials-context": "^2.0.0",
    "esm": "^3.2.25",
    "jsonld-document-loader": "^1.2.0",
    "jsonld-signatures": "^9.3.1"
  }
}