jsonld-signatures

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An implementation of the Linked Data Signatures specification for JSON-LD. This software works in all modern browsers as well as node.js.

Introduction

In node.js, include the library like this:

var jsonld = require('jsonld');
var jsig = require('jsonld-signatures');
jsig.use('jsonld', jsonld);

In a browser environment, include the library like this:

You will need to bower install jsonld-signatures and then serve it and its dependencies from your server and include each via a script tag, or other mechanism, in the order: es6-promise, async, jsonld, forge, jsonld-signatures.

Here are some examples on using the library:

// to generate the next two lines, run the following command:
//
// openssl genrsa -out key.pem; cat key.pem; openssl rsa -in key.pem -pubout -out pubkey.pem; cat pubkey.pem; rm key.pem pubkey.pem
//
// for an example of how to specify these keys, look at [key-example]:
var testPublicKeyPem = "-----BEGIN PUBLIC KEY-----\r\n...";
var testPrivateKeyPem = "-----BEGIN PRIVATE KEY-----\r\n...";

// specify the public key object
var testPublicKey = {
  '@context': jsig.SECURITY_CONTEXT_URL,
  '@id': 'https://example.com/i/alice/keys/1',
  owner: 'https://example.com/i/alice',
  publicKeyPem: testPublicKeyPem
};

// specify the public key owner object
var testPublicKeyOwner = {
  "@context": jsig.SECURITY_CONTEXT_URL,
  '@id': 'https://example.com/i/alice',
  publicKey: [testPublicKey]
};

// create the JSON-LD document that should be signed
var testDocument = {
  "@context": {
    schema: 'http://schema.org/',
    name: 'schema:name',
    homepage: 'schema:url',
    image: 'schema:image'
  },
  name: 'Manu Sporny',
  homepage: 'https://manu.sporny.org/',
  image: 'https://manu.sporny.org/images/manu.png'
};

// sign the document and then verify the signed document
jsig.sign(testDocument, {
  privateKeyPem: testPrivateKeyPem,
  creator: 'https://example.com/i/alice/keys/1'
}, function(err, signedDocument) {
  if(err) {
    return console.log('Signing error:', err);
  }
  console.log('Signed document:', signedDocument);

  // verify the signed document
  jsig.verify(signedDocument, {
    publicKey: testPublicKey,
    publicKeyOwner: testPublicKeyOwner,
  }, function(err, verified) {
    if(err) {
      return console.log('Signature verification error:', err);
    }
    console.log('Signature is valid:', verified);
  });
});

// verification
var sign = jsig.promises.sign(testDocument, {
  privateKeyPem: testPrivateKeyPem,
  creator: 'https://example.com/i/alice/keys/1'
});
sign.then(function(signedDocument) {...}, function(err) {...});

var verify = jsig.promises.verify(signedDocument, {
  publicKey: testPublicKey,
  publicKeyOwner: testPublicKeyOwner
});
verify.then(function(verified) {...}, function(err) {...});

Commercial Support

Commercial support for this library is available upon request from Digital Bazaar: [email protected]

Source

The source code for the JavaScript implementation of the JSON-LD Signatures API is available at:

https://github.com/digitalbazaar/jsonld-signatures

Tests

This library includes a sample testing utility which may be used to verify that changes to the processor maintain the correct output.

To run the sample tests you will need to get the test suite files by cloning the jsonld-signatures repository hosted on GitHub.

https://github.com/digitalbazaar/jsonld-signatures/

Run the tests using the following command:

npm run test

The standard tests will run node and browser tests. Just one type can also be run:

npm run test-node
npm run test-browser

Code coverage of node tests can be generated in coverage/:

npm run coverage