Ed25519VerificationKey2018 Key Pair Library for Linked Data (@digitalbazaar/ed25519-verification-key-2018)

Javascript library for generating and working with Ed25519VerificationKey2018 key pairs, for use with crypto-ld.

Table of Contents

• Background
• Security
• Install
• Usage
• Contribute
• Commercial Support
• License

Background

See also (related specs):

• Linked Data Cryptographic Suite Registry

Security

As with most security- and cryptography-related tools, the overall security of your system will largely depend on your design decisions.

Install

• Node.js 14+ is required.

To install locally (for development):

git clone https://github.com/digitalbazaar/ed25519-verification-key-2018.git
cd ed25519-verification-key-2018
npm install

Usage

Generating a new public/private key pair

To generate a new public/private key pair:

• {string} [controller] Optional controller URI or DID to initialize the generated key. (This will also init the key id.)
• {string} [seed] Optional deterministic seed value from which to generate the key.

import {Ed25519VerificationKey2018} from '@digitalbazaar/ed25519-verification-key-2018';

const edKeyPair = await Ed25519VerificationKey2018.generate();

Importing a key pair from storage

To create an instance of a public/private key pair from data imported from storage, use .from():

const serializedKeyPair = { ... };

const keyPair = await Ed25519VerificationKey2018.from(serializedKeyPair);

Note that only installed key types are supported, if you try to create a key pair via from() for an unsupported type, an error will be thrown.

Exporting the public key only

To export just the public key of a pair:

await keyPair.export({publicKey: true});
// ->
{ 
  id: 'did:ex:123#z6MkumafR1duPR5FZgbVu8nzX3VyhULoXNpq9rpjhfaiMQmx',
  controller: 'did:ex:123',
  type: 'Ed25519VerificationKey2018',
  publicKeyBase58: 'GKKcpmPU3sanTBkoDZq9fwwysu4x7VaUTquosPchSBza'
}
*/

Exporting the full public-private key pair

To export the full key pair, including private key (warning: this should be a carefully considered operation, best left to dedicated Key Management Systems):

await keyPair.export({publicKey: true, privateKey: true});
// ->
{
  id: 'did:ex:123#z6Mks8wJbzhWdmkQZgw7z2qHwaxPVnFsFmEZSXzGkLkvhMvL',
  controller: 'did:ex:123',
  type: 'Ed25519VerificationKey2018',
  publicKeyBase58: 'DggG1kT5JEFwTC6RJTsT6VQPgCz1qszCkX5Lv4nun98x',
  privateKeyBase58: 'sSicNq6YBSzafzYDAcuduRmdHtnrZRJ7CbvjzdQhC45ewwvQeuqbM2dNwS9RCf6buUJGu6N3rBy6oLSpMwha8tc'
}

Generating and verifying key fingerprint

To generate a fingerprint:

keyPair.fingerprint();
// ->
'z6Mks8wJbzhWdmkQZgw7z2qHwaxPVnFsFmEZSXzGkLkvhMvL'

To verify a fingerprint:

const fingerprint = 'z6Mks8wJbzhWdmkQZgw7z2qHwaxPVnFsFmEZSXzGkLkvhMvL';
keyPair.verifyFingerprint({fingerprint});
// ->
{ valid: true }

Creating a signer function

In order to perform a cryptographic signature, you need to create a sign function, and then invoke it.

const keyPair = Ed25519VerificationKey2018.generate();

const {sign} = keyPair.signer();

const data = 'test data to sign';
const signatureValue = await sign({data});

Creating a verifier function

In order to verify a cryptographic signature, you need to create a verify function, and then invoke it (passing it the data to verify, and the signature).

const keyPair = Ed25519VerificationKey2018.generate();

const {verify} = keyPair.verifier();

const {valid} = await verify({data, signature});

Contribute

See the contribute file!

PRs accepted.

If editing the Readme, please conform to the standard-readme specification.

Commercial Support

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

License

New BSD License (3-clause) © Digital Bazaar