@digitalcredentials/x25519-key-agreement-key-2020

3.0.0 • Public • Published

X25519KeyAgreementKey2020 (@digitalcredentials/x25519-key-agreement-key-2020)

NPM Version

An X25519 (Curve25519) DH (Diffie-Hellman) key implementation to work with the X25519 2020 Crypto suite.

Table of Contents

Security

TBD

Background

(Forked from digitalbazaar/x25519-key-agreement-key-2020 v2.0.0 to provide TypeScript compatibility.)

For use with crypto-ld >= 5.0.

To actually perform encryption with those keys, we recommend you use the minimal-cipher library.

This is a low-level level library to generate and serialize X25519 (Curve25519) key pairs (uses nacl.box under the hood).

See also (related specs):

Install

Requires Node.js 12+

To install locally (for development):

git clone https://github.com/digitalcredentials/x25519-key-agreement-key-2020.git
cd x25519-key-agreement-key-2020
npm install

Usage

Importing:

const {X25519KeyAgreementKey2020} = require('@digitalcredentials/x25519-key-agreement-key-2020');

// Or, if you're testing code in the interactive Node CLI, right in this repo:
const {X25519KeyAgreementKey2020} = require('./');

Generating:

const keyPair = await X25519KeyAgreementKey2020.generate({
  controller: 'did:example:1234'
});
// ->
{
  "id": "did:example:1234#z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "controller": "did:example:1234",
  "type": "X25519KeyAgreementKey2020",
  "publicKeyMultibase": "z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "privateKeyMultibase": "z3weeMD56C1T347EmB6kYNS7trpQwjvtQCpCYRpqGz6mcemT"
}

Serializing just the public key:

keyPair.export({publicKey: true});
// ->
{
  "id": "did:example:1234#z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "controller": "did:example:1234",
  "type": "X25519KeyAgreementKey2020",
  "publicKeyMultibase": "z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM"
}

Serializing both the private and public key:

// a different key pair than the previous example
await keyPair.export({publicKey: true, privateKey: true})
// ->
{
  "id": "did:example:1234#z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "controller": "did:example:1234",
  "type": "X25519KeyAgreementKey2020",
  "publicKeyMultibase": "z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "privateKeyMultibase": "z3weeMD56C1T347EmB6kYNS7trpQwjvtQCpCYRpqGz6mcemT"
}

Deserializing:

// Loading public key only
const keyPair = await X25519KeyAgreementKey2020.from({
  "id": "did:example:1234#z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM",
  "controller": "did:example:1234",
  "type": "X25519KeyAgreementKey2020",
  "publicKeyMultibase": "z6LSeRSE5Em5oJpwdk3NBaLVERBS332ULC7EQq5EtMsmXhsM"
});

Contribute

See the contribute file!

PRs accepted.

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

License

  • MIT License - DCC - TypeScript compatibility.
  • New BSD License (3-clause) © 2020-2021 Digital Bazaar - Initial implementation.

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Install

npm i @digitalcredentials/x25519-key-agreement-key-2020

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Collaborators

  • kezike
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  • kimhd
  • uligall
  • alexander.muehle
  • stuartf
  • jchartrand
  • kiliankae