js-libp2p-crypto/test/ephemeral-keys.spec.js

/* eslint-env mocha */
'use strict'

const expect = require('chai').expect
const EC = require('elliptic').ec

const crypto = require('../src')
const fixtures = require('./fixtures/go-elliptic-key')

describe('generateEphemeralKeyPair', () => {
  it('returns a function that generates a shared secret', () => {
    const res = crypto.generateEphemeralKeyPair('P-256')
    const ourPublic = '044374add0df35706db7dade25f3959fc051d2ef5166f8a6a0aa632d0ab41cdb4d30e1a064e121ac56155235a6b8d4c5d8fe35e019f507f4e2ff1445e229d7af43'

    expect(
      res.genSharedKey(ourPublic)
    ).to.have.length(32)

    expect(
      res.key
    ).to.exist
  })

  describe('go interop', () => {
    it('generates a shared secret', () => {
      const curve = fixtures.curve
      const ec = new EC(fixtures.curveJs)
      const bobPrivate = ec.keyFromPrivate(fixtures.bob.private, 'binary')

      const alice = crypto.generateEphemeralKeyPair(curve)
      const bob = {
        key: fixtures.bob.public,
        // this is using bobs private key from go ipfs
        // instead of alices
        genSharedKey: (key) => alice.genSharedKey(key, bobPrivate)
      }

      const s1 = alice.genSharedKey(bob.key)
      const s2 = bob.genSharedKey(alice.key)

      expect(s1.equals(s2)).to.be.eql(true)
    })
  })
})