sdk-monorepo/test/crypto.test.ts

import chai from 'chai'

import { solidity } from 'ethereum-waffle'
import { BigNumber } from 'ethers'
import { Primitives } from '@tornado/sdk-crypto'

chai.use(solidity)

const expect = chai.expect

describe('crypto', () => {
  describe('namespace Crypto', () => {
    describe('namespace Primitives', () => {
      it('createDeposit', () => {
        const deposit = Primitives.createDeposit()
        // @ts-ignore
        const limit = BigNumber.from(2).pow(248).sub(1)

        expect(deposit.nullifier).to.exist
        expect(deposit.secret).to.exist
        expect(deposit.preimage).to.exist
        expect(deposit.commitment).to.exist
        expect(deposit.hexCommitment).to.exist
        expect(deposit.hexNullifierHash).to.exist

        // From the whitepaper, the nullifier k E B^248
        expect(BigNumber.from(deposit.nullifier.toString())).to.be.lte(limit)
        // From the whitepaper, the randomness r E B^248
        expect(BigNumber.from(deposit.secret.toString())).to.be.lte(limit)
      })

      it('parseNote', () => {
        const deposit = Primitives.createDeposit()
        const note = Primitives.createNote(deposit.preimage)
        const parsed = Primitives.parseNote(note)
        expect(parsed.hexCommitment).to.equal(deposit.hexCommitment)
      })
    })
  })
})