102 lines
2.9 KiB
JavaScript
102 lines
2.9 KiB
JavaScript
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import crypto from 'crypto'
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import { BN, toBN } from 'web3-utils'
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import { pedersen } from '@/services'
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const CUT_LENGTH = 31
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export function parseNote(note) {
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const [, currency, amount, netId, hexNote] = note.split('-')
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return {
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...parseHexNote(hexNote),
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netId,
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amount,
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currency
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}
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}
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export function parseHexNote(hexNote) {
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const buffNote = Buffer.from(hexNote.slice(2), 'hex')
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const commitment = buffPedersenHash(buffNote)
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const nullifierBuff = buffNote.slice(0, CUT_LENGTH)
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const nullifierHash = BigInt(buffPedersenHash(nullifierBuff))
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const nullifier = BigInt(leInt2Buff(buffNote.slice(0, CUT_LENGTH)))
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const secret = BigInt(leInt2Buff(buffNote.slice(CUT_LENGTH, CUT_LENGTH * 2)))
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return {
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secret,
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nullifier,
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commitment,
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nullifierBuff,
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nullifierHash,
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commitmentHex: toFixedHex(commitment),
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nullifierHex: toFixedHex(nullifierHash)
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}
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}
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export function leInt2Buff(value) {
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return new BN(value, 16, 'le')
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}
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export function randomBN(nbytes = 31) {
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return toBN(leInt2Buff(crypto.randomBytes(nbytes)).toString())
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}
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export function buffPedersenHash(buffer) {
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const [hash] = pedersen.unpackPoint(buffer)
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return pedersen.toStringBuffer(hash)
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}
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export function toFixedHex(value, length = 32) {
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const isBuffer = value instanceof Buffer
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const str = isBuffer ? value.toString('hex') : BigInt(value).toString(16)
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return '0x' + str.padStart(length * 2, '0')
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}
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export const isEmptyArray = (arr) => !Array.isArray(arr) || !arr.length
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export function packEncryptedMessage(encryptedMessage) {
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const nonceBuf = Buffer.from(encryptedMessage.nonce, 'base64')
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const ephemPublicKeyBuf = Buffer.from(encryptedMessage.ephemPublicKey, 'base64')
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const ciphertextBuf = Buffer.from(encryptedMessage.ciphertext, 'base64')
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const messageBuff = Buffer.concat([
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Buffer.alloc(24 - nonceBuf.length),
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nonceBuf,
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Buffer.alloc(32 - ephemPublicKeyBuf.length),
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ephemPublicKeyBuf,
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ciphertextBuf
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])
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return '0x' + messageBuff.toString('hex')
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}
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export function unpackEncryptedMessage(encryptedMessage) {
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if (encryptedMessage.slice(0, 2) === '0x') {
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encryptedMessage = encryptedMessage.slice(2)
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}
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const messageBuff = Buffer.from(encryptedMessage, 'hex')
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const nonceBuf = messageBuff.slice(0, 24)
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const ephemPublicKeyBuf = messageBuff.slice(24, 56)
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const ciphertextBuf = messageBuff.slice(56)
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return {
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version: 'x25519-xsalsa20-poly1305',
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nonce: nonceBuf.toString('base64'),
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ephemPublicKey: ephemPublicKeyBuf.toString('base64'),
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ciphertext: ciphertextBuf.toString('base64')
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}
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}
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export function checkCommitments(events = []) {
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events.forEach(({ leafIndex }, i) => {
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// TODO reload events, need for if infura provider missing events
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if (leafIndex !== i) {
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console.error(`Missing deposit event for deposit #${i}`)
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throw new Error(window.$nuxt.$t('failedToFetchAllDepositEvents'))
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}
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})
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}
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