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111 lines
2.8 KiB
111 lines
2.8 KiB
/*!
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* lib/bitcoin/addresses-helper.js
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* Copyright © 2019 – Katana Cryptographic Ltd. All Rights Reserved.
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*/
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'use strict'
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const bitcoin = require('bitcoinjs-lib')
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const btcMessage = require('bitcoinjs-message')
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const activeNet = require('./network').network
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const { p2pkh, p2sh, p2wpkh } = bitcoin.payments
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/**
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* A singleton providing Addresses helper functions
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*/
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class AddressesHelper {
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/**
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* Derives a P2PKH from a public key
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* @param {Buffer} pubKeyBuffer - Buffer storing a public key
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* @returns {string} return the derived address
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*/
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p2pkhAddress(pubKeyBuffer) {
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return p2pkh({
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pubkey: pubKeyBuffer,
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network: activeNet,
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}).address
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}
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/**
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* Derives a P2WPKH-P2SH from a public key
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* @param {Buffer} pubKeyBuffer - Buffer storing a public key
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* @returns {string} return the derived address
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*/
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p2wpkhP2shAddress(pubKeyBuffer) {
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return p2sh({
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redeem: p2wpkh({
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pubkey: pubKeyBuffer,
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network: activeNet,
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}),
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network: activeNet,
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}).address
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}
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/**
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* Derives a P2WPKH from a public key
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* @param {Buffer} pubKeyBuffer - Buffer storing a public key
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* @returns {string} return the derived address
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*/
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p2wpkhAddress(pubKeyBuffer) {
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return p2wpkh({
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pubkey: pubKeyBuffer,
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network: activeNet,
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}).address.toLowerCase()
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}
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/**
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* Verify the signature of a given message
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* @param {string} msg - signed message
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* @param {string} address - address used to sign the message
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* @param {string} sig - signature of the message
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* @returns {boolean} retuns true if signature is valid, otherwise false
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*/
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verifySignature(msg, address, sig) {
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try {
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const prefix = activeNet.messagePrefix
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return btcMessage.verify(msg, prefix, address, sig)
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} catch(e) {
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return false
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}
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}
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/**
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* Checks if a string seems like a supported pubkey
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* @param {string} str - string
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* @returns {boolean} return true if str is a supported pubkey format, false otherwise
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*/
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isSupportedPubKey(str) {
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return (str.length == 66 && (str.startsWith('02') || str.startsWith('03')))
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}
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/**
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* Check if string is a Bech32 address
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* @param {string} str - string to be checked
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* @returns {boolean} return true if str is a Bech32 address, false otherwise
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*/
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isBech32(str) {
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try {
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bitcoin.address.fromBech32(str)
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return true
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} catch(e) {
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return false
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}
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}
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/**
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* Get the script hash associated to a Bech32 address
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* @param {string} str - bech32 address
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* @returns {string} script hash in hex format
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*/
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getScriptHashFromBech32(str) {
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try {
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return bitcoin.address.fromBech32(str).data.toString('hex')
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} catch(e) {
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Logger.error(e, 'AddressesHelper : getScriptHashFromBech32()')
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return null
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}
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}
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}
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module.exports = new AddressesHelper()
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