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Node.js binding for an Optimized C library for EC operations on curve secp256k1
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README.md

secp256k1-node

This module provides native bindings to bitcoin-core/secp256k1. In browser elliptic will be used as fallback.

Works on node version 10.0.0 or greater, because use N-API.

Installation

from npm

npm install secp256k1

from git
git clone git@github.com:cryptocoinjs/secp256k1-node.git
cd secp256k1-node
git submodule update --init
npm install
Windows

The easiest way to build the package on windows is to install windows-build-tools.

Or install the following software:

And run commands:

npm config set msvs_version 2015 --global
npm install npm@next -g

Based on:

Usage

Private Key generation, Public Key creation, signature creation, signature verification
const { randomBytes } = require('crypto')
const secp256k1 = require('secp256k1')
// or require('secp256k1/elliptic')
//   if you want to use pure js implementation in node

// generate message to sign
// message should have 32-byte length, if you have some other length you can hash message
// for example `msg = sha256(rawMessage)`
const msg = randomBytes(32)

// generate privKey
let privKey
do {
  privKey = randomBytes(32)
} while (!secp256k1.privateKeyVerify(privKey))

// get the public key in a compressed format
const pubKey = secp256k1.publicKeyCreate(privKey)

// sign the message
const sigObj = secp256k1.ecdsaSign(msg, privKey)

// verify the signature
console.log(secp256k1.ecdsaVerify(sigObj.signature, msg, pubKey))
// => true

* .verify return false for high signatures

Get X point of ECDH
const { randomBytes } = require('crypto')
// const secp256k1 = require('./elliptic')
const secp256k1 = require('./')

// generate privKey
function getPrivateKey () {
  while (true) {
    const privKey = randomBytes(32)
    if (secp256k1.privateKeyVerify(privKey)) return privKey
  }
}

// generate private and public keys
const privKey = getPrivateKey()
const pubKey = secp256k1.publicKeyCreate(getPrivateKey())

// compressed public key from X and Y
function hashfn (x, y) {
  const pubKey = new Uint8Array(33)
  pubKey[0] = (y[31] & 1) === 0 ? 0x02 : 0x03
  pubKey.set(x, 1)
  return pubKey
}

// get X point of ecdh
const ecdhPointX = secp256k1.ecdh(pubKey, privKey, { hashfn }, Buffer.alloc(33))
console.log(ecdhPointX.toString('hex'))

LICENSE

This library is free and open-source software released under the MIT license.

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