GitHub - cryptocoinjs/secp256k1-node: Node.js binding for an Optimized C library for EC operations on curve secp256k1 (original) (raw)

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

Works on node version 14.0.0 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:

• Git: https://git-scm.com/download/win
• nvm: https://github.com/coreybutler/nvm-windows
• Python 2.7: https://www.python.org/downloads/release/python-2712/
• Visual C++ Build Tools: http://landinghub.visualstudio.com/visual-cpp-build-tools (Custom Install, and select both Windows 8.1 and Windows 10 SDKs)

And run commands:

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

Based on:

• nodejs/node-gyp#629 (comment)
• nodejs/node-gyp#972

Usage

• API Reference (v4.x) (current version)
• API Reference (v3.x)
• API Reference (v2.x)

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(privKey)

// 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.