Installation

from npm

from git

git clone git@github.com:cryptocoinjs/secp256k1-node.gitcd secp256k1-nodegit submodule update --initnpm install

Windows

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

Usage

Private Key generation, Public Key creation, signature creation, signature verification

const{ randomBytes}=require('crypto')constsecp256k1=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)`constmsg=randomBytes(32)// generate privKeyletprivKeydo{privKey=randomBytes(32)}while(!secp256k1.privateKeyVerify(privKey))// get the public key in a compressed formatconstpubKey=secp256k1.publicKeyCreate(privKey)// sign the messageconstsigObj=secp256k1.ecdsaSign(msg,privKey)// verify the signatureconsole.log(secp256k1.ecdsaVerify(sigObj.signature,msg,pubKey))// => true

Get X point of ECDH

const{ randomBytes}=require('crypto')// const secp256k1 = require('./elliptic')constsecp256k1=require('./')// generate privKeyfunctiongetPrivateKey(){while(true){constprivKey=randomBytes(32)if(secp256k1.privateKeyVerify(privKey))returnprivKey}}// generate private and public keysconstprivKey=getPrivateKey()constpubKey=secp256k1.publicKeyCreate(privKey)// compressed public key from X and Yfunctionhashfn(x,y){constpubKey=newUint8Array(33)pubKey[0]=(y[31]&1)===0 ?0x02 :0x03pubKey.set(x,1)returnpubKey}// get X point of ecdhconstecdhPointX=secp256k1.ecdh(pubKey,privKey,{ hashfn},Buffer.alloc(33))console.log(ecdhPointX.toString('hex'))

LICENSE