gistfile1.txt

const EthCrypto = require('eth-crypto');
const bip39 = require('bip39');
const hdkey = require('hdkey');
const ethUtil = require('ethereumjs-util');

async function main(){
    const mnemonic = bip39.generateMnemonic();
    const root = hdkey.fromMasterSeed(mnemonic);

    const masterPrivateKey = root.privateKey.toString('hex');
    const masterPubKey = root.publicKey.toString('hex');

    var path = "m/44'/60'/0'/0/0";
    const addrNode = root.derive(path)
    const pubKey = addrNode.publicKey.toString('hex');
    const privateKey = addrNode.privateKey.toString('hex');

    const msg = "thisissecret";

    const encrypt = await EthCrypto.encryptWithPublicKey(pubKey,msg);
    const decrypt = await EthCrypto.decryptWithPrivateKey(masterPrivateKey,encrypt);
    console.log(decrypt);
}
main();