Node.js crypto create Sign/Verify RSA-SHA256

var crypto = require("crypto"),
    fs = require("fs");

var signer, sign, verifier, privateKey, publicKey, result;

privateKey = fs.readFileSync("mykey.pem", "utf8");
publicKey = fs.readFileSync("mypub.pem", "utf8");

signer = crypto.createSign("RSA-SHA256");
signer.update("hello world!");
signer.update("hello node!");
sign = signer.sign(privateKey, "hex");
console.log(sign);//from  w ww . j  a  va  2  s.  c  om

verifier = crypto.createVerify("RSA-SHA256");
verifier.update("hello world!");
verifier.update("hello node!");
result = verifier.verify(publicKey, sign, "hex");
console.log(result);//true