CryptoJS WordArray add integer. Resources used: * http://code.google.com/p/crypto-js/ * https://github.com/jtobey/javascript-bignum/ JSFiddle is here: http://jsfiddle.net/joscha/B2heY/

gistfile1.js

var hash = CryptoJS.HmacSHA1("Message", "Secret Passphrase");
var hashPlusOne = CryptoJS.enc.Hex.parse(BigInteger.parse(hash.toString(),16).add(1).toString(16));
console.log(hash.toString(),hashPlusOne.toString());